| Objective: The use of cone-beam CT (CBCT) live maxillary firstmolars and maxillary first premolars upper2/3and apical1/3of the imageof the root canal and the maxillary first molar mesiobuccal root canal(MB2) the incidence and root canal video, imaging evidence for theclinical root canal treatment.Methods: The interception of selected cases of maxillary first molar,maxillary first premolars2/3and apical1/3of the cross-sectional images,the number of root canal for the maxillary first molar and maxillary firstpremolars analysis. Interception of the maxillary first molar root canalorifice cross-sectional image analysis for the tube in the second root ofmaxillary first molar root canal orifice location and detection rate.Results: The maxillary first molar mesiobuccal root canal root canalto the root of1/3of the highest incidence of85.95%, double root canal thesame position minimum,11.19%; far buccal root canal single root canal root of2/3of the highest incidence of89.05%double root canal root1/3of the minimum5.95%; single palatal root canal root2/3and root1/3ofthe incidence rate was98.1%higher.2/3and apical1/3the level ofcross-sectional male root for root canal number than that of womenincreased, with significant differences (P <0.01). Mesiobuccal, far buccalroot canal appeared to bend, part of the apparent second bend. Palatal rootcanal is more toward the straight. Different age groups of maxillary firstmolar MB-MB2,1.42to1.47±0.49to1.38; MB2-DB is4.38to4.50±0.63~1.34; MB2,-P is4.38~4.50±0.66~1.38. Different gender groupsof maxillary first molar MB-MB2, for men,1.39±0.24; female1.42±0.62; MB2-DBmale4.77±0.78; female4.01±0.47; MB2-P male4.86±0.66; female4.28±1.02. Maxillary first molar root MB2orifice in themesiobuccal root canal orifice far lingual from the MB-P, the root canal atthe port connection in the distance near. Nearly buccal root on2/3MB2detection rate of42.62%;1/3root of the detection rate of11.19%; farbuccal root of2/3of the detection rate of9.76%;1/3of the root of thedetection rate of2/3of5.95%; palate root detection rate of0.48%;1/3ofthe root of the detection rate of0.24%total detection rate of70.23%.Maxillary first molar MB2detection rate is67.14%10to19years old,20to29age group; each group in the mesiobuccal far in the buccal root ofthe2/3detection rates there are differences of nearly buccal root2/3maleMB2detection rate of54.75%,2/3detection rates between men and women with the root difference (p <0.01).Single tube maxillary premolars of the maxillary first premolar buccal,lingual diameter wide, single no obvious single root canal teeth cheek,tongue to bend. A single root canal teeth, showing a few teeth, bending(accounting for11%of the single-root teeth). Teeth forked double root orsemi-double root, is prone to root canal curvature (accounting for37%ofthe double-rooted teeth). Different age groups, the root canalcross-sectional shape distribution differences (P <0.05): The apicalcross-sectional shape to the main oval, increase with age, ovalThe proportion of decline and flat, round a larger proportion; rootmiddle of the cross-sectional shape of the oval-based, increase with age,the decline in the proportion of oval, round and flat percentage increases;root cervical cross-sectional shape to the flat Lord, increase with age, flatratio decreased, a larger proportion of the round and oval.Conclusion：1.CBCT technology can provide a more accurate number of the maxillaryfirst molar root canal be determined.2.CBCT technology can accurately scans curved root canal anatomy ofmaxillary first molar position and provide the basis for the diagnosis andtreatment. 3. CCBT is a non accurate positioning of maxillary first molarmesiobuccal root canal location.4.CBCT can be a true reflection of the root canal anatomy of maxillaryfirst molar mesial buccal side, a clear image, can provide an importantreference to the clinical work.5.CBCT technology can significantly improve the clinical detection rate ofthe maxillary first molar MB2.6.CBCT on MB2detection rate due to external factors decreased. |
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