scholarly journals Evaluation of Pre-heating Effects on Marginal Adaptation of Resin-based Materials

2018 ◽  
Vol 55 (2) ◽  
pp. 238-242 ◽  
Author(s):  
Ionut Taraboanta ◽  
Simona Stoleriu ◽  
Gianina Iovan ◽  
Antonia Moldovanu ◽  
Andrei Georgescu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Composite Resin ◽  
Optical Microscope ◽  
Marginal Adaptation ◽  
Gap Formation ◽  
Solution Ph ◽  
Filling Materials ◽  
Heating Effects ◽  
Direct Restoration ◽  
Materials Used

The aim of the study was to compare the marginal adaptation of three different resin-based materials used for direct restoration: hybrid composite resin (Gaenial Posterio, GC Corporation), a compomer (Dyract eXtra, Dentsply Sirona), and a giomer (Beautifil II, Shofu Dental) applied at room temperature or after preheated at preheating 50 and 60oC. Class II cavities were prepared on proximal surfaces of extracted teeth and randomly divided in 3 groups according to the material used for restoration. In each group five cavities were restored using the materials at room temperature (subgroup 1), five cavities were restored using preheated materials at 50şC (subgroup 2), and five cavities were restored using preheated materials at 60şC (subgroup 3). The teeth were stored in distilled water for 14 days and then were immersed in 2% methylene blue buffered dye solution (pH = 7) for 4 hours. The teeth were transversally cut and the sections were examined using optical microscope (Carl-Zeiss AXIO Imager A1m) at 50x magnification and the dye penetration was evaluated according to 4 scores. Decreased microleakage and fewer gap formation were recorded for all filling materials after they have been heated at 50 or 60oC. Pre-warming of resin-based materials improves the adaptation of these materials to tooth structures.

scholarly journals The Effect of Heating on Surface Microhardness of Resin-based Materials for Direct Restoration

2018 ◽  
Vol 55 (4) ◽  
pp. 584-589
Author(s):  
Simona Stoleriu ◽  
Gianina Iovan ◽  
Irina Nica ◽  
Galina Pancu ◽  
Andrei Victor Sandu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Vickers Microhardness ◽  
Composite Resin ◽  
Heating Temperature ◽  
Surface Hardness ◽  
Mean Value ◽  
Direct Restoration ◽  
Different Temperatures ◽  
Materials Used ◽  
Hardness Values

The aim of this study was to evaluate and to compare the surface hardness of three types of resin-based materials used for direct restoration after heating at different temperatures. A giomer (Beautifil II, Shofu Dental), a compomer (Dyract eXtra, Dentsply Sirona) and a hybrid composite resin (Gaenial Posterior, GC Corporation) were selected for this study. Twenty disk-shaped specimens of each material were heated at room temperature (21�C), at 37�C, at 50�C and at 60�C. Vickers microhardness test was performed on top and bottom surfaces using digital microhardness tester (Micro-Vickers Hardness System CV- 400DMTM, CV Instruments Namicon). The top and bottom surfaces VHN was calculated as a mean value of five determinations. Also, the microhardness ratio was calculated by dividing the top mean VHN value by bottom mean VHN value. Increased mean hardness values were recorded after heating, irrespective of resin-based tested materials. The highest hardness values were recorded after heating all three materials at 60�C, followed by the hardness recorded at 50�C, 37�C and 21�C. For top surfaces, the lowest hardness value was recorded in Dyract eXtra group when samples were warmed at room temperature and the highest hardness value was obtained in Beautifil II group when samples where heated at 60�C. For the bottom surfaces, Dyract eXtra specimens heated at 21�C presented the lowest hardness values and Beautifil II samples heated at 60�C presented the highest hardness values. On top and on bottom surfaces Dyract eXtra showed the lowest hardness values, followed by G-aenial Posterior and Beautifil II, irrespective the heating temperature.

