Internal and marginal adaptation of self-adhesive and flowable composite resins

Abstract

Purpose This in vitro study evaluated the internal and marginal adaptability of different composite resins in class V cavities. Materials and methods Thirty human maxillary premolars were selected. Trapezoidal class V were prepared on buccal surface. Flowable, self-adhering flowable and nanohybrid composites were applied following their manufacture instructions, in groups I, II and III respectively. Specimens were subjected to 500 thermal cycles and then examined under a stereomicroscope to determine the marginal gap width. All specimens were then sectioned buccolingually into two sections to detect and measure the internal gap width. Results The highest mean value of occlusal gap was recorded for Group II followed by Group I while the lowest value was recorded in Group III. Similar results were found regarding the cervical margins, with no statistically significant difference between the groups. Comparing occlusal versus cervical marginal gap a highly significance difference was recorded in each group. The highest internal mean gap width was recorded in Group III, followed by Group II while the lowest in Group I, with no significant difference between them. Conclusion All tested materials showed satisfactory marginal adaptation with no significant benefits of the self-adhesive composite. The nano hybrid composite showed the best marginal adaptation while the flowable composite showed the best internal adaptation.