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目的:评估含8%精氨酸的脱敏牙膏与含0.8%精氨酸的脱敏漱口液对玻璃陶瓷和牙本质间微拉伸粘接强度及粘接界面的影响。方法:选择10颗正畸减数离体牙,去除牙合面釉质,暴露牙本质后,沿近远中向纵行切割分成3等分,依照牙本质处理方式的不同分为脱敏牙膏组,脱敏漱口液组及对照组。用Rely XTM Unicem 2自混自粘接树脂水门汀将牙本质面与玻璃陶瓷瓷块粘接。24 h后,将试件制备成横截面为1.0 mm×1.0 mm的试件,用微拉伸仪测定粘接强度,用体式显微镜观察断裂类型,并用扫描电子显微镜观察粘接界面。结果:脱敏牙膏组(16.15±3.37)MPa和脱敏漱口液组(15.29±3.05)MPa微拉伸强度小于对照组(20.82±4.17)MPa(P<0.05),脱敏牙膏组和脱敏漱口液组之间无显著性差异(P>0.05)。扫描电镜显示,对照组有树脂突深入牙本质小管,脱敏牙膏与脱敏漱口液组均无树脂突伸入牙本质小管。结论:含8%精氨酸的牙膏与含0.8%精氨酸的漱口液均可通过影响树脂突的形成降低玻璃陶瓷与牙本质的微拉伸粘接强度。
OBJECTIVE: To evaluate the effect of desensitizing toothpaste containing 8% arginine and desensitizing gargle containing 0.8% arginine on microtensile bond strength and bonding interface between glass ceramics and dentin. Methods: Ten orthodontic teeth were selected to remove the enamel of the occlusal surface. After the dentin was exposed, it was cut into 3 equal parts along the longitudinal and longitudinal cuts. The dentifrice group was divided into three groups according to the dentin treatment: , Desensitization gargle group and control group. Bonding the dentin surface to the glass ceramic tile with Rely XTM Unicem 2 self-adhesive resin cement. After 24 h, the test piece was prepared into a specimen with a cross section of 1.0 mm × 1.0 mm. The bond strength was measured with a micro-extensometer. The fracture type was observed with a stereomicroscope and the adhesion interface was observed with a scanning electron microscope. Results: The microtensile tensile strength of desensitized toothpaste group (16.15 ± 3.37) MPa and desensitization gargle group (15.29 ± 3.05) MPa was less than that of the control group (20.82 ± 4.17) MPa (P <0.05) There was no significant difference between the sensitive mouthwash groups (P> 0.05). Scanning electron microscopy showed that the control group had a resin protruding into the dentinal tubule, and both the desensitization toothpaste and the desensitizing gargle group did not protrude into the dentinal tubule. CONCLUSION: Both toothpaste containing 8% arginine and mouthwash containing 0.8% arginine can reduce the microtensile bond strength between glass ceramic and dentin by affecting the formation of resin protrusions.