The Effects of Temperature and Light Intensity on the Polymerization Shrinkage of Light-cured Composite Filling Materials

2006 ◽  
Vol 7 (3) ◽  
pp. 12-21 ◽  
Author(s):  
Ahmed A. Elhejazi
Keyword(s):  
Light Intensity ◽  
Room Temperature ◽  
Environmental Temperature ◽  
Composite Resin ◽  
Comparable Amount ◽  
Polymerization Shrinkage ◽  
Filling Materials ◽  
Lower Light ◽  
Effects Of Temperature ◽  
Effect Of Light

Abstract The aim of this study was to investigate the effect of light intensity on polymerization shrinkage of resin composites. The five materials tested were Lite-Fil (A) (LFA), Lite-Fil (P) (LFP), Z100, Palfique, (PAL) and Tetric (TRC). Two types of measurements were made to determine the effects of environmental temperature and light intensity. Results were analyzed by two-way analysis of variance (ANOVA) and Newman-Keuls procedure at (P<0.05). The changes in temperature and/or light intensity strongly affected composite shrinkage. The amount of shrinkage for LFP at 100% light intensity in room temperature (23°C) was 1.26% and increased up to 2.29% at 60°C. By raising the temperature to 37°C and dropping the light intensity to 42% (459mW/cm2), the amount of polymerization shrinkage was similar to that with full light intensity, and statistically there were no significant differences between 37°C, 45°C, and 60°C. Lower temperatures and lower light intensities produce lower values of shrinkage. However, if the light intensity is below 28%, higher temperatures (60°C) must be applied to obtain a comparable amount of shrinkage. Clinical Relevance Pre-heating composite resin materials at body temperature (37°C) is likely to improve physical properties and compensate any drop of light intensity. Citation Elhejazi AA. The Effects of Temperature and Light Intensity on the Polymerization Shrinkage of Light-cured Composite Filling Materials. J Contemp Dent Pract 2006 July;(7)3:012-021.

scholarly journals Bond strength of composite resin containing biomaterial S-PRG to eroded dentin

2017 ◽  
Vol 16 ◽  
pp. 1-10
Author(s):  
Alessandra Sanchez Coelho Lourenço ◽  
Ana Paula Almeida Ayres ◽  
Taís Fonseca Mantilla ◽  
Marcelo Giannini ◽  
Patricia Moreira de Freitas
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Optical Microscope ◽  
Fracture Pattern ◽  
Supersaturated Solution ◽  
Solution Ph ◽  
Microtensile Bond Strength ◽  
Significant Difference ◽  
Restorative Materials ◽  
Two Factors

Aim: To evaluate the bond strength of composite resin containing or not biomaterial (S-PRG) to sound/eroded dentine. Methods: Occlusal dentin of 30 human molars (n=15) had half of its surface kept uneroded, while on the other half an erosive lesion was produced by cycling in citric acid (pH 2.3) and supersaturated solution (pH 7.0). On both eroded (ED) and non-eroded (SD) substrates, two restorative systems (containing or not S-PRG) were tested. Composite resin cylinders were built and, after storage in water (24h), were submitted to bond strength test. The analysis of the fracture pattern was performed under an optical microscope (40x). The obtained values of bond strength (MPa) were submitted to ANOVA (two factors) and Tukey multiple comparisons tests (p<0.05). Results: According to the results, there was difference between substrates (<0.001) and restorative materials (p=0.002) evaluated. For the microtensile bond strength, the values obtained were: SDNB (47.6±12.2 MPa), SDWB (34.1±15.8 MPa), EDNB (31.1±8.3 MPa) and EDWB (15.5±13.6 MPa), revealing a statistically significant difference in the evaluated substrates and restorative materials. Conclusion: Bond strength of eroded substrate is inferior to the sound substrate and the restorative system containing S-PRG biomaterial influences negatively the results of bonding to sound/eroded dentin.

scholarly journals Effect of different bonding techniques on marginal adaptation of Harmonize composite resin at different storage times.

2020 ◽  
Author(s):  
Ebaa Ibrahim Alagha
Keyword(s):  
Composite Resin ◽  
Storage Period ◽  
Adhesive System ◽  
Marginal Adaptation ◽  
Gap Formation ◽  
Significance Level ◽  
Significant Difference ◽  
Post Hoc ◽  
Storage Times ◽  
Self Etch

Abstract Background This study evaluated the effect of different bonding techniques on marginal adaptation of Harmonize composite resin at different storage times. Methods Hundred twenty upper premolars were divided into two main groups (n = 60) according to the type of the adhesive system used (self-etch adhesive system or total etch adhesive system). Each group was further divided into three subgroups (20 teeth each) according to the storage times into one day, three months and six months. Standardized Class II cavities were prepared and restored with Harmonize composite incrementally. Teeth were stored in distilled water at room temperature. After each storage time, teeth were sectioned buccolingually into two halves and examined under digital stereomicroscope for the purpose of gap formation detection and scanning electron microscope examination was done to evaluate resin-dentin interfaces. The recorded values were tabulated and statistically analyzed. Regression model using three-way Analysis of Variance (ANOVA) was used for testing significance of the effect of adhesive system, storage period and their interactions on the mean gap area. Tukey’s post-hoc test was used for pair-wise comparisons between the groups when ANOVA test is significant. The significance level was set at P ≤ 0.05. Results Self-etch adhesive system showed statistically significant higher mean gap area than Total-etch adhesive system at the occlusal and cervical margins. Six months period showed the statistically significant highest mean gap area. There was no statistically significant difference between 1 day and 3 months periods; both showed the statistically significant lowest mean gap area values respectively at the occlusal and cervical margins. Conclusions Total-etch adhesive system enhances the marginal adaptation when compared to self-etch adhesive system and the storage period of composite resin in water has adverse effect on the marginal adaptation to all groups with time.

