摘要
目的 :评价唾液污染对运用自酸蚀粘接系统托槽 /牙面剪切强度的影响。方法 :根据牙面不同污染情况分为 4组 :A组 :牙面清洁干燥 ;B组 :牙面在涂布酸性封闭剂之前受唾液污染 ;C组 :牙面在涂布封闭剂之后受唾液污染 ;D组 :牙面在封闭剂涂布前后均受唾液污染。所有样本均用光固化粘接剂 (TransbondXT 3M )粘接托槽。粘接 0 .5h后比较 4组的剪切强度及粘接剂残留指数 (ARI)。结果 :4组剪切强度存在显著性差异 (F =11.89,P <0 .0 5 )。D组剪切强度 (4 .62 86± 1.6883MPa)明显低于A组 (8.75 48± 1.915 3MPa) ,B组 (7.895 1± 1.9692MPa)和C组 (6.90 10± 1.5 162MPa)。B组和C组虽有所下降 ,但仍在临床可接受范围之内。 4组粘接剂残留指数比较无显著性差异。结论 :即使在轻微污染的环境中 (牙面在封闭剂涂布之前或之后受唾液污染 ) ,自酸蚀封闭剂也能进行有效的粘接。
Objective:The purpose of this study was to assess the effect of saliva contamination on the shear bond strength of orthodontic brackets using a new self-etching primer. Method:The samples were divided into four groups according to four different enamel surface conditions: Group A: dry; Group B: saliva contamination before priming; Group C: saliva contamination after priming, and Group D: saliva contamination before and after priming. Stainless steel brackets were bonded in each test group with a light-cured composite resin (TransbondXT 3M).The shear bond strength and the adhesive remnant index (ARI) were determined in the first 30 minutes after bonding.Result:The shear bond strengths of the four groups were significantly different(F=11.89,P<0.05). Group D, the most contaminated, had a significantly lower shear bond strength(4.6286±1.6883 MPa) than either the control group(8.7548±1.9153MPa) or the groups where contamination occurred either before(7.8951±1.9692MPa) or after(6.9010±1.5162 MPa) the application of the primer. No significant differences in ARI scores were found among the four groups. Conclusion:The new self-etching primer can maintain adequate shear bond strength if contamination occurs either before or after the application of the primer. On the other hand, contamination both before and after the application of the primer significantly reduced the shear bond strength of orthodontic brackets.
出处
《临床口腔医学杂志》
2005年第1期49-51,共3页
Journal of Clinical Stomatology