Abstract：
OBJECTIVE: To investigate the effects of erbium laser pretreatment on the bond strength of dentin and enamel,as well as microleakage at the edge of tooth defects repaired with computer-aided design (CAD) and computer-assisted manufacturing (CAM) glass-ceramic restorations for repairing dental defects.
METHODS: A total of 62 fresh, nondecayed, nondiscoloration and noncracked wisdom teeth were collected from the Oral Surgery Clinic between January 2020 and January 2023. According to different pretreatment methods, they were randomly divided into two groups, erbium laser group and phosphoric acid group, with 31 teeth in each group. Each group was further divided into two subsets for bond strength testing (16 teeth) and microleakage testing (15 teeth).The shear bond strength between enamel and dentin of both groups was compared, as well as the degree and distribution of microleakage.Statistical analysis was performed with SPSS 17.0 software package.
RESULTS: The shear bond strength between enamel and dentin of the erbium laser group was significantly higher than that of the phosphoric acid group (P＜0.05); the degree and distribution of microleakage at the lateral walls and gumline of the erbium laser group were significantly lower than those of the phosphoric acid group (P＜0.05). The scores of microleakage at the lateral walls of the erbium laser group mainly concentrated in grade 1 and 2, whereas those of the phosphoric acid group mainly concentrated in grade 2. There was significant difference in the distribution of lateral wall microleakage scores between the two groups (P＜0.05). The scores of microleakage at the gumline of the erbium laser group mainly concentrated in grade 1 and 2, whereas those of the phosphoric acid group mainly concentrated in grade 2 and 3. There was significant difference in the distribution of gumline microleakage scores between the two groups (P＜0.05).
CONCLUSIONS: Erbium laser pretreatment can improve bonding strength between glass ionomer cement and dentin and enamel, reduce microleakage at the edge of CAD/CAM glass ionomer cement restorations, and enhance marginal fit.
METHODS: A total of 62 fresh, nondecayed, nondiscoloration and noncracked wisdom teeth were collected from the Oral Surgery Clinic between January 2020 and January 2023. According to different pretreatment methods, they were randomly divided into two groups, erbium laser group and phosphoric acid group, with 31 teeth in each group. Each group was further divided into two subsets for bond strength testing (16 teeth) and microleakage testing (15 teeth).The shear bond strength between enamel and dentin of both groups was compared, as well as the degree and distribution of microleakage.Statistical analysis was performed with SPSS 17.0 software package.
RESULTS: The shear bond strength between enamel and dentin of the erbium laser group was significantly higher than that of the phosphoric acid group (P＜0.05); the degree and distribution of microleakage at the lateral walls and gumline of the erbium laser group were significantly lower than those of the phosphoric acid group (P＜0.05). The scores of microleakage at the lateral walls of the erbium laser group mainly concentrated in grade 1 and 2, whereas those of the phosphoric acid group mainly concentrated in grade 2. There was significant difference in the distribution of lateral wall microleakage scores between the two groups (P＜0.05). The scores of microleakage at the gumline of the erbium laser group mainly concentrated in grade 1 and 2, whereas those of the phosphoric acid group mainly concentrated in grade 2 and 3. There was significant difference in the distribution of gumline microleakage scores between the two groups (P＜0.05).
CONCLUSIONS: Erbium laser pretreatment can improve bonding strength between glass ionomer cement and dentin and enamel, reduce microleakage at the edge of CAD/CAM glass ionomer cement restorations, and enhance marginal fit.
摘要：
目的：研究铒激光预处理对牙本质与牙釉质结合强度的影响，以及使用计算机辅助设计（CAD）和计算机辅助制造（CAM）玻璃陶瓷修复体修复牙齿缺损的牙齿缺损边缘的微渗漏。
方法：总共62个新鲜，没有腐烂，我们在2020年1月至2023年1月期间从口腔外科诊所收集了无变色和无裂纹的智齿.根据预处理方法的不同,他们被随机分为两组，铒激光组和磷酸组,每组有31颗牙齿。每组进一步分为两个子集进行粘结强度测试（16颗牙齿）和微泄漏测试（15颗牙齿）。比较两组牙釉质和牙本质之间的剪切粘结强度。以及微渗漏的程度和分布。采用SPSS17.0软件包进行统计学分析。
结果：铒激光组牙釉质与牙本质的剪切粘结强度明显高于磷酸组（P＜0.05）；铒激光组侧壁和牙龈线微渗漏程度及分布明显低于磷酸组（P＜0.05）。铒激光组侧壁微渗漏评分主要集中在1级和2级,磷酸组侧壁微渗漏评分主要集中在2级。两组间侧壁微渗漏评分分布差异有统计学意义(P＜0.05).铒激光组牙龈线微渗漏评分主要集中在1级和2级，磷酸组主要集中在2级和3级。两组牙龈微渗漏评分分布差异有统计学意义(P＜0.05).
结论：铒激光预处理可以提高玻璃离聚物水泥与牙本质和牙釉质之间的结合强度，减少CAD/CAM玻璃离聚物水泥修复体边缘的微渗漏，并增强边际拟合。
方法：总共62个新鲜，没有腐烂，我们在2020年1月至2023年1月期间从口腔外科诊所收集了无变色和无裂纹的智齿.根据预处理方法的不同,他们被随机分为两组，铒激光组和磷酸组,每组有31颗牙齿。每组进一步分为两个子集进行粘结强度测试（16颗牙齿）和微泄漏测试（15颗牙齿）。比较两组牙釉质和牙本质之间的剪切粘结强度。以及微渗漏的程度和分布。采用SPSS17.0软件包进行统计学分析。
结果：铒激光组牙釉质与牙本质的剪切粘结强度明显高于磷酸组（P＜0.05）；铒激光组侧壁和牙龈线微渗漏程度及分布明显低于磷酸组（P＜0.05）。铒激光组侧壁微渗漏评分主要集中在1级和2级,磷酸组侧壁微渗漏评分主要集中在2级。两组间侧壁微渗漏评分分布差异有统计学意义(P＜0.05).铒激光组牙龈线微渗漏评分主要集中在1级和2级，磷酸组主要集中在2级和3级。两组牙龈微渗漏评分分布差异有统计学意义(P＜0.05).
结论：铒激光预处理可以提高玻璃离聚物水泥与牙本质和牙釉质之间的结合强度，减少CAD/CAM玻璃离聚物水泥修复体边缘的微渗漏，并增强边际拟合。
