Bölüm "İstanbul Medipol Üniversitesi, Diş Hekimliği Fakültesi, Protetik Diş Tedavisi Ana Bilim Dalı" seçeneğine göre listele
Listeleniyor 1 - 20 / 120
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe 3D-printed resin composite posterior fixed dental prosthesis: a prospective clinical trial up to 1 year(2024) Hobbi, Paniz; Ordueri, Tuğçe Merve; Öztürk Bozkurt, Funda; Toz Akalın, Tuğba; Ateş, Muzaffer; Özcan, MutluObjectives: This clinical trial evaluated the clinical behavior of 3D-printed posterior resin composite fixed dental prostheses (FDPs). Materials and methods: Between 10 October 2020 and 5 August 2022, 49 patients aged 19–60 years (16 men, 33 women) received 68 3D-printed resin composite 3-unit posterior FDPs (ELS Even Stronger, Saremco, Switzerland). FDPs were followed up 2 weeks after placement (baseline), 6 months after placement, and 1 year after placement by two independent calibrated observers using modified FDI criteria for anatomical form, secondary caries, marginal adaptation, surface roughness, color match, fracture of material, staining surface, staining margin, approximate anatomical form, retention, gingival health, and patient's view. Survival analyses were performed using Kaplan–Meier analyses. Results: A total of 59 restorations were evaluated and the mean observation period was 8.63 months. Failure types were categorized as mechanical and biological. Failures were observed in 14 FDPs. Nine FDPs showed mechanical failure and five FDPs showed biological failure. Mechanical failures were mostly experienced as connector fractures. Eight FDPs showed cohesive fractures (seven in a single connector at either at the mesial or distal and one in the pontic itself). Biological failures, including root canal treatment and gingival tissue reactions, were observed within the first 6 months. Based on mechanical failures, the survival rate was 86.7% including the biological complications; this corresponded to 71.6% (Kaplan–Meier). After 1 year, two FDPs showed surface luster loss (score 4), two-color mismatches (score 4), and two-surface staining (score 4). Conclusion: 3D-printed resin composite FDPs were observed acceptable after 1 year of clinical follow-up, providing that the experienced failure types were mainly associated with fractures in the connector region, which requires revision of design parameters.Öğe A modified technique for extraoral cementation of implant retained restorations for preventing excess cement around the margins(Korean Academy of Prosthodontics, 2014) Yüzbaşıoğlu, EmirThe major drawback of cement-retained restorations is the extrusion of the excess cement into the peri-implant sulcus, with subsequent complications. Insufficient removal of the excess cement may initiate a local inflammatory process, which may lead to implant failure. This article presents a method of controlling cement flow on implant abutments, minimizing the excess cement around implant-retained restorations.Öğe Activation of matrix-bound endogenous proteases by self-etch adhesives(NLM (Medline), 2020) Oğuz Ahmet, Bebek Serra; Şeşeoğulları Dirihan, Roda; Tezvergil Mutluay, ArzuThe study evaluated changes in total enzymatic activity and degradation of demineralized dentin following the application of universal or self-etch adhesives. The universal adhesives -Scotchbond Universal (SU) and All-Bond Universal (ABU) and self-etch adhesives -Adper Easy Bond (EB) and G-aenial Bond (GB) were used for 2 min pretreatment of the dentin beams. Phosphoric acid (PA) treatment as well as no treatment served as controls. Total enzymatic activity was analyzed before and after treatment, collagen degradation was assessed using mass loss, C-terminal telopeptide (CTX) and C-terminal-telopeptide of type I collagen (ICTP) release (24 h, 3-day, 3-week). Over three weeks of incubation, ICTP release of ABU treated beams was significantly higher than other groups (p<0.05), except for SU treated beams (p>0.05) and CTX release of GB treated beams was the highest among the groups with statistically significant difference (p<0.05). The results confirm that the universal adhesives tested have also potential to increase the enzymatic activity in dentin.