Restor Dent Endod.  2020 May;45(2):e11. 10.5395/rde.2020.45.e11.

Micro-computed tomographic evaluation of the flow and filling ability of endodontic materials using different test models

• Torres FFE
• Guerreiro-Tanomaru JM
• Chavez-Andrade GM
• Pinto JC
• Berbert FLCV
• Tanomaru-Filho M

• KMID: 2503508
• DOI: http://doi.org/10.5395/rde.2020.45.e11

Abstract

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.

Keyword

Dental materials; Endodontics; Methods; X-ray microtomography

Figure

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  Figure 1 Illustration of the test models with a central cavity and lateral grooves manufactured with different dimensions: 1 × 1 × 2 mm, 1 × 1 × 1 mm, and 1 × 2 × 1 mm (length, width, and height).

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  Figure 2 Illustration of the flow and filling ability evaluation process before the assessment using micro-computed tomography. The bottom glass plate with the endodontic cement placed in the central cavity (A). A view representing the assembled device, with the bottom glass plate, the top glass plate, and the metal weight over the cement (B). Another view representing the assembled device, using transparency to show the bottom plate and the metal weight over the material after flow inside the grooves (C).

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  Figure 3 Illustration created in the CTVox software showing the assembled device composed of the bottom glass plate, the cement after flow inside the grooves, and the top glass plate during the scanning process on micro-computed tomography. The flow and filling representation were performed in 3 dimensions using the CTVol software. Central cavity filling (CCF) and lateral cavity filling (LCF) were evaluated using the CTAn software.

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