scholarly journals Improving Composite Resin Performance Through Decreasing its Viscosity by Different Methods

2015 ◽  
Vol 9 (1) ◽  
pp. 235-242 ◽  
Author(s):  
Kusai Baroudi ◽  
Said Mahmoud
Keyword(s):  
Composite Materials ◽  
Composite Resin ◽  
Resin Composite ◽  
Marginal Adaptation ◽  
Monomer Mixture ◽  
Light Cure Unit ◽  
Flowable Composites

The aim of this work was to present the different current methods of decreasing viscosity of resin composite materials such as (using flowable composites, lowering the viscosity of the monomer mixture, heating composites and applying sonic vibration) and furnish dentists with a basis that can provide criteria for choosing one or another to suit their therapeutic requirements. The four discussed methods proved that lowering composite viscosity improves its handling and facilitates its application to cavities with complicated forms, decreasing time for procedure and improving marginal adaptation. Other properties improved by decreasing composite resin viscosity were controversial between the four methods and affected by other factors such as composite brand and light cure unit.

scholarly journals Marginal adaptation in proximal cavities restored with composites and other materials

2017 ◽  
Vol 20 (4) ◽  
pp. 63 ◽  
Author(s):  
Raphaela Farias Rodrigues ◽  
Suellen Scarcelli Senna ◽  
Ana Flávia Soares ◽  
Rafael Lia Mondelli ◽  
Paulo Silveira Francisconi ◽  
...  
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Composite Resins ◽  
Marginal Adaptation ◽  
Glass Ionomer ◽  
Marginal Gap ◽  
Significant Difference ◽  
Molar Teeth ◽  
Composite Flow

<p><strong>Objective</strong>: To evaluate the marginal adaptation, in enamel (E) and dentin (D), of composite resin (CR) associated with flowable resin composite (flow), bulk fill flowable base (bulk) and resin modified glass ionomer cement (RMGIC) in slot cavities. <strong>Material and Methods</strong>: The study was conducted after approval (Protocol No. 21148413.4.0000.5417) from Ethics Committee. Forty extracted human molar teeth were randomly assigned in eight experimental groups: E-CR, E-BULK, E-FLOW, E-RMGIC, D-CR, D-BULK, D-FLOW, D-RMGIC. The occlusal surface was planned, two slot cavities with standard sizes (depth: 2.0 mm, height: 2.5 mm, width: 2.0 mm) were created on a machine for making cavities. The teeth were restored and after 24h subjected to 2000 cyclic loading and sectioned for analysis of marginal adaptation by scanning electron microscopy (SEM). The micrographs were analyzed with the Image J program to measure the size of marginal gaps. The data were transformed into percentages (%GAPS = LG ÷ LM  × 100) and analyzed by 2-way ANOVA followed by the post hoc Tukey test (α=0.05). <strong>Results</strong>: There was a significant difference between different treatments (<em>p&lt;0.01</em>). The groups E-RMGIC (<em>p=0.001</em>) and D-RMGIC (<em>p=0</em>) had the highest percentage of marginal gap. Others groups showed similar percentage of marginal gap <em>(p&gt;0.05)</em>. <strong>Conclusions</strong>: It was concluded that restorations with flowable composite resin and bulk fill liners exhibit the same behavior, but the RMGIC liner increased marginal gap.</p><p><strong>Keywords: </strong>Composite resins; Dental marginal adaptation; Glass ionomer cements.</p>

scholarly journals In Vitro Assessment of Single-Retainer Tooth-Colored Adhesively Fixed Partial Dentures for Posterior Teeth

2010 ◽  
Vol 2010 ◽  
pp. 1-9
Author(s):  
Tissiana Bortolotto ◽  
Carlo Monaco ◽  
Ioana Onisor ◽  
Ivo Krejci
Keyword(s):  
Fracture Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Marginal Adaptation ◽  
Fiber Reinforced ◽  
Posterior Teeth ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Custom Made ◽  
Feldspathic Porcelain

The purpose of this paper was to investigate, by means of marginal adaptation and fracture strength, three different types of single retainer posterior fixed partial dentures (FPDs) for the replacement of a missing premolar. Two-unit cantilever FPDs were fabricated from composite resin, feldspathic porcelain, and fiber-reinforced composite resin. After luting procedures and margin polishing, all specimens were subjected to a Scanning Electron Microscopic marginal evaluation both prior to and after thermomechanical loading with a custom made chewing simulator comprising both thermal and mechanical loads. The results indicated that the highest score of marginal adaptation, that is, the closest score to 100% of continuous margins, at thetooth-composite resininterface was attained by the feldspathic porcelain group (88.1% median), followed by the fiber-reinforced composite resin group (78.9% median). The worse results were observed in the composite resin group (58.05% median). Fracture strength was higher in feldspathic porcelain (196N median) when compared to resin composite (114.9 N median). All the fixed prostheses made of fiber-reinforced composite resin detached from the abutment teeth before fracturing, suggesting that the adhesive surface's retainer should be increased.