Öğe Addition of benzalkonium chloride to self-adhesive resin-cements: Some clinically relevant properties(Informa Healthcare, 2014) Oğuz Ahmet, Serra; Mutluay, Mustafa Murat; Seyfio?lu Polat, Zelal; Seseoğulları-Dirihan, Roda; Bek, Bülent; Tezvergil-Mutluay, ArzuOBJECTIVE: The clinical survival rates of the adhesive restorations are limited due to the deterioration of resin-dentin bonds over time, partly due to the endogenous enzymatic activity of dentin. Recently, benzalkonium chloride (BAC) has been shown to effectively inhibit endogenous protease activity of dentin. This study evaluated the effect of different concentrations of benzalkonium chloride (BAC) on the degree of conversion (DC), vickers hardness (VH), setting time (ST) and biaxial flexural strength (FS) of two self-adhesive resin luting cements (RC).METHODS: Two RC SpeedCEM (Ivoclar-Vivadent) and BisCem (Bisco) were modified by addition of 0.1, 0.5, 1, 1.5, 2 wt% BAC. The luting cements without the addition of BAC served as control. The DC (FT-IR/ATR from the bottom of the resin disc), vickers hardness (from top and bottom of the light-cured specimen), setting time (ISO 4049) and biaxial flexural strength (0.6 × 6 mm discs) of the specimens were tested. Data were analyzed using ANOVA and Tukeys HSD.RESULTS: DC results were in the range of 70-80%, with some significant changes in BisCem (p < 0.05). VH values of both materials increased significantly compared to control, with no significant change as the BAC percentage increases. BAC addition influenced the ST differently for both materials. For BisCem, a gradual decrease (p < 0.05) was observed whereas, for SpeedCEM, a gradual increase was observed until 1% BAC (p < 0.05). For FS values, a gradual decrease was observed for both materials with increased amounts of BAC (p < 0.05), compared to the control group.CONCLUSIONS: BAC addition of up to 1% seems to be acceptable considering the properties tested. Clinical significance. Incorporation of benzalkonium chloride to self-adhesive resin luting cements during the mixing procedure does not significantly affect the degree of conversion or flexural strength of the luting agent and may be a good option to improve the durability of adhesive interface.Öğe Adhesion of orthodontic brackets to indirect laboratory-processed resin composite as a function of surface conditioning methods and artificial aging(Taylor & Francis Ltd, 2016) Yüzbaşıoğlu, Emir; Sayar Torun, Gülsilay; Özcan, MutluThis study compared the shear bond strength of orthodontic brackets to laboratory-processed indirect resin composites (IRC) after different surface conditioning methods and aging. Specimens made of IRC (Gradia Indirect, GC) (thickness: 2 mm; diameter: 10 mm) (N = 80) were randomly assigned to one of the following surface conditioning methods: C-Control: no treatment; AA - Air-abrasion (50 mu m Al2O3 particles); DB-Diamond bur and HF - Etching with hydrofluoric acid (9.6%). After adhesive primer application (Transbond XT), orthodontic brackets were bonded to the conditioned IRC specimens using adhesive resin (Transbond XT). Following storage in artificial saliva for 24 h at 37 degrees C, the specimens were thermocycled (x1000, 5-55 degrees C). The IRC-bracket interface was loaded under shear in a Universal Testing Machine (0.5 mm/min). Failure types were classified using modified adhesive remnant index criteria. Data were analyzed using two-way ANOVA and Tukey's HSD (alpha = 0.05). Surface conditioning method did not significantly affect the bond strength results (p = 0.2020), but aging significantly decreased the results (p = 0.04). Interaction terms were not significant (p = 0.775). In both non-aged and aged conditions, non-conditioned C group presented the lowest bond strength results (MPa) (p < 0.05). In non-aged conditions, surface conditioning with DB (8.03 +/- 0.77) and HF (7.87 +/- 0.64) showed significantly higher bond strength results compared to those of other groups (p < 0.05). Thermocycling significantly decreased the mean bond strength in all groups (2.24 +/- 0.36-6.21 +/- 0.59) (p < 0.05). The incidence of Score 5 (all adhesive resin remaining on the specimen) was the highest in HF group without (80%) and with aging (80%) followed by DB (40, 70%, respectively). C groups without and with aging showed exclusively Score 1 type (no adhesive resin on the specimen) of failures indicating the least reliable type of adhesion.