Quantitation of transverse maxillary dimensions using computed tomography: a methodological and reproducibility study

Abstract

The present investigation was a methodological study of a new method of quantification of a series of factors in the transverse dimension of the maxilla including the nose, maxillary bones and dental arches, based on computer tomographic (CT) scanning. The aim was to investigate a series of parameters thought to be relevant in the differential diagnosis of discrepancies in the morphology of this area and probably affected by orthodontic appliances. Based on a standardized CT scanning registration of 10 subjects, a series of points on the scans were identified and then measured in a special cephalometric computer system (linear and angular values). The quantitation was repeated by each observer and inter- and intra-observer differences were calculated. The results demonstrated that virtually all the parameters showed a high degree of reproducibility at both levels and confirmed the statistical suitability of the method described. The method will be used in a series of ongoing studies regarding the morphology and treatment of discrepancies of the midface and therefore supplement the relatively sparse information based on quantitative reports concerning this important anatomical area.

Treatment and posttreatment skeletal effects of rapid maxillary expansion studied with low-dose computed tomography in growing subjects

“…4 Since 1982, when CT was used for the first time to evaluate the effects of RME, 5 several studies have described the skeletal and dentoalveolar changes induced by RME in growing and adult patients based on standardized CT scanning registrations. [6][7][8][9][10][11] These studies, however, did not look at posttreatment changes, or had small samples of subjects, and used regular doses of x-ray exposure during the CT examinations.…”

Correlation Between Transverse Maxillary Discrepancy And The Inclination Of First Permanent Molars. A Pilot Study

“…10 This study aimed at evaluating the transversal maxillomandibular discrepancy and correlating it with the bucco-lingual inclination of first maxillary and mandibular molars through bimaxillary cone beam computed tomography.…”

“…Por su parte, Podesser et al, 10 en 2004, estudiaron un nuevo método para cuantificar una serie de estructuras anatómicas que pudieran tener relación con la dimensión transversal; entre ellas seleccionaron la nariz, el hueso de los maxilares y los arcos dentales. Para eso utilizaron una tomografía computarizada (Tomoscan 7000R, Philips, Eindhoven, The Netherlands), con el fin de evaluar las discrepancias y las posibles afecciones que se evidenciaban con la aparatología ortodóntica en 10 pacientes entre 26 y 31 años de edad.…”

Avaliação da inclinação dentária no tratamento compensatório do padrão II com tomografia computadorizada

“…21,26,27 Computed tomography (CT) allows the reconstruction and visualization of anatomical areas in three dimensions, revealing information about size, shape and texture and has become an important tool for all areas of dentistry, providing reliable linear 15,18,20,23 and angular 22,23 measurements. A method for evaluating torques and angulations by means of computed tomography has been described, 10 which faithfully depicts dental structures and allows professionals to measure each individual tooth, in addition to facilitating the study of dental positioning 15 and inclinations, instrumental in the diagnosis, prognosis and analysis of finished orthodontic cases.…”