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Light-Embrittled Dental Resin Cements Containing Photodegradable Polyrotaxane Cross-Linkers for Attenuating Debonding Strength
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-11-25 , DOI: 10.1021/acsapm.0c01024
Satomi Matsunaga 1 , Atsushi Tamura 2 , Mayu Fushimi 2 , Hokuto Santa 2 , Yoshinori Arisaka 2 , Toru Nikaido 3 , Junji Tagami 1 , Nobuhiko Yui 2
Affiliation  

Notwithstanding the progress of dental material adhesion on tooth surfaces in the past several decades, debonding strongly adhered restorative materials from tooth surfaces remains a challenging issue. Herein, we propose the use of photodegradable polyrotaxanes (PRXs), which are supramolecular-interlocked polymers comprising α-cyclodextrin threaded along a poly(ethylene glycol) (PEG) axle, as a component of adhesive resin cements to attenuate debonding strength via light irradiation. We synthesized photodegradable PRXs (iNB-PRXs) using internally o-nitrobenzyl ester-introduced PEG as an axle polymer. Notably, approximately 60% of iNB-PRX degraded into its constituent molecules after 5 min of irradiation with ultraviolet (UV) light. Thereafter, iNB-PRX was combined with the clinically utilized adhesive resin cement, and a poly(methyl methacrylate) (PMMA) block was adhered on the surface of bovine dentin using an adhesive resin cement cross-linked with iNB-PRX. Although the PMMA block was successfully adhered onto the dentin with a clinically acceptable adhesive force, the tensile strength of the PMMA–dentin specimens decreased significantly upon UV irradiation for 2 min owing to the UV-induced degradation of the iNB-PRX cross-linker. According to these results, the adhesive resin cement containing photodegradable iNB-PRX cross-linkers is a promising candidate for facilitating the debonding of dental materials from tooth surfaces via UV light irradiation.

中文翻译:

包含光降解性聚轮烷交联剂的轻压型牙科树脂水泥,可减轻剥离强度

尽管在过去的几十年中牙科材料在牙齿表面上的粘附性取得了进步,但是从牙齿表面上剥离牢固粘附的修复材料仍然是一个具有挑战性的问题。在本文中,我们建议使用光降解聚轮烷(PRXs)作为粘合剂树脂水泥的一种组分,该超分子互锁聚合物包含沿聚(乙二醇)(PEG)轴键合的α-环糊精,通过光辐照来减弱剥离强度。我们使用合成光降解内部PRXs(INB-PRXs)Ø-硝基苄基酯引入的PEG作为车轴聚合物。值得注意的是,在用紫外线(UV)照射5分钟后,大约60%的iNB-PRX降解为其组成分子。之后,将iNB-PRX与临床上使用的粘合树脂胶粘剂组合,并使用与iNB-PRX交联的粘合树脂胶粘剂将聚甲基丙烯酸甲酯(PMMA)嵌段粘合在牛牙本质的表面上。尽管PMMA嵌段以临床上可接受的粘合力成功粘合到了牙本质上,但由于紫外线引起的iNB-PRX交联剂降解,PMMA-牙本质样品的抗张强度在紫外线照射2分钟后显着下降。根据这些结果,通过紫外线照射。
更新日期:2020-12-11
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