scholarly journals Penatalaksanaan Perawatan Saluran Akar pada Fraktur Gigi 21 disertai Perforasi

2019 ◽  
Vol 7 (1) ◽  
pp. 27-32
Author(s):  
Zieta Sakinah Emdi ◽  
Reni Nofika
Keyword(s):  
Root Canal ◽  
Composite Resin ◽  
Mineral Trioxide Aggregate ◽  
Root Canal Treatment ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Direct Restoration ◽  
Procedural Error ◽  
Horizontal Pressure ◽  
Materials Used

Root canal treatment aims to maintain the condition of the teeth in order to keep them functioning. In practice, the treatment procedure does not always run smoothly, the operator can face undesirable conditions that can affect the prognosis of treatment. A common procedural error during root canal treatment is a lateral root perforation which must be treated immediately to avoid further damage. The success of the perforation treatment is determined by the materials used. One of the bicompatible materials to seal lateral perforations using MTA (mineral trioxide aggregate). Successful root canal treatment affects treatment outcomes, so proper restoration is required to reduce the risk of marginal leakage. The choice of final restoration in post-root canal treatment depends on the amount of remaining tooth structure, horizontal pressure and chewing load. For post-root canal treatment anterior teeth with intact marginal edges, direct restoration can be performed using composite resin

scholarly journals THE STUDY OF BOUNDARY PERMEABILITY OF MATERIALS USED FOR FISSURE SEALING

2019 ◽  
Vol 15 (3) ◽  
pp. 62-68 ◽  
Author(s):  
Светлана Токмакова ◽  
Svetlana Tokmakova ◽  
Юлия Луницына ◽  
Yuliya Lunitsyna ◽  
Ольга Бондаренко ◽  
...  
Keyword(s):  
Dental Health ◽  
Optimal Choice ◽  
Anatomical Structure ◽  
Glass Ionomer ◽  
Filling Materials ◽  
Direct Restoration ◽  
Dye Permeability ◽  
Materials Used ◽  
Fissure Sealing

Introduction. Dental caries is a widespread dental disease with high intensity and has an impact on the dental health of the population. After teething fissures are the most susceptible to the development of caries in them, due to the peculiarities of their anatomical structure. One of the main directions of primary prevention of caries is the use of sealants for sealing fissures. As sealants are used modern materials from the group of glass ionomer cements, monomernye sealants and composite sealants. Due to the lack of currently clear indications and algorithms for minimally invasive interventions using filling materials in different clinical situations, a study of various materials for invasive fissure sealing in the laboratory. Purpose ― in vitro assess various materials for invasive fissure sealing. Methodology.The procedure of invasive sealing with the use of various filling materials was carried out on the removed intact teeth. Subsequently, the boundary adhesion of sealants was evaluated according to the criteria for direct restoration, as well as the dye permeability along the adhesion boundary. Results. On the basis of the obtained data, the optimal choice of filling materials during the methods of invasive sealing and preventive sealing is justified. Studies show the high potential of polymer composite sealants as a material for sealing fissures both imported and domestic production.

scholarly journals Does bonding to Dentin reduce Gap formation in Composite Restorations?

