[A clinical study of the relation between fusion patterns of the roots and periodontal disease in the upper molars].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar / Q000033:anatomy & histology*; D010510:Periodontal Diseases / Q000453:epidemiology / Q000503:physiopathology*; D014092:Tooth Root / Q000033:anatomy & histology*