Öğe Aesthetic repair of zirconia-supported porcelain prosthesis with ceramic veneer, case report with 3-year follow-up(Premchand Shantidevi Research Foundation, 2021) Ordueri, Tuğçe Merve; Kaptanoğlu, Asena; Ateş, Mehmet MuzafferChipping is the most common complication in zirconia-supported porcelain prosthesis. If the prosthesis has ideal adaptation and there is no problem other than chipping, intraoral repair is the most practical solution for such failures. Composite resins are often preferred for intraoral porcelain repair. However, the wear and unstable colour of composite resins negatively affect aesthetics. This complication could be restored intraorally and aesthetically with ceramic veneer. This case report presents the intraoral repair of a zirconia supported Fixed Partial Denture (FPD) consisting of four units. The cohesive fracture of the ceramic material in the incisal part of maxillary right central incisor was restored with ceramic veneers. Preparation was done with a tapered, rounded end diamond bur under water-cooling. The impression was taken with elastomeric impression material. Ceramic veneer was manufactured with a leucite-reinforced glass-ceramic and cemented with light cure resin cement. Based on the three-year follow up of the performed intraoral repair, ceramic veneers have shown to be an alternative treatment for fractured FPD.Öğe Alternative prosthodontic rehabilitation of traumatic patients with tooth, bone and soft tissue loss: Two clinical reports(2018) Sayın Özel, Gülsüm; İnan, Özgür; Dolanmaz, DoğanAcquired defects typically result from traumatic injuries such as falls, motor vehicle accidents, gunshot injuries or radiation injuries. Those maxillofacial defects resulting from motor vehicle accidents in particular often involve various soft and hard-tissue injuries such as fractures or avulsions of the maxillary or mandibular teeth or fractures of the temporomandibular joints. For a patient suffering such injuries, the retention and stabilization of a prosthesis that contributes to the patient's physical and psychological well-being are often difficult to achieve due to the nature of the moveable tissue beds involved and the resulting lack of support from the remaining teeth and bones. This clinical report describes the treatments of two partially edentulous patients with traumatic injuries that resulted from motor vehicle accidents. The prosthetic rehabilitations were accomplished through the manufacture of (1) a mandibular prosthesis with an extracoronal bar attachment, and (2) a maxillary implant-supported removable prosthesis.Öğe Analysis of satisfaction levels in completely edentulous patients treated with different configurations of implant-supported prostheses(2024) Demir, Esin; Özel, Gülsüm; İnan, Özgür; Dolanmaz, DoğanPurpose: To evaluate and compare patient satisfaction levels in edentulous patients treated with different configurations of implant-supported prostheses as well as previous prosthesis experiences before implant treatment. Materials and Methods: A study population of 142 patients was identified and separated into four treatment groups: group 1 comprised 43 patients treated with an implant-supported overdenture in the mandible and conventional complete denture in the maxilla; group 2 comprised 32 patients treated with implant-supported overdentures in the maxilla and mandible; group 3 comprised 26 patients treated with an implant-supported overdenture in the mandible and a fixed prosthesis in the maxilla; and group 4 comprised 41 patients treated with implant-supported maxillomandibular fixed restorations. Questionnaires asking about masticatory performance, pronunciation, comfort, and social ability were used to evaluate treatment outcomes. Results: The patients in group 4 were significantly more satisfied regarding masticatory performance than other treatment modalities. Visual analog scale (VAS) scores for comfort and social ability were similar in groups 3 and 4 and significantly higher than those in groups 1 and 2. The patients who used a conventional removable prosthesis before implant treatment were more satisfied with their implant-supported prosthesis regarding social ability (P =.03). Conclusions: The treatment design of an implant-supported fixed prosthesis in the maxilla and implant overdenture in the mandible provided a comparable level of satisfaction with maxillomandibular fixed prosthesis for edentulous patients. This combination served as a practical solution especially for patients with mandibular atrophy who would require extensive surgeries to support maxillomandibular fixed prostheses. In the maxilla, patient satisfaction with an implant-supported overdenture was not superior to that with a conventional prosthesis. Note that previous removable prosthesis experience may influence social comfort for patients. Int J Oral Maxillofac Implants 2024;39:776–782. doi: 10.11607/jomi.10734Öğe Assessment