The Effects To The Periodontitis By The Variation Of Mandibular First Molar Distal-Lingual Root

Objective:The purpose of this study was to evaluate whether the presence of the radix entomolaris (RE) contributes to localized periodontal destruction by comparing the shapes of RE and normal distal root.Methods:Collect 26 advanced periodonal diseases who have distal-lingual root on their mandibular first molar as case group and 34 who don't have as contral group to finish the research. The probing depth (PD), attachment loss(AL) and the furcation involvement of these teeth in both groups were scored on the mandibular first molar of two groups to be compared.Results:1.The probing depth and attachment of the disto-lingual point are significant difference between the average of the disto-lingual, mid-lingual, mesio-lingual, mesio-buccal, mid-buccal and disto-buccal points in the case group (p<0.01).2.The probing depth and attachment of the disto-lingual point are not significant difference between the average of the disto-lingual, mid-lingual, mesio-lingual, mesio-buccal, mid-buccal and disto-buccal points points in the contral group (p>0.05). 3.The degrees of furcation involvment of the case group are significant difference between contral group (p<0.01).Conclusion:Disto-lingual root of the mandibular first molar develop it's periodontal disease.