四种树脂粘接剂与牙釉质和牙本质粘接性能的比较

目的 评价4种树脂粘接剂与牙釉质和牙本质的粘接强度以及粘接界面微观形态,以期为临床应用提供依据.方法 选取24颗新鲜拔除的无龋坏人磨牙,每颗牙制取牙釉质和牙本质试件各2片,均分为4组,每组牙釉质和牙本质试件各12片.选用4种树脂粘接剂(A组:PanaviaTMF;B组:RelyXTM ARC;C组:RelyXTM Unicem;D组:ClearfilTM SA Cement)进行粘接处理后,在扫描电镜(SEM)下观察粘接界面,并测试粘接强度.结果 B组牙釉质粘接强度(29.38±6.28)MPa]高于D组(27.25±7.03)MPa],但两者差异无统计学意义(P＞0.05),两者均显著高于A组(22.92±7.13)MPa]和C组(10.92±3.41)MPa,P＜0.05].B组牙本质粘接强度(27.28±6.79)MPa]最高,随后依次为A组(14.23±6.39)MPa]、D组(10.09±3.26)MPa]和C组(6.43±1.60)MPa],各组间差异均有统计学意义(P＜0.05).B组牙釉质粘接界面可见树脂突,A、B组牙本质粘接界面可见树脂突.结论 四种树脂粘接剂表现出不同的牙釉质、牙本质粘接性能.

Abstract：

Objective To evaluate the dentin and enamel bonding strength and resin-dentin interfaces of four resin cements. Methods Twenty-four sound freshly extracted molars were sectioned with low-speed saw under running water. Two mesial-distal enamel disc and two buccal-lingual dentin discs were sectioned from each molar. Four resin cements( A group: PanaviaTM F; B group: RelyXTM ARC; C group:RelyXTM Unicem; D group: ClearfilTM SA Cement) were applied to the surface of these enamel and dentin discs according to manufacturers' guidance. The bonded specimen were prepared for shear bond strength test and sectioned occluso-gingivally into two slabs for scanning electron microscopy(SEM) observation. Results The bonding strength between resin and enamel in B group (29. 38 ±6. 28) MPa] was higher than that in D group (27.25 ± 7.03) MPa], and both of them were significantly higher than those in A ( 22.92 ±7. 13) MPa] and C group ( 10.92 ± 3.41 ) MPa] ( P ＜ 0.05 ). The highest dentin bonding strength was shown in B group ( 27.28 ± 6. 79 ) MPa ], followed by A ( 14. 23 ± 6. 39 ) MPa ], D ( 10.09 ±3.26) MPa] and C group (6. 43 ± 1.60) MPa, P ＜ 0.05 ]. Conclusions The four resin cements have different enamel or dentin bonding properties.

A study on the bonding properties of four resin cements

Objective To evaluate the dentin and enamel bonding strength and resin-dentin interfaces of four resin cements. Methods Twenty-four sound freshly extracted molars were sectioned with low-speed saw under running water. Two mesial-distal enamel disc and two buccal-lingual dentin discs were sectioned from each molar. Four resin cements( A group: PanaviaTM F; B group: RelyXTM ARC; C group:RelyXTM Unicem; D group: ClearfilTM SA Cement) were applied to the surface of these enamel and dentin discs according to manufacturers' guidance. The bonded specimen were prepared for shear bond strength test and sectioned occluso-gingivally into two slabs for scanning electron microscopy(SEM) observation. Results The bonding strength between resin and enamel in B group (29. 38 ±6. 28) MPa] was higher than that in D group (27.25 ± 7.03) MPa], and both of them were significantly higher than those in A ( 22.92 ±7. 13) MPa] and C group ( 10.92 ± 3.41 ) MPa] ( P ＜ 0.05 ). The highest dentin bonding strength was shown in B group ( 27.28 ± 6. 79 ) MPa ], followed by A ( 14. 23 ± 6. 39 ) MPa ], D ( 10.09 ±3.26) MPa] and C group (6. 43 ± 1.60) MPa, P ＜ 0.05 ]. Conclusions The four resin cements have different enamel or dentin bonding properties.