Mechanical and surface properties analysis of restorative materials submitted to erosive challenges in situ

Guedes, Ana Paula Albuquerque; Oliveira-Reis, B.; Catelan, Anderson; Suzuki, Thaís Yumi Umeda; Briso, André Luiz Fraga; Santos, Paulo Henrique dos

doi:10.4103/ejd.ejd_188_18

Cited by 13 publications

(15 citation statements)

References 22 publications

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“…19 The organic matrix, the filler particle and the polishing of the restorations can increase the physical properties making it more resistant to degradation. 37 Inadequate polymerization of adhesive resin-based restorations has been related to clinical failures due to a greater chance of fracture, secondary caries, and/or premature wear. 35,38,39 Overall, DoC is evaluated according to ISO 4049 standard, but comparing the ISO standard with hardness profile, it was found that there is an overestimation in relation to the DoC.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Experimental Composites with Different Photoinitiator

et al. 2021

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Objective The effect of different photoinitiators on mechanical properties of experimental composites was evaluated. Materials and Methods Resin composites were formulated by using a blend of bisphenol A-glycidyl and triethylene glycol (50/50 wt%) dimethacrylate monomers, and 65 wt% of barium aluminium silicate and silica filler particles. Photoinitiators used were 0.2% camphorquinone (CQ) and 0.8% co-initiator (DMAEMA); 0.2% phenyl-propanedione and 0.8% DMAEMA; 0.1% CQ + 0.1% phenyl propanedione and 0.8% DMAEMA; 0.42% mono(acyl)phosphine oxide (MAPO); and 0.5% bis(acyl)phosphine oxide (BAPO). Specimens (n = 10) were light cured by using a multiple-emission peak light-emitting diode for 20 seconds at 1,200 mW/cm2 of irradiance and Knoop hardness and plasticization, depth of cure, flexural strength, and elastic modulus were evaluated. Data were statiscally analyzed at significance level of α = 5%. Results Experimental composites containing MAPO and BAPO photoinitiators showed the highest values of flexural strength, elastic modulus, top surface hardness, and lower hardness reduction caused by alcohol compared with CQ. Composites containing CQ and PPD showed similar results, except for depth of cure and hardness of bottom surface. Conclusion BAPO and MAPO showed higher flexural strength, elastic modulus, hardness on top surface, and lower polymer plasticization to CQ.

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Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Experimental Composites with Different Photoinitiator

et al. 2021

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“…While it would be tempting to relate the beginning of wear due to silane degradation, 13,14,21 resin composite surface wear is a multifactorial phenomenon and is usually material dependent and cannot be predicted from resin composite category, filler loading, and resin matrix. 22,23 Other effects of degradation may include reduction of fracture toughness, 24 flexure strength, 25,26 surface roughness, 27,28 all of which may cause early restoration failure.…”

Section: Discussionmentioning

confidence: 99%

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

2020

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Objective This study' s purpose was to examine the flexural properties of five direct restorative resin composites stored up to 30 months after the expiration date. Materials and Methods Ambient-stored materials had pre-expiration date baseline flexure strength values as per ISO 4049 (n = 20). All materials were used per manufacturer guidelines, photopolymerized on both sides using a LED-based visible light curing unit, and stored in 0.2M phosphate buffered saline. At 24 hours, specimens were stressed to failure in three-point bend at a 0.5 mm/min cross head speed. Additional samples were made at 3, 6, 9, 12, 15, 18, 24, and 30 months past expiration date. Young’s modulus (flexural) was ascertained using the linear slope of the stress-stain curve. Statistical Analysis The mean data was found to contain a non-normal distribution and irregular variance which was compared using Kruskal–Wallis with Dunn’s posthoc testing.Also, Pearson’s correlation analysis was used to identify possible similar degradation behavior between products within both flexure strength and modulus determinations. A 95% level of confidence (α = 0.05) was used. Results Materials maintained similar to baseline flexure strength and modulus for up to 15 months past expiration date with two materials being similar at 30 months. However, clinicians were still advised to follow expiration dates, as resin composite degradation mechanisms are complex and vital constituents might degrade that are not overtly identified by clinical handling characteristics. No dental shelf life standards exist and manufacturers are requested to provide protocol information used in determining shelf life expiration.

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“…Even with the clinical insertion like ceramic laminates, the use of resin restorations is still very common because of its cost-effectiveness and its more conservative preparation. In the field of restorative dentistry, it has been proved that the action of acidic beverages on resin composites may cause changes in their microhardness due to the disruption of the interactions between the monomers present in their polymeric matrixes [4].…”

Section: Introductionmentioning

confidence: 99%

Topography and Microhardness Changes of Nanofilled Resin Composite Restorations Submitted to Different Finishing and Polishing Systems and Erosive Challenge

Vieira

Alexandria

Magno

et al. 2020

Pesqui. Bras. Odontopediatria Clín. Integr.

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How to cite this article: Canto FMT, Alexandria AK, Magno MB, Silva EM, Maia LC. Topography and microhardness changes of nanofilled resin composite restorations submitted to different finishing and polishing systems and erosive challenge. Pesqui Bras Odontopediatria Clín Integr. 2020; 20:e4812. https://doi. AbstractObjective: To evaluate the topography and microhardness of composite resin restorations submitted to different finishing and polishing systems before and after erosive challenge. Material and Methods: Thirty standardized cavities prepared in enamel-dentin blocks of bovine incisors were restored with Z350 composite resin, and randomly distributed into three groups (n=10) according to the finishing and polishing systems: G1 = Soflex 4 steps, G2 = Soflex Spiral 2 steps and G3 = PoGo (single step). The specimens were half protected with nail varnish and submitted to five immersions in Pepsi Twist ® , for 10 minutes each, five times/day during six consecutive days. The initial and final challenge surface microhardness (SMHinitial and SMHfinal) of the composite resin was evaluated and the percentage of SMH loss (%SMHL) was calculated. After protection removal, the topographic change linear (Ra) and volumetric (Sa) roughness was evaluated in initial and final areas by using 3D non-contact optical profilometry and scanning electron microscopy (SEM). Data were analyzed by paired Student's t-test, Kruskal-Wallis test, and by ANOVA and Tukey's test. Results: There was significant intra-group %SMHL in composite resin (p<0.05). Differences among groups in %SMHL, Ra/Sa in resin composite were not observed (p>0.05). SEM images revealed structural changes between the initial and final surfaces for all groups. Conclusion: The three types of finishing and polishing systems had a similar influence on %SMHL, Ra and Sa in the nanofilled composite resin.

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Mechanical and surface properties analysis of restorative materials submitted to erosive challenges in situ

Cited by 13 publications

References 22 publications

Mechanical Properties of Experimental Composites with Different Photoinitiator

Mechanical Properties of Experimental Composites with Different Photoinitiator

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

Topography and Microhardness Changes of Nanofilled Resin Composite Restorations Submitted to Different Finishing and Polishing Systems and Erosive Challenge

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