Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

Rizzante, Fábio Antônio Piola; Duque, Jussaro Alves; Duarte, Marco Antônio Húngaro; Mondelli, R.; Mendonça, Gustavo; Ishikiriama, Sérgio Kiyoshi

doi:10.4012/dmj.2018-063

Cited by 86 publications

(63 citation statements)

References 42 publications

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“…Furthermore, the bevel removes the enamel aprismatic layer, which regularizes the enamel superficial layer, removing fragile prisms and improving the adhesion (Coelho- De-Souza et al, 2012;Van Meerbeek et al, 2011;Wang et al, 2018). The removal of weakened prisms is fundamental because they can fracture during the insertion/condensation of restorative material, masticatory function, as well as due to polymerization shrinkage/stress generated during cure of resin composites (Coelho-De-Souza et al, 2012;Rizzante et al, 2018;Rizzante et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

Meurer¹,

Rizzante

Maenossono

et al. 2019

Microscopy Res & Technique

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The quality of the micromechanical retention between the enamel prisms exposed through acid etching and adhesive system can be influenced by the relationship between the angle of the exposed enamel prisms and the external surface/restorative material. Therefore, the aim of the present study was to determine the influence of the enamel cavosurface beveling in different cavity sizes on the angle relation between enamel prisms and the restorative material. For this research, 30 human permanent molars were used and divided into three groups according the isthmus aperture of class I cavities (1/4, 1/3, and 1/2 of the intercuspal distance). Cavosurface angle beveling was performed in each tooth buccal or palatal/lingual side, and a resin composite restoration was placed. Each restored tooth was sectioned in buccal/palatal direction followed by analysis in scanning electron microscope. Means of the angles observed between enamel prisms and the restorative material were registered and statistically analyzed by Kruskal‐Wallis test. Results showed higher mean angle values for beveled groups when comparing with the values observed in the unbeveled margins (p < .05) regardless of the isthmus aperture, being 1/4 (beveled = 48.36°; unbeveled = 20.71°), 1/3 (beveled = 39.75°; unbeveled = 29.15°), and 1/2 (beveled = 37.02°; unbeveled = 26.34°). It was also observed that in some unbeveled cavities, there were the presence of laterally exposed enamel prisms (0°), mainly in more conservative cavities. It was concluded that the presence of higher angles values occurred in the samples with beveled margins, without presence of laterally exposed enamel prisms.

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Section: Discussionmentioning

confidence: 99%

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

Meurer¹,

Rizzante

Maenossono

et al. 2019

Microscopy Res & Technique

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“…Curing depth and DC of BF are measured using several methods such as Micro-hardness, Fourier Transform Infrared Spectroscopy (FTIR) and Raman Spectroscopy. Some studies have found that DC of BF is sufficient in 4 mm thickness [2,[8][9][10], But some investigations reported that all BF RBCs were not sufficiently cured in the 4-mm bulk [11,12].…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

Effect of storage time and composite thickness on Degree of Conversion of Bulk-fill and universal composites using FTIR method

Farahat

Davari

Fadakarfard

2020

BDS

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Objective: Degree of Conversion (DC) of Resin-Based composites (RBCs) is a concern and is affected by different factors. This study was conducted to evaluate the effect of different thicknesses and storage times on DC of bulk-fill and universal RBCs using the FTIR method. Material and methods: For each of dental composite (Tetric N- Ceram Bulk Fill and Tetric N Ceram), 28 samples were prepared (14 samples with 2 mm height and 14 samples with 4 mm height). One and seven days (1d and 7d) after storage in an incubator at 37 ˚C, DC was measured and recorded using a FTIR device. Data were analyzed using t-test and Three-Way ANOVA and Tukey Post-Hoc Test. P < 0.05 was considered statistically significant. Results: DC of Bulk-fill composite is greater than universal composite. DC at 2 mm thickness is more than 4 mm. Unlike universal composite, 7d DC of Bulk-fill composite is greater than 1d. Of course, none of these differences are statistically significant (P-value > 0.05). Conclusions: Considering the limitation of this study, since no difference was found between DC of 1d and 7d, 1d DC is sufficient for clinical procedures, such as polishing, and the laboratory tests.KEYWORDSBulk-fill composites; Degree of Conversion; FTIR.

