scholarly journals Influence Of Different Led Curing-Units On Depth Of Cure and Micro-Hardness Of Nano-Hybrid Resin Composite

2021 ◽  
Author(s):  
Alper KAPDAN ◽  
Seher KAYA ◽  
Digdem EREN
Keyword(s):  
Resin Composite ◽  
Micro Hardness ◽  
Depth Of Cure ◽  
Hybrid Resin

scholarly journals Effect of Polymerization Time and Shade on the Depth of Cure of Nano-Hybrid Resin Composites

2021 ◽  
Vol 2 (01) ◽  
pp. 28-33
Author(s):  
Noha Abdullah Bin Jabr ◽  
Wacim Nassouh Al-Saidi ◽  
Ibtessam Abdullah Bin Jabr ◽  
Roula Safouh Al-Bounni
Keyword(s):  
Resin Composite ◽  
Multiple Comparisons ◽  
Descriptive Statistics ◽  
Resin Composites ◽  
Polymerization Time ◽  
Depth Of Cure ◽  
Hybrid Resin ◽  
The Mean ◽  
Spss Software ◽  
Post Hoc

Abstract Objective The effect of polymerization time and resin shade on the depth of cure (DOC) of two nano-hybrid resin composites (Filtek Z250 XT and IPS Empress Direct) was evaluated and compared. Materials and Methods Sixty specimens were prepared from two shades (A1 and A3) of the resin composites. The specimens were allocated into two groups that were further divided into three subgroups depending on the polymerization time (20, 40, and 60 sec; n = 5). After that, the DOC was evaluated by calculating the polymerized part of the specimen’s thickness to the nearest (0.01 mm) using a high-accuracy micrometer. Each specimen was measured three times, and the corresponding mean reading (in mm) was divided by two to obtain the DOC. The data were analyzed using SPSS software, version 20. Descriptive statistics followed by three-way analysis of variance was applied. Multiple comparisons were made using Scheffe post hoc tests (α = 0.05). Results Filtek Z250 XT-A1-60sec presented with the greatest DOC (7.42 ± 0.47 mm), and the lowest DOC was obtained with IPS Empress-A3-20sec (2.31 ± 0.21 mm). The mean DOC of Filtek Z250 XT and IPS Empress Direct resin composites were 6.18 mm and 3.59 mm, respectively. Statistically significant (p < 0.05) difference was observed between the resin composites. The interaction between independent factors, namely composites, resin shade, and polymerization time, revealed that interaction between them contributed significantly to the DOC (p ≤0.05). However, the interaction between resin shade and the polymerization time was insignificant (p = 0.148). Conclusion Filtek Z250 XT demonstrated greater DOC than IPS Empress Direct resin composite. An increase in polymerization time significantly enhanced the DOC of the resin composites irrespective of the resin shade. Regardless of the resin composite tested, DOC was lower for darker shades (A3).

scholarly journals Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

2016 ◽  
Vol 35 (3) ◽  
pp. 418-424 ◽  
Author(s):  
Akimasa TSUJIMOTO ◽  
Wayne W. BARKMEIER ◽  
Toshiki TAKAMIZAWA ◽  
Mark A. LATTA ◽  
Masashi MIYAZAKI
Keyword(s):  
Mechanical Properties ◽  
Resin Composite ◽  
Short Fiber ◽  
Volumetric Shrinkage ◽  
Fiber Reinforced ◽  
Depth Of Cure

scholarly journals Efficacy of In-office Bleaching on Microhardness of Permanent Teeth with Antioxidant Re-hardening

2019 ◽  
Vol 13 (1) ◽  
pp. 436-442
Author(s):  
Esra G Çakir ◽  
Suat Özcan ◽  
Ibrahim Tulunoglu ◽  
Mine B. Üçtaşli ◽  
Ozlem Tulunoglu
Keyword(s):  
Resin Composite ◽  
Calcium Nitrate ◽  
Third Molar ◽  
Permanent Teeth ◽  
Sodium Ascorbate ◽  
Micro Hardness ◽  
Bleaching Procedure ◽  
Enamel Structure ◽  
Hardness Values ◽  
Bleaching Treatment

