Correlation between tooth size-arch length discrepancy and interradicular distances measured on CBCT and panoramic radiograph: an evaluation for miniscrew insertion

Abstract

Introduction: The selection of appropriate sites for miniscrew insertion is critical for clinical success. Objectives: The aim of the present study was to evaluate how interradicular spaces measured on panoramic radiograph compare with Cone-Beam Computed Tomography (CBCT), and how crowding can influence the presence of available space for miniscrew insertion, in order to define a new “safe zones” map. Methods: A total of 80 pre-treatment panoramic radiographs and 80 CBCT scans with corresponding digital models were selected from the archives of the department of Dentistry, Aarhus University. Crowding was measured on digital models, while interradicular spaces mesial to the second molars were measured on panoramic radiographs and CBCTs. For panoramic radiographs, a magnification factor was calculated using tooth widths measured on digital models. Statistical analyses were performed to investigate the correlation between the amount of crowding and the available interradicular space. Visual maps showing the amount of interradicular spaces measured were drawn. Results: The most convenient interradicular spaces are those between the second molar and the first premolar in the mandible, and between the central incisors in the maxilla. However, some spaces were revealed to be influenced by crowding. Conclusions: Calibration of panoramic radiographs is of utmost importance. Generally, panoramic radiographs underestimate the available space. Preliminary assessment of miniscrew insertion feasibility and the related selection of required radiographs can be facilitated using the new “safe zone” maps presented in this article.

Safe zones of the maxillary alveolar bone in Down syndrome for orthodontic miniscrew placement assessed with cone-beam computed tomography

“…When determining the best location for placing miniscrews, panoramic radiographs can underestimate the available interdental bone space 30 . The accuracy of periapical radiographs is greater than that of panoramic radiographs when assessing the length of the tooth roots 31 and when determining the position of mini-implants 32 .…”

Optimal implantation site of orthodontic micro-screws in the mandibular anterior region based on CBCT

“…Studies have shown that the stability of the micro-screw can be influenced by the choice of the implantation site, the bone condition at the implant site and the distance from the adjacent teeth. The application of CBCT will increase the accuracy of implantations and reduce the failure rate [16,17] .…”

Uma nova alternativa de Ancoragem Esquelética Ortodôntica com Mini-Implantes: Revisão de Literatura / A new alternative of Orthodontic Skeleton Anchorage with Mini-Implants: Literature Review

“…Uma das possibilidades existentes, se trata da utilização dos implantes dentários ósseo-integrados, os quais são capazes de oferecer uma ancoragem confiável e a movimentação dentária, contudo, devido ao seu tamanho, suas utilizações se tornaram limitadas (ROBERTS et al, 1996). Como o próprio nome diz, esses acessórios foram projetados para serem inseridos no osso alveolar, de forma temporária (TEPEDINO et al, 2018). Sua utilização mais usual se dá quando o paciente não é muito colaborativo, possui o número de dentes que não permite a ancoragem apropriada ou quando estes estão periodontalmente comprometidos.…”