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Comparison of some properties of four provisional restorations resin: Trim, Tempron, Acropars TRII & Duralay (Aria Dent)
A. Monzavi , S. Zarati , T. Jafarzadeh , Mh. Amini ,
Volume 19, Issue 3 (6-2006)
Abstract

Background and Aim: Use of provisional restorations is one of the important phases in the treatment of patients who need fixed prosthesis. Some physical properties are required for these materials. The purpose of this study was the comparison of some physical properties of 4 kinds of resins: Trim, Tempron, Duralay (Aria Dent) and Acropars TRII.

Materials and Methods: In this experimental study, transverse-strength (TS), setting time (ST), polymerization shrinkage (PS) and temperature rise (TR) during polymerization were tested. In transverse strength test, 5 samples of each resin were made. TS testing was done with an Instron testing machine. ST testing (5 samples in each group) was done with Gilmore needle. In PS test, 11 cylindric samples were prepared from each resin and the shrinkage was examined with digital micrometer (up to 24 hours). In TR test, after mixing the powder and liquid of resins (8 samples in each group), the temperature rise was recorded with 10 seconds interval (up to 15 minutes). Data were analyzed with one-way ANOVA and Tukey HSD tests with p<0.05 as the limit of significance.

Results: In TS test, all samples of Trim were bent and no fracture was observed, while Tempron and Duralay showed no significant difference. Both Tempron and Duralay revealed high significant difference with Acropars TRII (P <0.01). In ST test, the difference between groups was significant (P<0.01). The lowest ST was observed in Acropars TRII (7 min), and the highest in Tempron (9.53 min). In PS test, significant difference was observed between Trim and Acropars TRII (P<0.01). PS was completed after 120 min in Tempron and Trim groups. However, PS continued to increase in other groups. In TR test, the difference between groups was significant (P<0.05). Duralay showed the highest TR and the lowest was seen in Trim.

Conclusion: In this study, Trim showed better properties than other studied groups. Acropars TRII had the lowest strength. The highest temperature rise was recorded for Duralay and Tempron, respectively.


Evaluation of dimensional changes and detail reproduction of three type IV dental gypsums
Somayeh Hekmatfar, Sahar Mousavi, Hamed Mohammadian, Karim Jafari,
Volume 32, Issue 2 (10-2019)
Abstract

Background and Aims: Gypsum products are used for several different purposes. Adaptation and success of casting restorations are dependent on dimensional accuracy, strength, and reproduction of details of dental gypsums. This study was designed to evaluate the dimensional changes and accurate details reproduction of three type IV dental gypsums.
Materials and Methods: 60 samples in 3 groups of dental gypsums of G30,Yeti Rock and FujirockEP were evaluated. The detail reproduction of 50 micron scratched line was analyzed by a microscope at 12× magnification. The samples were assayed for dimensional changes at 2 and 24 hours and 1 week after pouring. Photograph images were taken from samples in fixed distance by a camera (Canon D600) and analyzed in corel draw software. Data were analyzed using ANOVA and chi-square (P<0.05).
Results: There were significant differences in the details reproduction between three gypsums (P≤0.05) and the highest values was for Fujirock EP, Yeti Rock. The G30 did not reconstruct the details. There was no significant difference in the dimensional changes of the evaluated gypsums based on time (P≥0.05).
Conclusion: All three different gypsums evaluated in this study showed the dimensional stability during one week. Fujirock EP and Yeti Rock could reconstruct the details and G30 gypsum could not.

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