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“…Resin composites as direct restorative materials are widely used in dentistry due to their esthetics and adhesion to tooth structure. However, this material still show drawbacks related to polymerization shrinkage and stress induced within the material, at the tooth/restoration interface, and in the tooth structure (Krejci et al, 2005;Yamamoto et al, 2009;Ferracane and Hilton, 2016), which may influence the clinical performance of restorations (Braga et al, 2005;Ferracane and Hilton, 2016;Rizzante et al, 2019). The compromised adhesion along the restoration margin or at restoration/tooth interface, resulting in gap, stains, microleakage or cuspal movement has been considered a consequence of polymerization shrinkage (Krejci et al, 2005;Yamamoto et al, 2009;Bicalho et al, 2014;Kim and Park, 2014;Kim et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The polymerization shrinkage is an inherent characteristic of the resin composites (Braga et al, 2005;Rizzante et al, 2019), which depends on a number of factors including the material composition, the degree of conversion, the volume, and the elastic modulus (Braga et al, 2005;Braga et al, 2012;Benetti et al, 2014;Kim and Park, 2014;Van Dijken and Lindberg, 2015;Ferracane and Hilton, 2016;Han et al, 2019). The fact is that stress cannot be considered an isolated factor when it comes to the marginal adaptation of resin composite restorations; other factors, such as thermal changes and occlusal loads (Kim and Park, 2014;Van Dijken and Lindberg, 2015), placement of resin composite (Furness et al, 2014;Yoshimine et al, 2015;Correia et al, 2018;Alqudaihi et al, 2019), curing technique (dos Santos et al, 2007;Gamarra et al, 2018), cavity size and geometry (Braga et al, 2006;Borges et al, 2014;Han et al, 2016;Han et al, 2019) also may have a significant effect.…”

Section: Introductionmentioning

confidence: 99%

Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

Correia

Pereira

Bresciani

et al. 2019

Journal of the Mechanical Behavior of Biomedical Materials

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The study aimed to evaluate the influence of cavosurface angle on stress concentration and gap formation in class V restorations. Cylindrical cavities 3 mm in diameter were prepared in forty-five bovine incisors, changing only the angle of the bur in relation to the flat surface of the tooth. The cavities maintained the same volume (17.67 mm³). The samples were divided according to the cavosurface angle, into three groups (n=15): 90º, 120º, 135º. After adhesive application (Futurabond U, VOCO), the cavity was filled with bulk placement of a resin composite (GrandioSO, VOCO). The teeth were analyzed with stereomicroscopy. Data of marginal gap formation were statistically analyzed with a oneway analysis of variance (ANOVA) followed by Tukey tests (significance level: α=0.05).Finite element analysis (FEA) was used to study residual stress in these geometries and to correlate those stresses with experimentally measured gap formation. The elastic modulus and polymerization shrinkage were determined for FEA. Residual shrinkage stresses were expressed in maximum principal stress (MPS). There was a significant difference in the gap formation among the groups (p=0.001). A significantly lower marginal gap formation was found for 120° and 135° angles, with no significant difference between them. The cavosurface angle at 90º caused substantially higher stresses, in the restoration interface, with greater marginal gap. For the 120° and 135° angles, the stress concentrations were smaller and were located in the dental structure.The cavosurface angle influenced the marginal gap formation and stress concentration.

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Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

Cited by 86 publications

References 42 publications

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

Effect of storage time and composite thickness on Degree of Conversion of Bulk-fill and universal composites using FTIR method

Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

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