Effect of Light Curing Units on Marginal Adaptation and Hardness of Class II Composite Resin Restorations

2007 ◽  
Vol 8 (7) ◽  
pp. 38-45 ◽  
Author(s):  
Larissa Maria Cavalcante ◽  
Alessandra Resende Peris ◽  
Luiz André Freire Pimenta ◽  
Nick Silikas
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Class Ii ◽  
Marginal Adaptation ◽  
Gap Formation ◽  
Vertical Slot ◽  
Light Curing ◽  
Composite Resin Restorations ◽  
Effect Of Light ◽  
Resin Restorations

Abstract Aims The aim of this study was to test the influence of different curing protocols on dentin marginal adaptation and the hardness of two composites. Methods and Materials Three light-curing-units (LCUs): Quartz-Tungsten-Halogen (QTH: 541mW/cm2), Argon-Ion-Laser (AL: 277mW/cm2), and Plasma-Arc-Curing (PAC: 1818mW/cm2) and two composites FiltekZ250 (F) and Tetric Ceram HB (TC) were tested. Sixty standardized “vertical-slot-Class II-cavities” were prepared at the mesial surface of bovine incisors and divided into six groups (n=10). Composites were placed using the Single Bond adhesive system and cured in 2 mm increments according to the manufacturers’ instructions. After polishing, epoxy replicas were processed for scanning electron microscopy (SEM) marginal adaptation analysis at 500x magnification. The specimens were then sectioned transversally to the dental long axis, embedded in polyester resin, then polished and submitted to the Knoop hardness test at gingival and occlusal portions of the restoration. Data were analyzed using two-way analysis of variance (ANOVA) and Tukey's test (p=0.05). Results The gap margins ranged between 4.3 to 5.8 μm, and no statistically significant differences were revealed in marginal adaptation for LCUs or for composites (p>0.05). Location influenced hardness (p≤0.01). The occlusal portion presented significantly higher KHN than the gingival portion for all composite-LCU combinations. Regardless of the LCU used, TC produced statistically significant lower hardness values (ranging between 82.8 to 110.7 KHN) than F (ranging between 105.9 to 117.3 KHN). Conclusions Hardness and gap formation were not dependent on the LCUs tested in this study. Different resin composite was found to be a significant factor with regards to hardness but not gap formation. Citation Cavalcante LM, Peris AR, Silikas N, Pimenta LAF. Effect of Light Curing Units on Marginal Adaptation and Hardness of Class II Composite Resin Restorations. J Contemp Dent Pract 2007 November; (8)7:038-045.

scholarly journals An update of treatment modalities in children and adolescents with teeth affected by molar incisor hypomineralisation (MIH): a systematic review

2021 ◽  
Author(s):  
C. Somani ◽  
G. D. Taylor ◽  
E. Garot ◽  
P. Rouas ◽  
N. A. Lygidakis ◽  
...  
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Research Question ◽  
Glass Ionomer Cement ◽  
Treatment Modalities ◽  
Cochrane Central Register ◽  
Molar Incisor Hypomineralisation ◽  
Fissure Sealants ◽  
Preformed Metal Crowns ◽  
Incisor Hypomineralisation

Abstract Purpose To systematically review the treatment modalities for molar-incisor hypomineralisation for children under the age of 18 years. The research question was, ‘What are the treatment options for teeth in children affected by molar incisor hypomineralisation?’ Methods An electronic search of the following electronic databases was completed MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, LILACS, Google Scholar and Open Grey identifying studies from 1980 to 2020. The PRISMA guidelines were followed. The studies were screened, data extracted and calibration was completed by two independent reviewers. Results Of 6220 potential articles, 34 studies were included. Twenty studies investigated management of molars with fissure sealants, glass ionomer cement, polyacid modified resin composite, composite resin, amalgam, preformed metal crowns, laboratory-manufactured crowns and extractions. In four articles management of incisors with microabrasion, resin-infiltration and a combination of approaches was reported. Eight studies looked at strategies to mineralise MIH-affected teeth and/or reduce hypersensitivity. Two studies investigated patient-centred outcomes following treatment. Due to the heterogeneity between the studies, meta-analysis was not performed. Conclusion The use of resin-based fissure sealants, preformed metal crowns, direct composite resin restorations and laboratory-made restorations can be recommended for MIH-affected molars. There is insufficient evidence to support specific approaches for the management of affected incisors. Products containing CPP-ACP may be beneficial for MIH-affected teeth.

