Beyond冷光美白对树脂—牙釉质微拉伸强度及树脂边缘微渗漏影响的研究
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摘要
目的
探讨Beyond冷光美白前及美白后不同时期树脂-牙釉质的微拉伸强度,粘结界面的微观形态,评价V类洞边缘微渗漏情况,确定Beyond冷光美白后进行复合树脂粘结修复的最佳时期。
方法
1.万能材料试验机测试Beyond冷光美白前、美白后即刻、美白后储存于人工唾液1周,2周,3周后进行树脂粘结的树脂-牙釉质微拉伸强度。
2.扫描电镜观察各组树脂-牙釉质界面的微观形态。
3.染料渗漏法评估Beyond冷光美白前、美白后即刻、美白后储存于人工唾液1周、2周、3周后进行树脂充填的边缘微渗漏情况。
结果
1. Beyond冷光美白后即刻修复,树脂-牙釉质微拉伸强度显著降低(P<0.05)；分别储存于人工唾液1周、2周、3周后进行树脂修复,树脂-牙釉质微拉伸强度可恢复至漂白前水平(P>0.05),其中储存于人工唾液2周、3周后树脂修复,其微拉伸强度高于储存于人工唾液1周组,有统计学差异(P<0.05)；延迟2周、3周树脂修复,两组微拉伸强度无统计学差异(P>0.05)。
2.扫描电镜观察, Beyond冷光美白后即刻修复粘结界面存在缝隙,结合较差。随着储存于人工唾液中时间的延长,树脂突越来越清晰,粘结界面越来越致密。
3.微渗漏：①牙合壁：Beyond冷光美白后即刻树脂充填,与未漂白组相比边缘微渗漏明显增加(P<0.05)；漂白后储存于人工唾液1周、2周、3周后进行树脂充填,微渗漏与未漂白组相比无统计学差异(P>0.05)；储存于人工唾液1周后进行树脂充填,微渗漏与漂白后即刻相比无统计学差异(P>0.05)；储存于人工唾液2周、3周后进行树脂充填,微渗漏与漂白后即刻相比大大降低,有统计学差异(P<0.05)；储存于人工唾液2周、3周后进行树脂充填,微渗漏值无统计学差异(P>0.05)。②龈壁：各组微渗漏无统计学差异。③组内比较,各组龈壁微渗漏值均大于牙合壁微渗漏值,除未漂白组无统计学差异外(P>0.05),其余各组均存在统计学差异(P<0.05)。
结论
1. Beyond冷光美白后即刻,不适合对牙釉质进行树脂修复。
2. Beyond冷光美白前后龈壁微渗漏均高于牙合壁微渗漏。
3. Beyond冷光美白后1周,可进行牙釉质树脂修复,但最佳修复时机是漂白后2周。
Objective:
The purpose of this study was to investigate the effect of microtensile bond strength(uTBS) of composite resin to enamel before and after beyond tooth bleaching in differnet time;to observe the resin-enamel interface micromorphology of each group using a scanning electron microscope(SEM);to evaluate gingival microleakage of class V composite restorations.To fix the best time of composite resin restoration to tooth after beyond tooth bleaching.
Method:
1. using universal testing machine to test the uTBS of resin-enamel before beyond tooth bleaching and after bleaching in 1 week,2 weeks and 3 weeks to bond.
2. Observing the resin-enamel bond interface micromorphology of each group using SEM.
3.Using Dye penetration method to evaluate the microleakage of composite resin before beyond tooth bleaching and after bleaching in 1 week,2 weeks and 3 weeks to repair.
Results:
1.The uTBS of composite resin to enamel that was bonded immediately after beyond bleaching was significantly lower than that of unbleached
Enamel(P<0.05);specimens were immersed in artificial saliva for 1 week、2 weeks、3 weeks respectively,and then resin bonded,these three groups'uTBS returned to values close to those of nonbleached enamel(P>0.05);the groups immersed in artificial saliva for 2 weeks and 3 weeks,then bonded, the uTBS was significantly higher than the group that immersed in artificial saliva for 1 week bonded(P<0.05); immersed in artificial for 2 weeks and 3 weeks bonded,these two groups'uTBS have no statistically significant differences (P>0.05).
2.SEM:The resin-enamel interface that was bonded immediately after beyond bleaching had gap,the adhering junction was bad.After immersing in artificial saliva for 1 week,2 weeks and 3 weeks,the resin-enamel interface is more and more densified.
3. microleakage:①Occlusal Margin:The margin microleakage score(MS) of resin that was repaired immediately after beyond bleaching was significantly higher than that of unbleached group(P<0.05); specimens were immersed in artificial saliva for 1 week、2 weeks、3 weeks respectively,and then resin repaired, these three groups'MS returned to values close to the control group(P>0.05); immersed in artificial saliva for 2 weeks and 3 weeks,then repaired,the MS was significantly lower than the group that repaired immediately after bleaching(P<0.05); immersed in artificial for 2 weeks and 3 weeks bonded,these two groups'MS have no statistically significant differences(P>0.05).②ingival Margin:comparison among groups,the MS have no statistically significant differences(P>0.05).③Intraclass comparison:The MS of Gingival margin was higer than the MS of Occlusal Margin in every group,the nonbleached group have no statistically significant differences(P>0.05),and the other groups have statistically significant differences(P<0.05).
Conclusion:
1.It is not suitable bonded to enamel immediately after beyond bleaching.
2. The MS of Gingival margin is higer than the MS of Occlusal Margin before and after Beyond bleaching.
3.After 1 week of Beyond bleaching,the enamel can be bonded by composite resin,but the best time is delayed 2 weeks.
