Evaluation and comparison of root resorption between tooth-borne and tooth-tissue borne rapid maxillary expansion appliances: A CBCT study

Abstract

Objective: To compare volumetric root resorption after rapid maxillary expansion (RME) between tooth-borne and tissue-borne appliances using CBCT. Repair in resorption cavities after 6 months of fixed retention was also compared. Materials and Methods: A sample of 33 subjects were randomly divided into two groups: Hyrax (n 5 16) and Haas (n 5 17). CBCT scans were taken 6 months before expansion, immediately after expansion, and 6 months after fixed retention. Mimics Innovation V 16.0 software was used for segmentation and volumetric measurement of 198 teeth. Bland-Altman plots, independent samples t test, repeated measures analysis of variance, and the Friedman test were used for statistical analysis. Results: Differences in root resorption after RME and repair after retention were not significant between the hyrax and Haas appliances or between male and female. Significant differences were found between preexpansion and postexpansion root volumes in the first premolars and molarseven in unattached second premolars. When the percentage of root volume loss is considered, no significant difference was found between the first premolar, second premolar, and first molar. Volumetric changes after 6 months of retention were not statistically significant.

Evaluation of miniscrew-supported rapid maxillary expansion in adolescents: A prospective randomized clinical trial

“…In a clinically successful RME application, theoretically, no significant changes should occur to the roots because the orthopedic force used during the expansion procedure is intended to separate the maxillary suture. However, findings from classic 26 and more recent research studies 11,12,27 suggested the increased possibility of root surface changes and resorption following tooth-borne RME therapy as compared with other alternatives. Since RME therapy is composed of using heavy buccally directed forces, most root resorption occurs on the buccal surface of the roots 11,26,28 in the form of small irregularly shaped lacunae.…”

Root Resorption in Orthodontics

“…Further, there are studies that have found that rapid expansion might induce root resorption in the unattached second premolar tooth (24).…”

“…CBCT is used to determine resorption cavities, but there are few studies revealing material loss in the root by volumetric calculations (24). Because CBCT is reliable in volumetric calculations of the teeth (46), it can be used to measure root resorption.…”

Efeitos adversos da expansão rápida da maxila nos tecidos dentários e de suporte de indivíduos jovens com fissura labiopalatina unilateral

“…Independente de diversos pesquisadores terem adotado o método volumétrico ou linear, existe um consenso sobre a significativa reabsorção radicular que ocorre frente à ERM (Akyalcin et al, 2015;Baysal et al, 2012;Dindaroglu;Doʇan, 2016). A RRAE média para as 3 raízes do primeiro molar permanente superior foi na ordem de 0,5 mm (Akyalcin et al, 2015).…”

“…Os estudos que avaliaram volumetricamente a mudança estrutural da raiz após ERM em pacientes sem FLP encontram uma reabsorção radicular significativa nos participantes (Baysal et al, 2012;Dindaroglu;Doʇan, 2016). O mesmo padrão de resposta foi encontrado em uma investigação conduzida com método de mensuração linear (Akyalcin et al, 2015).…”