Objective: The aim of this study was to determine the pericervical dentin thickness from the outer perimeter of the mesio-buccal canals (MB1 and MB2) towards to the external surface limit of the MB root of maxillary first molars using micro-CT. Methods: One hundred and three rooted maxillary first molars displaying two root canals in the MB root, connected or not by an isthmus, were scanned at a resolution of 19.6 μm in a micro-CT device. From each specimen, two axial cross-sectioned images were selected at 2 and 3 mm above the furcation level of the MB root and evaluated regarding the dentinal thickness. Measurements were made from the outer perimeter of the MB1 and MB2 canals towards the external root surface limit from both distal (danger zone) and mesial (safety zone) aspects of the root. Non-parametric Wilcoxon signed-rank test was used to compare the dentinal thickness with a significant level set at 1%. Color-coded 3D models of dentin thickness throughout the MB root were created and qualitatively evaluated. Results: In both levels, median dentin thickness of the MB2 canal was significantly lower in either distal or mesial aspects of the root in comparison to MB1 canal (p<.01). Color-coded models indicated that dentin thickness is dependent on the cross-sectional shape of the MB root. Conclusions: Danger zone in the MB root of the maxillary first molar is not symmetrical. MB2 canal showed lower dentin thickness in both aspects of the root compared to the MB1 canal.
Albert Einstein Medical Center Philadelphia
Dr. Ordinola-Zapata obtained his DDS degree from Inca Garcilaso de la Vega University in Lima Peru, in 2001. From 2007 to 2013 he completed his Master degree and PhD doctoral Degree in Endodontics at University of Sao Paulo, Bauru school of Dentistry in Brazil. He has authored and co-authored more than 60 scientific articles in peer-reviewed journals such as the International Endodontic Journal, Journal of Endodontics, Dental Traumatology, Acta Odontologica Scandinavica, and triple O. His principal research interests are: Cone -beam CT in Endodontics, Microcomputed tomography, Dental Anatomy, Bacterial Biofilms, Confocal Laser Scanning Microscopy and evaluation of new root-filling materials. Dr Ordinola-Zapata has lectured in several countries including, Peru, Brazil, Argentina, Chile, Paraguay, Ecuador, Mexico, USA, Portugal and Spain. Currently he is an AEGD resident at Larkin community Hospital in Miami, Florida and Associate Editor of the International Endodontic Journal.
Thursday, April 26
10:00 AM – 1:00 PM