处理时间对成熟恒牙和年轻恒牙应用通用型粘接剂时牙本质粘接效果的影响
Effects of bond strength evaluation on different durations of adult permanent teeth and youth permanent teeth by using universal adhesives to dentin
作者：孙源,刘鹤,孙志辉
Author：Yuan Sun,He Liu,Zhihui Sun
收稿日期：2018-03-05 年卷（期）页码：2018,36(5):482-482-487
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：年轻恒牙,成熟恒牙,粘接强度,通用型粘接剂,
Key words：youth permanent teeth,adult permanent teeth,bonding strength,universal adhesives,
基金项目：
中文摘要
目的 应用通用型粘接剂Scotchbond Universal（SBU）,比较在不同处理时间下对成熟恒牙与年轻恒牙牙本质粘接的粘接强度,探讨其应用于年轻恒牙的效果。方法 收集成熟恒牙与年轻恒牙各10颗,去除牙合面釉质层,平行于牙体长轴将牙齿切为3块,获得成熟恒牙30块,年轻恒牙30块,各随机分为3组,自凝树脂包埋,分别采用通用型粘接剂SBU处理10、20、30 s,粘接后采用万能试验机检测其微剪切粘接强度,并在体视显微镜下观察粘接断面,确定断裂模式。另取成熟恒牙与年轻恒牙各2颗,同样方法分组,荧光素0.1% Rhodamine B溶解于SBU粘接剂中,分别处理10、20、30 s,粘接后采用激光共聚焦显微镜（CLSM）观察各组粘接面树脂突的微观形态。结果 成熟恒牙：20 s组及30 s组微剪切强度最大,二者间差异无统计学意义（P>0.05）,但均显著高于10 s组（PPPP>0.05）。成熟恒牙20 s组与年轻恒牙20 s组间差异无统计学意义（P>0.05）,而成熟恒牙30 s组粘接强度显著高于年轻恒牙30 s组（P结论 临床使用SBU时,年轻恒牙可适当缩短粘接剂处理时间,而成熟恒牙的处理时间不低于20 s。
英文摘要
ObjectiveTo compare the dentin bonding strength evaluation between adult permanent teeth and youth per-manent teeth after treatment for different durations by universal adhesives.MethodsTen adult permanent teeth and ten youth permanent teeth were selected for this study. The occlusal enamel layer was removed, and each tooth was cut into three pieces along the long axis. In total, 30 pieces of adult and youth teeth were prepared. The adult and youth teeth pieces were randomly divided into three groups and treated by universal adhesives for 10, 20, and 30 s. In this study, Scotchbond Universal (SBU) was selected as the universal adhesive. Slabs were treated by dual-cure resin cements. The specimens were tested by micro-shear strength test through a universal testing machine. Fracture modes were observed by a stereomicroscope. Other adult teeth and youth teeth were selected, two for each type, and treated and grouped in the same manner. Fluorescein (0.1% Rhodamine B) was dissolved in SBU adhesive, and the specimens were treated by the adhesives for 10, 20, and 30 s. Micromorphology of the resin protrusions on the adhesive surface was observed by laser confocal microscopy (CLSM).ResultsFor the adult teeth, the highest micro-shear bonding strength was observed in the 20 and 30 s groups, and the values were higher than that of the 10 s group (PPPP>0.05). The main break patterns in different groups comprised adhesive failure fractures and several mixed failure fractures. No resin fracture mode was observed. CLSM revealed very few short resin protrusions in 10 s adult teeth group, whereas the number and length of resin protrusions significantly increased in the 20 s adult teeth group. The resin protrusions of the 30 s group were shorter than those of the 20 s adult teeth group. In different durations, the bonding interface in different youth teeth groups presented the same trend of change as the adult teeth. However, the number and length of resin protrusions in the 10 s group of youth teeth were all higher than those of the 10 s adult teeth group.ConclusionIn clinical practice, the bonding agent treatment duration shall be shortened appropriately for youth permanent teeth, and that for adult permanent teeth shall not be shortened to less than 20 s. On the whole, the bond strength of youth permanent teeth can achieve no significant difference with the adult permanent teeth.
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