Abstract: Objective: To investigate the influence of customized transparent silicon rubber template on the microleakage of the composite resin inlays in conservative restoration of the anterior teeth. Methods: Thirty healthy extracted anterior teeth were selected and were randomly divided into three groups (group A, group B, and group C), and Class Ⅳ cavity was prepared on each tooth. Group A were restored with composite resin inlays directed by customized transparent silicon rubber template, group B were directed by traditional silicone impression template, and group C was restored directly by composite resin and all-etching bonding system. Composite resin inlays in group A were bonded to the teeth under the direction of customized transparent silicon rubber template. After thermal cycling and dying, all the specimens were examined by stereomicroscope. Results: The microleakage existed in all three groups. The microleakage values of group A and group B were less than that of group C (P<0.05). The microleakage value of group A was slightly lower than that of group B but without significant difference. Conclusion: The customized transparent silicon rubber template could reduce microleakage value between restoration and tooth.

Key words: Transparent silicon rubber, Aesthetic guide template, Conservative restoration, Microleakage