摘要
目的研究循环加载下不同树脂粘结剂在不同桩道深度中对纤维桩粘结强度的影响。方法选取2016年11月至2017年3月在平顶山学院第二附属医院因正畸需要而拔除的下颌单根管第一前磨牙60颗,经过完善的根管治疗及桩道预备后,按照随机数表法分为3组,分别用全酸蚀(A组)、自酸蚀(B组)和自粘结系统(C组)的粘结剂将纤维桩粘结于根管内,包埋后按照随机数表法将A、B、C组分别分为两个亚组,其中A1、B1、C1组作为对照组,A2、B2、C2组为观察组,观察组在包埋后接受300 000次的循环加载。牙根颈、中和下部各取2个厚为1 mm的薄片,用推出试验测试各试件的粘结强度。结果粘结系统、循环加载、桩道深度对纤维桩的粘结强度均有一定的影响,粘结系统与桩道深度间存在交互作用(F=152.147,P<0.05),循环加载与桩道深度间存在交互作用(F=8.140,P<0.05)。根颈部,C1组粘结强度(13.42±1.23)MPa高于A1组(13.26±1.19)MPa和B1组(10.41±1.22)MPa,B1组最小;根中部,C1组粘结强度(9.98±1.53)MPa高于A1组(4.31±0.93)MPa和B1组(9.17±1.12)MPa,A1组最小;根下部,B1组粘结强度(9.35±0.63)MPa高于A1组(2.24±0.71)MPa和C1组(5.86±0.72)MPa,A1组最小。结论自酸蚀粘结系统的粘结性能优于全酸蚀粘结系统和自粘结系统。
Objective To observe the effect of resin binder on the bonding strength of fiber post under cyclic loading. Methods Sixty human mandibular single root canal premolars which were extracted for orthodontic treatment in the Second Affil- iated Hospital of Pingdingshan University from November of 2016 to March of 2017 were enrolled in this study. All premolars were randomly divided into three groups after treated completely by endodontical therapy and preparation for post spaces, 20 cases in each group. The resin binder of total - etching adhesive system, self - etching adhesive system and self - adhesive system were used to bond fiber post with root canal respectively. The premolars in three groups were randomly divided into two subgroups re- spectively after embedded. Finally, there were three control subgroups and three observation subgroups, and the premolars in the observation groups A2, B2 and C2 were treated by cyclic loading for 300 000 times. Two slices which were cut off into 1 mm from the upside, middle part and the bottom of the root of teeth were used to test the bonding strength of fiber post measured by push -out test. Results Adhesive systems, cyclic loading and the depth of the post spaces were all related to the bonding strength of fiber post. Aadhesive systems and cyclic loading were correlated with the depth of the post spaces （ F1 = 152. 147, F2 =8. 140, P 〈0. 05）. The bonding strength of upside ones of group B1, A1, C1 were stronger in turn[ （ 10.41 ±1.22） MPa, （ 13. 26 ±1.19） MPa vs （ 13.42± 1.23） MPa ], the bonding strength of middle part ones of group A1, B1, C1 were stronger in turn[ （4. 31 ± 0. 93 ）MPa, （9. 17 ±1.12）MPa vs （9. 98 ＋ 1.53 ）MPa ], and the bonding strength of bottom ones of group A1, C1, B1 are stronger in turn[ （2.24 ± 0. 71） MPa, （5.86±0.72）MPa vs （9.35 ±0.63）MPa]. Conclusion The bonding strength of self - etch system under cyclic loading is stronger than that of self - adhesive system and total - etch system.
出处
《河南医学研究》
CAS
2017年第23期4225-4228,共4页
Henan Medical Research
基金
国家自然科学基金青年科学基金项目(8150031112)
河南省科技攻关项目(142102310356)
