Computed Tomography-Guided Bone Block Harvesting From the Mandibular Ramus/Toma de Bloque Oseo de Rama Mandibular Guiada por Tomografia Computadorizada

The aim of this study was to ascertain the distance from the mandibular canal to the lateral, medial and upper zones of the mandibular ramus in order to identify safety margins that reduce the risk of nerve injuries in the process of removing a bone graft. A descriptive study was conducted, analyzin...

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Bibliographic Details
Published in:International journal of morphology Vol. 36; no. 1; p. 362
Main Authors: Parra, Marcelo, Jara, Jaime, Navarro, Pablo, Vasquez, Belgica, Olate, Sergio
Format: Journal Article
Language:Spanish
Published: Universidad de La Frontera, Facultad de Medicina 01-03-2018
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Summary:The aim of this study was to ascertain the distance from the mandibular canal to the lateral, medial and upper zones of the mandibular ramus in order to identify safety margins that reduce the risk of nerve injuries in the process of removing a bone graft. A descriptive study was conducted, analyzing bilaterally 20 CBCT exams from different patients, taking measurements at 4 points in the central, lateral and medial areas of the corresponding mandibular ramus, which was located at a distance of 5 mm between each line, starting at the distal point of the second molar. Forty hemimandibles were included in this study, estimating a vertical distance for the 4 points of analysis, from between 16 and 17 mm, a distance laterally of 5 mm approximately and medially approximately from 3 to 3.9 mm; the lateral zone was significantly larger than the medial zone. It is estimated that the maximum achievement of a bone block from the area posterior to the second molar must be 13 mm deep and 3 mm laterally to minimize the risks of injuries to the inferior alveolar neurovascular bundle. KEY WORDS: Mandibular ramus; Bone graft; Donor site. El objetivo de esta investigacion fue conocer la distancia que existe desde el canal mandibular a la zona lateral, medial y a la zona superior de la rama mandibular a fin de identificar margenes de seguridad que minimicen el riesgo de lesiones nerviosas en el proceso de retiro de un injerto oseo. Se realizo un estudio descriptivo, analizando bilateralmente 20 examenes CBCT de pacientes distintos, realizando mediciones en 4 puntos de la zona central, lateral y medial de la rama mandibular correspondiente, los cuales fueron ubicados con distancia de 5 mm entre cada linea, iniciando en el punto distal del segundo molar. Cuarenta hemimandibulas fueron incluidas en esta investigacion, estimando una distancia vertical, para los 4 puntos de analisis, de entre 16 y 17 mm, una distancia hacia lateral de 5 mm aproximadamente y hacia medial aproximadamente de 3 a 3, 9 mm; la zona lateral fue significativamente mas grande que la zona medial. Se estima, que la obtencion maxima de un bloque oseo desde la zona posterior al segundo molar debe ser con 13 mm de profundidad y 3 mm desde lateral para minimizar los riesgos de lesiones al paquete neurovascular alveolar inferior. PALABRAS CLAVE: Rama mandibular; Injerto oseo; Sitio donante.
ISSN:0717-9367