EFFECT OF ALUMINUM OXIDE ADDITION ON COMPRESSIVE STRENGTH, MICROHARDNESS AND SETTING EXPANSION OF DENTAL PLASTER.
Journal Title: International Journal of Advanced Research (IJAR) - Year 2019, Vol 7, Issue 9
Abstract
Introduction: Gypsum products are widely used in clinical dentistry for construction of dental models (casts) and dies. The ideal requirement of model and die materials include a high compressive strength and resistance to abrasion, in addition to high dimensional stability. Dental plaster, stone, and improved stone are the three types of gypsum products used in dentistry differ in their physical and mechanical characteristics. Although dental plaster is considered as the least expensive of the three gypsum products, but their low strength, microhardness and dimensional stability limit their use as mater cast and die materials. Aim: The aim of this study was to evaluate the effect of addition of 15 weight% aluminum oxide fillers on compressive strength, microhardness and setting expansion of the dental plaster. Materials and Methods: A total of 60 specimens; 30 specimens per each group were prepared. The control group was made by mixing dental plaster with water. The other group was made by addition of 15 wt.% aluminum oxide fillers to the conventional dental plaster prior to mixing with water. Water-powder was done according to the manufacturer?s recommendations among all groups. After 24 hours compressive strength, surface microhardness and setting expansion were evaluated by Universal testing machine; Vickers microhardness testing and extensometer respectively. Results: Dental plaster reinforced by 15 wt.% aluminum oxide fillers demonstrated higher mean compressive strength and microhardness values, while lower mean setting expansion values compared to that of conventional dental plaster (p < 0.05). Conclusion: Dental plaster reinforced by 15 wt.% aluminum oxide fillers could be used alternatively to type IV: high strength dental stone (improved stone) to be used as master cast and die materials.
Authors and Affiliations
Tamer M. Hamdy.
Keywords
Related Articles
- EP ID EP656778
- DOI 10.21474/IJAR01/9711
- Views 82
- Downloads 0
PERCEPTION OF TAX OFFICE EMPLOYEES FOR THE USE OF BLOCKCHAIN TECHNOLOGY IN TAX OFFICE.
The blockchain technology, which is expected to find a wide range of applications in the years to come, is remarkable in recent years in terms of private and public sectors with the ability to record many data, provide d...
COMPARATIVE STUDY OF RELATIONSHIP BETWEEN MEMORY STRENGTH, DEMOGRAPHIC VARIABLES AND SLEEP TIMING AMONG NORMAL ADULT PEOPLE: A CASE-CONTROL STUDY IN IRBID GOVERNORATE / JORDAN.
Most of researches studied the effects of sleep deprivation or sleep disorders. Others studied the mechanism of sleeping function. In this study, the participants were normal adult people who had different time of sleepi...
INFLUENCE OF ABUTMENT EVALUATION ON DESIGNING OF FIXED PARTIAL DENTURE: A NEW STUDY.
Fixed partial denture (FPD) substitution for teeth have taken a assortment of designs throughout the years. Many corpus involved in the preparation and construction of fixed prostheses are still dominating, although more...
BASIC EDUCATIONAL MANAGEMENT BY REGENCY/CITY GOVERNMENTS IN MALUKU.
This Research aims to find out the sense of responsibility for basic education management by Regency/City governments in Maluku. The Research method used in this study is Empirical Law. The results of the study indicate...
ANALYTICAL METHOD DEVELOPMENT AND VALIDATION OF STABILITY INDICATING RPHPLC METHOD FOR ESTIMATION OF AMLODIPINE BESYLATE AND CELECOXIB IN SYNTHETIC MIXTURE.
A simple, rapid, economical, precise and accurate HPLC method for simultaneous estimation of Celecoxib and Amlodipine Besylate in their combined dosage form has been developed. A Stability indicating reverse phase high p...