口内扫描仪辅助下预热树脂充填窝沟龋的微渗漏研究  

Effects of Preheating on Marginal Microleakage of Resin Composite Filled Pit and Fissure Caries Measured with Intraoral Scanner.

作　　者：余帆 吕长海[1] 马雪婷 伏丽林 饶南荃 刘波[1] YU Fan;LV Changhai;MA Xueting;FU Lilin;RAO Nanquan;LIU Bo(Department of Pediatric Dentistry, School and Hospital of Stomatology, Kunming Medical University, Kunming 650106, China;Yunnan Key Laboratory of Stomatology, School of Stomatology, Kunming Medical University, Kunming 650500, China.)

机构地区：[1]昆明医科大学附属口腔医院儿童口腔科,云南昆明650106 [2]昆明医科大学附属口腔医院云南省口腔医学重点实验室,云南昆明650500

出　　处：《口腔医学研究》2022年第7期659-665,共7页Journal of Oral Science Research

基　　金：云南省教育厅科学研究基金项目(编号:2021Y344);云南省科技厅-昆明医科大学应用基础研究联合专项资金项目[编号:2018FE001(-074)]。

摘　　要：目的:应用数字化口内扫描仪,比较室温及预热60℃3M Z350 XT通用树脂充填不同宽度窝洞后充填体边缘的微渗漏情况。方法:51颗离体恒磨牙截去牙根,牙冠自近远中向剖开,颊、舌/腭侧面各形成一牙片,随机分为6组(n=17),根据分组在颊、舌/腭面牙片上制备不同宽度的“L”形窝洞以模拟复杂窝沟[洞长(4.0±0.5)mm,洞深2 mm,洞宽分别为1 mm、1.6 mm、2 mm],窝洞制备前于车针上做标记,以控制洞深,制备中及制备完成后采用相应车针衡量窝洞宽度及长度,随后TRIOS数字化扫描仪测量窝洞三维,选取合格样本。分组如下:A1、A2、A3组(室温Z350 XT通用树脂分别充填1 mm、1.6 mm、2 mm宽的窝洞);B1、B2、B3组(预热60℃Z350 XT通用树脂分别充填1 mm、1.6 mm、2 mm宽的窝洞)。6组样本充填后进行冷热循环,每组随机抽取16个样本经1%亚甲基蓝溶液染色后于体视显微镜下观察两个不同位点的染料渗漏程度,其余样本用于扫描电镜观察。结果:相同洞宽的室温组与预热组之间的窝洞宽度、长度及洞深均无统计学差异(P>0.05)。充填1 mm宽度的窝洞时,预热组与室温组的微渗漏程度无统计学差异(P>0.05);充填1.6 mm宽度的窝洞时,预热组在位点1、位点2的微渗漏程度均低于室温组(P<0.05);充填2 mm宽度的窝洞时,预热组在位点1的微渗漏程度与室温组无统计学差异(P>0.05),而在位点2的微渗漏程度低于室温组(P<0.05)。SEM观察可见在充填1.6 mm及2 mm宽度的窝洞时,预热组复合树脂与牙体组织粘接界面较室温组更加紧密。结论:(1)数字化口内扫描应用于测量窝洞三维尺寸有一定优势;(2)预热技术可减小复合树脂边缘微渗漏;(3)对于2 mm及以下宽度的窝沟龋而言,预热至60℃的Z350 XT通用树脂更适合充填1.6~2 mm宽度的窝洞,尤其对走形复杂的窝洞更占优势。Objective:To explore the effect of preheating on the marginal microleakage of 3M Z350 XT universal resin in the treatment of dental caries with different widths with the assistance of intraoral scanner.Methods:Fifty-one human permanent molars were collected.The roots of teeth were cut off,and the crowns were split from mesial side to distal side,departing into buccal piece and lingual/palatal piece.One hundred and two samples were randomly divided into 6 groups(n=17).L-shaped cavities with different widths were prepared on samples to simulate natural pits and fissures[the length of cavity was(4.0±0.5)mm,the depth was 2 mm,and the widths were 1 mm,1.6 mm,and 2 mm,respectively].The mark was made on the bur before the preparation to determine the depth of the cavity,the different burs were used to roughly measure the width and length of the cavity during the preparation.After the completion,the cavities in three dimensions were measured by TRIOS digital scanner.Only qualified samples were selected.The width of cavities in group A1,A2,and A3 were filled with room temperature Z350 XT universal resin composite,and in group B1,B2 and B3 were filled with 60℃Z350 XT universal resin composite.All the samples were subjected to thermocycling.Sixteen samples randomly selected from each group were used to dye in 1%methylene blue solution for 24 h and to detect the extent of marginal microleakage quantitatively,while other samples were used for SEM observation.Results:There was no significant differences in the width,length,and depth of the cavities between the room temperature and preheating groups when the cavity was the same width(P>0.05).There was no significant difference between the preheating and non-preheating groups when filling the 1 mm-wide cavity(P>0.05).When filling the 1.6 mm-wide cavity,the degree of microleakage in the preheating group was lower than that in the non-preheating group at both site 1 and site 2(P<0.05).When filling the 2 mm-wide cavity,although there was no significant difference between the pre

关 键 词：数字化口内扫描 复合树脂 预热 窝沟龋 微渗漏 

分 类 号：R783[医药卫生—口腔医学]