Micro‐computed tomography evaluation of internal void formation of bulk‐fill resin composites in Class II restorations

2018 ◽  
Vol 40 (8) ◽  
pp. 2984-2992 ◽  
Author(s):  
Gülbike Demirel ◽  
İsmail Hakkı Baltacıoğlu ◽  
Mehmet Eray Kolsuz ◽  
Mert Ocak ◽  
Kaan Orhan
Keyword(s):  
Computed Tomography ◽  
Void Formation ◽  
Class Ii ◽  
Resin Composites ◽  
Micro Computed Tomography

Effect of Sonic Resin Composite Delivery on Void Formation Assessed by Micro-computed Tomography

2018 ◽  
Vol 43 (2) ◽  
pp. 144-150 ◽  
Author(s):  
R Hirata ◽  
RR Pacheco ◽  
E Caceres ◽  
MN Janal ◽  
MF Romero ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Light Emitting Diode ◽  
Resin Composite ◽  
Three Dimensional ◽  
Void Formation ◽  
Calculated Data ◽  
Void Volume ◽  
Resin Composites ◽  
Micro Computed Tomography ◽  
Insertion Method

SUMMARY Objectives: The aim of this study was to quantify the internal void volume formation in commercially available, resin composites inserted using conventional or sonic insertion methods, and analyzed using three-dimensional (3D) micro-computed tomography (μCT). Methods and Materials: Four resin composites were evaluated: one conventional (Herculite, Ultra, Kerr Corporation, Orange, CA, USA), one flowable bulk fill (SureFil SDR Flow, Dentsply International, York, PA, USA), and two packable bulk fill (SonicFill, Kerr Corporation, and Tetric EvoCeram Bulk Fill, Ivoclar Vivadent Inc, Schaan, Liechtenstein). Eight groups were evaluated according to each resin composite type and insertion method (conventional or sonic; n=5). Forty ABS 3D-printed cylindrical molds, 5.0 mm in diameter and 4.0 mm in depth, were fabricated. For the conventional resin composite, the mold was filled incrementally (two layers), while for bulk-fill resin composites, insertion was performed in a single increment. The sonic insertion method was performed using a specific handpiece (SonicFill Handpiece, Kerr Corporation). Resin composites were light cured using a multipeak light-emitting diode light-curing unit (VALO, Ultradent Products Inc, South Jordan, UT, USA) in its regular mode. Samples were evaluated by μCT, and data were imported into software (Amira, version 5.5.2, VSG, Burlington, MA, USA) for 3D reconstruction, from which the percentage of void volume was calculated. Data were analyzed using two-way analysis of variance and Tukey post hoc test at a preset alpha of 0.05. Results: The conventional insertion method resulted in reduced porosity, compared with sonic insertion, for SureFil SDR Flow and Tetric EvoCeram bulk fill. The sonic insertion method did not demonstrate any influence on void formation for Herculite Ultra or SonicFill. Conclusion: Results suggest that the sonic insertion method might increase void formation during resin composite delivery, depending on restorative material brand.

scholarly journals Micro-computed tomography analysis of gap and void formation in different prefabricated fiber post cementation materials and techniques

2019 ◽  
Vol 31 (2) ◽  
pp. 236-241
Author(s):  
Aws ArRejaie ◽  
Saleh A. Alsuliman ◽  
Mohammed O. Aljohani ◽  
Hesham A. Altamimi ◽  
Emad Alshwaimi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Void Formation ◽  
Micro Computed Tomography ◽  
Fiber Post ◽  
Tomography Analysis

scholarly journals Evaluation of Interfacial Gap Volume of Two Low-shrinkage Composites Using Micro–Computed Tomography

2017 ◽  
Vol 42 (6) ◽  
pp. 658-668 ◽  
Author(s):  
HNA Al Nahedh ◽  
NS Sibai
Keyword(s):  
Computed Tomography ◽  
Adhesive Layer ◽  
Class Ii ◽  
Class I ◽  
Micro Computed Tomography ◽  
Volume Percentage ◽  
Significant Difference ◽  
The Mean ◽  
Interfacial Gap ◽  
Factor C