of hygiene habits and attitudes among removable partial denture wearers in a university hospital(Medknow Publications, 2015) Çakan, Umut; Yüzbaşıoğlu, Emir; Kurt, Hanefi; Kara, Haluk; Turunç, Rana; Akbulut, Aslıhan; Aydın, KaderAims: The aim of this study was conducting a survey of hygiene habits and use of removable partial dentures (RPDs) and correlate them with the social conditions of the interviewees. Methods: A total of 145 RPD wearers were interviewed by experienced clinical staff using a structured questionnaire. A Chi-squared test was performed to evaluate statistical significance between the variables, and the level of significance was P < 0.05. Results: A total of 72 (49%) patients reported that they had not been well informed by the dentists. Brushing was the most frequent cleaning method (57.6%). 77 (53.1%) patients did not take off their dentures at night. The frequency of cleaning dentures and using cleansing tablet was significantly higher in females than in males (P < 0.05). The frequency of denture cleaning, cleaned parts of denture, use of cleansing tablet, removal of dentures at night, frequency of tooth brushing, does not show any significant difference according to age, educational status or duration of denture usage (P > 0.05). RPD wearers did not clean their dentures and natural teeth satisfactorily and had limited knowledge of denture cleansing and oral hygiene maintenance. Conclusions: Hygiene habits and attitudes may be affected by gender, but education level and hygiene attitudes may not always present positive correlation. Dentists should thoroughly inform patients about the harmful effects of overnight wearing and motivate to clean metal parts of RPD's and cleansing tablet use in order to minimize the abrasive effect of widely preferred cleaning method of brushing with toothpaste.Öğe Assessment of intra-oral repair systems for veneered zirconia and zirconia only(MDPI, 2023) Ordueri, Tuğçe Merve; Ateş, Mehmet Muzaffer; Özcan, MutluThe aim of this study was to compare bond strength resin composites to porcelain laminate veneers in the indirect repair method to composite resins used in the direct repair method for cases of porcelain veneer fracture of zirconia-based fixed dental prostheses. In the study, the groups were formed with different percentages of areas to be repaired to mimic porcelain fractures in the mouth. The experimental group of veneered zirconia were as follows: Group A = 100% Zr surface; Group B = 70% Zr, 30% porcelain surface; Group C = 50% Zr, 50% porcelain surface; Group D = 30% Zr, 70% porcelain surface; Group E = 100% porcelain surface. The repairs of the specimens were made using composite resin systems in half of the groups and using porcelain laminate veneers in the other half. Specimens were embedded in acrylic blocks before surface treatments and repairs were applied. After surface conditioning, laminate veneers were applied to the first half of the groups, and composite repair systems were applied to the second half of the groups. After all specimens were aged by thermal cycling, their bond strength values were measured using a Universal Testing Machine, and the obtained data were recorded. The specimens were examined with a stereomicroscope and classified according to failure types (adhesive/cohesive/mixed). Bond strength values were evaluated based on independent-samples t-test statistics. According to the comparisons among the groups, the bond strength of the indirect repairs made with the laminate material was higher than the bond strength of the repairs made with the composite. There was a statistically significant difference in favor of the indirect repair groups among all groups except for Group C. The highest bond strength was found in Group A in the indirect repair method, while the lowest bond was found in the direct repair method in Group E. Adhesive failure was mostly seen in the groups that were repaired with the composite.