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Abstract
著者らは, 4-META(4-メタクリロキシエチルトリメリット酸無水物)のような親水性基と疎水性基を有するモノマーを合成し, 象牙質とレジンとの接着性を向上させる研究をおこなってきた.そして4-META/MMA-TBB系レジンの象牙質への接着において, 酸エッチングにより象牙質コラーゲンを変性させると, 接着強さは6MPaの値しか示さないが, グルタルアルデヒドやFeCl_3を用い, タンパク質の高次構造を制御することにより, その接着強さを11〜18MPaまで向上することができると報告してきた.今回は重合触媒にTBBを用いない系の新しい4-META系ボンディング剤の試作をおこなった.その結果, A液MMA:HEMA=80:20中に2wt%4-META, 0.5wt%BPO, B液5wt%グルタルアルデヒドを含むエタノール水溶液中に2wt%p-トルエンスルフィン酸ナトリウムを添加した二液性ボンディング剤が良好な接着性を示し, 歯科領域で多用されているBPO-アミン系触媒の即硬性レジンとの接着において, 10-3溶液で30秒間前処理した象牙質に対し13MPa, 0.5M EDTA2Naで60秒間前処理した場合9MPa, 65%リン酸で30秒間エッチングした場合19MPaの高い接着強さが得られた.
We have been studying adhesive resins to dentin by using new methacrylates with hydrophobic and hydrophilic groups such as 4-methacryloxyethyl trimellitate anhydride(4-META).During studies on adhesion mechanism of a 4-META/MMA-TBB resin to dentin, it was found that the denaturation of dentinal collagen during acid etching decreased the bond strength to 6MPa, and that the preservation of the higher structure of the protain by application of glutaraldehyde or FeCl_3 in the pretreatment for the bonding was essential to obtain higher bond strength(11〜18MPa)to dentin.A new bonding agent without TBB was developed in this study.It consists of two components, one is 2wt% 4-META in a monomer mixture of 20% HEMA and 80% MMA containing 0.5wt% BPO, and the other is 2wt% p-toluenesulfinic acid sodium salt and 5% glutaraldehyde in ethanol.The tensile bond strength treated with 10-3 for 30 sec, 0.5M EDTA 2Na for 60 sec or 65% phosphoric acid for 30 sec were 13, 9 or 19MPa respectively.The treated dentin was first applied to the bonding system, and then joined to a PMMA rod with conventional BPO-amine self-curing resin.
Journal
- Journal of the Japanese Society for Dental Materials and Devices [List of Volumes]
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Journal of the Japanese Society for Dental Materials and Devices 5(2), 252-260, 1986-03-25 [Table of Contents]
The Japanese Society for Dental Materials and Devices (JSDMD)
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