scholarly journals Hybrid Dental Composites Biomechanical Properties

2020 ◽  
Vol 57 (3) ◽  
pp. 70-80
Author(s):  
Claudia Nicoleta Feurdean ◽  
Anida-Maria Babtan ◽  
Anca Ionel ◽  
Aranka Ilea ◽  
Dan Buhatel ◽  
...  
Keyword(s):  
Water Absorption ◽  
Vickers Microhardness ◽  
Hybrid Composites ◽  
Dental Materials ◽  
In Vitro Study ◽  
Triethylene Glycol ◽  
Biomechanical Properties ◽  
Oral Health Status ◽  
Tensile Strenght

In the last two decades, both general and oral health status became more important for individuals, being associated to their quality of life, social provenance and income. Society�s evolution is associated to high expectations regarding edentulous and decays treatment. Metal filling such as gaudent or amalgam have been replaced by aesthetic materials, to achieve similarity to the patient�s genuine biological tissue. Along with the aesthetic demand, dental materials have to fulfill biocompatibility and mechanical properties proximate to healthy soft either hard tissues. Composite materials have the advantages of accomplishing biological and mechanical demands and to be accessible financially, compared to ceramics. Composites are classified according to the main monomer, filling, particles� dimension, addition of external molecules, this entirety having a direct influence on materials� properties. The objective of this prospective interventional in vitro study was to evaluate biomechanical properties of four different hybrid composites: Premise direct™ - Premise indirect™ (Kerr, Orange, California, USA), Gradia� Direct (GC, Alsip, Illinois, USA) and Ceramage� (SHOFU Dental, Ratinger, Germany). Vickers microhardness, compressive strenght, direct tensile strenght, water absorption and solubility were assessed. The results showed that microfilled hybrid composites UDMA (urethane dimethacrylate)-based monomer had the highest evaluations regarding Vickers microhardness, compressive strenght and tensile strenght, whereas water absorption was the highest for nanofilled hybrid Bis-GMA (bisphenol A-glycidyl methacrylate)/TEGDMA (triethylene glycol dimethacrylate), and solubility for microfilled hybrid UDMA based monomer.

scholarly journals Effect of Cavity Disinfectants on Adhesion to Primary Teeth—A Systematic Review

2021 ◽  
Vol 22 (9) ◽  
pp. 4398
Author(s):  
Ana Coelho ◽  
Inês Amaro ◽  
Ana Apolónio ◽  
Anabela Paula ◽  
José Saraiva ◽  
...  
Keyword(s):  
Primary Teeth ◽  
Clinical Success ◽  
Dental Materials ◽  
In Vitro Study ◽  
In Vitro Studies ◽  
Cochrane Library ◽  
Promising Alternative

Some authors have been proposing the use of cavity disinfectants in order to reduce, or even eliminate, the effect of the microorganisms present in a dental cavity before a restoration is placed. The aim of this study was to evaluate the effect of different cavity disinfectants on bond strength and clinical success of composite and glass ionomer restorations on primary teeth. The research was conducted using Cochrane Library, PubMed/MEDLINE, SCOPUS, and Web of Science for articles published up to February 2021. The search was performed according to the PICO strategy. The evaluation of the methodological quality of each in vitro study was assessed using the CONSORT checklist for reporting in vitro studies on dental materials. Sixteen in vitro studies and one in situ study fulfilled the inclusion criteria and were analyzed. Chlorhexidine was the most studied cavity disinfectant, and its use does not compromise dentin bonding. Sodium hypochlorite is a promising alternative, but more research on its use is required to clearly state that it can safely be used as a cavity disinfectant for primary teeth. Although other disinfectants were studied, there is a low-level evidence attesting their effects on adhesion, therefore their use should be avoided.

scholarly journals Predictability of Microbial Adhesion to Dental Materials by Roughness Parameters

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 456 ◽  
Author(s):  
Andrea Schubert ◽  
Torsten Wassmann ◽  
Mareike Holtappels ◽  
Oliver Kurbad ◽  
Sebastian Krohn ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Biofilm Formation ◽  
Dental Materials ◽  
Roughness Parameter ◽  
In Vitro Study ◽  
Mean Deviation ◽  
Roughness Parameters ◽  
Microbial Adhesion

