ROSIDA SANI, 021318066309 (2017) DIMENSI SIMFISIS DAN POSISI INSISIF MANDIBULA PADA MALOKLUSI KLAS I DAN KLAS III SKELETAL DENGAN POLA FASIAL YANG BERBEDA (Studi Sefalometri). Thesis thesis, Universitas Airlangga.

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Abstract

Mandibular simphysis is an anatomical structure of mandible in which the lower incisor are found including the anterior portion of chin, contributes to the composition and balance of facial and must be considered when deciding on orthodontic treatment in borderline case. Alveolar bone thickness varies by location and pattern of face. The effectiveness of tooth movement is established by the boundaries of the bones that construct the alveolar bone. Out of this bound, iatrogenic condition can be appear. Objective : The aim of this study was to determined the dimension of mandibular symphisis and to evaluate the relationship between mandibular symphisis dimension with mandibular plane angle in class I and class III skeletal malocclusion wich have different vertical facial pattern. Material and Methode : Samples were 97 cephalometric orthodontic patients that have not been done for orthodontic treatment. Sample were divided into two groups wich are class I skeletal malocclusion group and class III skeletal malocclusion group. Then, each group was separated in 3 subgroups by vertical skeletal patterns that are hyperdivergen, normodivergen and hypodivergen in accordance with the sample criteria. Mandibular symphisis dimension LP (lingual cortex), LA (labial cortex), mandibular symphisis height (LH), IMPA and relationship between mandibular symphisis dimension (LP, LA, dan LH) with mandibular plane angle and then measured in each group. Result : Data were analysed by Kolmogorov Smirnov Test, oneway ANOVA, paired t-test, and Spearman correlation test with significance level (p=0.05). Oneway ANOVA analysis result showed significant differences in measurement result of mandible symphisis (LP, LA, and LH) to each sagital skeletal pattern and vertical skeletal pattern. Spearman correlation test results significance negative correlation among mandibular symphisis dimension (LP and LA) and showed an adequate significant positive correlation between mandibular symphisis dimension (LH) and mandibular plane angle in class I and class III group.

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