|
KMID : 0362120180400010033
|
|
Journal of Technologic Dentistry
2018 Volume.40 No. 1 p.33 ~ p.40
|
|
|
Influence of mechanical properties of ultra-dental stone on setting methods
|
|
Im Yong-Woon
Hwang Seong-Sig
Kim Sa-Hak
Choi Je-Woo
Jeoung Su-Ha
Kim Si-Chul
|
|
|
Abstract
|
|
|
Purpose: The purpose of this study was to investigate the influence of mechanical properties of various ultra-dental stone by setting methods.
Methods: 240 cylinder specimens(10 mm × 20 mm) were prepared from three ultra-dental stones(Gemma, Die keen and Fuji rock; n = 80) in accordance with the manufacturers' recommendations. Half of the specimens of each stone(n= 40) were dried in open air within a room temperature; the other half(n = 40) underwent in a silicone rubber mold in open air for 30 minutes and then were dried in a microwave oven for 10 minutes to 600W. Compressive strength(CS), compressive modulus(CM) and diametral tensile strength(DTS) conducted until fracture using Instron 5966 at each of the following periods: 1 and 24 hours from mixing. One-way analysis of variance and Scheffe's post hoc test were performed for statistical comparisons at a significance level of P<.05.
Results: The CS and CM values in all dental stone indicated highest after 24h(54.25 MPa < ) than the values for specimens dried in microwave method . The DTS values revealed the highest microwave method. However, in 24h, FJ(Fu-ji rock) and GM(Gemma) had lower mechanical properties than air.
Conclusion : Within the limitations of this study, CS did not influence by microwave method but DTS affected according to the setting.
|
|
|
KEYWORD
|
|
|
Ultra dental stone, Compressive strength, Diametral tensile strength
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|