Influence of Time to Tooth Preparation on Dentin Bond Strength of Resin Core
スポンサーリンク
概要
- 論文の詳細を見る
Purpose: This study was to compare the bonding strength of two kinds of directly built-up resin cores (Clearfil DC Core; Kuraray and Unifil Core EM; GC) that were prepared by the use of various setting times.Methods: Dentin of bovine teeth roots were used as experimental specimens. The dentin surface was polished smoothly, and an adhesive surface 3 mm in diameter was then lined with masking tape. A translucent acrylic tube 4 mm in diameter was fixed around the adhesive surface. The tube was 5 mm high and shielded around with putty to simulate the root canal. The composite resin was irradiated for 20 s and prepared. The time of tooth preparation was decided as follows: immediately, after the maker's designation time, 30 min, 1 h, 1 day, and 1 week later, and it was not prepared as the control. Six specimens were prepared for each condition, and bonding strength was measured by shear testing. The average measurement datum was calculated and analyzed by using two-way ANOVA and Tukey's test. Furthermore, the fractured section after shear testing was observed by SEM.Results: For both materials, the time of tooth preparation immediately, after the maker's designation time, and 30 min later showed significantly lower bonding strength (p < 0.05). No significant difference was observed among the conditions of those prepared after 1 h and those not prepared. Regarding the bonding strength between materials, a significant difference was not recognized under all conditions. Observation of the adhesion interface under the condition immediately after treatment showed interfacial failure and cohesive failure within the adhesive, but other conditions showed mostly mixed failure and cohesive failure within the resin.Conclusion: When building up the resin core in root canal length, we observed more than 5 mm under conditions of this experiment; thus the preparation of teeth should be carried out after 1 h or more.
- 社団法人 日本補綴歯科学会の論文
社団法人 日本補綴歯科学会 | 論文
- 臼歯部人口歯排列に考慮を要した総義歯補綴の1症例 : 術後7年経過症例
- 無歯顎症例における水平的下顎位と側頭筋前方部の筋膨隆との関係に関する研究
- 口蓋裂患者に対して可撤性局部床義歯を用いた補綴処置の一症例
- 咬合異常が発症因子と考えられる顎関節症の治療
- クラウンの保持力に関する研究 : レジンモディファイドグラスアイオノマーセメントのサーマルサイクルによる検討