Abedi Hasan, Shahriari Shahriar, Jalalzadeh Seyed Mohsen, Moradkhany Reza
Assistant Professor, Department of Endodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
Dent Res J (Isfahan). 2009 Fall;6(2):55-8.
The purpose of this study was to compare the weight of root canal filling material used in a new lateral condensation technique named mechanical lateral condensation (MLC) with that of conventional lateral condensation technique (LC). This new technique uses reciprocal handpiece.
In this experimental study, 40 human extracted straight canine teeth were used. After crown amputation, root canals were prepared with 18 mm in length. The teeth were randomly divided into four experimental groups; each group was consisting of 10 teeth. The teeth in groups IA and IB were filled by LC technique. The teeth in groups IIA and IIB were filled by MLC technique and using a finger spreader that placed in a reciprocating-action handpiece to laterally condense cold gutta-percha, creating space for accessory cones. All of the roots were weighted before and after obturation and the difference demonstrated the weight of gutta-percha mass. The data were analyzed by t-test.
The mean weight for MLC obturations was 10.82 ± 0.025 g compared with 7.37 ± 0.035 g for that of LC technique. The difference was statistically significant (P = 0.001).
This study showed that MLC technique requires more gutta-percha mass than LC technique.
本研究的目的是比较一种名为机械侧向加压（MLC）的新型侧向加压技术与传统侧向加压技术（LC）所使用的根管充填材料的重量。这种新技术使用往复式手机。
在本实验研究中，使用了40颗拔除的人直犬齿。截冠后，制备长度为18mm的根管。将牙齿随机分为四个实验组；每组由10颗牙齿组成。IA组和IB组的牙齿采用LC技术充填。IIA组和IIB组的牙齿采用MLC技术充填，并使用置于往复式手机中的手指撑开器侧向加压冷牙胶，为辅助牙胶尖创造空间。所有牙根在充填前后均进行称重，差值即为牙胶质量。数据采用t检验进行分析。
MLC充填的平均重量为10.82±0.025g，而LC技术为7.37±0.035g。差异具有统计学意义（P = 0.001）。
本研究表明，MLC技术比LC技术需要更多的牙胶。
