research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Evaluation of the effect of some denture cleansers on the colour of acrylic resin denture base materials

Authors: Munther N Kazanji --- Zina M Ahmad
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 2 Pages: 79-86
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

The aims of this study were to evaluate the effect of denture cleansers on the colour of acrylic resin denture base material, and to evaluate the effect of particle size and surface roughness of acrylic resin material on their colour change. Sixty four acrylic specimens were prepared from the three types of acrylic resin materials of 30×20×1.5 mm (length× width× thickness, respectively). After the conditioning in distilled water, they were immersed in eight types of denture cleansers for 7 days. The colour changes were assessed using a computerized ultraviolet–visible spectrophotometer with accuracy up to 0.001. Visual examination of colour change was done by three independent examiners. The analysis of particle size was performed with a sieving machine. The surface roughness of acrylic specimens was measured using a computerized surface texture measuring and recording machine (Perthometer). A statistical analysis was performed using analysis of variance and Duncan's Multiple Range Test. The results revealed that there was a significant difference at p  0.01 between the tested solutions and also between the three types of acrylic resin materials. It was concluded that denture cleansers induced colour change of acrylic resin denture base materials. The self–curing acrylic exhibited the highest colour change. The smaller particle size and the smoothest surface of resin materials decreased the amount of colour change.


Article
Effects of aluminum oxide addition on the surface roughness and hardness of acrylic resin denture base

Author: Makarem Abdul-Rassol Jaber مكرم عبد الرسول جبار
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2015 Volume: 3 Issue: 1 Pages: 32-38
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

Problem: Acrylic dentures frequently fracture during service due to their poor strength characteristic. Several attempts have been carried out to improve strength of acrylic by addition some materials such as fibers or Aluminum oxide. The purpose of this study was to evaluate the effect of adding Aluminum oxide (AL2O3) on the surface roughness and hardness of heat cure acrylic resin denture base material.Materials and Methods: 60 specimens were made from the heat cure acrylic resin denture base after being cured in microwave oven, 30 specimens prepared for surface roughness test and these where subdivided according to concentration of AL2O3 into three subgroups as follow:Group (A): 10 specimens of acrylic resin without AL2O3 (control group)Group (B): 10 specimens of acrylic resin+2.5% by weight AL2O3Group (C): 10 specimens of acrylic resin +5% by weight AL2O330 specimens prepared for surface hardness test and these where subdivided according to concentration of AL2O3 into three subgroups as follow:Group (A): 10 specimens of acrylic resin without AL2O3 (control group)Group (B): 10 specimens of acrylic resin+2.5% by weight AL2O3Group (C): 10 specimens of acrylic resin +5% by weight AL2O3The average of the surface roughness of the samples has been determined with using the profilometer (surface roughness tester)¸ also the average of the surface hardness of the samples has been determined with using surface hardness tester (digital micro Vickers).Result: The results showed that there were no statistically significant differences in the surface roughness and hardness.Conclusion: The addition of aluminum oxide in low percentage not affected on the surface roughness and hardness of heat cure acrylic resin.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2015 (1)

2004 (1)