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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。
Objective: To investigate the effect of sandblasting on the shear bond strength of rebond ceramic brackets designed on different undersides. Methods: Ninety healthy premolar teeth extracted from orthodontics were randomly selected for preparing 30 spalled ceramic brackets. The remaining 60 samples were used for the bonding experiment. The 60 teeth were divided into 3 groups according to different bottom designs: micro-recess bottom group (A group), micro-crystal bottom group (B group) and resin bottom group (C group) Groove group (n), sandblasting group (sb), each group of 10 teeth. Ceramic brackets are glued to the slightly wetted teeth that have not been subjected to an acid etching treatment and then carefully removed using a bracket cutter to form a drop bracket. The bottom of the bracket is sand-blasted. A silane Coupling agent. Detached teeth after conventional dental treatment, respectively, new brackets and brackets after bonding, determination and comparison of the shear strength of each group. Results: The initial shear bond strength and rebond shear strength of the three groups were (12.4733 ± 3.4326) Mpa and (9.1612 ± 1.3261) Mpa respectively; (12.7374 ± 3.8999) Mpa and (6.7152 ± 3.1876) MPa; (9.5022 ± 1.8801) Mpa and (6.6281 ± 2.1187) Mpa, respectively. The shear strength of group A was greater than that of group B and C (P <0.05) There was a difference in shear strength but no statistical significance (P> 0.05). Conclusion: The anti-shear strength of the three groups of ceramic brackets re-bonding decreased significantly, but higher than the lowest required shear strength value of orthodontic clinics. Micro-crypt bottom and microcrystalline bottom and polymer bottom compared to the lowest shear strength decline, more suitable for sandblasting.