Background: Bleaching procedures affect surface enamel structure and decrease its bonding ability to resin composite restorative materials. The application of re-hardening materials to bleached enamel surfaces may prevent this decrease in micro-hardness. Objective: This in-vitro study aims to evaluate the surface micro hardness of human teeth enamel subjected to bleaching with Zoom Advanced Power 2 AP (Phillips, USA), and Opalescence Boost (Ultradent, USA) and compare the re-hardening effects of 10% Sodium Ascorbate, 2% acidulated phosphate fluoride gel, and a 5% Potassium nitrate 0.22% Sodium Fluoride + Calcium Nitrate gel. Methods: Ninety human third molar teeth were used. The specimens were randomly assigned to 5 groups. After the bleaching procedure, the specimens were treated with APF, Sodium Ascorbate or Relief gel as re-hardening agents with 30 teeth in each group. Enamel micro-hardness was measured with Vickers Micro-hardness Tester. The data were evaluated with Kolmogorov-Simirnov, one-way ANOVA, Dunnett’s test, post-hoc Tukey and T-tests. Results: Statistical analysis revealed no significant differences among initial enamel groups’ micro-hardness values (P>.05); however, significant differences occurred between initial and after bleaching treatment group value for G3 (P< .05). After re-hardening, only the Sodium Ascorbate group showed a statistically significant increase with hardness values (P< .05) for G4 and G5. Conclusion: Bleaching treatment conducted with light had no adverse effect on enamel micro-hardness. Sodium Ascorbate can be useful after bleaching to change the adverse effects of bonding on the enamel.

The effect of a translucent post on resin composite depth of cure

2004 ◽  
Vol 20 (7) ◽  
pp. 617-622 ◽  
Author(s):  
H ROBERTS ◽  
D LEONARD ◽  
K VANDEWALLE ◽  
M COHEN ◽  
D CHARLTON
Keyword(s):  
Resin Composite ◽  
Depth Of Cure

Influence of Different Restoration Techniques on Fracture Resistance of Root-filled Teeth: In Vitro Investigation

2018 ◽  
Vol 43 (2) ◽  
pp. 162-169 ◽  
Author(s):  
ME Hshad ◽  
EE Dalkılıç ◽  
GC Ozturk ◽  
I Dogruer ◽  
F Koray
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Compressive Force ◽  
Control Group ◽  
Hybrid Resin ◽  
Flowable Composite ◽  
In Vitro Investigation ◽  
Significant Difference

SUMMARY Objective: The purpose of this study was to determine the fracture strength of endodontically treated mandibular premolar teeth restored with composites and different reinforcement techniques. Methods and Materials: Forty-eight freshly extracted human mandibular premolar teeth were randomly divided into four groups: group IN, group CR, group FRC, and group PRF. Group IN consisted of teeth with intact crowns and served as the control group. In the other three groups, endodontic treatment was performed and standard mesio-occluso-distal (MOD) cavities were prepared. Then cavities were restored with hybrid resin composite only, flowable composite and hybrid resin composite, and Ribbond, flowable composite and hybrid resin composite in groups CR, FRC and PRF, respectively. All of the teeth were subjected to fracture by means of a universal testing machine, and compressive force was applied with a modified stainless-steel ball at a crosshead speed at 0.5 mm/min. Results: The highest values were observed in group IN, while the lowest values were determined in group CR. There was not any statistically significant difference between group CR and group FCR (p&gt;0.05). When groups CR, FCR, and PRF were compared, group PRF showed significantly better fracture strength than did groups CR and FCR (p&lt;0.05). It was determined that there was not any significant difference between group IN and group PRF (p&gt;0.05). Conclusions: Polyethylene ribbon fiber considerably increases the fracture strength of mandibular premolar teeth with MOD cavities restored with composite.

Study on fatigue strength and wear resistance of hybrid resin composite with cluster filler

2017 ◽  
Vol 2017.92 (0) ◽  
pp. M823
Author(s):  
Takuya SAKAGUCHI ◽  
Izuru NISHIKAWA ◽  
Takahiro KATO ◽  
Teruo ANRAKU
Keyword(s):  
Wear Resistance ◽  
Fatigue Strength ◽  
Resin Composite ◽  
Hybrid Resin

Clinical Evaluation of Indirect Composite Restorations at Baseline and 36 Months After Placement

2010 ◽  
Vol 35 (2) ◽  
pp. 156-164 ◽  
Author(s):  
W. Dukic ◽  
O. L. Dukic ◽  
S. Milardovic ◽  
B. Delija
Keyword(s):  
Clinical Evaluation ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Good Choice ◽  
Hybrid Resin ◽  
Composite Restorations ◽  
Clinical Difference ◽  
Indirect Composite

Clinical Relevance Indirect resin composite restorations represent a good choice for the therapy of severely damaged teeth. There is no clinical difference between Ormocer and nano-hybrid resin composite after 36 months.

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