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Main Instructor 鄭信忠
Department / Institution Orthodontic Division of Dental department, Taipei Medical University Hospital
Classification Research report
From the literature review of congenitally missing mandibular incisors cases, the treatment modalities are troublesome and complicated. The aim of this study is to analyze the treatment results of the cases with congenitally missing mandibular incisors, which would give orthodontists more hints to deal with such cases.
Material and Methods
This retrospective cohort study was designed with total 128 cases selected from TMUH. We categorized the initial malocclusion into three types: class I malocclusion, class II malocclusion, and class III malocclusion. We also divide these cases into 4 groups according to the treatment modalities. Group 1: extraction of two upper premolars, group 2: closure of lower congenital missing area, group 3: create space for prosthesis, and group 4: other treatment. We design a modified dental aesthetic index(mDAI) for analyzing the treatment results of all patients and to find the best treatment modalities. We will use the multiple regression analysis to find the affecting factor on treatment modalities of congenitally missing mandibular incisors cases.
The treatment results of all these four groups present similar good outcomes, with mDAI smaller than 36, indicating an acceptable result. Group 1, accounting for 42% total cases, shows good results with average mDAI of 30. Group 2, accounting for 36% total cases, shows good results with average DAI of 32. Group 3, accounting for 22% total cases, shows DAI of 35. We also trace back to the initial malocclusion in order to know which kind of treatment modality is proper for them. The flowchart of the treatment modality would be designed in making treatment plans. The final results will show in the e-poster.
The retrospective study suggests that most of the cases could achieve acceptable results with proper treatment plan. Further prospective study should be done in order to make the flowchart of treatment modality more comprehensive and with stronger evidence.
The Study of Treatment Modalities in Cases of Congenitally Missing Mandibular Incisors