氧化铝磨损和水泥粘结剂对瓷贴面材料强度的影响。

Fleming Garry J P, Jandu Harprit S, Nolan Lawrence, Shaini F J

Biomaterials Unit, School of Dentistry, University of Birmingham, St Chad's Queensway, Birmingham B4 6NN, UK.

J Dent. 2004 Jan;32(1):67-74. doi: 10.1016/j.jdent.2003.08.004.

OBJECTIVES

The purpose of the current study was to examine whether alumina abrasion regime influenced the necessary surface roughness conducive to mechanical interlocking prior to composite resin bonding. The impact of alumina abrasion and cement lute on the bi-axial flexure strength and associated Weibull Moduli (m) on the cemented surfaces of disc specimens of porcelain laminate veneer (PLV) materials was therefore investigated.

METHODS

Sets of 20 Vitadur-alpha dentine porcelain discs (15 mm diameter, 1.7 mm thickness) were condensed and prepared by abrading with 25, 50 or 110 microm alumina. Further specimen groups were stored wet or coated with a resin cement. Mean fracture strengths, standard deviations and associated m were determined using a ball-on-ring assembly. The surface roughness was assessed using profilometry and scanning electron microscopy.

RESULTS

The one-way ANOVA revealed a significant reduction (P<0.05) between the means of the dry control and alumina abraded specimens. A significant increase in m was identified for 50 and 110 microm alumina abraded cemented specimens (6.1+/-1.4 and 6.0+/-1.3, respectively) compared with the 25 microm alumina abraded cemented and non-alumina abraded cemented controls (3.9+/-0.9 and 3.5+/-0.8, respectively). Increasing the alumina particle size utilised for the abrasion resulted in a decrease in the surface roughness (R(a) value) which is the arithmetic mean of the absolute departures of the roughness profile from the mean line.

SIGNIFICANCE

Alumina abrasion acted to replace surface defects with a narrower distribution of defects. Composite resin polymerisation shrinkage may prevent surface flaws from being extended by healing the key surface defects and would appear to suggest that the use of a resin-based luting material may reduce the potential for crack propagation. Given the arrangement of ions across crack tips it is more likely that the resin composite cement enhanced strength by acting to heal key defects rather than imposing a compressive stress on the porcelain surface as suggested previously.

目的

本研究旨在探讨氧化铝磨损方式是否会影响复合树脂粘结前有利于机械嵌合的必要表面粗糙度。因此，研究了氧化铝磨损和粘结剂对烤瓷贴面（PLV）材料圆盘试件粘结表面的双轴弯曲强度及相关韦布尔模量（m）的影响。

方法

将20组Vitadur-alpha牙本质瓷盘（直径15mm，厚度1.7mm）进行压缩，并分别用25、50或110微米的氧化铝进行研磨制备。其他试件组分别进行湿储存或用树脂粘结剂涂层处理。使用环上球组件测定平均断裂强度、标准差及相关的m值。通过轮廓仪和扫描电子显微镜评估表面粗糙度。

结果

单因素方差分析显示干燥对照组和氧化铝磨损试件组的均值之间存在显著降低（P<0.05）。与25微米氧化铝磨损粘结试件组和未进行氧化铝磨损的粘结对照组（分别为3.9±0.9和3.5±0.8）相比，50和110微米氧化铝磨损粘结试件组的m值显著增加（分别为6.1±1.4和6.0±1.3）。用于磨损的氧化铝粒径增加导致表面粗糙度（R(a)值）降低，R(a)值是粗糙度轮廓相对于平均线的绝对偏差的算术平均值。