Öğe Atomic force microscopy investigation of lithium disilicate glass ceramic after various surface treatments(Maney Publishing, 2014) Kara, Haluk Barış; Kara, Özlem; Sayın Özel, Gülsüm; Çakan, Umut; Öztürk, Atiye NilgünThe aim of this study is to evaluate the influence of various surface treatments on the surface roughness of a lithium disilicate glass ceramic. A total of 25 discs of lithium disilicate glass ceramic were prepared. Specimens were divided into five groups: (1) no treatment, (2) air abrasion, (3) acid etching, (4) Nd:YAG laser irradiation and (5) Er:YAG laser irradiation. Digital images from the surfaces were obtained by means of an atomic force microscope in tapping mode. Surface roughness was measured in 10 × 10 µm boxes. Surface roughness data were analysed by one way analysis of variance. The air abrasion group (550±212 nm) had a significantly higher mean surface roughness value than the other groups. The acid etching group (392±157 nm) had a significantly higher mean roughness value than the control group (228±105 nm). Surface roughness of lithium disilicate glass ceramic was not increased by any of the laser irradiation treatments.Öğe Beyazlatma ajanlarının estetik restoratif materyallerin yüzey özellikleri üzerine etkisi(İstanbul Medipol Üniversitesi Diş Hekimliği Fakültesi, 2016) İnan Kurugöl, Pelin; Kara, Haluk BarışBu çalışmanın amacı, bireylere diş hekimleri tarafından önerilerek evde uygulanan % 6 hidrojen peroksit (Opalescence GO) ve % 16 karbamid peroksit (Opalescence PF) beyazlatma ajanlarının, dental restorasyonlarda kullanılan üç farklı CAD/CAM porseleninin yüzey özellikleri üzerine etkilerini in situ olarak incelemektir. Çalışmada incelenmek üzere, feldspatik (Cerec), lösit ile güçlendirilmiş (IPS Empress CAD) ve lityum disilikat ile güçlendirilmiş (IPS e-max CAD) porselen bloklarından, her porselen grubundan otuzar adet olmak üzere, 6 x 6 x 2 mm boyutlarında, bir yüzeyi polisajlanmış, toplam doksan adet porselen örneği hazırlanmıştır. On gönüllü bireyin üst çenelerinden aljinat ile ölçü alınarak modelleri elde edilmiştir. Sert damak bölgelerine her bir porselen grubundan üçer adet olmak üzere, toplam dokuz adet porselen örneği, polisajlı yüzeyleri yukarıya bakacak şekilde yerleştirilerek, modeller üzerinde 0,9 mm kalınlığında beyazlatma plakları hazırlanmıştır. Her bir gönüllünün plağında bulunan kontrol grubundaki üç adet porselen örneğine beyazlatma ajanı uygulanmamış, hidrojen peroksit grubundaki porselenlere günde 90 dakika, karbamid peroksit grubundaki porselenlere ise günde 6 saat olmak üzere 10 gün boyunca beyazlatma işlemi uygulanmıştır. Beyazlatma uygulamaları öncesinde ve sonrasında, porselen örneklerin spektrofotometre ile renk, glossmetre ile parlaklık, temaslı profilometre ile pürüzlülük ve mikrosertlik test cihazı ile Vickers sertlik değerleri ölçülmüş, beyazlatma uygulamaları sonunda SEM ile x500 büyütmede görüntüler alınmıştır. İstatistiksel analizler, Two-way ANOVA, Oneway ANOVA testi, post hoc karşılaştırmalarında Tukey HSD test ve Tamhane's T2 testi ve Paired Sample t test kullanılarak yapılmıştır. Anlamlılık p<0.05 düzeyinde değerlendirilmiştir. Çalışmanın sonucunda, en fazla renk değişimi Cerec grubunda gözlenmiş, pürüzlülük değişimleri porselen grupları arasında anlamlı farklılık göstermemekle birlikte en fazla artış yine Cerec grubunda görülmüştür. Mikrosertlik değerleri, tüm gruplarda anlamlı değişim gösterirken, parlaklık değerlerinde anlamlı düşüş görülmüştür.Öğe Bond strength of resin composite to light activated bleached enamel(Wolters Kluwer Medknow Publications, 2016) Yavuz, Tevfik; Özyılmaz, Özgün Yusuf; Öztürk, Atiye Nilgun; Aykent, FilizObjectives: This study evaluated the microtensile bond strength (mu TBS) of a resin composite bonded to bleached enamel as a function of bleaching conditions. Materials and Methods: The whiteness hydrogen peroxide (HP) bleaching agent containing 35% HP was applied to the central incisors' facial enamel surface and irradiated as follows: No treatment (G1; control); no light (G2); light-emitting diode, the 40s (G3); diode laser, the 20s (G4); and neodymium: yttrium aluminum garnet laser, 20s (G5). A Variolink II resin composite structure was then built up incrementally on the surface. The teeth were sectioned into three 1.2 mm x 1.2 mm wide "I"-shaped sections. The specimens were then subjected to microtensile testing at a crosshead speed of 1 mm/min. Data were analyzed using one-way ANOVA (alpha = 0.05) followed by the Tukey Honestly Significant Difference post-hoc test. The fractured surfaces were observed with a stereomicroscope at x 100 magnification. Results: One-way ANOVA revealed no statistical differences among the groups (P > 0.05). No differences appeared between the groups bonded 14 days after bleaching (P > 0.05). Mean mu TBS values (MPa) were as follows: 22.05 +/- 5.01 (G1); 19.6 +/- 5.6 (G2); 19.3 +/- 5.4 (G3); 20.08 +/- 2.08 (G4); and 18.1 +/- 4.8 (G5). Many adhesive failures occurred at the bleached and irradiated enamel surfaces. Conclusion: The various irradiation treatments following the application of the whiteness HP bleaching agent to enamel did not significantly reduce the mu TBS within a 14-day period.