Arab M, Al-Sarraf E, Al-Shammari M, Qudeimat M
1Ministry of Health, Al-Ahmadi Governorate, P.O. Box: 24923, 13110, Safat, Kuwait.
Department of Restorative Sciences, Faculty of Dentistry, Kuwait University, Kuwait, Kuwait.
Eur Arch Paediatr Dent. 2019 Feb;20(1):47-51. doi: 10.1007/s40368-018-0384-2. Epub 2018 Nov 7.
To compare the microshear bond strength of resin based composite (RBC) and resin modified glass ionomer cement (RMGIC) restorations when bonded to teeth with molar incisor hypomineralisation (MIH).
Eleven first permanent molars with MIH were included in this study. Teeth were sectioned mesio-distally producing a total of 22 surfaces for testing. Each specimen was placed inside a plastic ring with the flattened surface in contact with a glass slab. The plastic ring was filled with autopolymerising acrylic resin to imbed the specimen leaving the enamel surface exposed. Each surface was then bonded to 0.96 mm diameter RBC and light cured RMGIC following the manufacturers' instructions. Microshear bond testing was performed after 24 h storage in distilled water at 37 °C. A Bisco shear tester was used to apply shear stress of 1 mm/min until failure. Wilcoxon signed-rank paired-test was used for comparison of bond strength values.
Microshear bond strength of RBC (30.80 ± 8.19 MPa) was significantly higher than that of RMGIC (11.13 ± 6.91 MPa) when bonded to hypomineralised permanent first molars (p < 0.001).
The microshear bond strength of RBC is significantly higher than that of RMGIC when bonded to MIH affected teeth. Therefore, RBC can be recommended as the restoration of choice for teeth with MIH whenever the clinical scenario allows.
比较树脂基复合材料（RBC）和树脂改性玻璃离子水门汀（RMGIC）修复体与患有磨牙切牙矿化不全（MIH）的牙齿粘结时的微剪切粘结强度。
本研究纳入了11颗患有MIH的第一恒磨牙。将牙齿近远中向切片，共获得22个用于测试的表面。每个标本放置在一个塑料环内，其扁平表面与一块玻璃板接触。向塑料环中填充自凝丙烯酸树脂以包埋标本，使牙釉质表面暴露。然后按照制造商的说明，将每个表面分别与直径0.96毫米的RBC和光固化RMGIC粘结。在37℃蒸馏水中储存24小时后进行微剪切粘结测试。使用Bisco剪切测试仪以1毫米/分钟的速度施加剪切应力直至破坏。采用Wilcoxon符号秩配对检验比较粘结强度值。
当与矿化不全的第一恒磨牙粘结时，RBC的微剪切粘结强度（30.80±8.19兆帕）显著高于RMGIC（11.13±6.91兆帕）（p<0.001）。
当与受MIH影响的牙齿粘结时，RBC的微剪切粘结强度显著高于RMGIC。因此，只要临床情况允许，RBC可被推荐为MIH患牙的首选修复材料。