ABSTRACT Objectives: To investigate the efficacy of X-ray micro–computed tomography (μCT) in the detection and quantification of interfacial gap formation in standardized Class I and Class II resin composite restorations, to compare the interfacial gaps for two low-shrinkage resin composites with a methacrylate composite material, and to determine any correlation between the cavity configuration factor (C-factor) and the volume of gaps formed. Methods and Materials: Sixty standardized Class I and Class II cavities were prepared and divided into six groups. Three types of composites, with their recommended self-etching adhesive systems, were used: Filtek Z250 XT; Estelite Sigma Quick; and Filtek P90. Each of the composite materials was placed in 10 Class I and 10 Class II cavities. The specimens were digitized using Skyscan 1172 μCT. They were examined for gap volume measurements, the thickness of the adhesive layer, and location of interfacial gaps. Results: There was a significant difference in the mean gap volume percentages of the three materials. The gap volume percent of Estelite Sigma quick was significantly lower than that of Filtek P90. No significant difference in the mean gap volume percentages of Class I and Class II restorations was found, except for Estelite Sigma Quick, in which the Class I gap volume percentage was higher than that of the Class II restorations. Conclusions: μCT is an efficacious tool for the measurement of volumetric gaps formed at the tooth/restoration interface and for the evaluation of the adhesive layer. The differences in the C-factor do not always have a pronounced effect on the gap volumes of low-shrinkage composites.

scholarly journals A micro-computed tomography evaluation of the change in volume of different bulk-fill composite materials caused by polymerization shrinkage

2021 ◽  
Vol 11 (2) ◽  
pp. 75-82
Author(s):  
Suzan Cangül ◽  
Özkan Adıgüzel ◽  
Savaş Sağmak ◽  
Begüm Evran
Keyword(s):  
Computed Tomography ◽  
Composite Materials ◽  
Class Ii ◽  
Ct Images ◽  
Composite Resins ◽  
Micro Ct ◽  
Micro Computed Tomography ◽  
Dental Tissue ◽  
Polymerization Shrinkage ◽  
Native Speakers Of English

Aim: Composite resins contain different monomers and fillers that are directly affected by polymerization shrinkage.  Therefore, an accurate and reliable method is needed to measure the volume changes. The aim of this study was to evaluate the amount of volume change associated with polymerization shrinkage in four different bulk-fill composite materials in class II restorations using a micro-CT device, which has high resolution and provides 3-dimensional images. Methodology: A total of 40 human 3rd molar teeth were used. First, standard class II cavities were opened on the mesial surfaces of all the teeth, and then the first micro-CT images were obtained. The same adhesive material was applied to all the teeth. The teeth were then separated into four groups, and a different bulk-fill composite was applied to each group; Filtek (FTK), X-tra Fil (XTF), Tetric Evo Ceram (TEC), and Filtek One (FLO) and the second micro-CT images were obtained. Then after polymerization of the materials, the final micro-CT images were taken, and analyses were made according to the scanning results. The Kruskal Wallis and Mann Whitney U-tests were used in the statistical evaluation of the data.  Results: The volumetric gap formed after polymerization of the composite resins was not determined to be statistically significant (p>0.05). Conclusion: The volumetric difference (%) between the composite resin and the dental tissue following polymerization was seen to be greatest in XTF and least in FTK. It was concluded that the volumetric gap caused by the polymerization shrinkage of the tested materials may be due to the structure of the material.   How to cite this article: Cangül S, Adıgüzel Ö, Sağmak S, Evran B. A micro-computed tomography evaluation of the change in volume of different bulk-fill composite materials caused by polymerization shrinkage. Int Dent Res 2021;11(2):75-82. https://doi.org/10.5577/intdentres.2021.vol11.no2.4   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.  

scholarly journals Do dual-cure bulk-fill resin composites reduce gaps and improve depth of cure