Öğe Brand equity in digital marketing: What does it mean in the health sector and how does it affect consumer decisions?(EDP Sciences, 2023) Başal, Murat; Şarkbay, Ömer Faruk; Kılıçaslan, AlaaddinBusinesses are trying to achieve efficiency in marketing by using digital channels consisting of internet, social media and mobile platforms. The increase to be seen in the annual turnover of an enterprise, as well as the awareness of the brand, the interaction with the customers shows the brand equity. In other words, tangible and intangible assets are also related to brand equity. Here, the power of influence in the market, the customer's perception of value and brand loyalty are seen as factors affecting the situation. As a general concept, the health sector is the formation that deals with individuals and organizations that involve all phases from the production of health-related goods and services to consumption. It is formed by the decision of the consumer in the stages consisting of five steps taken up in the decision-making process of the consumer who needs a service or product. The aim of this study is to try to determine how consumers in the health sector have an effect on the decision-making process in order to understand the value that the consumer shows about a product or service about a business in digital marketing, which is the most important commercial shopping channel of today. In this direction, in order to obtain the necessary information about the field, data were collected from internet users in Istanbul using a Google form. These data were analyzed by applying t test and Anova test in SPSS system. As a result, a positive result has been reached as the effect of brand equity on consumer decision making in the health sector. It has been concluded that consumers give more importance to digital marketing channels and that this area should be more focused on in the health sector.Öğe CAD/CAM single-retainer monolithic zirconia ceramic resin-bonded fixed partial dentures bonded with two different resin cements: Up to 40 months clinical results of a randomized-controlled pilot study(Wiley, 2022) Bilir, Halenur; Yüzbaşıoğlu, Emir; Sayar, Gülşilay; Kılınç, Delal Dara; Gözükara Bağ, Harika Gözde; Özcan, MutluPurpose This pilot study was part of a larger study planned for the future which aimed to compare the clinical success of two different resin cements used in the cementation of CAD/CAM single-retainer monolithic zirconia ceramic resin-bonded fixed dentures (RBFPDs). Methods Twenty-four RBFPDs were fabricated with monolithic zirconia (Katana (TM) Zirconia HT, Kuraray Noritake Dental Inc, Tokyo, Japan). Panavia F2.0 (PF2.0; n = 12) and Panavia V5 (PV5; n = 12) were used for cementation. The survival period was defined as the time when the restoration was placed in the mouth and lasted until an irreparable damage occurred. The repairable failures were identified as relative and irreparable failures were identified as absolute failure. The survival rate of the RBFPDs was determined by the Kaplan-Meier estimator. Statistical significance was set at p < 0.05. Results The mean observation times of the PF2.0 group and the PV5 group were 40.45 +/- 6.15 months and 40.18 +/- 6.41 months, respectively. Four failures occurred in the PF2.0 group. No failure was observed in the PV5 group. The curves of survival rate (PF2.0 = 80%, PV5 = 100%) showed no statistically significant difference (p = 0.031), although success rate (PF2.0 = 66.7%, PV5 = 100%) showed statistically significant difference (p = 0.317). Conclusion Up to 40 months mean follow-up period, performance of RBFPDs bonded with PV5 was better than with PF2.0. Clinical Significance For clinicians, it is a matter of hesitation to apply single-retainer RBFPDs. This study contains results of 40 months (minimum 32, maximum 50.47 months) clinical follow-ups of single-retainer RBFPDs. These results will enlighten clinicians about the clinical success of the resin cement type for single-retainer monolithic zirconia ceramic RBFPDs.