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Article
The Effect Of Light Curing Intensity On Fluoride Release From Composite Resin

Author: Manal A. Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 18 Pages: 232-237
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To find the effect of light cure intensity on polymerization of light cured composite resin(Tetric and Kerr composite resin). Which affects the amount of fluoride release from (light cure) composite resin. Materials and methods: Two types of light cure composite resins material (Tetric ceram and Kerr are used in this study, three groups of samples were made from each type of material used each group contain 10 samples which are cured by light cured device with different intensity of light cure.The first group of samples were cured by light the intensity of the light cure was 170 Mw/cm2. The second group of samples were cured by the intensity of 300 Mw/cm2 , third group of samples were cured at the intensity of 470 Mw/cm2. Results: The amount of fluoride released from all samples were determined in (milli volt)then convert to ppm(part per million).The amount of fluoride release in to deionized water from materials at the high intensity were less from the amount of the fluoride release from the materials that cured at low intensity. Conclusions: The amount of the fluoride from the light cured composite resins material which cured at the high intensity is less than the amount of the fluoride released from light cured composite resin at low intensity. Which means that the intensity of light cure will affecting the amount of the fluoride release from light cured composite resin materials.

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Article
The effect of various pre-cured temperature of different resin materials on the degree of conversion and microhardness of cured composite resin

Author: Manal A. Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 29 Pages: 279-287
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aims of this in vitro study were to evaluate the effect of different temperatures of the pre- cured composite resin materials on the degree of conversion and knoop microhardness of cured composite resin. Materials and Methods : A forty five disc-shaped specimens were prepared from ( Ceram X, shade D2, Dentsply/ Caulk, USA) after stored for 24h in different temperatures ( 5,25,and 37°C) were light cured for 40s. The FTIR test was used to measure the degree of conversion for each specimen. The knoop microhardness was measured by the use of (WOLPERT-WERKE-GMBH Baujahr Testor, GERMANY) (Vickers hardness test) for each specimen. Data obtained was analyzed using one-way analysis of variance (ANOVA) and Duncan's test at a 0.05 significance level.Results : The statistical analysis of the results (ANOVA) showed that there was statistically significant difference in the degree of conversion and in the microhardness of the prepared samples at the different temperature. As the temperature of the composite resin increase, there was an increase in the degree of conversion and increase in the micro hardness of the samples.Conclusions : The use of pre-warmed composite resin may help to improve the degree of conversion and the micro hardness of composite resin especially at the deeper areas of a restoration which could result in an increase in the expected life of a composite restoration.


Article
The Effect of Curing Time on Fluoride Release from Composite Resin Material

Authors: Amer A. Taqa --- Manal A. Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2008 Volume: 8 Issue: 16 Pages: 255-258
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: This study aims to measure the amount of fluoride release in deionized water from two composite resins materials (Kerr and Tetric ceram)over period of one month. By using different curing time forcuring the composite.Materials and Methods : Two types of composite resin materials were used. They are Tetric ceram and Kerr composite resins divided into five groups for each type of materialsused, each group contain ten sample materials and cured with different time of curing which are(20,30,40,50,60) seconds.The samples measured fluoride release after storing in 5ml of deionized waterthen incubated incubator at 37°C for 24 hours.Results: The amount of fluoride release was affected by the period of curing time. The materials which cured at (20,30,40) seconds gave high amount of fluoriderelease while the materials which cured at (50,60)seconds gave low amount of fluoride release. Conclusions: The amount of fluoride release from composite resins materials were affected by curing time. There is an increase in the amount of fluoride release by decreasing the period of curing time and decreasing by increasing the period of curing time.


Article
The Effect of Two Endodontic Rotary Systems in Root Canal Preparation on Apical Microleakage

Authors: Sabah A Ismail --- Nawfal A Zakaria --- Manal A Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 37-43
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: the aim of this in vitro study was to evaluate the apical sealing ability where the canals are pre-paid by two rotary NiTi systems . Materials and Methods: Thirty-six extracted human teeth with sin-gle root cut there crowns at the cemento-enamel junction CEG. The working length was determined for each tooth. The teeth were divided in to (3)groups ten of each . Group I the teeth were instrumented with ProTaper NiTi then the teeth obturated with matched-taper single cone. Group II of teeth were instrumented with RaCe NiTi rotary instrument and then obturated with matched-taper single cone. Group III were instrumented by hand instruments K-files and obturated by the lateral condensation techniques. Six teeth were divided as positive and negative control group three for each one . Tgadeseal was used as root canal sealer in this study. Adye penetration method was used to evaluate the apical seal using steromicroscope at 40X magnification. One-way analysis of variance and Duncan's test were used for statistical analysis. Results: The statistical analysis of the results demonstrated that there was no statistically significant difference in Microleakge between the two different rotary instrument each ProTaper and RaCe. While there was significant difference between the rotary instrument and the Hand instrument K-files. Conclusions: The use of the NiTi rotary instrument for root canal preparation showed the least apical microleakage, in compaired with hand instrument


Article
Changing in Working Length and Canal Dimension Following Instrumentation with Hand and Rotary Instrument

Authors: Ma,an M.Nayif --- Manal A.Sultan --- Amer A.Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 31 Pages: 431-437
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This study evaluated changes in working length (WL) and root canal dimension after instrumentation with hand instruments (St.St, NiTi) and rotary systems (RaCe, ProTaper). Materials and Methods: Twenty four resin blocks with a curve canal of 33°angle at (14mm) were selected for this study. Working length was measured by a digital measurement using a number (10k) file under stereomicroscope at 40X. The specific sequence of instrumentation was system according to manufacturer’s recommendation. The working length of the canal was measured again between each file and at the end of instrumentation. Pre and post-instrumentation microscopic photographs were taken and measurements of the root canal dimension change were measured with an image analysis programme . The difference in working length was analyzed using ANOVA and Duncan’s test at 5% level of significance. Result: Statistical analysis showed that there was no significance difference in the changing of the working lengths and canal dimension between the two rotary systems (ProTaper,RaCe). While there was a significant difference in the changing of the canal length and dimension between the two rotary systems (ProTaper,RaCe) and the hand instruments (St.St, NiTi). The amount of variation in working length and canal dimension obtained with both types of rotary instruments, was significantly less than that produced by hand instruments. Conclusion: The variation in working length were clinically not very significant between the two rotary NiTi instruments (ProTaper, RaCe)while it was significant with the hand instrument (St.St and NiTi).

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