CAJ | 학술논문

目的研究选区激光融化技术制作的钛合金个性化舌侧托槽的粘接强度,以确定其能否满足临床应用的要求.方法选择80颗离体前磨牙,按照随机数字表随机分成个性化舌侧托槽组(选区激光熔化制作)和普通托槽组(3M不锈钢托槽)(每组40颗),每组细分为剪切实验亚组和拉伸实验亚组(每亚组20颗).采用35％的磷酸酸蚀后用粘接剂(3M Unitek)粘接托槽,并于室温下保存24 h,采用电子万能实验机进行剪切和拉伸实验,记录牙面粘接剂残留指数(adhesive remnant indexes,ARI)计分值和托槽脱落时的最大载荷,并计算得到剪切强度和拉伸强度.结果个性化舌侧托槽组剪切强度[6.80(6.20,8.32) MPa]显著小于普通托槽组[10.46(9.72,11.48) MPa](Z=-3.463,P＜0.05)；拉伸强度[(6.93±1.21) MPa]显著大于普通托槽组[(5.88±1.23) MPa](t=2.81,P＜0.05).结论本项研究制作的个性化舌侧托槽的剪切强度小于普通不锈钢托槽,拉伸强度大于普通不锈钢托槽,但均能满足临床应用要求.
목적 연구선구격광융화기술제작적태합금개성화설측탁조적점접강도,이학정기능부만족림상응용적요구.방법 선택80과리체전마아,안조수궤수자표수궤분성개성화설측탁조조(선구격광용화제작)화보통탁조조(3M불수강탁조)(매조40과),매조세분위전절실험아조화랍신실험아조(매아조20과).채용35％적린산산식후용점접제(3M Unitek)점접탁조,병우실온하보존24 h,채용전자만능실험궤진행전절화랍신실험,기록아면점접제잔류지수(adhesive remnant indexes,ARI)계분치화탁조탈락시적최대재하,병계산득도전절강도화랍신강도.결과 개성화설측탁조조전절강도[6.80(6.20,8.32) MPa]현저소우보통탁조조[10.46(9.72,11.48) MPa](Z=-3.463,P＜0.05)；랍신강도[(6.93±1.21) MPa]현저대우보통탁조조[(5.88±1.23) MPa](t=2.81,P＜0.05).결론 본항연구제작적개성화설측탁조적전절강도소우보통불수강탁조,랍신강도대우보통불수강탁조,단균능만족림상응용요구.
Objective To investigate the bond strengths of customized titanium bracket manufactured by selective laser melting.Methods Eighty human premolars which had been extracted for orthodontic purpose were collected and divided randomly (by random table) into two groups (customized bracket group and 3M bracket group,40 molars in each group).The 35％ phosphoric acid was used for etching and the brackets were bonded with 3M Unitek bonding adhesive.All bonded specimens were placed in saline for 24 hours at room temperature and were tested on DWD3050 electronic testing machine to determine the shear bond strength and tensile bond strength.After debonding,the adhesive remnant indexes (ARI) were recorded.Results The shear bond strengths of customized brackets was 6.80 (6.20,8.32) MPa,which was significantly lower than that of the 3M brackets [10.46 (9.72,11.48) MPa] (Z =-3.463,P ＜ 0.05).And the tensile bond strengths of customized brackets was (6.93 ± 1.21) MPa,which was significantly higher than that of the 3M brackets [(5.88 ± 1.23) MPa] (t =2.81,P ＜ 0.05).No significant difference was found in the ARI between two different kinds of the brackets.Conclusions The shear bond strength and tensile bond strength of both kinds of brackets were enough for clinic application.