Gilhooly R M, Hayes S J, Bryant S T, Dummer P M
Dental School, University of Wales College of Medicine, Cardiff, UK.
Int Endod J. 2000 Sep;33(5):415-20. doi: 10.1046/j.1365-2591.2000.00322.x.
The aim of this project was to evaluate and compare the radiographic quality and sealability of root fillings in extracted human teeth using lateral condensation of gutta-percha or multiphase gutta-percha obturation (Alphaseal).
A total of 108 freshly extracted human, mature single-rooted teeth were divided into two identical groups of 54 teeth on the basis of root canal shape. The canals were prepared to a minimum 0.055 taper and enlarged to size 35 at the apex. All root canals were flushed with 17% EDTA solution and 2.5% NaOCl to remove the dentinal smear layer. The canals of one group were obturated using cold lateral condensation of gutta-percha and the canals of the other group were filled using a warm multiphase gutta-percha obturation technique. The extrusion of sealer and/or gutta-percha through the apex of the teeth was recorded using a simple yes/no scheme. The sealability of each technique was assessed by a dye penetration method. The radiographic quality of obturation was determined for each canal using a four-point scale.
Root canals filled by multiphase obturation had significantly more extrusion of sealer (P < 0.001) and gutta-percha (P < 0.001) than canals filled by lateral condensation. Canals filled by multiphase gutta-percha obturation had significantly less apical dye leakage than those obturated by lateral condensation (P < 0.05). Lateral condensation achieved significantly better scores for radiographic quality than multiphase obturation from the bucco-lingual view (P < 0.01).
Under laboratory conditions multiphase gutta-percha had better sealability but poorer radiographic quality than lateral condensation.
本项目旨在评估和比较采用牙胶侧向加压充填法或多相牙胶充填法（Alphaseal）对拔除的人牙进行根管充填后的影像学质量和封闭性。
根据根管形态，将108颗新鲜拔除的人成熟单根牙分为两组，每组54颗牙。根管预备至最小0.055锥度，根尖扩大至35号。所有根管均用17%乙二胺四乙酸（EDTA）溶液和2.5%次氯酸钠冲洗以去除牙本质玷污层。一组根管采用牙胶冷侧向加压充填法进行充填，另一组根管采用热多相牙胶充填技术进行充填。使用简单的“是/否”方案记录封闭剂和/或牙胶通过根尖的挤出情况。每种技术的封闭性通过染料渗透法进行评估。使用四点量表确定每个根管充填的影像学质量。
与侧向加压充填的根管相比，多相充填的根管封闭剂挤出（P<0.001）和牙胶挤出（P<0.001）明显更多。多相牙胶充填的根管根尖染料渗漏明显少于侧向加压充填的根管（P<0.05）。从颊舌向观察，侧向加压充填在影像学质量上的得分明显高于多相充填（P<0.01）。
在实验室条件下，多相牙胶的封闭性优于侧向加压充填，但影像学质量较差。
