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. 2010 Sep-Oct;18(5):528-32.
doi: 10.1590/s1678-77572010000500017.

Effect of the simulated periodontal ligament on cast post-and-core removal using an ultrasonic device

Manoel Brito-Junior  1 , Neilor Mateus Antunes Braga, Danilo Costa Rodrigues, Carla Cristina Camilo, André Luis Faria-e-Silva
Affiliations

Effect of the simulated periodontal ligament on cast post-and-core removal using an ultrasonic device

Manoel Brito-Junior et al. J Appl Oral Sci. 2010 Sep-Oct.

Abstract

Objective: The aim of this study was to evaluate the effect of simulated periodontal ligament (SPDL) on custom cast dowel and core removal by ultrasonic vibration.

Material and methods: Thirty-two human maxillary canines were included in resin cylinders with or without SPDL made from polyether impression material. In order to allow tensile testing, the roots included in resin cylinders with SPDL were fixed to cylinders with two stainless steel wires. Post-holes were prepared by standardizing the length at 8 mm and root canal impressions were made with self-cured resin acrylic. Cast dowel and core sets were fabricated and luted with Panavia F resin cement. Half of the samples were submitted to ultrasonic vibration before the tensile test. Data were analyzed statistically by two-way ANOVA and Tukey's post-hoc tests (p<0.05).

Results: The ultrasonic vibration reduced the tensile strength of the samples directly included in resin cylinders. There was no difference between the values, whether or not ultrasonic vibration was used, when the PDL was simulated. However, the presence of SPDL affected the tensile strength values even when no ultrasonic vibration was applied.

Conclusion: Simulation of PDL has an effect on both ultrasonic vibration and tensile testing.

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Figures

Figure 1
Figure 1
Experimental design
Figure 2
Figure 2
Custom cast dowel and core luted in a sample with simulated periodontal ligament. Note the presence of two wires in order to prevent the root dislodgement during testing
Figure 3
Figure 3
Application of ultrasonic vibration
Figure 4
Figure 4
Application of tensile load at samples until dislodgment of the custom cast dowel and core. A and B - without simulated periodontal ligament; C and D - with simulated periodontal ligament
See this image and copyright information in PMC

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