A Method to Bond Vital Dentin With a Microleakage-Free Hybrid Layer.

Morakot Piemjai, Thanyarat Lerttriphob, Carat Jariyapayuklert, Franklin Garcia-Godoy
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Abstract

Purpose: To investigate the dye penetration distance at Class V tooth-restoration margins/interfaces prepared in the labora-tory and orally using a primerless wet technique and MMA-TBB bonding resin with or without 4-META monomer promoter.

Materials and methods: A box-form cavity at the cementoenamel junction was prepared on extracted human premolars and vital teeth scheduled for extraction for in-vitro and in-vivo studies, respectively. For each vital cavity, 1% citric acid and 1% ferric chloride aqueous (1-1) conditioner was applied for 10 s, 30 s, or 60 s, rinsed off and blot-dried, and was then bonded with either 4-META/MMA-TBB or MMA-TBB resin and bulk-filled with light-cured composite resin (n = 10). Restored vital teeth continued to function in the oral cavity for seven days before extraction. Restorations were stored in water at 37°C and 0.5% basic fuchsin dye solution for 24 h each before dye penetration measurement under a microscope, while a hybrid layer was observed using a scanning electron microscope (SEM).

Results: No hypersensitivity or pain occurred in any vital teeth. For all 1-1 groups, no dye penetration was detected at any margins of the in- vitro restorations. Dye penetration (0.13 mm) was only observed in one intraoral restoration of 60 s etching with MMA-TBB resin at the cementum/dentin margin. A consistent hybrid layer after chemical modification was observed in leakage-free specimens.

Conclusion: The results suggest that the 1-3 µm 1-1 demineralized substrate clinically provides sufficient permeability to form a microleakage-free hybrid layer using a primerless wet technique with MMA-TBB or 4-META/MMA-TBB resin. Intraoral microleakage-free restorations may lead to longer-term restored-tooth survival.

一种用无微漏杂交层粘合牙本质的方法。
目的:研究无底物湿法和含或不含4-META单体促进剂的MMA-TBB粘接树脂在实验室和口腔制备的V类牙修复体边缘/界面上染料的渗透距离。材料与方法:分别在拔除的人前磨牙和计划拔除的活牙上制备牙釉质连接处的盒状腔,用于体外和体内研究。对于每个重要空腔,1%柠檬酸和1%氯化铁(1-1)水溶液(1-1)护发素应用10秒、30秒或60秒,冲洗干净并印迹干燥,然后与4-META/MMA-TBB或MMA-TBB树脂粘合,并用光固化复合树脂填充(n = 10)。修复后的重要牙齿在拔牙前可继续在口腔内工作7天。修复体分别在37°C的水中和0.5%的碱性品红染料溶液中保存24 h,然后在显微镜下测量染料渗透,同时在扫描电子显微镜(SEM)下观察杂化层。结果:所有生牙均未发生过敏或疼痛。对于所有1-1组,在体外修复体的任何边缘均未检测到染料渗透。用MMA-TBB树脂在牙骨质/牙釉质边缘进行60 s的口腔内修复时,仅观察到染料渗透(0.13 mm)。无渗漏试样经化学改性后形成一致的杂化层。结论:结果表明,使用MMA-TBB或4-META/MMA-TBB树脂无底漆湿法技术,1-3µm 1-1脱矿基质具有足够的渗透性,可形成无微泄漏的混合层。口腔内无微漏修复体可使修复牙长期存活。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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