Clinical Rsearch on Mandibular Molars Severe Furcation Lesions Treatment

Objective: To investigate the clinical effect of the crown lengthening surgery,post and core to repair severe mandibular molars,with Ⅲ and Ⅳ degree of periodontal furcation.Methods: 58 patients(60 mandibular molars) with Ⅲ and Ⅳ degree of root bifurcation lesions,57 mandibular first molar,3 mandibular second molar.22 cases were residual crown associated with dental defects to subgingival addition to the line split-root plus crown lengthening surgery,postoperative residual roots,first post and core were done porcelain Lianguan repair,repair efficacy follow-up observation 6-24 months of observation.Results: 56 teeth were succeed,chewing function,no symptoms,the x-ray visible root bone mild hyperplasia after 6 months,the edge of the bony plates form.Longitudinal root fracture disconnect,two cases of porcelain crowns repair after 12 months were removed due to of repeated periodontal abscess and bone resorption,loosening,Example 10 months after chronic periapical long-term gum fistula unhealed unplug efficient 93.3%.Conclusion: Ⅲ,Ⅳ degree furcation mandibular molars by the sub-root technique and part plus crown lengthening surgery combined with porcelain-linked crown can restore the appearance of the teeth and function.