日本語AIでPubMedを検索
接合面輪郭の異なるヒートキュアデンチャーベースの横強度評価．研究.
Evaluation of Transverse Strength of Heat Cure Denture Bases Repaired with Different Joint Surface Contours: An Study.
PMID: 32381822
抄録
ＡＩＭ:
本研究では，ガラス繊維強化自己硬化型補修材を用いた3種類の接合面デザインと表面前処理を用いて補修したアクリル系熱硬化型義歯床レジンの横強度を評価した．
AIM: The present study aimed to evaluate the transverse strength of heat cure acrylic denture base resins repaired with three different joint surface designs, repair material being the glass-fiber-reinforced self-cure repair material along with surface pretreatment.
材料および方法:
熱硬化性レジンは合計40本作製し，64mm×10mm×2.5mmのサイズに仕上げた．これらの試験片を、対照群と一緒に、それぞれ突合せ面接合部、丸面接合部、開先補修面接合部を有する１０個ずつの４群に分けた。補修手順を進めるために試験片を途中で切断した後、前記接合面輪郭をそれぞれＩ群、II群、III群について作成し、塩化ジメチルで３０秒間処理し、Ｅ-ガラス繊維強化自己硬化補修材で補修を行った。
MATERIALS AND METHODS: A total of 40 heat cure resin specimens were fabricated and finished to a size of 64 mm × 10 mm × 2.5 mm. These specimens were divided into four groups of 10 each, with butt, round, and bevel repair surface joints, respectively, along with the control group. After the specimens were cut in the middle for the repair procedure to proceed, the aforementioned joint surface contours were prepared for groups I, II, and III, respectively, treated with dimethyl chloride for 30 seconds, and the repair was done with E-glass-fiber-reinforced self-cure repair material.
結果:
対照群の平均横強度は100.37Nが最も高く（有意値<0.05）、次いでIII群（ベベルジョイント）54.23N、I群（バットジョイント）53.93N、II群（ラウンドジョイント）44.55Nであった。
RESULTS: The mean transverse strength of the control group was 100.37 N, which was highest (significant value of <0.05), followed by group III (bevel joint) 54.23 N, group I (butt joint) 53.93 N, and group II (round joint) 44.55 N.
結論:
本研究では，45°ベベルジョイントが，有望な修復材料および表面前処理とともに適切な選択であることを示した．
CONCLUSION: Distribution of stresses evenly in the repair region will be achieved by the proper selection of the joint surface contour, and this study showed that the 45° bevel joint was an appropriate selection along with promising repair material and surface pretreatment.
臨床的意義:
臨床的には、折れた義歯を修復する場合、修復された義歯の十分な横強度を維持するためには、物理的・機械的特性に優れ、迅速かつ経済的に便利な材料が重要である。ガラス繊維強化自己重合レジンは，破折面の45°ベベルジョイント設計と表面前処理により応力集中を低減し，修復された熱硬化義歯基材レジンの横強度を向上させることが確認された．
CLINICAL SIGNIFICANCE: Clinically, in the event of repairing a broken denture, a rapid and economically convenient material with superior physical and mechanical properties is important to maintain the adequate transverse strength of the repaired denture. Glass-fiber-reinforced autopolymerizing resin, with a 45° bevel joint design of the broken surfaces and surface pretreatment proved to reduce stress concentration, improving the transverse strength of the repaired heat cure denture base resins.