Does tooth loss in the mandibular posterior region have an effect on the mental index and panoramic mandibular index?

Abstract

Purpose: Mental index (MI) and panoramic mandibular index (PMI) are important radiomorphometric indices used for assessing the quality of the mandibular bone. The aim of this study was to investigate the possible effect of mandibular posterior tooth/teeth loss in young adults on the MI and PMI (superior panoramic mandibular index: PMI-s, and inferior panoramic mandibular index: PMI-i). Materials and methods: Digital panoramic radiographs belonging to 253 patients aged between 18-35 years old were examined. According to the inclusion criteria of the study, a patient and control group was formed. The patient group (n=46) included individuals having at least one extracted tooth in the posterior region of the mandible, and the control group (n=45) included full dentate patients. The MI and PMI (PMI-i and PMI-s) were calculated bilaterally for all of the individuals. Results: No significant difference was found between the MI, PMI-i and PMI-s indices of the patient group and the control group among both genders. Conclusion: The mandibular premolar and/or molar teeth loss in young adults did not lead to any change in the MI, PMI-i and PMI-s indices among both genders.

Evaluation of Radiomorfometric Indexes in Kennedy Class I and Class II Cases

“…11,21,22 Literatürde PMI, MCI ve MI değerlerinin dişsizlik durumuna göre farklılığını inceleyen sınırlı sayıda çalışma mevcuttur. 10,23,24 Gülşahi ve ark. çalışmalarında diş durumunun MCI'yı etkileyen en önemli parametrelerden biri olduğu sonucuna ulaşmışlardır.…”

<p>Perbedaan ketinggian tulang kortikal mandibula antara penderita bruxism dan bukan penderita bruxism berdasarkan indeks panoramik mandibular</p><p>Differences in the mandibular cortical bone height between bruxism and non-bruxism patients based on the panoramic mandibular index</p>

“…23 Tulang kortikal memiliki volume matriks yang besar dan luas permukaan yang kecil sehingga sinyal jauh yang berada di dalam matriks tidak dapat dengan mudah menemukan permukaan yang siap untuk memulai remodelling kortikal. 17 Penelitian Gulsun et al 24 yang menyatakan bahwa tidak terdapat perbedaan yang signifikan pada ketebalan tulang kortikal mandibula pada kehilangan gigi di regio posterior mandibula yang diukur berdasarkan PMI. Struktur dan fungsi otot-otot pengunyahan mengalami perubahan dengan terjadinya atrofi di daerah penyisipan otot-otot mastikasi ketika gigigigi diekstraksi dari rahang.…”

“…Struktur dan fungsi otot-otot pengunyahan mengalami perubahan dengan terjadinya atrofi di daerah penyisipan otot-otot mastikasi ketika gigigigi diekstraksi dari rahang. 24 Penelitian ini menggunakan sampel dengan kriteria rentang usia 20-50 tahun. Tabel 1 menunjukan bahwa sebagian besar sampel penderita bruxism yaitu sebanyak 90% (27 sampel) berusia 20-30 tahun.…”