CAJ | 학술논문

目的：探讨喷砂处理对不同底面设计的陶瓷托槽再粘接抗剪切强度的影响。方法：选取90颗因正畸拔除的健康前磨牙，随机抽取30颗用于制备脱落陶瓷托槽，其余60颗用于粘接实验。将60颗牙根据不同底面设计分成3大组：微隐窝底面组（A组）、微晶体底面组（B组）、树脂底面组（C组），每大组分成2小组：新托槽组（n）、喷砂组（sb），每组10颗牙。陶瓷托槽粘接于未经酸蚀处理的微湿的离体牙上，然后用去托槽钳小心取下，形成脱落托槽，对托槽底面进行喷砂处理，并在底面常规涂硅烷偶联剂。离体牙经常规牙面处理后，分别粘接新托槽及处理后的托槽，测定并比较各组抗剪切强度。结果：三组托槽初次粘接及再次粘接抗剪切强度分别为（12．4733±3．4326）Mpa和（9．1612±1．3261） Mpa；（12．7374±3．8999）Mpa和（6．7152±3．1876）Mpa；（9．5022±1．8801）Mpa和（6．6281±2．1187）Mpa，其中A组的抗剪切强度大于B组和C组的抗剪切强度，差别有统计学意义（P＜0．05）；B组和C组两者的抗剪切强度有差别，但无统计学意义（P＞0．05）。结论：三组陶瓷托槽再粘接抗剪切强度明显下降，但高于正畸临床所需的最低抗剪切强度值。其中微隐窝底面与微晶底面和聚合体网底相比，抗剪切强度下降最少，更适合喷砂处理。
목적：탐토분사처리대불동저면설계적도자탁조재점접항전절강도적영향。방법：선취90과인정기발제적건강전마아，수궤추취30과용우제비탈락도자탁조，기여60과용우점접실험。장60과아근거불동저면설계분성3대조：미은와저면조（A조）、미정체저면조（B조）、수지저면조（C조），매대조분성2소조：신탁조조（n）、분사조（sb），매조10과아。도자탁조점접우미경산식처리적미습적리체아상，연후용거탁조겸소심취하，형성탈락탁조，대탁조저면진행분사처리，병재저면상규도규완우련제。리체아경상규아면처리후，분별점접신탁조급처리후적탁조，측정병비교각조항전절강도。결과：삼조탁조초차점접급재차점접항전절강도분별위（12．4733±3．4326）Mpa화（9．1612±1．3261） Mpa；（12．7374±3．8999）Mpa화（6．7152±3．1876）Mpa；（9．5022±1．8801）Mpa화（6．6281±2．1187）Mpa，기중A조적항전절강도대우B조화C조적항전절강도，차별유통계학의의（P＜0．05）；B조화C조량자적항전절강도유차별，단무통계학의의（P＞0．05）。결론：삼조도자탁조재점접항전절강도명현하강，단고우정기림상소수적최저항전절강도치。기중미은와저면여미정저면화취합체망저상비，항전절강도하강최소，경괄합분사처리。
Objective:The purposes of this study was to evalute the effects of sandblasting on shear bond strength (SBS)of rebonded ceramic brackets with different base designs. Method:90 human premolars extracted for orthodontic purpose were collected and divided randomly into two parts:one part (60 teeth)for the bond strength test;the other part(30 teeth) for getting debonded ceramic bracksts. For experimental part:60 human premolars were divided randomly into three groups according to different base designs:(A) round pits base,(B) microcrystalline lock base,(C)polymer mesh base. Then each test group was divided into two groups:new brackets as controls(N), sandblasting(SB).30 teeth were selected respectively from three different base designs of ceramic brackets and were bonded to unetched and slightly wet tooth sur-faces,then separated from the tooth surface easily with a tweezer with light pressure.Then different base designs of debonded brackets were sandblasted,then a silane coupling agent was applied to of bases.The teeth in each group were treated by con-ventional treatment,then were bonded with new brackets and sandblasted brackets. Shear force test was performed and then the shear bond strength was measured. Result:The SBS of 3 group which was bonded and rebounded were (12.4733 ± 3.4326)Mpa and (9.1612 ±1.3261)Mpa;(12.7374 ±3.8999)Mpa and (6.7152 ±3.1876)Mpa;(9.5022 ±1.8801)Mpa and (6.6281 ±2.1187)Mpa.The SBS of round pits base were significantly higher than microcrystalline lock base and polymer mesh base(P<0.05). There were no statistically significant difference between microcrystalline lock base and polymer mesh base (P >0.05). Conclution:After sandblasting,the shear bond strength of rebonded ceramic brackets with different base designs decreased,but was higer than the minimum bond strength required.In three cersmic brackets with different base de-signs,round pits base and microcrystalline lock base were more suitable for sandblasting treatment.