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Article
The Effect of Various Bur Types, Bond-ing Agents, and Composite Types on The Microleakage of Resin Composites

Author: Raghad A Al-Askry
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 1 Pages: 176-185
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This in vitro study was conducted to investigate the effect of various bur types, bonding agents, and resin composite restorative materials on the microleakage at occlusal and gingival tooth/composite interfaces. Materials and methods: One hundred and sixty non carious, extracted human premolars were mounted in acrylic resin, the teeth were randomly divided into four groups (n=40) according to the bur types (diamond round bur, diamond fissure bur, carbide round bur, and carbide fissure bur). A standardize class V (3×2×2) mm dimensions cavity was prepared on the facial surface of each tooth (each group with corresponding bur type), then each group was divided into two subgroups (n=20) ac-cording to the type of adhesive systems used (P&B NT,& I-Bond), after that each subgroup farther divided in to two subgroups (n=10) according to the type of composite restorative materials (Arabesk & Tg) the final number of groups were (16) of (10) teeth in each. After the specimens were finished they stored for one month in 37ºc distilled water, thermo cycled for 500 cycles between (5ºc & 55ºc) and immersed in 0.5% methylene blue solution for 24h., and then sectioned longitudinally. For both occlusal and gingival margins, dye penetration at the tooth/composite interfaces were scored from 0-3 under stereomicroscope at a magnification x10, data were analyzed using unpaired T-test, ANOVA, and Duncan’s multiple rang test at 5% significant level. Results: T-test represent that there was less microleakage at occlusal margins than the gingival margins. ANOVA and Duncan’s multiple rang tests show that the less leakage was occurred with the use of carbide fissure bur at both occlusal and gingiv-al margins while the diamond round bur show the highest leakage at both margins. P&B NT show less leakage than I-Bond at the occlusal margin but there was no significant difference between P&B NT & I-Bond at the gingival margins also there was no significant difference between the ( Arabesk & Tg ) restorations at both occlusal and gingival margins. Conclusions: Within the limitations of this study results show that there was less microleakage at the occlusal margin than that at the gingival margins, and the use of carbide fissure bur to prepare the cavities for receiving resin composite materials show the least microleakage than other type of burs, and although phosphoric acid has been intensely used to etch the dental substrates (enamel and dentin) for providing a good bonding, self-etching adhesives can be considered an alternative methods to provided a good bonding for restorative procedures


Article
Sealing Ability of Different Retrograde Filling Materials

Authors: Raghad A Al-Askry --- Neam N Al-Yousifany --- Nawfal A Zakaria
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 1 Pages: 38-50
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The study aims to evaluate the antimicrobial effect of different concentrations of alcoholic
extract of Olive Leaves solution (0.1%, 0.2%, 0.4%, 0.6%, 0.8%) in an in vitro.It also to determines
the time required for the most effective concentration of Olive Leaves to start the effect in selected
microorganisms, and to evaluate the antimicrobial effect of most effective concentrations of alcoholic
extract of Olive Leaves solution in an in vivo study as a root canal irrigant. Materials and Methods:
The antimicrobial effect of Olive Leaves (0.1%, 0.2%, 0.4%, 0.6%, 0.8%), 2.5% sodium hypochlorite,
and normal saline were determined in vitro by using broth microdilution method. The direct exposure
test was used to evaluate the time required for 0.8% of Olive Leaves to start their antimicrobial effect
on the selected microorganisms. In an in vivo study, 36 uniradicular teeth with necrotic pulps were
chosen. The patients were divided randomly into three groups, 12 patients for each group as in the
following: Group I: alcoholic extract of Olive Leaves at 0.8%. Group II: sodium hypochlorite solution
at 2.5% as a positive control. Group III: normal saline as a negative control. Bacteriological samples
were obtained from the canal at the beginning of the first appointment; at the beginning of the second
appointment; at the end of the second appointment; at the beginning of the third appointment using
sterile wet paper point. Results: The Results showed that Olive Leaves at (0.2%, 0.4%, 0.6%, 0.8%),
and sodium hypochlorite had a significant antimicrobial effect against aerobic and anaerobic bacteria
recovered from teeth with necrotic pulps. While the normal saline and 0.1% Olive Leaves had no
significant antimicrobial effect. As for Olive Leaves exract. The best antimicrobial effect was noticed
at 0.8%, which showed a significant difference from other concentrations of Olive Leaves,but no
significant difference from that of sodium hypochlorite. The results of this test showed that 2.5%
sodium hypochlorite and 0.8% Olive Leaves had immediate effect on all selected microorganisms. The
results revealed that 0.8% alcoholic extract of Olive Leaves solution had a significant antimicrobial
effect when utilized clinically as an endodontic irrigant, which was not significantly differ from sodium
hypochlorite but significantly different from normal saline. Conclusions: Olive Leaves alcoholic
extract solution at 0.8% was an effective antimicrobial agent when used as an irrigant in endodontic
treatment of teeth with necrotic pulps.

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Article
Microleakage of Repaired Amalgam

Authors: Neam N. Al–Yousifany --- Nawfal A. Zakaria --- Raghad A. Al–Askry
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2008 Volume: 8 Issue: 1 Pages: 44-49
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This invitro study designed to investigate the effect of bonding agent on amalgam repaired with either spherical or admixed alloy. Material and Methods: Cl I cavity preparations were made on theocclusal surface of hundred and twelve extracted human premolars. The teeth were randomly divided into two groups, 56 cavities filled with spherical amalgam and the other 56 cavities filled with admixedamalgam, after aging of restorations, buccal half of the previously placed restorations were removed and each group was divided into two subgroup according to the lining material used. The final numberwere eight groups of 14 teeth in each. All specimens were thermocycled for 500 times with 15 second dwell time. The samples were stained with 2% methylene blue, sectioned and evaluated for dye penetration.The data were analyzed by Fisher Freeman Halton test.Results: There was a significant differences in microleakage of bonded and non–bonded specimens, the use of bonding agent significantly increase the microleakage of repaired amalgam. Repairing amalgam with similar alloy type significantly reduce the microleakage.Conclusions: Within the limitation of this study, repairing amalgam with bonding agent is acceptable but significantly less microleakage can observed when amalgam repaired without bonding agents. malgam alloy can repaired with different types of alloy, but better marginal seal accomplished when the same types of alloy used for repair

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