The Assessment of Time and Storage Environment Effects on Dimensional  Changes of Two Types of Acrylic Resin Post Patterns GC and Reliance

Amin  Khaleghi; Malihe  Taghizadeh; Mohsen  Hormozi

doi:10.18502/ijds.v17i2.6875

Amin Khaleghi Postgraduate Student, Department of Orthodontics, Dental Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Malihe Taghizadeh Dentist, Zahedan, Iran
Mohsen Hormozi Assistant Professor, Department of Prosthodontics, School of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran.

DOI: https://doi.org/10.18502/ijds.v17i2.6875

Keywords: Dental restoration, Acrylic resins, Post and core technique.

Abstract

Introduction: The purpose of this study was to investigate and compare the dimensional changes in the acrylic patterns that were stored in the different times and conditions of storage.

Materials& Methods: In this experimental study The sample number was 28 in 4 groups. The mixed paste of acrylic samples were placed inside a metal mold and after setting time with the slightest of deformations it was removed. Using this method 28 samples were prepared for each material. The diameters of samples were then measured immediately using a digital caliper with a precision of 0.01 mm. The samples were then divided into four quadruple groups and stored at 22° C room temperature, 22° Cat water, Dry 4° C environment and 4° C water. The dimensions of the four groups were measured at intervals of 1, 8, 24, and 48 hours after polymerization and being removed from the metal molds. The ANOVA test was used for data analysis (p value = 0.05).

Results: The findings of the current study showed that the dimensional changes of Duralay and GC acrylic resins at both 4 and 22° C in dry and water environments are decreasing over time (p value < 0.001). This study indicated that the contraction rate of two types of acrylic resins, Duralay and GC, at two temperatures of 4 and 22° C, and dry and humid conditions and at various times were not different.

Conclusion: Dimensional changes in of the two types of acrylic resin, Duralay and GC, During the lapse, the procedure is going to be decreased but have not seen any statistical difference between these type of acrylic resin in environment storage.