粘结技术对循环加载后氧化铝全瓷冠断裂强度和边缘密合性的影响。

Influence of cementation technique on fracture strength and leakage of alumina all-ceramic crowns after cyclic loading.

作者信息

Blatz Markus B, Oppes Steven, Chiche Gerard, Holst Stefan, Sadan Avishai

机构信息

Department of Preventive and Restorative Schiences, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104, USA.

出版信息

Quintessence Int. 2008 Jan;39(1):23-32.

PMID:18551213

Abstract

OBJECTIVE

To compare in vitro the influence of 3 cementation techniques on leakage and fracture strength of alumina all-ceramic crowns after cyclic loading in an artificial chewing simulator.

METHOD AND MATERIALS

Forty-eight extracted molars were mounted in a way that simulates natural tooth mobility. Crowns (Procera Alumina, Nobel Biocare) were fabricated and inserted with either conventional cementation with zinc phosphate cement without pretreatment (group ZOP); cementation with a universal adhesive resin cement without pretreatment (group HYB); or adhesive bonding with composite resin after pretreatment of the tooth (dentin bonding agent) and the crown (airborne-particle abrasion and a special ceramic priming agent containing adhesive monomers that bond to metal-oxide ceramics) (group ADH). All specimens were stored in artificial saliva and subjected to 1.2 million load cycles in a dual-axis chewing simulator (Willytec). Eight specimens per group were subjected to compressive load until failure, while the remaining 8 specimens were stained and sectioned for measuring of dye penetration. One-way ANOVA and Tukey HSD were used for statistical analyses (alpha = .05).

RESULTS

Cementation techniques were significantly different (P = .009) in regard to mean load at failure. Fracture strength was significantly greater for ADH (mean load at fracture, 2,782 +/- 419 N) as compared to HYB (1,980 +/- 270 N) or ZOP (1,788 +/- 242 N). All groups differed significantly for leakage values (P < .001), with ADH showing the lowest mean leakage (0.04 +/- 0.07 mm), followed by HYB (0.96 +/- 0.16 mm) and ZOP (2.44 +/- 0.19 mm).

CONCLUSION

Cementation technique affects fracture strength and leakage of all-ceramic molar crowns. Fracture strengths were well above natural chewing forces for all cementation methods. However, adhesive bonding significantly increased fracture strength and improved marginal seal of alumina crowns.

摘要

目的

在体外比较3种粘结技术对氧化铝全瓷冠在人工咀嚼模拟器中循环加载后的边缘密合性和抗折强度的影响。

方法和材料

48颗拔除的磨牙以模拟天然牙动度的方式进行固定。制作全瓷冠（Procera Alumina，诺贝尔生物公司），并分别采用以下方法进行粘结：未进行预处理，用磷酸锌水门汀进行传统粘结（ZOP组）；未进行预处理，用通用粘结树脂水门汀进行粘结（HYB组）；在对牙齿（牙本质粘结剂）和全瓷冠（空气颗粒喷砂处理以及使用一种含有能与金属氧化物陶瓷结合的粘结单体的特殊陶瓷底漆）进行预处理后，用复合树脂进行粘结（ADH组）。所有标本均保存在人工唾液中，并在双轴咀嚼模拟器（威利泰克）中进行120万次加载循环。每组8个标本进行压缩加载直至破坏，其余8个标本进行染色并切片以测量染料渗透情况。采用单因素方差分析和Tukey HSD检验进行统计学分析（α = 0.05）。

结果

粘结技术在破坏时的平均载荷方面存在显著差异（P = 0.009）。与HYB组（1980±270 N）或ZOP组（1788±242 N）相比，ADH组的抗折强度显著更高（破坏时的平均载荷为2782±419 N）。所有组的边缘密合性值存在显著差异（P < 0.001），ADH组的平均边缘密合性最低（0.04±0.07 mm），其次是HYB组（0.96±0.16 mm）和ZOP组（2.44±0.19 mm）。