Öğe Cleaning efficacy of poly-ether-ether-ketone tips in eliminating cement remnants around implants with different abutment heights(Allen Press Inc, 2020) Koyuncuoğlu, Cenker Zeki; Kara, Haluk Barış; Akdemir, Sinan; Demir, Becen; Husain, Nadin Al-Haj; Özcan, MutluThe excess cement not removed after the cementation of fixed implant-supported restorations may cause loss of peri-implant attachment or adjacent bone. The aims of this study were to evaluate the amount of residual cement at different abutment-crown connection levels and to test the cleaning efficacy of poly-ether-ether-ketone (PEEK) ultrasonic tips after cementation. One implant was placed in an anterior central tooth position 5 mm below the gingival margin in an acrylic model, and 32 stone models were obtained with implant analogs. Abutment heights of 1-2 and 2.5-4 mm were used on the vestibular and lingual sides, respectively. Crowns were cemented and cleaned, and half of the samples were cleaned again using PEEK tips. The abutment-crown suprastructure was then disconnected, and cleaning efficacy was evaluated. Varying amounts of excess cement were found on all specimens except for the PEEK group with abutment-crown connections 1 mm below the gingival margin. An increase of undetected cement remnants was observed when the restoration margins were located deeper subgingivally. Various amounts of excess cement associated with margin location were detected on the abutment-restoration complex despite meticulous cleaning efforts. Ultrasonic PEEK tips were effective at cleaning the cement remnants around implants to a certain depth.Öğe Clinical performance of 3d printed resin composite posterior fixed dental prosthesis a permanent solution(2025) Hobbi, Paniz; Ordueri, Tuğçe Merve; Öztürk Bozkurt, Funda; Toz Akalın, Tuğba; Ateş, Mehmet Muzaffer; Özcan, MutluObjectives: This clinical trial aimed to evaluate the clinical outcomes of 3D-printed resin composite posterior fixed dental prosthesis (FDP) restorations. Materials and Methods: Between October 2020 and August 2022, 49 patients (33 females, 16 males, aged 19-60) received 68 3-unit 3D-printed resin composite posterior FDPs (ELS Even Stronger, Saremco, Switzerland). Follow-ups were conducted at baseline (2 weeks) by independent observers using modified FDI criteria, assessing anatomical form, marginal adaptation, surface roughness, color match, fracture, retention, and patient feedback. Fifty FDPs completed a 1-year follow-up, and 18 reached 2 years. Results: The mean observation period was 14.15 months. Failures were categorized as mechanical or bio-logical, with 19 FDPs failing: 14 mechanical (12 cohesive fractures) and 5 biological (3 needing endodontic treatment, 2 periodontal issues). Two FDPs were recemented. Three FDPs showed surface luster loss, color mismatches, and staining. The survival rate based on mechanical failures was 69.5%, dropping to 61.0% when including biological com-plications. Conclusions: After 2 years, 3D-printed resin composite FDPs demonstrated acceptable performance, with most failures due to fractures in the connector region, suggesting the need for design revisions.Öğe Clinical research clinical performance of posterior indirect resin composite restorations with the proximal box elevation technique: A prospective clinical trial up to 3 years(Quintessence Publishing Co, Inc, 2024) Gözetici Çil, Burcu; Öztürk Bozkurt, Funda; Genç Çalışkan, Gencay; Yılmaz, Burcu; Aksaka, Nurcan; Özcan, MutluPurpose: The study evaluated the clinical performance of partial indirect resin composite (PIRC) restorations with "proximal box elevation" (PBE) placed in molars. Materials and Methods: Sixty-three patients received 80 posterior PIRC (SR Nexco, Ivoclar Vivadent) restorations. Large posterior defects with cuspal loss and deep cervical margins were included in the study. PBE was performed prior to preparation and impression making. Two independent observers evaluated the restorations using the FDI criteria (scores 1-5) for esthetic, functional, and biological properties. Patients were recalled at 6 months and 1, 2, and 3 years. Overall success rates were calculated (Kaplan-Meier analysis) and compared (log-rank tests) according to baseline variables. The impact of the baseline variables on the failure of the restorations was analyzed (multiple proportional Cox regression). Results: Seventy-nine (98.7%), 69 (88.4%), 66 (92.9%), 44 (86.2%) and 45 (91.8%) PIRCs completed their follow up at baseline, 6 months, and 1, 2 and 3 years, respectively. In total, 10 failures were observed: 5 with partial loss, 4 with material chipping, and one with secondary caries, yielding an overall success rate of 87.5% and a survival rate of 93.8%, with a mean observation time of 26.5 +/- 13.6 months. Conclusions: PIRCs with PBE demonstrated a high survival rate and satisfactory esthetic properties. Failure was less likely for PIRC restorations with partial cuspal coverage (onlay) compared to full cuspal coverage (overlay).