Piecewise Straight Line Approximation of Curve Existing in Slightly Curved Mesiobuccal Root Canal of Mandibular First Molar: A Radiographic Investigation Aproximaci車n a Segmentos de L赤nea Recta en la Curva Existente del Canal Radicular Mesiobucal Ligeramente Curvado del Primer Molar Inferior: Una Investigaci車n Radiogr芍fica

作者：J Prabhakar; M S Priya; L Jones Tarcius Doss; V G Sukumaran

来源：International Journal of Morphology, 2013.

• Aproximacion a segmentos de linea recta
• Curvatura del canal
• Canal mesiobucal
• Metodo de Schneider
• Radio de curvatura
• Simulacion del canal
• angulo de curvatura
• Piecewise straight lines
• Canal curvature
• Mesiobuccal canal
• Schneider method
• Curvature radius
• Canal simulation
• Angle of curvature

The aim of this study was to radiographically investigate the curve existing in slightly curved mesiobuccal canal of mandibular first molar by applying Piecewise straight line approximation. Extracted human mandibular molars were radiographed and one hundred radiographs were selected whose mesiobuccal canal showed slight curvature (10-20～) according to Schneider%26apos;s method. The curves were traced and analyzed using Piecewise straight line method. Each curve was considered as a unit consisting of six different pieces of straight lines joining at seven specific points and the angle of curvature at these points was determined using the slope formula. All curves analyzed in this study had varying degrees of curvatures at different points on the curve. Maximum curvature (0.40～) was recorded at the middle third of the root canal. Within the limitation of the study, significant curvature occurs through out the curve existing in the mesiobuccal canal of mandibular first molar and the middle third of the curve showing greater degree of curvature. There is a possibility of greater curvature occurring in the coronal third of the curve. Though three dimensional studies would be more appropriate, Piecewise straight line approximation may be a better method than existing methods to simulate canal geometry. El objetivo de este estudio fue investigar radiogr芍ficamente la curva existente en el canal radicular mesiobucal ligeramente curvado del primer molar inferior mediante la aplicaci車n de aproximaciones a segmentos de l赤nea recta. Se utilizaron molares inferiores humanos extra赤dos que fueron radiografiados. Fueron seleccionadas, seg迆n el m谷todo de Schneider, 100 radiograf赤as cuyo canal mesiobucal mostr車 una ligera curvatura (10-20～). Las curvas fueron delineadas y analizadas mediante el m谷todo de aproximaci車n a segmentos de l赤nea recta. Cada curva se consider車 como una unidad que consta de seis diferentes segmentos de l赤nea recta que unen a siete puntos espec赤ficos y el 芍ngulo de curvatura en estos puntos se determin車 utilizando la f車rmula de la pendiente. Todas las curvas analizadas en este estudio ten赤an diversos grados de curvaturas en diferentes puntos de la curva. La curvatura m芍xima (0,40～) se registr車 en el tercio medio del canal radicular. Dentro de la limitaci車n del estudio, una curvatura significativa se produce a trav谷s de la curva existente en el canal mesiobucal del primer molar inferior y el tercio medio de la curva que muestra un mayor grado de curvatura. Existe la posibilidad que ocurra una mayor curvatura en el tercio coronal de la curva. Aunque un estu