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KMID : 1023820180100040300
The Journal of Advanced Prosthodontics
2018 Volume.10 No. 4 p.300 ~ p.307
In vitro performance and fracture resistance of novel CAD/CAM ceramic molar crowns loaded on implants and human teeth
Preis Verena

Hahnel Sebastian
Behr Michael
Rosentritt Martin
Abstract
PURPOSE: To investigate the fatigue and fracture resistance of computer-aided design and computer-aided manufacturing (CAD/CAM) ceramic molar crowns on dental implants and human teeth.

MATERIALS AND METHODS: Molar crowns (n=48; n=8/group) were fabricated of a lithium-disilicate-strengthened lithium aluminosilicate glass ceramic (N). Surfaces were polished (P) or glazed (G). Crowns were tested on human teeth (T) and implant-abutment analogues (I) simulating a chairside (C, crown bonded to abutment) or labside (L, screw channel) procedure for implant groups. Polished/glazed lithium disilicate (E) crowns (n=16) served as reference. Combined thermal cycling and mechanical loading (TC: 3000¡¿5¡É/3000¡¿55¡É; ML: 1.2¡¿106 cycles, 50 N) with antagonistic human molars (groups T) and steatite spheres (groups I) was performed under a chewing simulator. TCML crowns were then analyzed for failures (optical microscopy, SEM) and fracture force was determined. Data were statistically analyzed (Kolmogorow-Smirnov, one-way-ANOVA, post-hoc Bonferroni, ¥á=.05).

RESULTS: All crowns survived TCML and showed small traces of wear. In human teeth groups, fracture forces of N crowns varied between 1214¡¾293 N (NPT) and 1324¡¾498 N (NGT), differing significantly (P¡Â.003) from the polished reference EPT (2044¡¾302 N). Fracture forces in implant groups varied between 934¡¾154 N (NGI_L) and 1782¡¾153 N (NPI_C), providing higher values for the respective chairside crowns. Differences between polishing and glazing were not significant (P¡Ã.066) between crowns of identical materials and abutment support.

CONCLUSION: Fracture resistance was influenced by the ceramic material, and partly by the tooth or implant situation and the clinical procedure (chairside/labside). Type of surface finish (polishing/glazing) had no significant influence. Clinical survival of the new glass ceramic may be comparable to lithium disilicate.
KEYWORD
Glass ceramic, Dental crown, Dental implant, Fatigue, Fracture resistance
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