ABSTRACT
O presente trabalho teve por objetivo investigar quantitativamente a obturação dos canais radiculares realizada em réplicas de molares em resina, usando GuttaFusion®, Thermafil® e a técnica da condensação vertical aquecida de Schilder. Vinte e um molares TrueTooth™ Replica 18-002 foram utilizados e os canais das raízes mesiais instrumentados com Reciproc® R40. Cada espécime foi escaneado em microtomógrafo computadorizado (SkyScan 1173; Bruker-microCT, Kontich, Bélgica) após o preparo químico-cirúrgico e após a obturação dos canais radiculares. Os dentes foram divididos em três grupos: Grupo I GuttaFusion®; Grupo II Schilder; Grupo III Thermafil®. Então as amostras foram microtomografadas no equipamento operado a 50 kV e 800 mA (filtros de 0.5-mm). As imagens de cada amostra foram reconstruídas no programa NRecon v.1.6.3 (Bruker-microCT, Kontich, Bélgica), gerando secções axiais de suas estruturas interiores. Para cada dente, a avaliação foi calculada ao longo de toda a extensão do canal em aproximadamente 500 fatias por amostra. Foi produzida uma imagem tridimensional (volume/ área de superfície) de cada espécime, no programa ImageJ (National Institutes of Health, Bethesda, Maryland, Estados Unidos). A partir das imagens reconstruídas, o volume da obturação foi calculado. Os dados da amostra dos canais obturados foram calculados sobre os dados dos canais instrumentados e analisados estatisticamente com os testes Kruskal-Wallis e pelo teste Mann-Whitney para comparar par a par. Os dados obtidos demonstraram que há diferença estatisticamente significante entre os grupos (p < 0,05). O grupo Thermafil® demonstrou possuir uma maior capacidade de preenchimento do espaço correspondente ao canal radicular, quando comparado ao grupo GuttaFusion® e ao grupo Schilder. Porém, não há evidência estatística que demonstre diferença entre os grupos GuttaFusion® e Schilder
The aim of this study was to investigate quantitatively the filling of root canals performed on replicas of molars, using GuttaFusion®, Thermafil® and Schilder's warm vertical condensation technique. Twenty-one molars TrueTooth™ Replica 18-002 (DELendo, Santa Barbara, California) were used and the mesial root canals instrumented with Reciproc® R40. Each specimen was submited to a µCT scan after chemical-surgical preparation and after the filling of root canals. The teeth were divided into three groups: Group I GuttaFusion®; Group II Schilder; Group III - Thermafil®. Then the samples were microscanned (SkyScan 1173; Bruker-microCT, Kontich, Belgium) operated at 50 kV and 800 mA (0.5-mm filter). Images of each sample were reconstructed in NRecon v.1.6.3 software (Bruker-microCT, Kontich, Belgium), generating axial sections of their internal structures. For each tooth, the evaluation was calculated over the entire root canal length of approximately 500 slices per sample. Then the three-dimensional image was produced (volume, surface area) of each specimen at the ImageJ software (National Institutes of Health, Bethesda, Maryland, USA), and reconstructed images and calculated the volume of the shutter. The sample data of root canals were calculated based on data from instrumented canals and statistically analyzed with Kruskal-Wallis test and Mann-Whitney test to compare pairwise. The data showed a statistically significant difference between groups (p <0.05). The Thermafil® group has demonstrated greater filling capacity of the space corresponding to the root canal compared to GuttaFusion® group and Schilder group. However, there is no statistical evidence that demonstrates the difference between GuttaFusion® and Schilder groups.
Subject(s)
Root Canal Obturation/instrumentation , Dental Instruments , X-Ray Microtomography , Statistics, Nonparametric , Endodontics/methods , Proof of Concept StudyABSTRACT
Aim: The aim of the study was to compare the conventional ThermaFil obturation technique and ThermaFil obturation with mineral trioxide aggregate (MTA) as an apical barrier, with regard to apical sealing and extrusion. Materials and Methods: Twenty extracted human canines were instrumented using a crown-down technique and divided into two groups. The experimental group was obturated using ThermaFil obturation with MTA as an apical barrier and the control group was obturated using the conventional ThermaFil obturation technique. AH Plus sealer was used in both the groups. Apical extrusion was recorded. Teeth of both the groups were coated with nail polish, except for the apical 3 mm. After 24 h, they were suspended in black India ink for 48 h. Canines were decalcified, rendered transparent, and linear dye penetration was measured under ×40 stereomicroscope. Results: There was a significant extrusion noticed in conventional ThermaFil obturation technique. Frequency of extrusion of sealer and/or gutta-percha was supposed to be evaluated using χ² test, but since the values of the samples of ThermaFil plus MTA group were zero, statistical analysis could not be conducted, whereas linear dye leakage was calculated with Mann-Whitney U test because the distribution was abnormal. Conclusion: Although ThermaFil plus MTA group showed microleakage, extrusion of sealer and the core material was prevented in comparison with conventional ThermaFil obturation technique. It is advantageous to use MTA as an apical plug as there is no fear of apical extrusion and the root canal system can then be packed three dimensionally against this barrier using any thermoplasticized gutta-percha obturation technique.
Subject(s)
Aluminum Compounds/chemistry , Calcium Compounds/chemistry , Carbon/diagnosis , Coloring Agents/diagnosis , Cuspid/ultrastructure , Dental Bonding , Dental Leakage/classification , Dental Pulp Cavity/ultrastructure , Drug Combinations , Epoxy Resins/chemistry , Gutta-Percha/chemistry , Humans , Materials Testing , Oxides/chemistry , Radiography, Bitewing , Root Canal Filling Materials/chemistry , Root Canal Obturation/methods , Root Canal Preparation/methods , Silicates/chemistry , Surface Properties , Temperature , Time Factors , Tooth Apex/ultrastructureABSTRACT
O objetivo deste trabalho foi comparar o tempo gasto pelo sistema ProFile.04 na remoção do material obturador do canal radicular em dentes obturados com o sistema Thermafil. Foram utilizados 30 caninos, divididos em dois grupos. Os espécimes foram preparados e então obturados com o sistema Thermafil. Duas semanas após a obturação, iniciou-se o retratamento com o sistema ProFile.04, sendo a velocidade no grupo I de 350 rpm e 2.000 rpm no grupo II. Os tempos de remoção foram submetidos à análise estatística, e houve diferença estatisticamente significante entre os dois grupos experimentais, sendo o grupo II mais rápido
The aim of this study was to compare the time spent through the 0.04 ProFile system in the removal of the root fillings of the root canal in teeth obturated with the thermafill system. 30 tooths, divided in two groups have been used. The specimens have been prepared and then obturated with the thermafill system. Two weeks after obturation, the fillings were removed using 0.04 ProFile instruments, being the speed in group I of 350 rpm and 2000 rpm in group II. The times of the removal have been submitted to the statistical analysis, showing significant statistical difference between the two experimental groups, being Group II faster.