2012 ◽  
Vol 1 (2) ◽  
pp. 67-70
Author(s):  
Daniela Araújo Veloso Popoff ◽  
Murilo de Sousa Menezes ◽  
Andressa dos Santos Gomes ◽  
André Luis Faria-e-Silva ◽  
Paulo Vinícius Soares ◽  
...  
Keyword(s):  
Composite Resin ◽  
Marginal Adaptation ◽  
Gap Formation ◽  
Adhesive Systems ◽  
Experimental Conditions ◽  
Composite Restorations ◽  
Mechanical Cycling ◽  
Before And After ◽  
Composite Resin Restorations ◽  
Adhesive Application

ABSTRACT This study evaluated the effect of adhesive application only to enamel on the gap formation of composite resin restorations performed with different adhesive systems and submitted to mechanical cycling. Standardized cylinder-shaped cavities were prepared on the buccal surface of 60 bovine incisors. Two etchand-rinse [Adper Scotchbond Multi-purpose (3M ESPE, St. Paul, MN, USA) and Adper Single Bond 2 (3M ESPE)] and one selfetching [Clearfil SE Bond (Kuraray, Osaka, Japan)] adhesive systems were evaluated. The adhesives were applied only to enamel or to both dentin and enamel. After adhesive light activation, the cavities were restored with composite resin. The restorations were finished and polished; the marginal adaptation was analyzed using scanning electronic microscopy (SEM, 500× magnification) in low-vacuum mode. After the first evaluation, the samples were submitted to mechanical cycling (300,000 cycles of 80 kN and 1.5 Hz) and a new evaluation was performed. There was observed any gap for all experimental conditions before and after mechanical cycling. Bonding to dentin does not alter the marginal adaptation of composite restorations. How to cite this article Popoff DAV, Menezes MS, Gomes AS, Faria-e-Silva AL, Soares PV, Santos-Filho PC, Martins LRM. Does bonding to Dentin reduce Gap formation in Composite Restorations? Int J Experiment Dent Sci 2012;1(2):67-70.

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 COMPARATIVE EVALUATION OF THE MARGINAL ADAPTATION OF FOUR DIFFERENT COMPOSITE RESINS WITH OR WITHOUT PREHEATING – AN IN VITRO STUDY

2020 ◽  
Vol 4 (5) ◽  
Author(s):  
Mohanapriya R ◽  
Rajesh Gopal. V ◽  
A. Arvind Kumar ◽  
Benin Paulaian ◽  
Joselin . ◽  
...  
Keyword(s):  
Room Temperature ◽  
In Vitro Study ◽  
Monomer Conversion ◽  
Analysis Data ◽  
Composite Resins ◽  
Vitro Study ◽  
Marginal Adaptation ◽  
Gap Formation ◽  
Group I

Background: Resin composites as direct posterior restorative material was associated with the polymerization contraction and microleakage. Different methods have been introduced to overcome these drawbacks by increasing the degree of monomer conversion and to minimize the polymerization shrinkage. Composite preheating is an innovative method to improve the handling and physical properties. So this study was done to evaluate the effect of prepolymerization warming of different composites on the marginal adaptation.  Materials and Methods: This in vitro study was conducted on 80 extracted human maxillary premolars. Class II cavities on the proximal surface were prepared with the dimensions of 4 mm buccolingual width, 2 mm axial depth, and gingival margin at the cementoenamel junction. They were divided into four groups of 20 teeth each and were restored accordingly: Group I – Bulkfill nanohybrid; Group II – Nanofill; Group III – Ormocer; Group IV – microhybrid composites. Each group was further sub - divided into subgroups of 10 teeth, according to the preheated composites and room temperature composites used. After restorative procedures, samples were sectioned in the mesiodistal direction through the centre of the restoration and analysed using Scanning Electron Microscope at 200x magnification and marginal gap width was measured in three areas at the axial wall using Image Processing and Analysis in Java (ImageJ 1.5 2a) software. Statistical Analysis: Data was entered in Statistical Package for Social Sciences version 21 Software for Windows. The comparisons of four different composite materials with two subgroups were analyzed using Kruskal Wallis test. The level of significance was kept at   p < 0.05. Results: Preheating results in more gap formation with the bulk fill nanohybrid and Ormocer showed higher MQ4 scores than the room temperature composites. No statistically significant results were found. But the percentage of gap formation was comparatively higher in preheated composite group. Conclusion: Within the limitations of the present study, it could be concluded that preheated composites showed poor internal marginal adaptation with increased frequency of gap formation. Key words: Internal marginal adaptation, Ormocer, Filtek nanofill, Microhybrid, Tetric bulk fill

EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING

2020 ◽  
Vol 4 (141) ◽  
pp. 157-163
Author(s):  
IL’YA ROMANOV ◽  
◽  
ROMAN ZADOROZHNIY
Keyword(s):  
Wear Resistance ◽  
Reference Sample ◽  
Optical Microscope ◽  
Research Purpose ◽  
Tribotechnical Properties ◽  
Uncoated Surface ◽  
Before And After ◽  
Materials Used ◽  
Friction Track

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.

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