Kamel F M
Operative Dept., Faculty of Oral & Dental Medicine, Cairo University.
Egypt Dent J. 1995 Jul;41(3):1313-20.
A total of 80 freshly extracted human molars, free from caries, cracks & decalcifications, were used in this study. Conservative class I cavities were prepared in the occlusal surface. Two types of amalgam alloys were used, high copper (Dispersalloy) & conventional (Velvalloy). The prepared cavities were classified into 5 groups, 16 each carve (C), carve & polish (CP), precarve burnish (BC), past-carve (CB) & pre post carve burnish (BCB). The specimens were thermally stressed using the stress fatigue device. The marginal integrity of the amalgam enamel interface were evaluated using SEM, for the four marginal quantities: 1--excellent margin, 2--open margins, 3--enamel fracture, and 4--amalgam fracture. The results of this study revealed that higher copper amalgam demonstrated superior marginal integrity than the conventional one. The pre-post carve burnish group showed the highest percentage of excellent margin than the other groups.
本研究共使用了80颗新拔除的、无龋、无裂纹及脱钙的人类磨牙。在咬合面制备保守的I类洞。使用了两种类型的汞合金，高铜型（Dispersalloy）和传统型（Velvalloy）。将制备好的洞分为5组，每组16个，分别为雕刻（C）、雕刻并抛光（CP）、雕刻前打磨（BC）、雕刻后（CB）以及雕刻前后打磨（BCB）。使用应力疲劳装置对标本进行热应力处理。使用扫描电子显微镜（SEM）评估汞合金-牙釉质界面的边缘完整性，评估四个边缘质量等级：1 - 边缘极佳，2 - 边缘开放，3 - 牙釉质断裂，4 - 汞合金断裂。本研究结果显示，高铜汞合金的边缘完整性优于传统汞合金。雕刻前后打磨组的边缘极佳比例高于其他组。
