Lopreite Gustavo, Basilaki Jorge, Romero Maria, Hecht Pedro
Department of Endodontics, School of Dentistry, University of Buenos Aires.
Department of Biophysics, School of Dentistry, University of Buenos Aires, Argentina.
Acta Odontol Latinoam. 2014;27(2):77-81. doi: 10.1590/S1852-48342014000200006.
Achieving apical foramen patency through surgical maneuvers during the biomechanical preparation of root canals is a goal sought by several schools. The aim of this study was to evaluate the deformation of the foramen as a result of using stainless steel hand files and nickeltitanium rotary instruments for achieving patency. Forty recently extracted dental roots with single canals were calibrated to a length of 18 mm and mounted on acrylic blocks to enable study maneuvers. Each foramen was observed and mapped using SEM (Phillips high vacuum) at x 100, using Golden Ratio software (Softonic). Endodontic surgical preparation was subsequently performed on all samples to 1 mm from the foramen using the Protaper rotary system up to instrument F3. The samples were then divided into two groups of twenty for apical patency maneuvers: Group A (manual patency) on which stainless steel Flexofile (MailleferSuiza) hand files gauge .10 were used, and Group B (rotary patency) on which NiTi Pathfile (DentsplyMailleferSuiza) rotary instruments gauge .13 at 150 rpm, were used. The foramina were examined again using SEM, measured, mapped and compared with the previous images. A scale was established to evaluate the observations. Results were analyzed using the Mann Whitney test, which showed no significant difference between groups (p=0.110). It is concluded that under the conditions of this study, surgical apical patency maneuvers using stainless steel manual files or nickel titanium rotary instruments produced different degrees of foramen deformation, with no significant difference between methods.
在根管生物力学预备过程中，通过手术操作实现根尖孔通畅是多个学派追求的目标。本研究的目的是评估使用不锈钢手动锉和镍钛旋转器械实现通畅后根尖孔的变形情况。将40颗近期拔除的单根管牙根校准至18毫米长度，并安装在丙烯酸块上以便进行研究操作。使用SEM（飞利浦高真空）在100倍放大倍数下，借助黄金比例软件（Softonic）对每个根尖孔进行观察和绘图。随后使用Protaper旋转系统对所有样本进行根管外科预备，直至距根尖孔1毫米处，使用到F3器械。然后将样本分为两组，每组20个，进行根尖通畅操作：A组（手动通畅）使用不锈钢Flexofile（MailleferSuiza）手动锉，规格为.10；B组（旋转通畅）使用NiTi Pathfile（DentsplyMailleferSuiza）旋转器械，规格为.13，转速为150转/分钟。再次使用SEM检查根尖孔，进行测量、绘图，并与之前的图像进行比较。建立了一个量表来评估观察结果。使用曼-惠特尼检验对结果进行分析，结果显示两组之间无显著差异（p = 0.110）。得出的结论是，在本研究条件下，使用不锈钢手动锉或镍钛旋转器械进行外科根尖通畅操作会产生不同程度的根尖孔变形，两种方法之间无显著差异。
