Comparative radiopacity of four low-viscosity composites (original) (raw)
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Comparative Radiopacity of Six Flowable Resin Composites
Operative Dentistry, 2010
Objective: This study investigated the radiopacity of six commercially available flowable composites by using a digital image analysis method to determine the mean gray values of the materials. Methods: The flowable resin composites evaluated in this study were Clearfil Majesty Flow, Estelite Flow Q, Tetric N Flow, Esthet X Flow, Filtek Supreme XT Flow and Gradia Direct LoFlo. Ten sample discs (6 x 1 mm) for each group were prepared and 1-mm thick slices were obtained from freshly-extracted teeth for the control group. The mean gray values (MGVs) of each specimen and aluminum (Al) stepwedge were measured by using the histogram function of a computer graphics program. Analysis of variance (ANOVA) was used to investigate the significance of the differences among the groups. For pairwise comparisons, the Tukey test was applied (α α=0.05). Results: The radiopacity values of Gradia Direct LoFlo, dentin and Estelite Flow Q were close to that of 1 mm Al. Tetric N Flow and Cl Majesty Flow were more radiopaque than enamel, whereas Filtek Supreme XT Flow had a similar radiopacity to enamel. Conclusion: The radiopacity of flowable composites varies considerably, and care must be taken when selecting an appropriate material to enable secondary caries detection under posterior composite restorations.
Radiopacity of dental restorative materials
Clinical Oral Investigations, 2013
Objectives Radiopacity of dental materials enables clinician to radiographically diagnose secondary caries and marginal defects which are usually located on the proximal gingival margin. The aim of this study was to measure the radiopacity of 33 conventional resin composites, 16 flowable resin composites, and 7 glass ionomer cements and to compare the results with the radiopacity values declared by the manufacturers. Materials and methods From each restorative material, six 2-mm-thick disk-shaped specimens were fabricated and eight 2-mm-thick sections of teeth were made and used as reference. The material samples and tooth sections were digitally radiographed together with the aluminum stepwedge. Gray values were obtained from the radiographic images and radiopacity values were calculated and statistically analyzed. Post hoc Tukey's honestly significant difference test was used to calculate significant differences in radiopacity values between materials and reference dentin and enamel values.
Radiopacity of 28 Composite Resins for Teeth Restorations
The Journal of Contemporary Dental Practice, 2016
ABSTRACTAimRadiopacity is a fundamental requisite to check marginal adaptation of restorations. Our objective was to assess the radiopacity of 28 brands of light-cured composite resins and compare their radiopacity with that of enamel, dentin, and aluminum of equivalent thickness.Materials and methodsComposite resin disks (0.2, 0.5, and 1 mm) were radiographed by the digital method, together with an aluminum penetrometer and a human tooth equivalent tooth section. The degree of radiopacity of each image was quantified using digital image processing. Wilcoxon nonparametric test was used for comparison of the mean thickness of each material.ResultsAll of the materials tested had an equal or greater radiopacity than that of aluminum of equivalent thickness. Similar results for enamel were found with the exception of Durafill, which was less radiopaque than enamel (p < 0.05). All the specimens were more radiopaque than dentin, except for P90 (which was equally radiopaque) and Durafil...
Radiopacity is an important property of composite materials for clinical diagnosis. For seven direct composites (Aelite LS Posterior, Aelite All-Purpose Body, Quadrant Universal LC, Clearfil Majesty Posterior, Clearfil Majesty Esthetic, Filtek Ultimate Dentin, IPS Empress Direct Dentin) and six indirect composites (Ceromega, Epricord, Estenia C&B, Tescera, Signum Ceramis, Solidex), diskshaped specimens (N=260, n=10 per group) were fabricated for two thicknesses at 1 and 2 mm. Average radiographic density of each composite material was calculated. Radiopacity values of specimens were expressed in equivalent thickness of aluminum using the calibration curve. Data were analyzed using one-way and two-way ANOVA, followed by Tukey's HSD test (α=0.05). Radiopacity was significantly affected by resin composite type (p<0.05) and thickness (p<0.001). All composites, except Epricord (1.22-1.84), had higher radiopacity values than dentin (1.23-2.24). IPS Empress Direct (5.58-9.38) and Estenia C&B (5.49-9.16) showed significantly higher radiopacity (p<0.05) than the other materials including enamel and dentin.
