UltraEZTM脱敏处理对牙本质黏接强度及微观形态的影响

目的 观察UltraEZ^TM脱敏处理对牙本质黏接强度及微观形态的影响。方法 以90颗第3磨牙进行体外研究，随机分为A组、B组与对照组，各30颗。A组应用UltraEZ^TM进行脱敏处理，B组应用MI Paste进行脱敏处理，C组不予脱敏处理。后将3组均分为2个亚组，每组15颗。两个亚组分别应用全酸蚀黏接剂与自酸蚀黏接剂进行黏接。比较3组全酸蚀黏接剂与自酸蚀粘接剂黏接后的牙本质及牙釉质黏接强度，比较3组试件的断裂模式。并用扫描电镜对3组与黏接剂黏接后的界面微观形态进行观察。结果 A组全酸蚀黏接剂与自酸蚀黏接剂的牙本质黏接强度与牙釉质黏接强度均高于B组（P<0.05），与对照组相当（P>0.05）。对照组的全酸蚀黏接剂及自酸蚀黏接剂的断裂模式均以C型（66.67%、73.33%）为主，部分为B型（33.33%、26.67%）断裂；A组以C型（46.67%、53.33%）为主，部分为A型及B型断裂；B组以B型断裂（60.00%、73.33%）为主，部分为A型及C型断裂。3组试件断裂模式分布的差异有统计学意义（P<0.05）。结论 UltraEZ^TM脱敏剂的应用未对牙本质黏接强度造成明显影响，且微观形态与未处理的牙本质黏接界面接近，值得推广应用。

Effect of UltraEZTM Desensitization on Dentin Bonding Strength and Micro-morphology

Objective To observe the effect of UltraEZ^TM desensitization on dentin bonding strength and microstructure.Methods In vitro studies were performed with 90 third molars, which randomly divided into group A, group B and control group, with 30 particles in each group. Group A was treated with UltraEZ^TM for desensitization, group B was desensitized with MI paste, and Group C was not desensitized. Than the three groups were divided into two subgroups, each of 15 particles. Two subgroups were coated with full acid etching adhesive and self-etching adhesive. The bonding strength of dentin and enamel after bonding with three self-etching adhesives, the fracture patterns of the three groups were compared. The microstructures of the interface were observed by scanning electron microscopy.Results The dentin bonding strength and enamel adhesion strength by full acid etching adhesive and self-etching adhesive in group A were were higher than those in group B (P<0.05), and comparable to the control group(P>0.05). The fracture pattern of the total etching adhesive and self-etching adhesive in the control group were mainly C type (66.67%, 73.33%), partly B type (33.33%, 26.67%).In Group A,there were mainly C type (46.67%, 53.33%), partly A-type and B-type fracture.In B group,there were with B-type fracture (60.00%, 73.33%) mainly, part of A-type C-type fracture. The distribution of fracture pattern in the three groups was statistically significant (P<0.05).Conclusion The application of UltraEZ^TM desensitizer did not significantly affect dentin bonding strength, and the microscopic morphology was close to that of untreated dentin, which was the first choice for desensitization.