Segura A, Riggins R
Department of Hospital Dentistry, University of Iowa, Iowa City, USA.
J Oral Rehabil. 1999 Dec;26(12):928-31. doi: 10.1046/j.1365-2842.1999.00476.x.
The purpose of this study was to compare the fracture resistance of four posterior restorations involving an entire cusp replacement. Four groups were established, each containing eight caries-free mandibular molars, similar in size and anatomic form. A mesio-occlusal preparation including the lingual cusp was prepared on all teeth. Group A were restored with a pin-retained amalgam. Group B were restored with amalgam and a meta adhesive. Group C were restored with a composite resin with a beta-glass quartz insert. Group D were restored with composite resin and a HEMA adhesive. All specimens were mounted in acrylic and stored in artificial saliva for 30 days. Each specimen was loaded in compression at a 90 degrees angle in an Instron testing machine with a crosshead speed of 0.5 cm/min. Results demonstrated the mean (SD) failure loads in kilograms for each group to be: A, 1155 (388); B, 1232 (436); C, 1345 (375); D, 1595 (373). Analysis of variance indicated no significant difference among groups at P<0.05. Although the values for the composite resin restoration with the adhesive were higher than the other restorative techniques.
本研究的目的是比较四种涉及整个牙尖替换的后牙修复体的抗折性。设立了四组，每组包含八颗无龋的下颌磨牙，尺寸和解剖形态相似。在所有牙齿上制备包括舌侧牙尖的近中咬合面预备体。A组用桩固位银汞合金修复。B组用银汞合金和金属黏合剂修复。C组用含β-玻璃石英嵌体的复合树脂修复。D组用复合树脂和甲基丙烯酸羟乙酯黏合剂修复。所有标本用丙烯酸树脂包埋并在人工唾液中保存30天。每个标本在Instron试验机中以90度角进行压缩加载，十字头速度为0.5 cm/min。结果表明每组以千克为单位的平均（标准差）破坏载荷为：A组，1155（388）；B组，1232（436）；C组，1345（375）；D组，1595（373）。方差分析表明在P<0.05时各组之间无显著差异。尽管使用黏合剂的复合树脂修复体的值高于其他修复技术。
