Mahmoud Salah Hasab, Al-Wakeel Essam El Saeid
Department of Operative Dentistry, Mansoura University, Mansoura, Egypt.
Quintessence Int. 2011 Nov-Dec;42(10):e131-9.
To assess the marginal adaptation of ormocer-, silorane-, and methacrylate-based composite restorative systems bonded to dentin cavities after water storage.
Cylindric dentin cavities were prepared on the buccal surfaces of 45 extracted human molars after their enamel was removed. The cavities were assigned to one of three groups (each n = 15). Each group was restored with one of three composite/adhesive systems: an ormocer-based (Admira/Admira Bond), a silorane-based (Filtek P90/P90 System Adhesive), and a methacrylate-based (Tetric Ceram/Excite). Marginal adaptation was evaluated immediately after polymerization and after 1 month and 1 year of water aging and thermocycling. Evaluation was performed under a metallographic microscope by recording frequency of gap-free restorations, width of maximum marginal gap (MG), percentage length of debonded margins relative to cavity periphery (DM), and marginal index (MI = MG x DM/100). The results were statistically analyzed with two-way ANOVA and the Tukey test at α = .05.
None of the composite/adhesive systems examined exhibited gap-free restorations at any aging time. Marginal adaptation was significantly affected by the type of restorative/adhesive system, while water aging time had no significant effect. Silorane composite restorations exhibited the lowest MG, DM, and MI values, while methacrylate composite restorations revealed the highest values. Ormocer restorations showed intermediate values.
Although all examined composite systems failed to achieve gap-free margins with dentin cavities, the silorane-based system revealed the best marginal adaptation at all aging times.
评估储水后与牙本质洞粘结的基于有机硅氧烷、硅烷和甲基丙烯酸酯的复合修复系统的边缘适应性。
在45颗拔除的人类磨牙的颊面去除釉质后制备圆柱形牙本质洞。这些洞被分为三组之一（每组n = 15）。每组用三种复合/粘结系统之一进行修复：基于有机硅氧烷的（Admira/Admira Bond）、基于硅烷的（Filtek P90/P90系统粘结剂）和基于甲基丙烯酸酯的（Tetric Ceram/Excite）。在聚合后以及水老化和热循环1个月和1年后立即评估边缘适应性。在金相显微镜下进行评估，记录无间隙修复的频率、最大边缘间隙（MG）的宽度、脱粘边缘相对于洞周边的长度百分比（DM）以及边缘指数（MI = MG×DM/100）。结果采用双向方差分析和α = 0.05时的Tukey检验进行统计学分析。
在所检查的任何老化时间，复合/粘结系统均未表现出无间隙修复。边缘适应性受修复/粘结系统类型的显著影响，而水老化时间没有显著影响。硅烷复合修复体的MG、DM和MI值最低，而甲基丙烯酸酯复合修复体的值最高。有机硅氧烷修复体显示出中间值。
尽管所有检查的复合系统与牙本质洞均未实现无间隙边缘，但基于硅烷的系统在所有老化时间均显示出最佳的边缘适应性。
