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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Resistance to impact of cross-linked denture base biopolymer materials: Effect of relining, glass flakes reinforcement and cyclic loading

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Author(s):
da Cruz Perez, Luciano Elias [1] ; Machado, Ana Lucia [2] ; Vergani, Carlos Eduardo [2] ; Zamperini, Camila Andrade [2] ; Pavarina, Ana Claudia [2] ; Canevarolo, Jr., Sebastiao Vicente [3]
Total Authors: 6
Affiliation:
[1] UNIP, Dept Prosthodont, Goiania, Go - Brazil
[2] Univ Estadual Paulista, Dept Dent Mat & Prosthodont, BR-14801903 Sao Paulo - Brazil
[3] Univ Fed Sao Carlos, Dept Mat Engn, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 37, p. 33-41, SEP 2014.
Web of Science Citations: 2
Abstract

Aims: The effect of reinforcement and cyclic loading on the resistance to impact (RI) of denture base biopolymer materials was evaluated using Charpy (C) and falling-weight (FW) impact tests. Methods: Bar-shaped (60 x 6 x 2 mm(3)) and denture-shaped specimens (2 mm) for the C and FD tests, respectively, were prepared with Lucitone 550 (L) and Vipi Wave (V) and relined (2 mm) using the same material or the autopolymerizing relining resins Tokuyama Rebase II (T) and Ufi Gel Hard (U). Bulk specimens (60 x 6 x 4 mm(3)) of all materials (L, V, T and U) were also prepared and tested. To evaluate the effect of reinforcement, glass flakes were added to the powder of the relining resins T and U (5% by weight). Half of bar-shaped (n=320) and half of the denture-shaped specimens (n=480) were subjected to cyclic loading (10,000 cycles) before the impact tests. Results: Data were analyzed by one-way ANOVAs (alpha=0.05) and revealed that the RI of L and V were comparable and higher than those of U and T. Compared to L and V, the RI was increased by relining with T and decreased by relining with U. When relining was made using the same material (L and V) the RI was maintained. Flexural cyclic loading and the incorporation of glass flakes into the resins T and U did not cause any significant alteration in the RI. A high correlation between results from C and FW tests was observed (r=0.8854). Conclusion: Relining may exert effects on the RI of L and V denture base resins, which vary according to the relining material used. The high correlation between C and FW, suggests that the Charpy test, using bar-shaped specimens, can be a simple and reliable method for evaluating factors that may influence the RI of denture base polymers. (C) 2014 Elsevier Ltd. All rights reserved. (AU)