Clinical Observation of Improvement of Class II Cavity sandwich Filling Technique

TANG Ji-ping; CHEN Jian; SUN Ye-qing

doi:10.3969/j.issn.1672-2973.2014.04.012

Abstract：Objective: To simplify the traditional Class II cavity sandwich filling technique and to prevent the postoperative sensitivity and secondary caries in the gingival walls. Methods:267 out patients’ 300 involved teeth that met the inclusion criteria were randomly divided into experimental group I, experimental group II and the control group. In the experimental group I, the cavities were treated with light cured RMGIC on the whole inner walls and directly filled with composite resins without etching and bounding. In the experimental group II, the RMGIC used in the experimental group I was further strengthened by adding the composite resin (half of the composite resin was put deeply inside the RMGIC and the other half was exposed in the cavity). In the control group, traditional filling methods were used. The patients were recalled and evaluated after 12 months. Results:In the experimental groups, no separation occurred in the boundary surface between the composite resin and the RMGIC. In the experimental group I, 4 teeth showed secondary caries in the gingival walls, another tooth exhibited marginal sealant defect, 1 other teeth showed marginal discoloration, and 1 restoration dropped out (success rate:92.47%);In the experimental group II, one restoration dropped out, 1 tooth exhibited marginal sealant defect, 2 other teeth showed marginal discoloration (success rate: 95.79%); In the control group, 4 teeth showed postoperative sensitivity, 4 teeth exhibited secondary caries in the gingival walls, 1 restoration dropped out, 1 tooth showed marginal sealant defect, 2 teeth exhibited marginal discoloration (success rate: 86.96%). The difference between the experimental group II and the controlled group was statistically significant (P<0.05). And no statistically significant difference was found between the experimental group I and the controlled group (P>0.05). Conclusion:The RMGIC and the composite resin used in the experimental groups can be firmly combined. Compared with the technique used in the control group, the method adopted in the experimental group I can simplify the operation and avoid postoperative sensitivity, but cannot help prevent secondary caries in the gingival walls. When the 2 methods used in the experimental group II and the control group were compared, the former can simplify the operation, avoid postoperative sensitivity, as well as avoid secondary caries in the gingival walls.