Overjet as a predictor of sagittal skeletal relationships

Abstract

Skeletal relationships in the sagittal plane do not always correspond with dental relationships. The aim of this study was to determine in which type of malocclusion the correlation between overjet and skeletal sagittal parameters assessed by lateral cephalogram analysis is the highest. The extent to which overjet can predict skeletal relationships in the sagittal plane was also assessed. Eighty-three subjects fulfilled the inclusion criteria (40 males and 43 females, mean age 16.3 +/- 4.3 years). Overjet was measured on study casts and sagittal skeletal relationships were analysed on lateral cephalograms. ANB angle, Wits appraisal, and convexity at point A were determined. Mean values and standard deviations of measured parameters were calculated for Class I, Class II division 1, and Class III malocclusion subjects. Correlation between overjet measured on study casts and sagittal skeletal parameters measured on lateral cephalogram was calculated. Overjet as a predictor of skeletal relationships was assessed by means of linear regression analysis. A statistically significant positive correlation (P < 0.01) was found between the values of overjet and ANB (r = 0.690), overjet and Wits appraisal (r = 0.750), and overjet and convexity at point A (r = 0.608) when assessing the whole sample. When linear regression between overjet and cephalometric parameters was assessed separately in Class I, Class II division 1, and Class III malocclusion subjects, the percentage of variability was statistically significant in just four pairs. The findings show that overjet is a good predictor of sagittal relationship only in subjects with a Class II division 1 malocclusion.

Influence of Facial and Occlusal Characteristics on Gummy Smile in Children: A Case-Control Study

“…Although in this study only dental malocclusion was evaluated, it is well documented that dental and skeletal malocclusions are interdependent [30,31] and therefore, it is valid to evaluate dental occlusal relationships to predict skeletal sagittal relationships. However, not using lateral cephalic X-ray images could be a limitation in the present study because other studies indicate that anterior vertical maxillary excess is one of the likely etiologic factors for GS [7,11,12,28].…”

“…[25][26][27][28][29][30][31][32][33][34] This analytical case and control study was carried out in three educational institutions in Medellin, Colombia, recruiting school children from the second to fifth grades. A population of 1,590 students was evaluated during the year September 2013 to September 2014 in order to select the case and the control group.…”

Rendimiento de la evaluación cefalométrica para el diagnóstico sagital intermaxilar: Revisión narrativa

“…Esto ocurre debido a que no existe una única prueba aceptada que determine la presencia o la severidad de la displasia esqueletal anteroposterior (32) . A pesar de ello, y de que se han reportado debilidades en relación a su desempeño en pacientes con variaciones en longitud e inclinación de la base de cráneo (19) y de los maxilares (33) , el ángulo ANB se constituye como la medida cefalométrica más comúnmente utilizada para diagnosticar las displasias sagitales esqueletales (10,19,26,(34)(35)(36) . En efecto, el uso del ángulo ANB es generalizado entre los ortodoncistas debido a que es de fácil medición, y a que sus resultados son generalmente consistentes con la presentación clínica en la mayoría de los casos.…”

“…En efecto, el uso del ángulo ANB es generalizado entre los ortodoncistas debido a que es de fácil medición, y a que sus resultados son generalmente consistentes con la presentación clínica en la mayoría de los casos. La confiabilidad de esta medida (17) se reafirma a través de su buen desempeño al evaluarse como prueba diagnóstica (10,19,26,(34)(35)(36) . Al valorar distintas medidas cefalométricas como herramienta diagnóstica, el ángulo ANB representa un test diagnóstico de alta especificidad y sensibilidad en la evaluación sagital intermaxilar.…”

Cephalometric Assessment of Sagittal Dysplasia: A Review of Twenty-One Methods

“…Zupancic et al 33 reported a study to determine whether any correlation exists between overjet value, as measured on study casts, and cephalometric parameters, which evaluate the craniofacial complex in the sagittal plane. Authors concluded that for Class I and III malocclusion, overjet is not a good predictor of sagittal dysplasia; however, for Class II division 1 malocclusion, overjet is a statistically significant predictor.…”