Rogério Albuquerque Azeredo

Avaliação da presença do canal cavo inter-radicular em molares pelo método da microscopia eletrônica de varredura

Introduction The pulp cavity is still a mystery to be solved, because there may be numerous branches that need to be clarified so that the clinician can interpret and develop its role properly. One of the anatomical variations, which presents great controversy in the literature, is the recognition of the presence of the furcation canal. This canal comes from the pulp chamber floor, traverses the inter-radicular dentin and reaches the periodontal ligament in furcation region, constituting one of the lines of communication between the periodontal ligament and the pulp tissue, and may serve as a means of contamination. Objective To study the frequency of furcation canals in molars. Material and method Review of 5 (five) maxillary first molars, 10 (ten) maxillary seconds molars, 10 (ten) mandibular first molars and 10 (ten) mandibular seconds molars, using scanning electron microscopy. Result It was observed the presence of foramina in 30 floors and 50 of furcas of the mandibular first molar and 40 and 60 on the floor and furca of the mandibular second molar, respectively. The diameter of these foraminas ranged from 32 µm up to 312 µm. Conclusion The prevalence of furcation canal is variable when analyzing the different methodologies.

Efeitos od laser CO2 na mandíbula de ratos: Estudo através da microscopia eletrônica de varredura

The lateral surface of the body of rat mandibles was irradiated with CO2 laser with continuous discharges of 10 watts. After three months, the groove formed by the irradiation presented fused material with diverse fractures over a great extent. After seven months, the newly-formed periosteum covered wide areas of the incision that also presented carbonized material. One year following the incision, the newly-formed periosteum consisted of collagenous fibers that formed thick bundles transversal to the incision or regular meshworks covering the incision. Traces of carbonized material were verified also at this stage that were characteristic of retardment in bone regeneration