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審美修復用CAD-CAM材料の微小硬度と曲げ強度に及ぼす模擬胃酸の影響
Effect of simulated gastric acid on aesthetical restorative CAD-CAM materials' microhardness and flexural strength.
PMID: 37929527
抄録
背景:
逆流性食道炎や神経性過食症の患者においては、腐食性物質の一つである胃酸が徐々に口腔内に上昇し、歯科修復物に様々な影響を及ぼす。
BACKGROUND: Gastric acid, which is among erosive substances, gradually rises to the mouth in individuals with reflux and bulimia nervosa disorders, and this causes various effects on dental restorations.
研究の目的:
本研究の目的は、審美修復用CAD-CAM材料の曲げ強度と硬度に及ぼす胃酸の影響をin vitroで検討することである。
AIM: The objective of this study is in vitro investigation of gastric acid's effect on flexural strength and hardness on aesthetic restorative computer-aided design and computer-aided manufacturing (CAD-CAM) materials.
材料と方法:
本研究では、Enamic（Vita社製）、Superfect Zir（Aidite社製）ジルコニア、IPS e.max CAD（Ivoclar Vivadent社製）、Mark II（Vita社製）の4種類の材料を使用した。これら4つの異なる材料から、14×4×1寸法の直方体のサンプルを24個使用し、合計96個のサンプルを作製した。1群を対照群として分け、残りは37℃、5mlの胃酸で96時間待機させた。硬度と曲げ強度は、胃酸に暴露する前と後で測定した。
MATERIALS AND METHODS: For this study, four materials have been used, namely Enamic (Vita), Superfect Zir (Aidite) Zirconia, IPS e.max CAD (Ivoclar Vivadent), and Mark II (Vita). From these four different materials, 24 samples with 14 × 4 × 1 dimensions in rectangular prism form are used, which makes a total of 96 samples. One group was separated as the control group, while the rest was allowed to wait at 37°C, 5 ml gastric acid for 96 hours. Hardness value and flexural strengths were measured as pre-exposure and post-exposure to gastric acid.
結果:
胃酸暴露後の平均硬度は、暴露前と比較して統計的に有意な差がみられた（p: 0,000; P < 0,05）。曝露前の値と比較した曝露後の平均曲げ強さの減少量については、群間に統計的有意差はなかった（p：0.063；P＞0.05）。酸に暴露した後の平均曲げ強さに関しては、群間で統計的に有意な差があった。
RESULTS: There is a statistically significant difference between the groups in terms of the amount of decrease in the mean hardness after exposure to gastric acid compared to pre-exposure values (p: 0,000; P < 0,05). There was no statistically significant difference between the groups in terms of the amount of decrease in the post-exposure average flexural strength compared to the pre-exposure value (p: 0.063; P > 0.05). There is a statistically significant difference between the groups in terms of the average flexural strength after exposure to the acid.
結論:
得られたデータによると、胃酸への暴露は歯科修復用セラミック材料の硬度と曲げ強さの特性に影響を及ぼすと結論づけられた。
CONCLUSIONS: According to the data obtained, it was concluded that exposure to gastric acid affects the hardness and flexural strength properties of dental restorative ceramic materials.