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Assessing The Radiopacity of Three Resin Composite Materials Using a Digital Radiography Technique

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Abstract

Background: Radiopacity is one of the prerequisites for dental materials, especially for composite restorations. It's essential for easy detection of secondary dental caries as well as observation of the radiographic interface between the materials and tooth structure. The aim of this study to assess the difference in radiopacity of different resin composites using a digital x-ray system.Materials and methods: Ten specimens (6mm diameter and 1mm thickness) of three types of composite resins (Evetric, Estelite Sigma Quick,and G-aenial) were fabricated using Teflon mold. The radiopacity was assessed using dental radiography equipment in combination with a phosphor plate digital system and a grey scale value aluminum step wedge with thickness varying from 1mm to 10mm in steps of 1mm each. The tested materials were radiographed, we used Image J software, on a computer screen to evaluate the degree of radiopacity for each individual material and compare with the aluminum step wedge. Radiopacity was expressed in mm of equivalent aluminum step wedge. Analysis of varience (ANOVA) and Least Significant Difference (LSD) were used to investigate the significance of differences among the tested groups.Results: Statistical analysis showed highly significant difference among the tested groups (p≤0.01). Amongst, G-aenial composite shows the most radiopaque and it is above or equivalent to that of enamel, while Estelite Sigma Quick composite has the lowest radiopacity value and is equivalent to that of dentin.Conclusion: In line with previous studies, and within the limitation of our study, considerable variations in radiopacity values were found among materials depending on the radiopaque elements incorporated into the matrix. All composite materials tested complied with the ISO 4049 standard


Article
Radiopacity of modified microhybrid composite resin: (An in vitro study)

Authors: Sazan Sh. Saleem سازان سليم --- Salem A. Al-Samarai سالم السامرائي --- Dara H. Saeed دارا سعيد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: special issue 1 Pages: 18-22
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this study was to measure the radiopacity (RO) of modified microhybrid composite resins byadding 2 types of nanofillers (Zinc Oxide and Calcium Carbonate) in two concentrations 3% and 5% and comparingthem to unmodified microhybrid composite resins and to nanofilled composite resin.Materials and Methods: Two types of composite resin were used (Microhybrid composite MH Quadrent anterior shineand Nanofilled composite resin Filtek Z350 XT), for each tested group five disk-shaped specimens (1-mm-thick and 15mm diameter) were fabricated. The material samples were radiographed together with the aluminum step wedge.The density of the specimens was determined with a transmission densitometer and was expressed in term ofequivalent thickness of aluminum. Data analyzed by one-way ANOVA.Results: The radiopacity (RO) values of the tested group ranged between (0.9293- 2.6242 Eq. Al thickness) and therewere significant differences among them. Nanofilled composite resin Filtek Z350 XT showed the highest value of ROwhile unmodified Microhybrid composite MH Quadrent anterior shine showed the lowest value of RO.Conclusion: The addition of 3% of both the ZnO and CaCO3 nanofillers fillers to microhybrid composite significantlyincreased the RO, while the addition of 5% of CaCO3 and ZnO nanofillers to microhybrid composite showed nonsignificantincrease in the RO of the composite.


Article
Assessing the radiopacity of new root end filling materials using digital radiography technique

Author: Dr. Raghad A. Al-Hashimi, BDS, MSc, PhD د. رغد عبد الرزاق الهاشمي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2015 Volume: 12 Issue: 1 Pages: 10-15
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: Radiographic discrimination of root end filling materials fromsurrounding tooth structure is clinically relevant for assessing the quality ofretrograde treatment. The present study aimed at evaluating the radiopacity ofBiodentine™ and Pro Root MTA as root end filling materials using a digitalradiography technique.Materials and Methods: Specimens of BiodentineTM and Pro Root MTA testmaterials with 1mm thick and 10 mm internal diameter were prepared for digitalradiographic analysis using an aluminum washer. The radiopacity of theBiodentine™ and Pro Root MTA was assessed using dental radiographyequipment in combination with a phosphor plate digital system and a grey scalevalue aluminum step wedge with thicknesses varying from 1 mm to 10 mm insteps of 1 mm each. The degree of radiopacity of the test materials wereradiographed and compared together with the aluminum step wedge on acomputer screen using image J software. Radiopacity was expressed in mm ofequivalent aluminum step wedge. The radiopacity values of Biodentine™ and ProRoot MTA were statistically analyzed using the one way analysis of variance(ANOVA) and post-hoc test (Bonferroni test), the level of significance was set at0.05 (P<0.05). Results: The radiographic data showed that the degree ofradiopacity of Pro root MTA is significantly higher than that of Biodentine™(P<0.001). The current study reported that the ProRoot MTA showed requisiteradiopacity around 5.86 mm when compared with aluminum step wedge steps,whereas the radiopacity of Biodentine™ determined around 2.46 mm ofequivalent aluminum.Conclusion: The radiopacity of Pro Root MTA is clinically relevant that allows forclear distinction between the material and the surrounding tooth structure enablingit to be used as root end filling material. However, Biodentine showed reducedradiopacity that needs further improvement.

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