IADR Abstract Archives
Chair-side fabricated partial crowns made from zirconia-reinforced lithium-silicate (ZLS) ceramics – first results of a case series
Objectives: Zirconia-reinforced lithium silicate ceramics (ZLS) represent a new material group, characterized by a high mechanical capacity and good optical properties. Up to now, data on the clinical performance of this type of restorations are missing. Based on this background, CAD/CAM-fabricated monolithic ZLS partial crowns were evaluated in a university-based prospective case series.
Methods: Between January 2014 and March 2014, 13 patients (5 female/8 male, age at insertion: 48.8±9.3 years) were restored with 9 premolar and 7 molar partial crowns. The monolithic restorations were fabricated chair-side (Cerec SW 4.2/Cerec MC XL) from a ZLS ceramic material (Vita Suprinity, Vita Zahnfabrik, Bad Saeckingen, Germany). The restorations were milled, polished, and glazed, finally adhesively cemented applying the total-etch technique with a dual-curing composite material (Variolink II, Ivoclar Vivadent, Schaan, Liechtenstein). At baseline, all teeth were vital and asymptomatic. The patients did not show any signs of craniomandibular dysfunctions or bruxism. Follow-up examinations were performed 6 resp. 12 months after insertion (observational period: 11.7 ± 0.8 months), the following modified USPHS parameters were evaluated: retention, color match, marginal discoloration, secondary caries, anatomic form, marginal adaptation, surface texture. Moreover, the parameters “time-dependent survival” (in situ criterion), and “success rates” (event-free restorations) were evaluated according to Kaplan-Meier.
Results: At the 12 months follow-up examination, all restorations were in situ (survival rate: 100%). Minor thermal sensitivity was reported for two restorations. During the observational period, no clinical intervention was necessary to maintain function. Material-induced technical complications (fractures) were not determined. The success rate (complication-free restoration) was 100%.
Conclusions: Initially, chair-side fabricated ZLS crowns investigated in this study show a good clinical performance. However, for a final evaluation of this new material, clinical data from studies with a larger population and longer observational periods are required.
Methods: Between January 2014 and March 2014, 13 patients (5 female/8 male, age at insertion: 48.8±9.3 years) were restored with 9 premolar and 7 molar partial crowns. The monolithic restorations were fabricated chair-side (Cerec SW 4.2/Cerec MC XL) from a ZLS ceramic material (Vita Suprinity, Vita Zahnfabrik, Bad Saeckingen, Germany). The restorations were milled, polished, and glazed, finally adhesively cemented applying the total-etch technique with a dual-curing composite material (Variolink II, Ivoclar Vivadent, Schaan, Liechtenstein). At baseline, all teeth were vital and asymptomatic. The patients did not show any signs of craniomandibular dysfunctions or bruxism. Follow-up examinations were performed 6 resp. 12 months after insertion (observational period: 11.7 ± 0.8 months), the following modified USPHS parameters were evaluated: retention, color match, marginal discoloration, secondary caries, anatomic form, marginal adaptation, surface texture. Moreover, the parameters “time-dependent survival” (in situ criterion), and “success rates” (event-free restorations) were evaluated according to Kaplan-Meier.
Results: At the 12 months follow-up examination, all restorations were in situ (survival rate: 100%). Minor thermal sensitivity was reported for two restorations. During the observational period, no clinical intervention was necessary to maintain function. Material-induced technical complications (fractures) were not determined. The success rate (complication-free restoration) was 100%.
Conclusions: Initially, chair-side fabricated ZLS crowns investigated in this study show a good clinical performance. However, for a final evaluation of this new material, clinical data from studies with a larger population and longer observational periods are required.