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    Comparison of implant versus tooth-supported zirconia-based single crowns in a split-mouth design: A 4-year clinical follow-up study
    (Springer Heidelberg, 2016) Güncü, Mustafa Barış; Çakan, Umut; Aktaş, Güliz; Nigar Güncü, Güliz; Canay, Şenay
    This study aims to evaluate the 4-year clinical performance of tooth versus implant-supported single-unit zirconia crowns (LAVA (TM)) placed on posterior region. Twenty-four patients (10 men and 14 women) who had received 48 single crowns (24 implant-supported and 24 tooth-supported) from January 2007 to December 2009, were included. California Dental Association (CDA) quality assessment system, plaque and gingival index scores were used to evaluate the performance of the crowns at baseline and at all follow-up examinations. During the follow-up period, no fracture of zirconia coping has occurred. Major complication was chipping in three patients that required a new crown fabrication. Except for the failure ones, all crowns in both groups were rated as satisfactory at the follow-up examinations based on the CDA quality assessment criteria. There were no statistically significant differences between tooth and implant-supported crowns in terms of periodontal parameters. The present 4-year follow-up clinical study demonstrates that single-unit tooth- and implant-supported zirconia crowns have similar prosthetic and periodontal outcomes. Single-unit implant or tooth-supported zirconia crowns may be considered acceptable treatment modalities for restoration of either missing or compromised posterior teeth.
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    Effect of anti-rotational abutment features and novel computerized fabrication techniques on the marginal fit of implant-supported metal copings
    (Wiley, 2021) Aktaş, Güliz; Güncü, Mustafa Barış; Akçin, Elif Tuba; Çakan, Umut; Canay, Şenay
    Purpose An in vitro study to compare the marginal fit of cobalt-chromium (Co-Cr) metal copings fabricated with selective laser melting (SLM), computer-aided design and computer-aided manufacturing (CAD/CAM) milling, and lost-wax (LW) techniques, on abutments with two different antirotational features. Materials and Methods A total of 60 stainless steel abutments with the same length and convergence angles were fabricated using a numerical control machining. Half of the abutments had one flat plane, while the other half had three grooves as an antirotation feature. Thirty abutments of each kind were then divided into three subgroups, and metal copings were fabricated with SLM, CAD/CAM milling, or the LW technique (n = 10). The metal copings were cemented with polycarboxylate cement. Marginal gap measurements were performed using a stereomicroscope at a magnification of x 45 and data were analyzed with two-way analysis of variance (ANOVA) tests. Results The LW (p= 0.002) and CAD/CAM (p< 0.001) techniques exhibited increased marginal gaps on the abutments with a three groove antirotational feature; however, no significant difference was detected with the SLM technique (p= 0.259). The copings fabricated with the SLM technique demonstrated significantly lower gap values in both abutment types (p< 0.001). Conclusion While all marginal gap values were within the clinically acceptable range (<120 mu m), abutments with more antirotational grooves exhibited wider marginal gaps with the LW and CAD/CAM techniques.
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    Zirconia-based crowns up to 5 years in function: A retrospective clinical study and evaluation of prosthetic restorations and failures
    (Quintessence Publishing, 2015) Güncü, Mustafa Barış; Çakan, Umut; Muhtaroğulları, Mehmet; Canay, Şenay
    Purpose: The purpose of this retrospective study was to evaluate the 5-year clinical performance and failure rate of single- or multiple-unit zirconia-based crowns. Materials and Methods: A total of 148 patients (39 men and 109 women, mean age: 46.9 ± 10.6 years) treated in university and private practices with 618 single- or multiple-unit zirconia-based (Lava) crowns made on natural teeth from January 2007 to December 2008 were included. Two hundred fifty-nine anterior and 359 posterior crowns were examined. A core and/or veneer fracture that required replacement of the restoration was considered to be a failure. The cumulative survival rate (CSR) was described with Kaplan-Meier survival functions. The crowns replaced for other reasons were deemed lost to follow-up, and esthetic, functional, and biologic complications were rated. Results: At the 5-year follow-up, no zirconia core fractures were observed. Twelve veneer fractures that required crown replacement were detected. The CSR was 98.1%. There was a statistically significant difference between survival of the anterior and posterior restorations (P < .001). In total, 116 crowns experienced biologic and technical complications. The most common complications were smooth veneer fracture (4, 0.6%), loss of retention (7, 1%), staining because of smoking (24, 4%), and gingival recession (48, 8%). Conclusions: According to the 5-year CSR (98.1%) observed in this study, zirconia-based single or multiple crowns may be considered an acceptable treatment modality for the replacement of anterior and posterior teeth. Results from the current study should be supported by additional randomized clinical trials.