Öğe Color match of a feldspathic ceramic CAD-CAM material for ultrathin laminate veneers as a function of substrate shade, restoration color, and thickness(Mosby-Elsevier, 2018) Sarı, Taylan; Ural, Çağrı; Yüzbaşıoğlu, Emir; Duran, İbrahim; Cengiz, Seda; Kavut, İdrisStatement of problem. The final color of a ceramic restoration, especially an ultrathin veneer, is important, but selecting the correct shade is difficult because the substrate can affect the final color of the restoration. Purpose. The purpose of this in vitro study was to investigate the effect of substrate shade and thickness on the final color of ultrathin laminate veneers milled from feldspathic ceramic and to present a straightforward methodology with which a clinician can visualize the effects of substrate color, ceramic thickness, and prefabricated computer-aided design and computer-aided manufacturing (CAD-CAM) block color on the final color of the restoration. Material and methods. All specimens were fabricated by slicing CAD-CAM feldspathic ceramic material with a precision cutter into 12x10-mm slices of approximately 0.35, 0.55, 0.75, and 1.55 mm in thickness with 10 different colors (0M1-1M1-1M2-2M1-2M2-2M3-3M1-3M2-3M3-4M1). As a background substrate, composite resin disks (12x10x2 mm) were fabricated with different shades (0M1 S, 1M1 5, 2M3 S, 3M2 5, 4M3 5, 5M3 S). The CIELab values of the polished surfaces of each specimen were measured on a background (white or simulated foundation) with a spectrophotometer by a single experienced operator, and color differences (AE) were calculated. Mean SD values were calculated and subjected to ANOVA with 2 variables (substrate and ceramic color) (alpha=.05). Results. Combinations of a lighter substrate shade and a lighter value ceramic restoration and of a darker substrate shade and darker value ceramic restoration only changed the final color of the restoration minimally. Conclusions. The final color of a dental restoration is affected by the thickness of the restoration, the substrate color, and the ceramic color. Lighter and darker substrate colors show more color changes, and thin veneers cannot mask the substrate color.Öğe Comparison of digital and conventional impression methods by preclinical students: Efficiency and future expectations(Wolters Kluwer Medknow Publications, 2020) Bilir, Halenur; Aygüzen, CerenAims and Objectives: The purpose of this study is to compare digital and conventional impression methods by preclinical students in terms of time and ease and to evaluate their preferences and future expectations.Materials and Methods: Twenty volunteered, 2nd year preclinical students (11 females and 9 males) participated in this study. Students took digital and conventional impressions of the left lower first molar which was made full ceramic crown preparation and opposite full arch from a typodont model (Frasaco, Frasaco GmbH, Tettnang, Germany). They used intraoral scanner (CEREC Omnicam, Sirona Dental GmbH, Bensheim, Germany) for digital impression and also used additional type (Express XT Penta H, 3M ESPE, Seefeld, Germany) and condensation type (Zetaplus, Zhermack SpA, Badia Polesine, Italy) silicones for conventional impression. Their taking impression time was measured. Before taking impression and after taking impression, two kinds of questionnaires were conducted to students about their preference, ease of impression methods, and their future expectations. Statistical analysis was performed by IBM SPSS 23 and Excel 2010 version. Differences between conventional and digital impression in terms of time were analyzed by student's-t paired test and effect of gender was analyzed by students's-t independent test.Results: There were statistically significant differences between digital and conventional impression methods in terms of taking impression and total impression time (P < 0.001). But there wasn't any statistically significant difference between two methods in terms of preparation time. About 85% of students preferred the digital impression method and also 85% of students found that the digital impression method was easy. 95% of students expected to find intraoral scanner in the clinic where working first time.Conclusions: As a result of this study, it has been seen that the students preferred the digital impression method to the conventional impression method and found that the digital impression method was easier.
