Application of Adhesive Low Viscosity Composites for indirect Restorations

嵌体修复在临时修复中对牙髓的保护存在固有的缺陷。密封渗漏可能会导致细菌污染蛀牙，并可能导致牙髓受损。Liner Bond System是一种独特的用粘接树脂和低粘度复合材料（LVC）在牙本质表面产生紧密密封膜的系统。它使我们能够在准备后立即覆盖准备好的表面，以最大限度地减少在印模，临时修复和最终粘合过程中由于机械，热和细菌的损伤对牙髓的进一步刺激。本研究旨在探讨黏附LVCs作为牙本质-牙髓保护器在间接修复中的作用，包括四个部分。(1)有LVC衬里的CR嵌固水泥（Kuraray）与牛牙本质的抗拉结合强度（127.5kg/cm^2）显著大于无衬里的（88.7kg/cm^2）。LVC衬里完全消除了边缘渗漏，即使在II类复合树脂嵌体修复体的颈缘。(2)研究了5种临时填充材料对复合材料与LVC粘附性的影响。Cavit-G是一种水硬化材料，显著提高了粘结强度。丁香酚和非丁香酚材料对附着力没有影响。一种以树脂为基础的材料，Duraseal，粘在衬垫表面，严重损害了粘合。与5种临时填充物接触的LVC表面形貌发生改变，表面硬度降低，表明衬垫与临时填充物相互作用。(3)研究了猴髓对釉质蚀刻、全蚀刻和黏附LVC内衬CR嵌体的反应。LVC内膜的牙髓反应最小。(4)临床研究显示，在LVC衬里腔内放置瓷嵌体，术后无敏感性。本研究结果表明，黏附LVC衬里间接修复是一种有效的牙髓修复技术

Inlay Restoration has an inherent drawback in pulp protection during temporary restoration. Leaky sealing might result in bacterial contamination of the cavity, possibly leading to pulp damage. Liner Bond System is unique in producing tight sealing film on the dentin surface with an adhesive resin and a low viscosity composite (LVC). It enable us to cover prepared surface immediately after preparation to minimize further pulp irritation from mechanical, thermal, and bacterial insults during impression taking, temporary restoration, and final cementation. This study was designed to investigate the effect of adhesive LVCs as a dentin-pulp protector for indirect restorations, comprising four parts. (1) Tensile bond strength of CR lnlay Cement (Kuraray) to bovine dentin with LVC lining (127.5kg/cm^2) was significantly greater than that without lining (88.7kg/cm^2). LVC lining eliminated marginal leakage completely even at the cervical margin of Class II composite resin inlay restorations. (2) The effect of five temporary filling materials on the adhesion of a luting composite to the LVC was investigated. Cavit-G, a water hardening material, significantly increased bond strength. Eugenol and non-eugenol materials did not affected the adhesion. A resin based material, Duraseal, sticked on the liner surface and significantly impaired the bonding. The LVC surface in contact with five temporary filling materials showed morphological alteration and decrease of surface hardness, which suggest interacion between the liner and temporary filling materials. (3) Monkey pulpal responses to CR inlays placed enameletched, totally-etched, and adhesive LVC lined cavities were evaluated. LVC lining showed the least pulpal response. (4) A clinical study of porcelain inlays placed in LVC lined cavities revealed no post-operative sensitivity. The results of the present studies indicated that the adhesive LVC lining for indirect restorations was on effective technique for pulp