两种窝沟封闭材料微渗漏的实验研究

发布时间：2018-07-03 17:32

本文选题：窝沟封闭 + 微渗漏　；参考：《安徽医科大学》2014年硕士论文

【摘要】：目的：树脂和玻璃离子都能用于窝沟封闭，两种窝沟封闭材料均被证实具有较好的防龋效果。本实验是对离体磨牙进行窝沟封闭，通过观察浸泡不同时间下染料渗入牙体表面与封闭剂两界面的情况以及离体牙片切过程中封闭材料的脱落情况，探讨何种封闭剂与牙体表面结合的更紧密、微渗漏更细小，为临床选择使用何种封闭材料进行龋病的预防提供依据。方法：本实验选取80颗牙体完整，牙冠无龋坏、深窝沟、无磨耗、无隐裂、无釉质发育和钙化不全的离体牙作为实验对象。实验一将80颗离体牙随机分为两组，实验组40颗离体牙使用光固化树脂进行窝沟封闭，对照组40颗离体牙使用玻璃离子水门汀进行窝沟封闭。分别将两组40颗封闭后的离体牙用粘蜡封闭根尖孔，距封闭剂边缘1mm以外融蜡包裹并均匀涂布两层指甲油，晾干。再将每组40颗经融蜡处理过的离体牙随机分为4个亚组，分别放入盛有2%的亚甲蓝染料的器皿中浸泡1d、1周、1个月及3个月。以上8个小组记为实验组A组、B组、C组、D组，对照组E组、F组、G组、H组。将浸泡后的离体牙冲洗去除指甲油，然后纵向剖开离体牙获得切片样本，显微镜下观察各组封闭材料边缘亚甲蓝染色剂渗入情况。实验二取实验一浸泡后纵向剖开的8组离体牙切片样本，显微镜下观察各组封闭材料的脱落情况。结果：实验一 1.封闭材料组内比较：不同浸泡时间下4组光固化树脂的亚甲蓝渗透评估分数（P=0.020）差异有统计学意义。说明光固化树脂的亚甲蓝渗透程度随着时间的延长而增加。不同浸泡时间下4组玻璃离子水门汀的亚甲蓝渗透评估分数（P=0.015）差异有统计学意义。说明玻璃离子水门汀的亚甲蓝渗透程度随着时间的延长而增加。 2.封闭材料组间比较：浸泡1d、1周的光固化树脂和玻璃离子水门汀的亚甲蓝渗透评估分数（P=0.317，P=0.068）差异无统计学意义。浸泡1月、3月的光固化树脂和玻璃离子水门汀的亚甲蓝渗透评估分数（P=0.044，P=0.040）差异有统计学意义。实验二 1.封闭材料组内比较：不同浸泡时间下4组光固化树脂的切割脱落情况差异无统计学意义。光固化树脂随着时间的延长封闭剂未见明显脱落。不同浸泡时间下4组玻璃离子水门汀的封闭剂切割脱落情况（P=0.025）差异有统计学意义。说明玻璃离子水门汀随着浸泡时间的延长脱落率也增大。 2.封闭材料组间比较：浸泡1d、1周的光固化树脂和玻璃离子水门汀的封闭材料切割脱落情况（P=0.211，，P=0.087）差异无统计学意义。浸泡1月、3月的光固化树脂和玻璃离子水门汀的封闭材料切割脱落情况（P=0.003，P=0.000）差异有统计学意义。结论：本实验研究表明玻璃离子水门汀作为窝沟封闭材料可以发挥封闭效果，随着时间的延长，染色渗透明显、切割脱落率增加，封闭性能较光固化树脂材料差。临床上应首选树脂封闭剂。此外，光固化树脂也存在一定程度的微渗漏，提示树脂类封闭材料仍需要在提高封闭性能方面做进一步研究。
[Abstract]:Objective : Both resin and glass ions can be used for the sealing of the socket ditch , and the two kinds of socket sealing materials have been proved to have good effect of preventing caries . This experiment is to investigate the effect of the blocking agent on the interface between the surface of the tooth body and the blocking agent and the shedding of the sealing material during the cutting of the ex vivo . The paper discusses the closer the sealing agent and the surface of the tooth body combine , and the micro leakage is smaller , which provides the basis for the clinical choice of which sealing material is used for preventing dental caries .

Methods : 80 teeth were selected in this experiment without caries , deep fossa sulcus , no abrasion , no hidden fissure , no enamel development and calcification .

Experiment 1

Forty two groups were randomly divided into two groups : 40 in the experimental group were closed with light - curing resin and 40 in the control group were sealed with glass ionomer cement . Two groups were randomly divided into four subgroups : Group A , Group B , Group C , Group D , Group E , Group F , Group G , Group H .

Experiment 2

The specimens were taken from the specimens of 8 groups , which were longitudinally sectioned after immersion , and the shedding of each group was observed under the microscope .

Results :

Experiment 1

1 . The difference of methylene blue penetration fraction ( P = 0.020 ) of 4 groups of photo - cured resin under different soaking time was statistically significant . The difference of methylene blue penetration ( P = 0.015 ) in group 4 glass ionomer increased with time .

2 . There was no significant difference between the methylene blue permeation assessment scores ( P = 0.317 , P = 0.068 ) of the photo - cured resin and the glass ionomer cements at 1d and 1 week . The difference of the methylene blue permeation assessment scores ( P = 0.044 , P = 0 . 040 ) of the photo - cured resin and the glass ionomer cements were statistically significant in January and March .

Experiment 2

1 . There was no significant difference in the cut - off condition of 4 groups of photocuring resins in different soaking time . There was no significant drop in the sealing agent of the photocuring resin with time . The difference of the blocking agent of 4 groups of glass ionomer cements in different soaking time was statistically significant ( P = 0.025 ) .

2 . There was no significant difference in the cutting and dropping of the sealing materials of the photo - cured resin and the glass ionomer cement ( P = 0.211 , P = 0.087 ) in the soaking 1d and 1 week . The difference of the cutting and dropping of the sealing material of the photo - cured resin and the glass ionomer cements in the months of immersion ( P = 0.003 , P = 0.000 ) was statistically significant .

Conclusion : The experimental study shows that the glass ionomer cement can exert a close effect as the closed material of the socket . With the extension of time , the dye penetration is obvious , the cutting off rate is increased , and the sealing performance is worse than that of the photocurable resin . In addition , the resin sealant should be preferred in clinic . In addition , the photo - cured resin also has a certain degree of microleakage , and it is suggested that the resin - based sealing material still needs to be further studied in improving the sealing performance .
【学位授予单位】：安徽医科大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R781.1

【参考文献】