垂直歯根破折を起こした根の破折抵抗性に及ぼすスーパーボンドC&Bと自己接着性デュアルキュアレジンセメントの影響

Effect of Super-Bond C&B and self-adhesive dual-cured resin cement on the fracture resistance of roots with vertical root fracture.

抄録

垂直性歯根破折は，根管形成，咬合固定，後処置，または歯内療法中に発生する可能性がある． 標準的な長さを得るために，単根のヒト歯54本を装飾した．根管は#50まで拡大し、ガッタパーチャと根管シーラーで封鎖した。18歯を対照群とし、残りの歯に垂直歯根破折を誘導した。試料を無作為に3群に分け，コントロール群（垂直歯根破折なし），スーパーボンドC&B群（断片をスーパーボンドC&Bで接着），自己接着性デュアルキュアレジンセメント群（断片を自己接着性デュアルキュアレジンセメントで接着）とした．各試験片を破壊抵抗試験に供し，カイ二乗検定，一元配置分散分析，Tukey検定（P=0.05）を用いてデータを統計的に分析した． コントロール群およびスーパーボンドC&B群の破壊抵抗値は，自己接着性デュアルキュア型レジンセメント群よりも高かった（P<0.05）．しかし，コントロール群とスーパーボンドC&B群の間に有意差は認められなかった（P>0.05）． 本研究の限界の範囲内で，スーパーボンド C&B は，歯内療法で治療された垂直性歯根破折を有する歯根において，より高い破折抵抗を得るのに有益であった．

Vertical root fracture might occur during root canal preparation, obturation, post procedures or endodontic treatment. Fifty-four single-rooted human teeth were decoronated to obtain a standardized length. The root canals were enlarged up to #50 and obturated with gutta-percha and root canal sealer. Eighteen teeth were used as a control group, and vertical root fracture was induced in the remaining teeth. The samples were randomly divided into three groups, as follows: control group (without vertical root fracture), Super-Bond C&B group (fragments were attached with Super-Bond C&B), and self-adhesive dual-cured resin cement group (fragments were attached with self-adhesive dual-cured resin cement). Each specimen was subjected to a fracture resistance test, and data were statistically analyzed using chi-squared test, one-way ANOVA and post hoc Tukey tests (P=0.05). The fracture resistance values of the control and Super-Bond C&B groups were higher than those of the self-adhesive dual-cured resin cement group (P<0.05). However, there were no significant differences between the control and Super-Bond C&B groups (P>0.05). Within the limitations of the present study, Super-Bond C&B was beneficial in obtaining higher fracture resistance in endodontically treated roots with vertical root fracture.