間接レジンコアビルドアップと象牙質との接着強度に及ぼすNaOCl処理の影響．

Effect of NaOCl treatment on bond strength between indirect resin core-buildup and dentin.

• Satoshi Inoue
• Yasuhiro Murata
• Hidehiko Sano
• Toshiaki Kashiwada

抄録

本研究の目的は，次亜塩素酸（NaOCl）ゲルを用いた場合と用いない場合の間接レジンコアと処理した象牙質との接着強度を検討することであった。抜歯された根管が鈍角化したヒト大臼歯5例を用いてポストスペースを作製し，石膏模型上に間接レジンコアを作製した．次いで、象牙質表面をＮａＯＣｌの有無にかかわらず処理し、次いで、レジンコアをキャビティ内に溶着させた。37℃の水中で24時間保存した後，根および冠状象牙質との接着強さを測定するために試験片を切片化し，微小引張接着強さ（MTBS）試験を実施した．二元配置のANOVAにより，NaOCl処理と象牙質領域の両方の要因でMTBSに有意な差が認められた．以上のことから，間接レジンのコアビルドアップにおいては，NaOClゲルを象牙質に適切に使用することで接着強度を向上させることが可能であると結論づけた．

The aim of this study was to investigate the bond strength between indirect resin core-buildup and dentin treated with or without hypochlorite (NaOCl) gel. The post-space was made in five extracted human molars with obturated root canals, and the indirect resin core was produced on a gypsum model. Then, the dentin surface was treated with/without NaOCl, followed by luting of the resin core into the cavity. After storage for 24 h in 37 degrees C water, the specimens were sectioned for measuring bond strength to the root and coronal dentin, and were subjected to micro-tensile bond strength (MTBS) testing. Two-way ANOVA showed that significant differences in MTBS were revealed for both factors of NaOCl treatment and dentin region. It is concluded that, for indirect resin core-buildup, the proper use of the NaOCl gel to dentin could increase the bond strength.