Mechanical and thermal properties of polyamide versus reinforced PMMA denture base materials
The Journal of Advanced Prosthodontics
;
: 153-160, 2013.
Artículo
en Inglés
| WPRIM
| ID: wpr-14715
ABSTRACT
PURPOSE:
This in vitro study intended to investigate the mechanical and thermal characteristics of Valplast, and of polymethyl methacrylate denture base resin in which different esthetic fibers (E-glass, nylon 6 or nylon 6.6) were added. MATERIALS ANDMETHODS:
Five groups were formed control (PMMA), PMMA-E glass, PMMA-nylon 6, PMMA-nylon 6.6 and Valplast resin. For the transverse strength test the specimens were prepared in accordance with ANSI/ADA specification No.12, and for the impact test ASTM D-256 standard were used. With the intent to evaluate the properties of transverse strength, the three-point bending (n=7) test instrument (Lloyd NK5, Lloyd Instruments Ltd, Fareham Hampshire, UK) was used at 5 mm/min. A Dynatup 9250 HV (Instron, UK) device was employed for the impact strength (n=7). All of the resin samples were tested by using thermo-mechanical analysis (Shimadzu TMA 50, Shimadzu, Japan). The data were analyzed by Kruskal-Wallis and Tukey tests for pairwise comparisons of the groups at the 0.05 level of significance.RESULTS:
In all mechanical tests, the highest values were observed in Valplast group (transverse strength 117.22 +/- 37.80 MPa, maximum deflection 27.55 +/- 1.48 mm, impact strength 0.76 +/- 0.03 kN). Upon examining the thermo-mechanical analysis data, it was seen that the E value of the control sample was 8.08 MPa, higher than that of the all other samples.CONCLUSION:
Although Valplast denture material has good mechanical strength, its elastic modulus is not high enough to meet the standard of PMMA materials.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Polímeros
/
Caprolactama
/
Dentaduras
/
Polimetil Metacrilato
/
Bases para Dentadura
/
Módulo de Elasticidad
/
Vidrio
/
Nylons
Idioma:
Inglés
Revista:
The Journal of Advanced Prosthodontics
Año:
2013
Tipo del documento:
Artículo
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