การคุดแบบชนของฟันกรามแท้ซี่ที่สองล่างและความสัมพันธ์กับองค์ประกอบของขากรรไกรล่าง / วุฒิพงษ์ เหล่าอมต = Impaction of lower permanent second molar and its relationship to the mandibular components / Wuthipong Laoamata
The purpose of this study was to investigate the relationship between the mandibular components and the impaction of lower permanent second molar and to investigate the prevalence of the impaction of lower permanent second molar in the orthodontic patients. Samples were selected by purposive sampling from 2500 patients in the Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University. The patients with the impaction of lower permanent second molar were counted to calculate the prevalence. The prevalence of the impaction of lower permanent second molar in this study was 1.92%. The 11 mandibular components which are corpus length, effective length of mandible, ramus height, mandibular body length, mandibular arc, gonial angle, upper gonial angle, lower gonial angle, lower arch length discrepancy, posterior arch width and curve of spee were measured from the pretreatment radiographs and dental casts. The binary simple logistic regression analysis was performed to determine the relationship between each of the mandibular components and the impaction of lower permanent second molar. The mandibular components which had a significant relationship to the impaction of lower permanent second molar at 95% confidence intervals were mandibular body length, lower arch length discrepancy, posterior arch width and curve of spee.
