다양한 레진시멘트로 합착한 섬유포스트의 결합강도 비교

Abstract

The purpose of this study was to compare the push-out strength of a fiber post cemented with various resin cements. Newly extracted 36 human mandibular premolars which had single root canal were selected for this study. Their crown portion was removed with a water-cooled diamond wheel saw. The root canal was instrumented using PROTAPER system and obturated using continuous wave technique. In each endodontic treated root, a 9-㎜ deep post space was prepared. #2 translucent fiber post (DT Light post, Bisco) was cemented using injection technique with Uni-does needle tip (Bisco) and six different resin cements. The tested resin cements were Duo-Link (Bisco), Variolink II (Ivoclar-Vivadent), Panavia F (Kuraray Co.), Multilink Automix (Ivoclar-Vivadent), RelyX Unicem (3M ESPE), and Maxcem (Kerr Co.). After storage in distilled water for 24 hours, each root was transversally sectioned into approximately 1-㎜ thick sections using a low speed diamond saw under constant water cooling. This procedure resulted in 6 serial sections or slices per root. Push-out test was performed using a universal testing machine (EZ Test, Shimadzu Co.) with a crosshead speed of 1 ㎜/min. The data were analyzed with one-way ANOVA and Tukey HSD (p=0.05). The push-out strength of the groups which cemented fiber post with Panavia F and Multilink Automix were lower than that of the other groups. But, there were no statistically significant difference among groups at a probability level of 0.05. Several factors may influence cementation of the endodontic posts into the canal. Within the limitations of this in vitro study, there were no significant difference among the push-out strengths obtained each group. Therefore, the use of resin cement using simplified adhesive system and injection technique for cementation allow clinician to cement the fiber post into the root canal more conveniently.