1.Micro-computed tomographic evaluation of a new system for root canal filling using calcium silicatebased root canal sealers
Mario TANOMARU-FILHO ; Fernanda Ferrari ESTEVES TORRES ; Jader Camilo PINTO ; Airton Oliveira SANTOS-JUNIOR ; Karina Ines Medina CARITA TAVARES ; Juliane Maria GUERREIRO-TANOMARU
Restorative Dentistry & Endodontics 2020;45(3):e34-
Objectives:
This study evaluated by using micro-computed tomography (micro-CT) the filling ability and sealer apical extrusion promoted by a new Sealer Injection System (SIS;Angelus) with side openings needle, in comparison with the conventional injection system, associated with a new ready-to-use calcium silicate-based sealer (Bio-C Sealer).
Materials and Methods:
Acrylic resin models containing a main curved artificial canal and 3 simulated lateral canals in apical, middle and cervical thirds were used. The main root canals were prepared using a rotary system up to size 35.05. The canals were filled with Bio-C sealer by using a single cone technique and the conventional delivery system or SIS. Samples were scanned in micro-CT. The percentage of voids throughout the entire extension of the main root canal and in each third of the lateral canals, besides the apical extrusion of the sealer was calculated. Data were submitted to t-test (p < 0.05).
Results:
There was no difference between both systems in the main root canals filling.Although the volume percentage of voids was similar in the apical and middle thirds of lateral canals, SIS had the greatest filling ability of the cervical third lateral canal. Moreover, the conventional system showed the highest apical extrusion of the sealer.
Conclusions
The conventional and SIS obturation systems had an appropriate filling ability of the main root canal. SIS had the best filling of the cervical third of the lateral canals, besides lower sealer apical extrusion, suggesting its clinical indication.
2.Micro-computed tomographic evaluation of the flow and filling ability of endodontic materials using different test models
Fernanda Ferrari Esteves TORRES ; Juliane Maria GUERREIRO-TANOMARU ; Gisselle Moraima CHAVEZ-ANDRADE ; Jader Camilo PINTO ; Fábio Luiz Camargo Villela BERBERT ; Mario TANOMARU-FILHO
Restorative Dentistry & Endodontics 2020;45(2):e11-
Objectives:
This study compared the flow and filling of several retrograde filling materials using new different test models.
Materials and Methods:
Glass plates were manufactured with a central cavity and 4 grooves in the horizontal and vertical directions. Grooves with the dimensions used in the previous study (1 × 1 × 2 mm; length, width, and height respectively) were compared with grooves measuring 1 × 1 × 1 and 1 × 2 × 1 mm. Biodentine, intermediate restorative material (IRM), and mineral trioxide aggregate (MTA) were evaluated. Each material was placed in the central cavity, and then another glass plate and a metal weight were placed over the cement. The glass plate/material set was scanned using micro-computed tomography. Flow was calculated by linear measurements in the grooves. Central filling was calculated in the central cavity (mm3) and lateral filling was measured up to 2 mm from the central cavity.
Results:
Biodentine presented the least flow and better filling than IRM when evaluated in the 1 × 1 × 2 model. In a comparison of the test models, MTA had the most flow in the 1 × 1 × 2 model. All materials had lower lateral filling when the 1 × 1 × 2 model was used.
Conclusions
Flow and filling were affected by the size of the test models. Higher grooves and materials with greater flow resulted in lower filling capacity. The test model measuring 1 × 1 × 2 mm showed a better ability to differentiate among the materials.
3.Micro-computed tomographic evaluation of a new system for root canal filling using calcium silicatebased root canal sealers
Mario TANOMARU-FILHO ; Fernanda Ferrari ESTEVES TORRES ; Jader Camilo PINTO ; Airton Oliveira SANTOS-JUNIOR ; Karina Ines Medina CARITA TAVARES ; Juliane Maria GUERREIRO-TANOMARU
Restorative Dentistry & Endodontics 2020;45(3):e34-
Objectives:
This study evaluated by using micro-computed tomography (micro-CT) the filling ability and sealer apical extrusion promoted by a new Sealer Injection System (SIS;Angelus) with side openings needle, in comparison with the conventional injection system, associated with a new ready-to-use calcium silicate-based sealer (Bio-C Sealer).
Materials and Methods:
Acrylic resin models containing a main curved artificial canal and 3 simulated lateral canals in apical, middle and cervical thirds were used. The main root canals were prepared using a rotary system up to size 35.05. The canals were filled with Bio-C sealer by using a single cone technique and the conventional delivery system or SIS. Samples were scanned in micro-CT. The percentage of voids throughout the entire extension of the main root canal and in each third of the lateral canals, besides the apical extrusion of the sealer was calculated. Data were submitted to t-test (p < 0.05).
Results:
There was no difference between both systems in the main root canals filling.Although the volume percentage of voids was similar in the apical and middle thirds of lateral canals, SIS had the greatest filling ability of the cervical third lateral canal. Moreover, the conventional system showed the highest apical extrusion of the sealer.
Conclusions
The conventional and SIS obturation systems had an appropriate filling ability of the main root canal. SIS had the best filling of the cervical third of the lateral canals, besides lower sealer apical extrusion, suggesting its clinical indication.
4.How image-processing parameters can influence the assessment of dental materials using micro-CT
Fernanda Ferrari Esteves TORRES ; Reinhilde JACOBS ; Mostafa EZELDEEN ; Karla de FARIA-VASCONCELOS ; Juliane Maria GUERREIRO-TANOMARU ; Bernardo Camargo dos SANTOS ; Mário TANOMARU-FILHO
Imaging Science in Dentistry 2020;50(2):161-168
Purpose:
The aim of this study was to evaluate the influence of voxel size and different post-processing algorithms on the analysis of dental materials using micro-computed tomography (micro-CT).
Materials and Methods:
Root-end cavities were prepared in extracted maxillary premolars, filled with mineral trioxide aggregate (MTA), Biodentine, and Intermediate Restorative Material (IRM), and scanned using micro-CT. The volume and porosity of materials were evaluated and compared using voxel sizes of 5, 10, and 20 µm, as well as different software tools (post-processing algorithms). The CTAn or MeVisLab/Materialise 3-matic software package was used to perform volume and morphological analyses, and the CTAn or MeVisLab/Amira software was used to evaluate porosity. Data were analyzed using 1-way ANOVA and the Tukey test (p<0.05).
Results:
Using MeVisLab/Materialise 3-matic, a consistent tendency was observed for volume to increase at larger voxel sizes. CTAn showed higher volumes for MTA and IRM at 20 µm. Using CTAn, porosity values decreased as voxel size increased, with statistically significant differences for all materials. MeVisLab/Amira showed a difference for MTA and IRM at 5 µm, and for Biodentine at 20 µm. Significant differences in volume and porosity were observed in all software packages for Biodentine across all voxel sizes.
Conclusion
Some differences in volume and porosity were found according to voxel size, image-processing software, and the radiopacity of the material. Consistent protocols are needed for research evaluating dental materials.