空气喷砂技术制洞对树脂粘结界面微渗漏的研究(1)
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[摘要]目的:观察空气喷砂技术制洞对树脂粘结界面微渗漏的影响。方法:分别运用空气喷砂和传统涡轮机制洞、两种粘结体系进行牙本质粘结,采用染料渗入法观察粘结界面的微渗漏情况。结果:自酸蚀组微渗漏程度低于全酸蚀组,空气喷砂制洞组微渗漏程度低于涡轮机制洞组,酸蚀组微渗漏程度均低于未酸蚀组。结论:空气喷砂技术制洞树脂粘结界面微渗漏情况优于传统涡轮机制洞。
[关键词]空气喷砂制洞;树脂;粘结;微渗漏
[中图分类号]R783 [文献标识码]A [文章编号]1008-6455(2010)09-1366-02
Study on the dentin bonding surface micro-leakage after air-abrasion preparation
ZHANG Jin1,LI Yan-jun2,KANG Zhen3,MA Jun4
(1.College of Stomatology,The Fourth Military Medical University,Xi'an 710032 Shaanxi,China;2.Dental Clinic of the 451st Hospital of PLA;3.Dental Clinic of Beijing Armed Police Authorities;4.Dental Clinics of General Logistics Department,Beijing cadres Authority)
Abstract:ObjectiveTo study the effects of air-abrasion preparation on the dentin bonding surface micro-leakage. MethodsDentin bonding surface were prepared by air-abrasion and traditional method,the cavities were filled with two bonding systems, the micro-leakage of the bonding surface were observed by dye infiltration.ResultsThe micro-leakage of the self-etching group is better than total-etching groups, air-abrasion groups are better than traditional method group, and etching groups are better than non-etching group. ConclusionAir-abrasion preparation is better than the traditional method on the dentin bonding surface micro-leakage.
Key words:air-abrasion;composite resin;dentin bond;micro-leakage
微渗漏是由于口腔中的细菌、液体及其它有害物质沿充填体边缘向牙体内部渗漏,而导致的继发龋、充填体边缘变色、充填体脱落、牙髓症状等不良效果。微渗漏的产生与洞形的预备,材料的选择以及充填术中每一步操作等因素有关。本研究采用染料渗入法,对树脂粘结界面的微渗漏进行研究,旨在比较不同制洞方式、不同树脂粘结体系微渗漏的差别。
1材料和方法
1.1仪器和材料:KCP-1000型空气喷砂机(美国);高速涡轮机牙用治疗台(上海);GD-II型可见光固化机(广东);SE BOND粘结体系(可乐丽,日本);Esthet.XTM粘结体系(登士柏,美国)。
1.2 方法:收集因牙周病而拔除的48颗新鲜离体人恒磨牙,要求形态完整,无明显磨耗,无龋坏及裂纹。去除牙齿周围的软组织,洗净后储存于生理盐水中以防牙齿脱水。随机分为A组:空气喷砂+全酸蚀+Esthet.XTM;B组:空气喷砂+自酸蚀+SE BOND;C组:空气喷砂+未酸蚀+Esthet.XTM;D组:涡轮机制洞+全酸蚀+Esthet.XTM,每组12颗牙。在磨牙的近中或远中面分别用空气喷砂技术和涡轮机制洞按要求制备II类洞,洞形要求合面洞深度(洞缘至髓壁)3mm。鸠尾狭宽度2.5mm;邻面洞高度(牙合面洞缘至龈壁)4mm,龈壁长4mm,宽1.5mm,龈壁位于釉牙骨质界下方1mm处,窝洞用75%酒精消毒,气枪吹干。
4组标本按产品说明充填完毕,储存24h后,按50℃、37℃、55℃温度低度顺次进行温度循环,每次10s,共循环100次。37℃恒温浴槽1周,取出标本吹干后,将牙根及根部用腊封闭,在充填物边缘1mm以外用指甲油(深圳天马公司)做3层封闭。然后将冠部浸入1%亚甲基蓝溶液中。4h后,取出后去除多余染料,冲洗干净,晾干。检查充填体无松动,在充填物中央处沿牙长轴,近远中方向用金刚砂片纵切,双目手术显微镜(杭州光学仪器厂)下观察染料沿剖面渗透程度。游标卡尺(哈尔滨仪器刃具厂,精确度0.02)测量染料渗透度,并对牙合璧和龈壁的染料渗透程度进行分级记录。染料渗入等级记录为0～3级,0级:没有染料渗入;1级:有少量染料渗入牙釉质达到牙本质;2级:染料渗入牙本质但未达洞底;3级:染料渗入侧壁达洞底 ......
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