TY - JOUR T1 - In vitro performance and fracture resistance of CAD/CAM-fabricated implant supported molar crowns. AU - Rosentritt,Martin, AU - Hahnel,Sebastian, AU - Engelhardt,Frank, AU - Behr,Michael, AU - Preis,Verena, Y1 - 2016/07/01/ PY - 2016/03/01/received PY - 2016/06/27/accepted PY - 2016/7/3/pubmed PY - 2018/4/3/medline PY - 2016/7/3/entrez KW - Abutment KW - CAD/CAM composites/ceramics KW - Chewing simulation KW - Fracture resistance KW - Implant crown KW - Zirconia-reinforced lithium silicate SP - 1213 EP - 1219 JF - Clinical oral investigations JO - Clin Oral Investig VL - 21 IS - 4 N2 - OBJECTIVES: The aim of this study is to investigate the performance and fracture resistance of different CAD/CAM ceramic and composite materials as implant- or tooth-supported single crowns with respect to the clinical procedure (screwed/bonded restoration). MATERIALS AND METHODS: One hundred twenty crowns were fabricated on implants or human molar teeth simulating (a) chairside procedure ([CHAIR] implant crown bonded to abutment), (b) labside procedure ([LAB] abutment and implant crown bonded in laboratory, screwed chairside), and (c) reference ([TOOTH] crowns luted on human teeth). Four materials were investigated: ZLS (zirconia-reinforced lithium silicate ceramic; Celtra Duo, Degudent: polished (P)/crystallized (C)), RB (resin-based composite; Cerasmart, GC), and RIC (resin-infiltrated ceramic; Enamic, Vita-Zahnfabrik). LiS (lithiumdisilicate; Emax CAD, Ivoclar-Vivadent) served as reference. Combined thermal cycling and mechanical loading (TCML) was performed simulating a 5-year clinical situation. Fracture force was determined. Data were statistically analyzed (Kolmogorov-Smirnov test, one-way ANOVA; post hoc Bonferroni, α = 0.05). RESULTS: One crown of ZLS_C[LAB] (1,200,000 cycles) and RB[CHAIR] (890 cycles) failed during TCML. Fracture values varied between 977.7 N(RB) and 3070.4 N(LiS)[CHAIR], 1130.6 N(RB) and 2998.1 N(LiS)[LAB], and 1802.4 N(ZLS) and 2664.3 N(LiS)[TOOTH]. Significantly (p < 0.003) different forces were found between the materials in all three groups. ZLS_C, RIC, and RB showed significantly (p < 0.014) different values for the individual groups. CONCLUSIONS: Partly ceramic and resin-based materials performed differently on implant or tooth abutments. The insertion of a screw channel reduced the stability for individual crown materials. Insertion of the screw channel should be performed carefully. CLINICAL RELEVANCE: All restorations were in a range where clinical application seems not restricted, but insertion of a screw channel might reduce stability of individual materials. SN - 1436-3771 UR - https://www.unboundmedicine.com/medline/citation/27370027/In_vitro_performance_and_fracture_resistance_of_CAD/CAM_fabricated_implant_supported_molar_crowns_ DB - PRIME DP - Unbound Medicine ER -