Association between Mandibular Incisor to Mandibular Plane Angle (IMPA) and Periodontal Health Status Based on Loss of Clinical Attachment Level (CAL): A Cross-sectional StudyLee, Yoojin (2021) Association between Mandibular Incisor to Mandibular Plane Angle (IMPA) and Periodontal Health Status Based on Loss of Clinical Attachment Level (CAL): A Cross-sectional Study. Master's Thesis, University of Pittsburgh. (Unpublished)
AbstractBACKGROUND: IMPA (mandibular incisor to mandibular plane angle) is a routinely used cephalometric measurement to determine the position of the mandibular incisors. As orthodontic treatment tends to increase the mandibular incisor inclination, there have been several studies that examine post-orthodontic IMPA and periodontal involvement limited to gingival recession via clinical examination. However, there has not been a study where the mandibular incisor inclination is evaluated regarding the loss of clinical attachment level (CAL), defined as the distance from cemento-enamel junction (CEJ) to the probe tip, which gives more objective evaluations than pocket probing depth. It is hypothesized that the patients with a greater clinical attachment loss (CAL) are likely to have a higher IMPA. OBJECTIVE: The purpose of this study is to evaluate whether the IMPA is associated with periodontal involvements, measured by the loss of CAL. MATERIAL AND METHODS: In this study, the IMPAs of two groups of adult patient populations were compared (n = 10 each): a periodontally healthy group from the orthodontics department who were periodontally cleared to proceed with orthodontic treatment and a periodontally unhealthy group from the periodontics department who were diagnosed as stage II (3-4mm CAL) and stage III periodontitis (>5mm CAL) as defined by the American Academy of Periodontology. Statistical analyses were performed to evaluate the association between CAL and IMPA and were adjusted for confounding factors such as age and sex. RESULTS: The periodontally healthy group had the average CAL on the mandibular central incisors of 0.318 ± 0.380mm facially and 0.268 ± 0.318mm lingually with the average IMPA of 94.627 ± 5.329 degrees. The periodontally unhealthy group had the average CAL on the mandibular central incisors of 3.858 ± 0.781mm facially and 3.018 ± 1.129mm lingually with the average IMPA of 96.733 ± 8.992 degrees. The difference in IMPA between the two groups was not statistically significant. There was a significant correlation between age and CAL but not between IMPA and CAL. Sex was not correlated with either CAL or IMPA. CONCLUSION: No significant association was found between CAL and IMPA. Age and sex were not confounding factors. Share
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