Application of Adhesive Low Viscosity Composites for indirect Restorations

嵌体修复在临时修复过程中对牙髓的保护存在固有缺陷。密封泄漏可能导致牙腔细菌污染，可能导致牙髓损伤。Liner Bond System是一种独特的粘结剂，可在牙本质表面形成紧密的密封膜，并使用低粘度复合材料（LVC）。它使我们能够在预备后立即覆盖预备好的表面，以最大限度地减少在取模、临时修复和最终粘固过程中因机械、热和细菌损伤而引起的进一步牙髓刺激。本研究旨在探讨粘附性LVC作为牙本质-牙髓保护剂在牙体牙髓间接修复中的作用。(1)CR嵌体骨水泥（Kuraray）与牛牙本质的粘结强度（127.5kg/cm ^2）显著高于无衬骨水泥（88.7kg/cm ^2）。LVC内衬完全消除了II类复合树脂嵌体的颈缘渗漏。(2)研究了五种临时填充材料对LVC粘接复合材料的影响。Cavit-G是一种水硬化材料，可显著提高粘结强度。丁香酚和非丁香酚材料不影响粘附。树脂基材料Duraseal粘在内衬表面上，显著损害了粘合。与5种临时填充材料接触的LVC表面均出现形态改变和表面硬度降低，提示内衬与临时填充材料之间存在相互作用。(3)评价了猴牙髓对CR嵌体放置在釉质蚀刻、全蚀刻和粘合剂LVC内衬洞的反应。LVC衬里表现出最少的牙髓反应。(4)一项临床研究表明，在LVC内衬的洞放置瓷嵌体没有术后敏感性。研究结果表明，低聚氯乙烯粘合衬是一种有效的纸浆间接漂白技术

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