| [background]Bifid mandibular canal is one of the mandibular canal variation clinically neglected,even now domestic anatomy teaching material has not been recorded this variation.Traces the history of the discovery of the neural tube, the first case reported in 1973 [1],after many scholars study was carried out on the bifid mandibular canal. Some scholars by tissue pathological neural tube content [2] is: myelinated nerve fibres associated with numerous venules and an artery. However, because of the limitations of research methods, the incidence of neural tube reported is not high. Since the CBCT in widespread application in the field of oral, because of its low cost, low dosage, high spatial resolution, research by scholars gradually applied to binary neural tube. Double neural tube gradually attention in clinic.[objective](1) Observation and study of mandibular neural tube use CBCT, statistics of the probability of occurrence.(2) According to Naitoh [3] type, double neural tube can be divided into four type,measure the neural tube to buccal lingual bone wall distance and away from the edge of jaws on the shortest distance, the neural tube branch contorts the characteristics.(3) The mandibular is divided into three areas, namely, molar area, retromolar area and mandinular ramus,, the incidence of statistics in different extents double neural tube, determine the scope of the safety of oral and maxillofacial surgery.[method](1) Collected from 2012 to 2014 in Shanghai sixth people’s hospital dental clinic, 280 patients with consent of the patient registration information and CBCT.(2) To adjust CBCT, observe which one like bifid mandibular canal.(3) For screening patients with double neural tube image, record the patient gender,age, and registration of pairs of neural tube in jaw left and right side branch at the starting point of their section measuring double neural tube positioned pipe diameter,length, and the angle of the neural tube, and the distance of the edge of distance on the buccal side of the lingual and jaw. All images are repeated measurement twice. Each measurement interval of more than 1 week. Upset data file order. Avoid measurement in the measurement of the previous measuring results when the memory and produce error. All the same measurement on the same computer.(4) On the basis of classification statistics of four type double groups of parameters of the neural tube, based on section, statistics of each section of each parameter, parsing clinical significance.[results]The incidence of bifid mandibular canal was 31.07%, and found five cases trifid mandibular canals. lingual partial upper branches in the jaw, line up go forward.According to the line direction is divided into four categories: retromolar canal,buccal and lingual canal, forward canal, trifid canal. Incidence of retromolar canal was 15%, the incidence of buccal lingual tube was 12%, 68% incidence of forward canal. And 5% incidence of trifid canal.[conclusion](1) In the Han population adult population of Shanghai area with a greater incidence of bifid mandibular canal. We should pay attention to in clinic.(2) By measuring the parameters of the Han nationality adult population of Shanghai area double neural tube, researchers are reporting are less than before report, the double neural tube of different people walk line features are different.(3) The highest incidence of neural tube in the mandinular ramus, second molar area,after retromolar area is low. In mandibular sagittal split bone cutting, molar area planting technique, MTM pulls out is about double the occurrence of neural tube,suggested that preoperative CBCT, avoid intraoperative complications and postoperative medical disputes caused by not informed in advance. |
PDF Full Text Request