Evaluation of the Radiopacity of a Mta-Based Root-Canal Filling Material Using Digital Radiography
Journal of Marmara University Institute of Health Sciences, 2013
MTA-esaslı bir kök-kanal dolgu materyalinin radyo-opasitesinin dijital radyografi kullanılarak değerlendirilmesi Amaç: Bu çalışmanın amacı son zamanlarda kullanıma giren mineral trioksit agregat (MTA) esaslı bir kök-kanal dolgu materyali olan MTA Fillapex'in radyo-opasitesinin dört farklı kök-kanal dolgu materyali ile dijital görüntüleme yöntemi kullanılarak karşılaştırılmasıdır. Yöntemler: Çalışmada kök-kanal dolgu maddesi olarak MTA Fillapex, Adseal, AH Plus, Endomethasone ve güta-perka kon kullanılmıştır. Her bir kök-kanal dolgu materyalinden hazırlanan disk şeklindeki standart numuneler ve alüminyum penetrometre fosfor plaka (size 4; 5.7x7.6 cm) üzerine konarak 70 kVp, 8 mA ve 0.2 sn ışınlama parametreleri ile dijital radyografileri elde edilmiştir. Obje-ışın mesafesi 30 cm olacak şekilde ayarlanmıştır. Test edilen materyallerin grilik değerleri sistemin kendi yazılımı ile dijital olarak ölçülmüş ve eşdeğer alüminyum kalınlığını bulmak amacıyla penetrometre ile karşılaştırılmıştır. Elde edilen bulgular istatistiksel olarak, anlamlılık p<0.05 düzeyinde değerlendirilmiştir. Bulgular: Test edilen materyallerin radyo-opasite değerlerinin milimetre cinsinden alüminyum eşdeğerleri büyükten küçüğe doğru AH Plus (9.70), güta-perka (6.82), MTA Fillapex (5.30), Adseal (3.71) ve Endomethasone (3.67) şeklindedir. Kullanılan kanal dolgu materyallerinin ortalama radyografik dansite değerleri arasında istatistiksel olarak anlamlı farklılık tespit edilmiş (p<0.005) olup en yüksek radyografik dansite değerine sahip olan kanal dolgu materyali AH Plus olmuştur. Sonuç: MTA Fillapex çalışmada test edilen kök-kanal dolgu materyalleri arasında radyo-opasite açısından üçüncü sıradadır. Çalışmada kullanılan tüm materyallerin radyo-opasite değerleri Uluslararası Standartlar Örgütü ve Amerikan Ulusal Standartlar Enstitüsü/ Amerikan Dişhekimleri Birliği tarafından tavsiye edilen minimum standart değerlerini karşılamıştır. Anahtar sözcükler: Alüminyum penetrometre, dijital radyografi, radyo-opasite, kök-kanal dolgu materyali ABS TRACT Evaluation of the radiopacity of a MTA-based rootcanal filling material using digital radiography Objective: The aim of this study was to assess the radiopacity of a relatively new mineral trioxide aggregate (MTA)-based root-canal filling material and to compare it with four currently used root-canal filling materials using a digital imaging system. Methods: The root-canal filling materials tested were MTA Fillapex, Adseal, AH Plus, Endomethasone and gutta-percha cones. Standard disks of five different root-canal filling materials were exposed together with an aluminum stepwedge calibrated in millimeters. For the radiographic exposures, a storage phosphor plate (size 4; 5.7x7.6 cm) and an x-ray machine at 70 kVp and 8 mA were used. The object-tofocus distance was 30 cm, and the exposure time was 0.2 sec. The grey values of the test materials were measured digitally using the system's own software and compared with the stepwedge to find the equivalent thickness of aluminum. The data were analyzed statistically with significance levels set at p<0.05. Results: The radiopacity values of the studied materials in decreasing order, expressed in millimeters of aluminum equivalent, were: AH Plus (9.70), gutta-percha (6.82), MTA Fillapex (5.30), Adseal (3.71) and Endomethasone (3.67). Statistically significant differences were found between mean radiographic density values of the tested materials (p<0.005), AH Plus showing the highest value. Conclusion: MTA Fillapex was the third most radiopaque rootcanal filling material among the tested materials in the study. All of the materials evaluated met the minimum radiopacity standard recommended by International Organization for Standardization and the American National Standards Institute/American Dental Association.
Study of the radio-opacity of base and liner dental materials using a digital radiography system
Dentomaxillofacial Radiology, 2013
Objectives: This study investigated the radio-opacity of commercially available glass ionomer cements (GICs), flowable resin composites (FRCs) and calcium hydroxide cements (CHCs) and compared this with the radio-opacity of enamel, dentine and aluminium stepwedge. 16 GICs, 8 FRCs and 4 CHCs were analysed. Methods: Three sets of three samples were prepared: 1 mm, 2 mm and 3 mm thickness for GIC and FRC and 1 mm thickness for CHC. Specimens of enamel and dentine with the same thicknesses were obtained. As a control, an aluminium stepwedge was used. Radiographs were taken with a digital Kodak RVG 5000 (0.32 s, 30 cm). The images were analysed using the Image Tool ® program (v. 2.
An investigation of the radiopacity of composite restorative materials
Australian Dental Journal, 1981
The radiopacity of 33 commercially available composite materials was measured in terms of their equivalent thickness of an aluminium alloy per unit thickness of material. The theoretical significance of this definition was discussed. The radiopacities were found to vary by more than an order of magnitude. Although nearly 30 percent of the materials have radiopacities less than dentine, all materials claimed to be radiopaque were more so than dentine. The influence of operating potential, specimen thickness, X-ray generator type, film type, filtration and X-ray dose were investigated. The former two factors were found to have a large influence on the radiopacity. aluminium : and colleagues at the Australian Dental Standards Laboratory for their assistance in this study.