Microbial adhesion to intraoral biomaterials is associated with surface roughness. For the prevention of oral pathologies, smooth surfaces with little biofilm formation are required. Ideally, appropriate roughness parameters make microbial adhesion predictable. Although a multitude of parameters are available, surface roughness is commonly described by the arithmetical mean roughness value (Ra). The present study investigates whether Ra is the most appropriate roughness parameter in terms of prediction for microbial adhesion to dental biomaterials. After four surface roughness modifications using standardized polishing protocols, zirconia, polymethylmethacrylate, polyetheretherketone, and titanium alloy specimens were characterized by Ra as well as 17 other parameters using confocal microscopy. Specimens of the tested materials were colonized by C. albicans or S. sanguinis for 2 h; the adhesion was measured via luminescence assays and correlated with the roughness parameters. The adhesion of C. albicans showed a tendency to increase with increasing the surface roughness—the adhesion of S. sanguinis showed no such tendency. Although Sa, that is, the arithmetical mean deviation of surface roughness, and Rdc, that is, the profile section height between two material ratios, showed higher correlations with the microbial adhesion than Ra, these differences were not significant. Within the limitations of this in-vitro study, we conclude that Ra is a sufficient roughness parameter in terms of prediction for initial microbial adhesion to dental biomaterials with polished surfaces.

scholarly journals Evaluation of the Effect of Water on Three Different Light Cured Composite Restorative Materials Stored in Water: An In Vitro Study

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Basawaraj Biradar ◽  
Sudharani Biradar ◽  
Arvind MS
Keyword(s):  
Water Absorption ◽  
Physical And Mechanical Properties ◽  
In Vitro Study ◽  
Vitro Study ◽  
Weight Changes ◽  
Significant Difference ◽  
Restorative Materials ◽  
Group A ◽  
Group B

Objectives. The objective of this in vitro study was to investigate whether weight gain or loss in the three different composites occurs due to water absorption when they are stored in water.Methods. The composite restorative materials selected for this study included a microfine hybrid (Synergy) and two nanofilled composite restorative materials (Ceram X and Filtek Supreme Ultra). Twenty specimens of each material were fabricated of each composite material. Group A: Filtek Supreme Ultra, Group B: Synergy, Group C: Ceram X. Then all the specimens were stored in 10 ml Distilled water containing test tubes and placed in incubator at 37°C for six weeks. The weight changes of these specimens were measured daily for the first week and later once a week for next five weeks by using an electrical analytical balance.Results.The data was analyzed by one-way analysis of variance and Student'sttest. All groups showed maximum amount of water absorption in the first week than gradual decrease in the water absorption from the second to the sixth week, as compared to the first week and there is no statistically significant difference between the groups tested.Conclusion. All the composite restorative material absorbs some amount of water. The water absorption of the composite may decrease the physical and mechanical properties of the composites; hence it is necessary to consider the type of the material before starting the treatment.

scholarly journals Comparing marginal microleakage of three different dental materials in veneer restoration using a stereomicroscope: an in vitro study

BDJ Open ◽  
2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Shuang Jia ◽  
Dong Chen ◽  
Defang Wang ◽  
Xiangjun Bao ◽  
Xiaomei Tian
Keyword(s):  
Dental Materials ◽  
In Vitro Study ◽  
Vitro Study

scholarly journals Influence of Oscillating Packing Instrument on Microhardness of Bulk-Fill Composite: In Vitro Study

2020 ◽  
Vol 8 (D) ◽  
pp. 146-149
Author(s):  
Emad Mohamed Bayoumi ◽  
Mohamed Farid Riad ◽  
Mohamed Mostafa Zayed ◽  
Mostafa Abou Shelib ◽  
Ahmed Mohamed Bayoumi ◽  
...  
Keyword(s):  
Vickers Microhardness ◽  
In Vitro Study ◽  
Vitro Study ◽  
Significant Difference

AIM: This study aimed to assess Vickers microhardness of Tetric EvoCeram Bulk Fill composite that was packed manually and using oscillating packing device. MATERIALS AND METHODS: Two different packing techniques were applied on Tetric EvoCeram Bulk Fill composite. For each packing technique, ten specimens (6 mm in diameter and 4 mm height) were prepared using a black-shaded Teflon mold. The resin was inserted in a bulk increment either packed manually or using Compothixo oscillating device and then light-cured for 40 s. Microhardness was analyzed at the top and the bottom surfaces. RESULTS: Overall, for both packing techniques, microhardness decreased significantly with the increase of depth. Tetric EvoCeram Bulk Fill composite when packed either manually or using oscillating device, did not show significant difference neither at the top surfaces of both applied techniques nor at the bottom surfaces of both applied techniques. CONCLUSION: Different packing techniques did not influence the microhardness of Tetric EvoCeram Bulk Fill composite.  

scholarly journals Biomechanical Properties of the Cranial Dura Mater with Puncture Defects : An In Vitro Study

2019 ◽  
Vol 62 (4) ◽  
pp. 382-388 ◽  
Author(s):  
Hasan Emre Aydın ◽  
Ceren Kızmazoglu ◽  
Ismail Kaya ◽  
Bugra Husemoglu ◽  
Gulden Sozer ◽  
...  
Keyword(s):  
Dura Mater ◽  
In Vitro Study ◽  
Biomechanical Properties ◽  
Vitro Study

scholarly journals Efeito da aplicação prévia ou adição de dessensibilizantes em géis de peróxido de hidrogênio no esmalte clareado

