The failure load of CAD/CAM generated zirconia and glass-ceramic laminate veneers with different preparation designs.
J Prosthet Dent
; 108(6): 386-93, 2012 Dec.
Article
em En
| MEDLINE
| ID: mdl-23217471
ABSTRACT
STATEMENT OF PROBLEM:
Fracture of feldspathic porcelain laminate veneers represents a significant mode of clinical failure. Therefore, ceramic materials that withstand a higher load to fracture, especially for patients with parafunctional habits, are needed.PURPOSE:
The purpose of this study was to examine the correlation of material (zirconia, TZP, glass-ceramic, IEC, and feldspathic porcelain, FP) design (incisal overlapped preparation, IOP, and three-quarter preparation, TQP), and fracture mode to failure load for veneers supported by composite resin abutments. MATERIAL ANDMETHODS:
A typodont tooth prepared with 2 designs (IOP, TQP) and the corresponding 2 definitive dies were used to fabricate the composite resin abutments (30 for IOP and 30 for TQP). Ten veneer specimens for each system (Y-TZP, IEC, and FP), were fabricated for each design. The veneers were cemented, invested, and tested in compression until failure by using a universal testing machine. Significant differences were evaluated by 2-factor ANOVA (α=.05).RESULTS:
No statistical mean load difference was noted between the preparation designs for Y-TZP (IOP 244 ±81 and TQP 224 ±58 N), IEC (IOP 306 ±101 and TQP 263 ±77 N), and FP veneers (IOP 161 ±93 and TQP 246 ±45 N). No statistical difference in the mean load was found among the 3 veneer materials for each preparation design except between IEC (306 ±101 N) and FP (161 ±93 N) veneers for TQP.CONCLUSIONS:
Preparation design did not influence the failure load of the veneer materials. Zirconia veneers were the least likely to fracture but the most likely to completely debond; feldspathic porcelain veneers exhibited the opposite characteristics.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ítrio
/
Zircônio
/
Cerâmica
/
Planejamento de Prótese Dentária
/
Desenho Assistido por Computador
/
Porcelana Dentária
/
Facetas Dentárias
Limite:
Humans
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article