Mechanical degradation of contemporary CAD/CAM resin composite materials after water ageing

2021 ◽  
Author(s):  
Michael Wendler ◽  
Anja Stenger ◽  
Julian Ripper ◽  
Eva Priewich ◽  
Renan Belli ◽  
...  
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Mechanical Degradation ◽  
Cad Cam

scholarly journals Clinical Evaluation of Flowable Composite Materials in Permanent Molars Small Class I Restorations: 3-Year Double Blind Clinical Study

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4283
Author(s):  
Walter Dukić ◽  
Mia Majić ◽  
Natalija Prica ◽  
Ivan Oreški
Keyword(s):  
Clinical Study ◽  
Composite Materials ◽  
Retention Rate ◽  
Statistical Significance ◽  
United States Public Health ◽  
Class I ◽  
Marginal Adaptation ◽  
Small Class ◽  
Flowable Composite ◽  
Permanent Molars

This study evaluated the 3-year clinical performance of four different flowable composite materials used in Small Class I restorations in permanent molars. This double-blinded, clinical study analyzed 229 Small Class I restorations/103 children at baseline, 12, 24, and 36 months with modified United States Public Health Services (USPHS) criteria. The tested flowable materials were Voco Grandio Flow + Voco Solobond M, Vivadent Tetric EvoFlow + Vivadent Excite, Dentsply X-Flow + Dentsply Prime&Bond NT, and 3M ESPE Filtek Supreme XT Flow + 3M ESPE Scotchbond Universal. The retention and marginal adaptation rates were highest for Grandio Flow and X Flow materials after 36 months, resulting in the highest score of clinical acceptability at 95.3% and 97.6%, respectively. The Tetric EvoFlow and Filtek Supreme XT Flow had the same retention rate after 36 months at 88.1%. Statistical significance was found in Grandio flow material in postoperative sensitivity criteria (p = 0.021). Tetric EvoFlow showed statistical differences in retention (p = 0.01), color match (p = 0.004), and marginal adaptation (p = 0.042). Filtek Supreme showed statistical differences in retention (p = 0.01) and marginal adaptation (p < 0.001). The flowable composite materials showed excellent clinical efficacy after 36 months of their clinical usage. There was no difference among the tested flowable composite materials quality in Small Class I restorations over time.

Mechanical testing of toughened resin composite materials

Composites ◽  
1988 ◽  
Vol 19 (4) ◽  
pp. 300-310 ◽  
Author(s):  
S. Lee ◽  
R.F. Scott ◽  
P.C. Gaudert ◽  
W.H. Ubbink ◽  
C. Poon
Keyword(s):  
Composite Materials ◽  
Mechanical Testing ◽  
Resin Composite

scholarly journals Surface Properties of Resin Composite Materials Relative to Biofilm Formation

2007 ◽  
Vol 26 (5) ◽  
pp. 613-622 ◽  
Author(s):  
Masahiro ONO ◽  
Toru NIKAIDO ◽  
Masaomi IKEDA ◽  
Susumu IMAI ◽  
Nobuhiro HANADA ◽  
...  
Keyword(s):  
Composite Materials ◽  
Surface Properties ◽  
Biofilm Formation ◽  
Resin Composite

scholarly journals The Effects of Surface Roughness of Composite Resin on Biofilm Formation of Streptococcus mutans in the Presence of Saliva

2012 ◽  
Vol 37 (5) ◽  
pp. 532-539 ◽  
Author(s):  
JW Park ◽  
CW Song ◽  
JH Jung ◽  
SJ Ahn ◽  
JL Ferracane
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Streptococcus Mutans ◽  
Biofilm Formation ◽  
Composite Resin ◽  
Resin Composite ◽  
Fluid Phase ◽  
Confocal Laser ◽  
Carbohydrate Source ◽  
Effect Of Surface

SUMMARY The purpose of this study was to investigate the effects of surface roughness of resin composite on biofilm formation of Streptococcus mutans in the presence of saliva. To provide uniform surface roughness on composites, disks were prepared by curing composite against 400-grit silicon carbide paper (SR400), 800-grit silicon carbide paper (SR800), or a glass slide (SRGlass). The surface roughness was examined using confocal laser microscopy. For biofilm formation, S. mutans was grown for 24 hours with each disk in a biofilm medium with either glucose or sucrose in the presence of fluid-phase or surface-adsorbed saliva. The adherent bacteria were quantified via enumeration of the total viable counts of bacteria. Biofilms were examined using scanning electron microscopy. This study showed that SR400 had deeper and larger, but fewer depressions than SR800. Compared to SRGlass and SR800, biofilm formation was significantly increased on SR400. In addition, the differences in the effect of surface roughness on the amount of biofilm formation were not significantly influenced by either the presence of saliva or the carbohydrate source. Considering that similar differences in surface roughness were observed between SR400 and SR800 and between SR800 and SRGlass, this study suggests that surface topography (size and depth of depressions) may play a more important role than surface roughness in biofilm formation of S. mutans.

Contemporary Use of Flowable Resin Composite Materials

Dental Update ◽  
2008 ◽  
Vol 35 (9) ◽  
pp. 600-606 ◽  
Author(s):  
Stephen J Bonsor
Keyword(s):  
Composite Materials ◽  
Resin Composite
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