3种金属底板托槽喷砂处理前后粘结强度的比较及其意义  

Comparison of bond strengths of three kinds of metal bottom plate brackets before and after sandblasting and its significance

作　　者：王守东[1] 杨陆一 宁磊[1] 牡琦丽 闫婧 赵雪娇 于淼 孙淑芬[2] WANG Shoudong;YANG Luyi;NING Lei;MU Qili;YAN Jing;ZHAO Xuejiao;YU Miao;SUN Shufen(Department of Orthodontics,Stomatology Hospital,Jilin University,Key Laboratory of Tooth Development and Bone Remodeling and Regeneration,Jilin Province,Changchun 130021,China;Department of Endodontics and Operative Dentistry,Stomatology Hospital,Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学口腔医院正畸科吉林省牙发育及颌骨重塑与再生重点实验室,吉林长春130021 [2]吉林大学口腔医院牙体牙髓病科,吉林长春130021

出　　处：《吉林大学学报（医学版）》2018年第5期949-954,共6页Journal of Jilin University：Medicine Edition

基　　金：吉林省科技厅科研基金资助课题(20150312021ZG)

摘　　要：目的:探讨在人工唾液条件下临床正畸常用的3种金属底板托槽及脱落后经喷砂处理3种托槽的粘结强度,评价其粘结性能。方法:收集60颗因正畸需要拔除的上颌前磨牙,随机分为国产直丝弓新亚托槽(新亚)组、进口直丝弓MBT超薄托槽(MBT)组和日本直丝弓TOMY自锁托槽(TOMY)组,每组20颗。托槽脱落后将牙齿随机分为6组,分别粘结新的和脱落后经喷砂处理的3种托槽,每组10个。采用万能电子力学实验机测定每组的抗剪切强度,放大镜观察每组牙釉质表面粘结剂残留指数(ARI),扫描电镜观察不同底板托槽及脱落后经喷砂处理后的托槽底板形貌。结果:在人工唾液条件下,TOMY组初次粘结新托槽和再次粘结新托槽的抗剪切强度高于新亚组和MBT组(P<0.05),而新亚组的抗剪切强度与MBT组比较差异无统计学意义(P>0.05);再次粘结脱落后经喷砂处理的3组托槽中,TOMY组抗剪切强度大于新亚组和MBT组(P<0.05),而新亚组的抗剪切强度与MBT组比较差异无统计学意义(P>0.05);TOMY组和MBT组脱落后经喷砂处理的托槽抗剪切强度较原托槽均增大(P<0.05)。各组的ARI比较差异无统计学意义(P>0.05)。扫描电镜观察,3种托槽底板均为纵横相间的网格,TOMY组更为致密,喷砂后砂粒嵌入网格中,TOMY组和MBT组砂粒更多嵌入倒凹处;再次喷砂后,砂粒嵌入范围增加,并且新亚组网底的网格结构出现破坏,其他2组未见明显异常。结论:3种底板托槽的粘结强度均能满足临床需要,其中TOMY组托槽的粘结强度优于其他2组。喷砂法处理脱落的TOMY和MBT托槽后可以提高托槽的粘结强度。Objective:To discuss the bond strengths of three kinds of metal bottom plate brackets commonly used in clinic and after sandblasting treatment under the condition of artificial saliva,and to evaluate their bonding properties.Methods:A total of 60 premolar teeth extracted because of orthodontic treatment were collected and divided into domestic Xinya bracket group(Xinya group),imported ultra thin MBT bracket group(MBT group),and Japan TOMY lock bracket group(TOMY group)(n=20).The teeth were randomly divided into six groups after the three types of brackets fall off.The three types of new and sandblasting brackets were respectively bonded to the teeth randomly with 10 brackets in each group.The shear strength was detected by universal electronic mechanical testing machine,and the adhesive remnant index(ARI)of enamel surface in each group was obsereved,and the morphological features of three different base brackets and three shedding of brackets conducted by sandblasting were obsereved by scanning electron microscope.Results:Under the condition of artificial saliva,for the first bonding and bonding again,the shear strengths of the new brackets in TOMY goup were higher than those in Xinya group and MBT group(P<0.05),while the shear strengths had no statistical differences between Xinya group and MBT group(P>0.05).For the brackets treated with sandblasting after shedding in three groups,the shear strength in TOMY group was greater than those in Xinya group and MBT group(P<0.05),while the shear strengths in Xinya group and MBT group had no statistical difference(P>0.05).The shear strengths of brackets that were conducted by sandblasting after falling off in TOMY group and MBT group were increased compared with the original brackets(P<0.05).There were no statistical differences in ARI between various groups(P>0.05).The scanning electron microscope results showed that three kinds of brackets were crisscroped with the mesh,and they were more dense in TOMY group.After sandblasting,the sand grains were embedded in the g

关 键 词：底板托槽 喷砂 粘结强度 抗剪切强度 残留指数 扫描电子显微镜 

分 类 号：R783.5[医药卫生—口腔医学]