2021 ◽  
Vol 32 (5) ◽  
pp. 77-86
Author(s):  
May Anny Alves Fraga ◽  
Lourenço Correr-Sobrinho ◽  
Mário Alexandre Coelho Sinhoreti ◽  
Talita Malini Carletti ◽  
Américo Bortolazzo Correr
Keyword(s):  
Computed Tomography ◽  
In Vitro Study ◽  
Resin Composites ◽  
Third Molars ◽  
Micro Computed Tomography ◽  
Depth Of Cure ◽  
Microhardness Data ◽  
Knoop Microhardness ◽  
Made In

Abstract This in vitro study aimed to evaluate the gaps length and depth of cure of dual-cure bulk-fill resin composites inserted in box-shaped preparations. Box-shaped preparations (4 mm deep) were made in fifteen human third-molars and divided into three groups according to the resin composites (n=5): Dual-cure bulk-fill BulkEZ (BEZ); Dual-cure bulk-fill HyperFIL (HF); and Tetric Evoceram Bulk-fill (TETRIC), as control. Gaps length (%) was evaluated in tooth-restoration interface with micro-computed tomography (µCT). The restorations were sectioned, and the degree of conversion (DC) and Knoop microhardness were evaluated at five depths (0.3, 1, 2, 3, and 4 mm). Microhardness data were statistically evaluated using absolute values (KHN) and relative values (microhardness percentages in relation to top). Gaps length (%) increased in the following order: BEZ=TETRIC<HF. The microhardness percentages in relation to top significantly decreased from 2 mm for TETRIC and 3 mm for HF. BEZ had constant microhardness and DC at all depths, while HF and TETRIC presented a significant decrease on DC at 4 mm. Dual-cure bulk-fill composites did not reduce gaps compared to light-cure bulk-fill, but they can improve depth of cure of bulk-filled restorations.

Cortical and trabecular bone parameters from HR-Pqct images at the Tibia: a local comparison with synchrotron radiation micro-computed tomography

2013 ◽  
Author(s):  
Agnes Ostertag ◽  
Francoise Peyrin ◽  
Sylvie Fernandez ◽  
Jean-Denis Laredo ◽  
Vernejoul Marie-Christine De ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Synchrotron Radiation ◽  
Trabecular Bone ◽  
Micro Computed Tomography ◽  
Bone Parameters ◽  
Local Comparison

Morphology and Affinities of Ampelocissites Seeds (Vitaceae: Ampelopsis clade) from the Paleogene of Texas, USA

2020 ◽  
Vol 45 (3) ◽  
pp. 478-482
Author(s):  
Steven R. Manchester
Keyword(s):  
Computed Tomography ◽  
Cross Sections ◽  
Seed Coat ◽  
Ct Scanning ◽  
Seed Morphology ◽  
Early Eocene ◽  
Micro Computed Tomography ◽  
X Ray ◽  
Fossil Seeds ◽  
Fossil Genus

Abstract—The type material on which the fossil genus name Ampelocissites was established in 1929 has been reexamined with the aid of X-ray micro-computed tomography (μ-CT) scanning and compared with seeds of extant taxa to assess the relationships of these fossils within the grape family, Vitaceae. The specimens were collected from a sandstone of late Paleocene or early Eocene age. Although originally inferred by Berry to be intermediate in morphology between Ampelocissus and Vitis, the newly revealed details of seed morphology indicate that these seeds represent instead the Ampelopsis clade. Digital cross sections show that the seed coat maintains its thickness over the external surfaces, but diminishes quickly in the ventral infolds. This feature, along with the elliptical chalaza and lack of an apical groove, indicate that Ampelocissites lytlensis Berry probably represents Ampelopsis or Nekemias (rather than Ampelocissus or Vitis) and that the generic name Ampelocissites may be useful for fossil seeds with morphology consistent with the Ampelopsis clade that lack sufficient characters to specify placement within one of these extant genera.

INVESTIGATION OF AUBRITES THROUGH INTEGRATION OF 3D MODAL MINERALOGY WITH X-RAY MICRO-COMPUTED TOMOGRAPHY AND GEOCHEMISTRY

2018 ◽  
Author(s):  
Zoë E. Wilbur ◽  
◽  
Arya Udry ◽  
Arya Udry ◽  
Daniel M. Coleff ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Micro Computed Tomography ◽  
X Ray
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