In vitro performance and fracture resistance of novel CAD/CAM ceramic molar crowns loaded on implants and human teeth
The Journal of Advanced Prosthodontics
;
: 300-307, 2018.
Artículo
en Inglés
| WPRIM
| ID: wpr-742045
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 ANDMETHODS:
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℃/3000×55℃; 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, α=.05).RESULTS:
All crowns survived TCML and showed small traces of wear. In human teeth groups, fracture forces of N crowns varied between 1214±293 N (NPT) and 1324±498 N (NGT), differing significantly (P≤.003) from the polished reference EPT (2044±302 N). Fracture forces in implant groups varied between 934±154 N (NGI_L) and 1782±153 N (NPI_C), providing higher values for the respective chairside crowns. Differences between polishing and glazing were not significant (P≥.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.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Diente
/
Técnicas In Vitro
/
Implantes Dentales
/
Cerámica
/
Diseño Asistido por Computadora
/
Coronas
/
Fatiga
/
Vidrio
/
Litio
/
Masticación
Límite:
Humanos
Idioma:
Inglés
Revista:
The Journal of Advanced Prosthodontics
Año:
2018
Tipo del documento:
Artículo
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