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修復された義歯床用レジンの横断強度に及ぼす接合面調製剤および化学的表面処理の影響．
The Effect of Joint Surface Preparations and Chemical Surface Treatment on the Transverse Strength of Repaired Denture Base Resin.
PMID: 35017918
抄録
研究目的:
本研究の目的は，修復された義歯床用レジンの横断強度に及ぼす接合面処理および接合面処理に施された化学的表面処理の影響を検討することである．
Aim: The aim of the study is to investigate the effect of joint surface preparations and chemical surface treatment given to prepared surface on the transverse strength of repaired denture base resin.
研究方法:
220個の試験片（DPI India）を，接合面処理（Butt Joint，45° bevel，Rounded Joint）および化学的表面処理（塩化メチレン，酢酸エチル，メタクリル酸メチル）の組み合わせによって8群（=10）に無作為に振り分けた．表面処理後の試験片は，自己硬化型樹脂（DPI India）で補修した後，3点曲げ試験を行い，横方向の強度を測定した。破断面は実体顕微鏡で観察し，AutoCADで解析して破断の種類（接着性，凝集性）を判定し，その面積を測定した．測定データは，一元配置分散分析，対検定，DunnettのD検定，および多重比較Bonferroni検定により，5%の有意水準で分析した。
Methodology: Two hundred and twenty specimens (DPI India) were randomly allocated into eight groups ( = 10), according to the combination of joint surface preparation (Butt joint, 45° bevel, and rounded joint) and chemical surface treatment (methylene chloride, ethyl acetate, and methyl methacrylate) for 30 and 60 s each. Specimens, after surface treatment, were repaired with self-cured resin (DPI India) and then subjected to 3-point bending test to measure transverse strength. Fractured surfaces were viewed under stereomicroscope and subjected to AutoCAD analysis to determine type of failure (adhesive or cohesive) and measure their area. Measurement data were analyzed by one-way analysis of variance, paired -test, Dunnett's D test, and multiple comparison Bonferroni -test, with a 5% significance level.
結果:
試験片間の比較のほとんどは統計的に有意であった。試験片（塩化メチレン60秒，丸みを帯びた継手）は60%-70%の強度増加を示した．
Results: Most of the comparisons between the test specimens were statistically significant. Specimens (methylene chloride for 60 s and rounded joint) show 60%-70% gain of strength.
結論:
補修材の接着強度を向上させるためには，破断した試験片のセグメントを塩化メチレンで60秒間エッチングし，「Rounded Joint」調製を行うことが必要である．
Conclusions: For providing better bond strength to a repaired specimen, the segment of fractured specimens to be provided "Rounded joint" preparation with etching by methylene chloride for 60 s.