Fracture Strength, Failure Types, and Weibull Characteristics of Three-Unit Zirconia Fixed Dental Prostheses After Cyclic Loading: Effects of Veneering and Air-Abrasion Protocols

被引:6
作者
Campos, Femanda [1 ]
Souza, Rodrigo O. A. [2 ]
Bottino, Marco A. [1 ]
Ozcan, Mutiu [3 ]
机构
[1] Sao Paulo State Univ, Sao Jose dos Campos Dent Sch, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, Brazil
[2] Univ Fed Rio Grande do Norte, Dept Dent, Div Prosthodont, Natal, RN, Brazil
[3] Univ Zurich, Dent Mat Unit, Ctr Dent & Oral Med, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Zurich, Switzerland
基金
巴西圣保罗研究基金会;
关键词
LAYERED CERAMIC STRUCTURES; BIAXIAL FLEXURAL STRENGTH; Y-TZP ZIRCONIA; PARTICLE ABRASION; PARTIAL DENTURES; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; SURFACE-TOPOGRAPHY; BOND STRENGTH; IN-VITRO;
D O I
10.11607/prd.2524
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
The required connector dimension for zirconia fixed dental prostheses (FDPs) may be a clinical limitation due to limited space in the occlusogingival direction. Using no veneering in the gingival regions of the pontics and connectors may solve this problem. This study evaluated the mechanical durability of zirconia FDPs with and without veneering in the gingival area of the connectors and pontics and subsequent air-abrasion of this region with different protocols. Models were made of resin abutments (diameter = 6 or 8 mm, height = 6 mm, 6 degrees convergence) and embedded in polyurethane resin (distance = 11 mm). Zirconia frameworks were milled and randomly distributed by veneering (veneering of the entire framework [VEN] or no veneering at gingival regions of the pontic and connector [NVEN]) and by air-abrasion (Al2O3/SiO2, 30 mu m; or 45 mu m Al2O3). FDPs were adhesively cemented and subjected to mechanical cycling (1,200,000 cycles, 200 N, 4 Hz, with water cooling). Specimens were tested until fracture (1 mm/min), and failure modes were classified. Data ( N) were subjected to one-way analysis of variance in two sets, Tukey test (alpha = .05) and Weibull analysis. While veneering did not significantly affect the results (VEN: 1,958 +/- 299 N; NVEN: 1,788 +/- 152 N; P = .094), air abrasion did (P = .006), with the worst results for the groups conditioned with 45 mu m Al2O3 (SiO2 : 1,748 +/- 273 N; Al2O3 : 1,512 +/- 174 N). The NVEN group demonstrated the highest Weibull modulus (12.8) compared with the other groups (5.3-7.2). Fractures commonly initiated from the gingival side of the connector. Veneering of the gingival region of the connectors and pontics in zirconia FDPs did not diminish the fracture strength, but air-abrasion of this area with 45 mu m Al2O3 decreased the results.
引用
收藏
页码:901 / 908
页数:8
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