2021 ◽  
Vol 10 (7) ◽  
pp. e18610716467
Author(s):  
Vinicius Matheus Amorim Macêdo ◽  
Mariana Evangelista Santos ◽  
Rosângela Marques Duarte ◽  
Sônia Saeger Meireles
Keyword(s):  
Vickers Microhardness ◽  
In Vitro Study ◽  
Potassium Nitrate ◽  
The Other ◽  
Color Measurement ◽  
Whitening Effect ◽  
Treatment Groups ◽  
Desensitizing Agents ◽  
Bleaching Gels

This in vitro study evaluated the effect of 35% hydrogen peroxide (35HP) gels with different desensitizing agents on color, microhardness and roughness of bleached enamel. Forty enamel-dentin specimens (6x6x2 mm2) were obtained from twenty human molars. After color measurement with a spectrophotometer, the specimens were randomized into four groups (n= 10): 35HPw- 35HP without desensitizing agent; 35HPCa- 35HP with calcium; 35HPK- 35HP with 0.5% potassium nitrate; 35HPTFa- 35HPw + topical application of 5% potassium nitrate and 2% sodium fluoride (TFa). Specimens were evaluated for color (∆Eab* and ∆E00), Vickers microhardness (VHN) and, superficial and volumetric roughness (Ra and Sa, µm) using a 3D non-contact profilometer before and 1-week after bleaching. Data were analyzed by ANOVA and Tukey tests (p< 0.05). Both treatment groups promoted a significant whitening effect and there was no difference between them for any color parameters evaluated. All groups reduced significantly the VHN, but the 35HPK showed a reduction significantly major than the other groups. 35HPCa and 35HP+TFa did not avoid the of Ra and Sa increasing. It can be concluded that 35HP bleaching gels with different desensitizing agents did not affect the whitening efficacy. However, all treatments decreased the microhardness, the addition of calcium into 35HP gel and the application of TFa before bleaching did not revert the enamel roughness under in vitro conditions.

Comparison of the Biomechanical Properties of the Advanta V12/iCast and Viabahn Stent-Grafts as Bridging Devices in Fenestrated Endografts: An In Vitro Study

2020 ◽  
Vol 27 (2) ◽  
pp. 258-265 ◽  
Author(s):  
Giovanni Federico Torsello ◽  
Monika Herten ◽  
Markus Müller ◽  
André Frank ◽  
Giovanni B. Torsello ◽  
...  
Keyword(s):  
Shear Stress ◽  
Stent Graft ◽  
In Vitro Study ◽  
Biomechanical Properties ◽  
Control Device ◽  
In Vitro Tests ◽  
Stent Grafts ◽  
Repair Materials ◽  
Stent Diameter

Purpose: To compare experimentally the biomechanical properties of the Viabahn Balloon-Expandable Stent Graft (VBX) with the widely used Advanta V12/iCast in the role of bridging stent-grafts for fenestrated endovascular aortic repair. Materials and Methods: Test sheets made of polyester having 2 rows of 5 fenestrations in 6-mm and 8-mm diameters were used to simulate a commercially made fenestrated aortic endograft. In total, 40 stent-grafts measuring 6×39 mm and 8×39 mm (10 of each size for each stent-graft) were implanted in fenestration sheets immersed in a 37°C water bath. After flaring, all stent-grafts were evaluated using microscopy and radiography. Biomechanical evaluation included pullout and the shear stress force testing; results are reported in Newtons (N) as the median (minimum–maximum). Results: After flaring, no damage or fracture to the stent-graft structures were detected. Pullout forces for the 6-mm stent-grafts were 27.1 N (20.0–28.9) for the VBX and 16.6 N (14.7–19.2) for the Advanta (p=0.008). Pullout forces for the 8-mm stent-grafts were 20.1 N (14.8–21.5) for the VBX and 15.8 N (12.4–17.5) for the Advanta (p=0.095). The shear stress forces necessary to dislocate the device at 150% stent diameter displacement was 12.5 N (VBX) vs 14.7 N (Advanta) for the 6-mm devices and 23.3 N (VBX) vs 20.2 N (Advanta) for the 8-mm stents (p>0.99 and p=0.222, respectively). Conclusion: In vitro tests simulating external pull and shear forces on bridging stent-grafts implanted in fenestrations showed that the VBX had resistance to dislocation equivalent to a well-known control device.

In vitro study of the effects of fluoride-releasing dental materials on remineralization in an enamel erosion model

2012 ◽  
Vol 40 (3) ◽  
pp. 255-263 ◽  
Author(s):  
San Ling Zhou ◽  
Jun Zhou ◽  
Shigeru Watanabe ◽  
Koji Watanabe ◽  
Ling Ying Wen ◽  
...  
Keyword(s):  
Dental Materials ◽  
In Vitro Study ◽  
Vitro Study ◽  
Erosion Model ◽  
Enamel Erosion
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