牙备和黏接剂对金属全冠黏固效果的影响

目的：了解牙体预备及不同黏接剂对金属全冠黏固效果的影响，为全冠修复的临床操作提供研究依据。方法将60颗离体磨牙采用简单随机化法随机分为六组，每组10颗。每组采用的黏接材料不同或牙体预备的轴壁聚合度不同，分别为磷酸锌3度聚合组、玻璃离子3度聚合组、树脂水门汀3度聚合组、磷酸锌5度聚合组、玻璃离子5度聚合组、树脂水门汀5度聚合组。以上前三组牙备轴壁聚合度为3度，后三组牙备轴壁聚合度为5度。测试和比较每组的的固位力值。结果磷酸锌3度聚合组金属全冠固位力为（198.5±11．6）N，显著优于磷酸锌5度聚合组（138．2±14．1）N（t＝7．46，P＜0．05）。玻璃离子组和树脂水门汀组牙体预备轴壁聚合度3度或5度金属全冠固位力差异均无统计学意义（t＝1．52、2．03，均P＞0．05）。聚合度为3度组磷酸锌黏接固位力是（198．5±11．6） N，玻璃离子和树脂水门汀分别是（302．7±19．2） N和（352．7±21．8）N；聚合度为5度组磷酸锌黏接固位力是（138．2±14．1） N，玻璃离子和树脂水门汀分别为（317．4±23．8）N和（362．9±22．6）N，无论是何种牙备不同黏接剂金属全冠的固位力差异均有统计学意义（F＝7．88、8．42，均P＜0．05）。结论选择合适的黏接剂，规范操作才可获得最佳的黏固效果，提高临床修复效果。

Effect of tooth preparation and bonding agents on cementation of metal full crown

Objective To find out the effect of tooth preparation and bonding agents on cementation of metal full crown,to provide research basis for clinical practice of full crown restoration .Methods 60 dissociation teeth were randomly divided into six groups ,10 teeth in each group .Different adhesive materials or different polymerization angle were used in different groups ,the six groups were 3 polymerization angle zinc group ,3 polymerization angle glass ionomer group,3 polymerization angle resin cement group ,5 polymerization angle zinc group ,5 polymerization angle glass ionomer group ,and 5 polymerization angle resin cement group .In the first three groups ,polymerization angle was 3,and in the latter three groups ,polymerization angle was 5.The retentive force values of all groups were tested and compared.Results The metal crown retentive force of 3 polymerization angle zinc group[（198.5 ±11.6）N]was sig-nificantly better than that of 5 polymerization angle zinc group[（138.2 ±14.1）N]（t=7.46,P〈0.05）.Polymeriza-tion angle showed no statistically significant effect on metal crown retentive force values of glass ionomer groups and resin cement groups （t=1.52,2.03,all P〉0.05）.Bonding zinc retention of 3 degree of polymerization group was （198.5 ±11.6）N,glass ionomer and resin cements were （302.7 ±19.2） N and （352.7 ±21.8） N.Bonding zinc retention of 5 degree of polymerization group was （138.2 ±14.1）N,glass ionomer and resin cements were （317.4 ± 23.8）N and （362.9 ±22.6） N.Different adhesives showed statistically significant effects on metal crown retentive force values of 3 polymerization angle groups and 5 polymerization angle groups （F=7.88,8.42,all P〈0.05）. Conclusion A suitable adhesive,standard operation can get the best cementation effect ,and improve clinical repair effect.