research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
Effect of Mouth Rinses on Surface Roughness of Two Methacrylate-Based and Siloraine-Based Composite Resins

Author: Ala’a Jawad Kadhim علاء جواد كاظم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 3 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

ABSTRACTBackground: Various fluids in the oral environment can affect the surface roughness of resin composites. This in vitrostudy was conducted to determine the influence of the mouth rinses on surface roughness of two methacrylatebasedresin (nanofilled and packable composite) and siloraine-based resin composites.Materials and methods: Disc-shaped specimens (12 mm in diameter and 2mm in height) were prepared from threetypes of composite resin materials: Filtek™ Z350 XT, Filtek™ P60 and Filtek™ P90.Thirty specimens were prepared fromeach composite type and subdivided into three subgroups (n=10) according to the type of treatment solution:distilled water (control), Listerine (alcohol-containing), Sensodyne Pronamel (alcohol free fluoride- containing).Eachsubgroup was immersed in 20 ml of treatment solutions and incubated at 37°C for 24 hr and then subjected tosurface roughness test by profilometer .The resulting data were statistically analyzed using ANOVA and LSD testat0.05 significance level.Results: The results of this study showed that both mouth rinses irrespective of the presence or absence of alcoholresulted in significant increase in the surface roughness of the tested resin composite materials compared to controlwith no significant difference between the two mouth rinses. Comparison among the three types of resin in eachtreatment solution showed that there was a statistically high significant difference in surface roughness between allsubgroupsConclusion: Both alcohol-containing and alcohol-free fluoride containing mouth rinses cause highly significantincrease in surface roughness of composite resins. Composite changes depended on the material itself rather thanthe mouth rinse solution used.


Article
Comparative evaluation of the radiographic density of GuttaFlow® 2 in different obturation techniques using Spiral Computed Tomography

Authors: Nagham A. AL-Hyali --- Ala,a Jawad Kadhim
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2018 Volume: 30 Issue: 4 Pages: 8-14
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Ideal root canal obturation depends on many factors; one of them is good sealing of root canal without pores. The aim of this study was to determine the radiographic density of GuttaFlow® 2 with different obturation techniques using spiral computed tomography.Materials and Methods: Forty palatal roots of permanent maxillary first molar were used in this study. Following working length determination, root canal was prepared using rotary PROTAPER universal system. They were randomly divided into four groups of 10 roots each, the groups are Conventional lateral condensation with Apexit Plus sealer, Conventional lateral condensation with GuttaFlow® 2 as a sealer, Soft Core Regular with GuttaFlow® 2 as a sealer and single cone with GuttaFlow® 2. The experimental roots were then analyzed in both horizontal and vertical sections from the apex to coronal using Spiral Computed Tomography. The obtained data were analyzed using one-way ANOVA and Tukey tests at a level of significance of 0.05.Results: Statistical analysis showed highly significant differences among the different areas (apical, middle and coronal) of each group. The density of obturation systems decreased in the following sequence: single cone with GuttaFlow® 2 (highest density), Soft Core Regular, Conventional lateral condensation with GuttaFlow® 2 as a sealer and finally Conventional lateral condensation with Apexit Plus sealer (lowest density)Conclusion: None of the tested obturation techniques can achieve ideal three-dimensional dense obturation. Single . 2 shows the best results


Article
Effect of 38%hydrogen peroxide agent on color change of composite resins stained with tea and coffee beverages (An in vitro study)

Loading...
Loading...
Abstract

Background: The esthetic application of bleaching materials has gained popularity,with consequences for teeth and restorative materials. The purpose of this an invitro study was to investigate the effect of in-office bleaching agent (38%hydrogen peroxide) on the color change of three composite resins after stainingwith tea and coffee beverages.Materials and Methods: Sixty disc-shaped samples from three different compositeresins (Tetric Ceram, Tetric Flow and Tetric Evo Ceram) were used in this study.The samples of each group were randomly divided into two subgroups accordingto type of beverages (tea and coffee) used for staining of samples. After stainingof composite resins the total color change (ΔE1 ) was calculated usingspectrophotometer, then the samples immersed in WHITEsmile® office bleachingagent for 15 min x 3 times with a 7 days interval followed by ΔE2 calculation.Data were subjected to the ANOVA, LSD and student t-test at 0.05 significancelevel.Results: The results revealed that, there was clinically significant color change ΔE>3.3 with a statistically highly significant differences (P=0.000) for all the groups.Coffee causes more discoloration than tea. After bleaching, the samples becamewhiter in color and only appreciable by skillful operator but considered clinicallyacceptable ΔE1 - ΔE2 < 3.3.Conclusion: Tea and coffee beverages causes discoloration in composite but thiseffect was depended on the type of beverages and composite resins. The most ofcolor change occurred with Tetric Flow composite resin after immersion in coffeebeverage. The bleaching agent (38% hydrogen peroxide) can remove the stainingof composite resins and make its color clinically acceptable.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (2)


Year
From To Submit

2018 (1)

2016 (1)

2012 (1)