IADR Abstract Archives
Clinical evaluation of chair-side fabricated molar partial zirconia-containing lithium-silicate (ZLS) crowns – first results
Objectives: Zirconia-containing lithium silicate ceramics (ZLS) are 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 partial ZLS molar crowns were evaluated in a practice-based prospective study.
Methods: Between October 2013 and April 2014, 34 patients (20 female/14 male, age at insertion: 50.1±15.5 years) were restored with 48 partial molar crowns. The monolithic restorations were fabricated chair-side (Cerec SW 4.2/Cerec MC XL) from a ZLS ceramic material (Celtra Duo, Dentsply DeTrey, Konstanz, Germany). The restorations were milled, polished without glazing, and finally adhesively cemented in the total-etch technique with a dual-curing composite material. 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: 12.4 ± 1.0 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%). No masticatory problems or thermal sensitivity were reported. During the observational period, one clinical intervention was necessary (endodontic treatment) to maintain function. Material-induced technical complications (fractures) were not determined. The success rate (complication-free restoration) was 97.9%.
Conclusions: Initially, chair-side fabricated ZLS crowns show a good clinical perfomance. 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 October 2013 and April 2014, 34 patients (20 female/14 male, age at insertion: 50.1±15.5 years) were restored with 48 partial molar crowns. The monolithic restorations were fabricated chair-side (Cerec SW 4.2/Cerec MC XL) from a ZLS ceramic material (Celtra Duo, Dentsply DeTrey, Konstanz, Germany). The restorations were milled, polished without glazing, and finally adhesively cemented in the total-etch technique with a dual-curing composite material. 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: 12.4 ± 1.0 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%). No masticatory problems or thermal sensitivity were reported. During the observational period, one clinical intervention was necessary (endodontic treatment) to maintain function. Material-induced technical complications (fractures) were not determined. The success rate (complication-free restoration) was 97.9%.
Conclusions: Initially, chair-side fabricated ZLS crowns show a good clinical perfomance. However, for a final evaluation of this new material, clinical data from studies with a larger population and longer observational periods are required.