探讨Beyond冷光美白前及美白后不同时期树脂-牙釉质的微拉伸强度,粘结界面的微观形态,评价V类洞边缘微渗漏情况,确定Beyond冷光美白后进行复合树脂粘结修复的最佳时期。
方法
1.万能材料试验机测试Beyond冷光美白前、美白后即刻、美白后储存于人工唾液1周,2周,3周后进行树脂粘结的树脂-牙釉质微拉伸强度。
2.扫描电镜观察各组树脂-牙釉质界面的微观形态。
3.染料渗漏法评估Beyond冷光美白前、美白后即刻、美白后储存于人工唾液1周、2周、3周后进行树脂充填的边缘微渗漏情况。
结果
1. Beyond冷光美白后即刻修复,树脂-牙釉质微拉伸强度显著降低(P<0.05)；分别储存于人工唾液1周、2周、3周后进行树脂修复,树脂-牙釉质微拉伸强度可恢复至漂白前水平(P>0.05),其中储存于人工唾液2周、3周后树脂修复,其微拉伸强度高于储存于人工唾液1周组,有统计学差异(P<0.05)；延迟2周、3周树脂修复,两组微拉伸强度无统计学差异(P>0.05)。
2.扫描电镜观察, Beyond冷光美白后即刻修复粘结界面存在缝隙,结合较差。随着储存于人工唾液中时间的延长,树脂突越来越清晰,粘结界面越来越致密。
3.微渗漏：①牙合壁：Beyond冷光美白后即刻树脂充填,与未漂白组相比边缘微渗漏明显增加(P<0.05)；漂白后储存于人工唾液1周、2周、3周后进行树脂充填,微渗漏与未漂白组相比无统计学差异(P>0.05)；储存于人工唾液1周后进行树脂充填,微渗漏与漂白后即刻相比无统计学差异(P>0.05)；储存于人工唾液2周、3周后进行树脂充填,微渗漏与漂白后即刻相比大大降低,有统计学差异(P<0.05)；储存于人工唾液2周、3周后进行树脂充填,微渗漏值无统计学差异(P>0.05)。②龈壁：各组微渗漏无统计学差异。③组内比较,各组龈壁微渗漏值均大于牙合壁微渗漏值,除未漂白组无统计学差异外(P>0.05),其余各组均存在统计学差异(P<0.05)。
结论
1. Beyond冷光美白后即刻,不适合对牙釉质进行树脂修复。
2. Beyond冷光美白前后龈壁微渗漏均高于牙合壁微渗漏。
3. Beyond冷光美白后1周,可进行牙釉质树脂修复,但最佳修复时机是漂白后2周。
Objective:
The purpose of this study was to investigate the effect of microtensile bond strength(uTBS) of composite resin to enamel before and after beyond tooth bleaching in differnet time;to observe the resin-enamel interface micromorphology of each group using a scanning electron microscope(SEM);to evaluate gingival microleakage of class V composite restorations.To fix the best time of composite resin restoration to tooth after beyond tooth bleaching.
Method:
1. using universal testing machine to test the uTBS of resin-enamel before beyond tooth bleaching and after bleaching in 1 week,2 weeks and 3 weeks to bond.
2. Observing the resin-enamel bond interface micromorphology of each group using SEM.
3.Using Dye penetration method to evaluate the microleakage of composite resin before beyond tooth bleaching and after bleaching in 1 week,2 weeks and 3 weeks to repair.
Results:
1.The uTBS of composite resin to enamel that was bonded immediately after beyond bleaching was significantly lower than that of unbleached
Enamel(P<0.05);specimens were immersed in artificial saliva for 1 week、2 weeks、3 weeks respectively,and then resin bonded,these three groups'uTBS returned to values close to those of nonbleached enamel(P>0.05);the groups immersed in artificial saliva for 2 weeks and 3 weeks,then bonded, the uTBS was significantly higher than the group that immersed in artificial saliva for 1 week bonded(P<0.05); immersed in artificial for 2 weeks and 3 weeks bonded,these two groups'uTBS have no statistically significant differences (P>0.05).
2.SEM:The resin-enamel interface that was bonded immediately after beyond bleaching had gap,the adhering junction was bad.After immersing in artificial saliva for 1 week,2 weeks and 3 weeks,the resin-enamel interface is more and more densified.
3. microleakage:①Occlusal Margin:The margin microleakage score(MS) of resin that was repaired immediately after beyond bleaching was significantly higher than that of unbleached group(P<0.05); specimens were immersed in artificial saliva for 1 week、2 weeks、3 weeks respectively,and then resin repaired, these three groups'MS returned to values close to the control group(P>0.05); immersed in artificial saliva for 2 weeks and 3 weeks,then repaired,the MS was significantly lower than the group that repaired immediately after bleaching(P<0.05); immersed in artificial for 2 weeks and 3 weeks bonded,these two groups'MS have no statistically significant differences(P>0.05).②ingival Margin:comparison among groups,the MS have no statistically significant differences(P>0.05).③Intraclass comparison:The MS of Gingival margin was higer than the MS of Occlusal Margin in every group,the nonbleached group have no statistically significant differences(P>0.05),and the other groups have statistically significant differences(P<0.05).
Conclusion:
1.It is not suitable bonded to enamel immediately after beyond bleaching.
2. The MS of Gingival margin is higer than the MS of Occlusal Margin before and after Beyond bleaching.
3.After 1 week of Beyond bleaching,the enamel can be bonded by composite resin,but the best time is delayed 2 weeks.
引文
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