Evaluation of condylar position by CBCT after static and dynamic registration in edentulous patients

Abstract

r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 5;5 6(1):9-17 Cone beam computed tomography Stomatognatic system a b s t r a c t Objectives: The aims of this study are to: compare the condylar position in articular fossa after static and dynamic registration; analyze symmetry between right and left condyles and examine the relationship between articular eminence and condylar position.Methods: Twenty completely edentulous patients were included in this study, after signing a written informed consent. Static registration was obtained by mandibular manipulation and dynamic registration was performed by Gothic Arch Tracing. Patients were submitted to one cone beam in static registration, followed by another with dynamic registration.Radiographic image measurements in lateral and frontal cuts were made. Results:No statistically significant differences between the two methods were found. In dynamic registration all the distances were smaller, more consistent and equidistant. Condyles stayed in a closer position to the articular fossa and in a centred position. For this registration a higher symmetry between left and right condyle exists, revealed by homogeneous results. Static registration had a higher heterogeneity of results, due to the fact that it is dependent upon a number of factors. Conclusions: Dynamic registration seems a reliable and an accurate method to use. With the higher condylar symmetry and the centred position in articular fossa, it seems that this registration reproduces a physiologic condylar position. article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).10 r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 5;5 6(1):9-17 Avaliação da Posição Condilar na TCFC após Registo Estático e Dinâmico em Desdentados Totais Bimaxilares Palavras-chave: Relação Cêntrica Côndilo Mandibular Articulação Temporomandibular Registo Intermaxilar Tomografia computorizada de feixe cónico Sistema estomatognático r e s u m o Objetivos: Os objetivos deste estudo são a comparação da posição condilar, após registo estático e dinâmico; análise da simetria entre o côndilo direito e o côndilo esquerdo e a análise da relação entre a eminência articular e a posição condilar. Métodos: Vinte desdentados totais participaram neste estudo, após assinarem um consentimento informado. O registo estático foi realizado através da manipulação mandibular e o dinâmico através do registo do traç ado do Arco Gótico. Os doentes foram submetidos à primeira tomografia com o registo estático, tendo sido realizado a segunda com o registo dinâmico. Foram realizadas mediç ões nos cortes tomográficos laterais e frontais. Resultados: Não foram encontradas diferenças estatisticamente significativas entre os dois registos. No registo dinâmico todas as distâncias foram menores, mais consistentes e equidistantes. Os côndilos estavam numa posição mais centrada e próxima da fossa articular. Com este registo verificou-se uma maior simetria entre côndilos, através de res...

Clinical reproducibility of different centric relation recording techniques in edentulous individuals: An observational cross‐sectional study

“…Some studies 16,19,36,52,53 have reported that graphic CR recording techniques represent a valid reference as a comparison parameter, because the patient must perform lateral and protrusive movements to apply them. Their reproducibility tends to be more reliable, considering that there is an orthoprosthetic (muscular) balance, which requires the patient to master the movements of the mandibular jaw 33,58,59 .…”

“…Their reproducibility tends to be more reliable, considering that there is an orthoprosthetic (muscular) balance, which requires the patient to master the movements of the mandibular jaw 33,58,59 . As in a study by Veloso et al, 19 the EOGA technique was selected as a control compared to other techniques because the externally placed steel plates eased the visualization of the graphic trace 54 . When placed intraorally, it is impossible for the professional to visually follow the trace during the mandibular movements performed by the patient 19 …”

“…As in a study by Veloso et al, 19 the EOGA technique was selected as a control compared to other techniques because the externally placed steel plates eased the visualization of the graphic trace 54 . When placed intraorally, it is impossible for the professional to visually follow the trace during the mandibular movements performed by the patient 19 …”

“…The same facebow was used for all patients for maxillary casts assembled on the articulator, according to Zarb et al 49 All techniques, except EOGA, were performed randomly by the operator according to the preestablished randomization done at the beginning of the study. The EOGA technique was chosen as the baseline (control) point of comparison to the other techniques 16,19,36,[52][53][54] and was the first to be recorded and assembled in a semi-adjustable articulator. Before assembling the cast using this technique, the condylar guidance was fixed at 30 • and Bennett angle at 15 • on both sides.…”

“…6 From a clinical and scientific point of view, the need for a technique that offers accuracy and reproducibility to determine and record the position of the condyle is vital. Several techniques have been described in the literature to establish CR in edentulous patients, [7][8][9][10][11][12][13][14][15][16][17][18][19] in which the physiological or guided graphic methods are the most common.…”