scholarly journals Compressive strength differences between hybrid composites using post curing light box with LED and dry heating, in vitro

2011 ◽  
Vol 23 (3) ◽  
Author(s):  
Jenny Krisnawaty ◽  
Setiawan Natasasmita ◽  
Dudi Aripin
Keyword(s):  
Compressive Strength ◽  
Composite Resin ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Composite Resins ◽  
Dry Heat ◽  
Hybrid Type ◽  
Significant Difference ◽  
Dry Heating

A hybrid type of composite resins is used as dental restorative materials in a wide cavity directly or indirectly. The mechanical properties of the composite resin would increase post-curing. The purpose of this study was to determine the differences between the compressive strength of hybrid type composite resin post-curing using LED light box and dry heating. This type of research was a quasi-experimental in vitro with the sample size of 30 samples which were divided into two groups. Each sample was tested using a Universal Testing Machine (Lloyd) at a speed of 1 mm/minute to test the compressive strength. Compressive strength values were recorded when the sample broke. The average value of compressive strength of the two treatment groups was statistically calculated using t-test. The results, of this study, showed that a hybrid composite resin with post curing using a light box with LED was at 194.138 Mpa which was lower than using the dry heat of 227.339 Mpa. It showed the statistically significant difference. The conclusion of this study was that the compressive strength of post-cured hybrid composites using a light box with LED was significantly lower than the post-curing using dry heat.

scholarly journals Compressive strength measurements of hybrid dental composites treated with dry heat and light emitting diodes (LED) post cure treatment

2014 ◽  
Vol 26 (3) ◽  
Author(s):  
Jenny Krisnawaty ◽  
Setiawan Natasasmita ◽  
Dudi Aripin
Keyword(s):  
Compressive Strength ◽  
Hybrid Composite ◽  
Light Emitting Diodes ◽  
Composite Resin ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Dental Composite ◽  
Light Emitting ◽  
Led Light ◽  
Dry Heat

Hybrid composites are mostly used on large cavities as restorative dental materials, whether it is used directly or indirectly. The mechanical properties of composite resin shall increase if it is treated with post cure treatment. The aim of this study is to evaluate compressive strength differences between dry heat and Light Emitting Diodes (LED) treatment on the hybrid dental composite. A quasi-experimental was applied on this research with a total of 30 samples that were divided into two groups. Each sample was tested using LLOYD Universal Testing Machine with 1 mm/min speed to evaluate the compressive strength. The compressive strength results were marked when the sample was broken. The results of two groups were then analyzed using t-test statistical calculation. The results of this study show that post cure treatment on hybrid composite using LED light box (194.138 MPa) was lower than dry heat treatment (227.339 MPa), which was also significantly different from statistical analysis. It can be concluded that compressive strength of LED light box was lower than dry heat post-cure treatment on the hybrid composite resin.

scholarly journals Effects of filler volume of nanosisal in compressive strength of composite resin

2017 ◽  
Vol 50 (4) ◽  
pp. 183
Author(s):  
Dwi Aji Nugroho ◽  
W. Widjijono ◽  
N. Nuryono ◽  
Widya Asmara ◽  
Wijayanti Dwi Aastuti ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fossil Fuels ◽  
Composite Resin ◽  
Testing Machine ◽  
Natural Fibers ◽  
Composite Resins ◽  
Inorganic Filler ◽  
Filler Materials ◽  
Significant Difference ◽  
Volume Group

Background: One of the composite resin composition is inorganic filler. The production of inorganic filler materials was highly dependent on non-degradable, and nonrenewable fossil fuels. Therefore, natural fibers can be used as substitute for inorganic fillers. One that can be developed is sisal. Purpose: This study aimed to determine the effects of nanosisal filler volume on compressive strength of composite resin. Methods: In this study, composite resins with nano-sized sisal as filler were manufactured and labeled as nanosisal composites. This research processed sisal fibers into nano size and mixed them with Bis-GMA, UDMA, TEGDMA, Champhorquinone (Sigma Aldrich). Nanofiller composite (Z350 XT, 3M, ESPE) was utilized as a control. The 20 samples utilized were divided into 4 groups (each group containing five samples): Group A contained nanosisal composite of 60% filler volume, group B, nanosisal composite of 65% filler volume, group C, nanosisal composite of 70% filler volume and group D, nanofiller composite (Z350 XT, 3M, ESPE). Samples were 2 mm in diameter and 6 mm in height. The sample was tested for compressive strength using a universal testing machine (UTM). Data was analyzed by means of a Kruskal Wallis procedure. Results: The mean of the compressive strength of the nanosisal composite 60% was 16.80 MPa; the nanosisal composite 65% was 10.80 MPa, the nanosisal composite 70% was 7.20 MPa and the nanofiller composite was 7.40 MPa. There was a significant difference in data analysis (p = 0.033; p < 0.05). Conclusion: In this study, the filler volume of nanosisal influenced the compressive strength of a composite resin and the nanosisal filler volume was recomended at 60%.

scholarly journals Time-dependent Variation in Compressive Strengths of Three Posterior Esthetic Restorative Materials: An in vitro Study

2016 ◽  
Vol 6 (3) ◽  
pp. 63-65
Author(s):  
Anjna Sharma ◽  
Pankaj Mishra
Keyword(s):  
Testing Machine ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Composite Resins ◽  
Time Dependent ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials

ABSTRACT Aim To compare the compressive strengths of composite resins and resin-modified glass ionomer cements (RMGICs) at different times. Materials and methods A total of 36 samples were prepared, 12 samples of each group, composite resins Filtek Z 250, Filtek Z 350, and resin-modified glass ionomer cement. Compressive strengths of specimens were measured after 1, 24 hours, and 7 days. Test was carried out on a “Universal Testing Machine” with cross-head speed of 5 mm/min. Results There was a significant difference between all the three restorative materials. Analysis of variance showed that mean compressive strengths of Z 250 after 1, 24 hours were higher than Z 350 and RMGIC (p < 0.05). The mean compressive strengths were reduced after 7 days in all the three groups, but after 7 days, the values of Z 250 when compared with the Z 350 and RMGIC were higher. Conclusion The study demonstrated that compressive strengths of hybrid composite resins (Z 250) were significantly higher than that of nanocomposites (Z 350) and RMGIC. How to cite this article Sharma A, Mishra P, Mishra SK. Time-dependent Variation in Compressive Strengths of Three Posterior Esthetic Restorative Materials: An in vitro Study. Int J Prosthodont Restor Dent 2016;6(3):63-65.

scholarly journals Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins

2013 ◽  
Vol 14 (6) ◽  
pp. 1137-1144 ◽  
Author(s):  
Hideaki Kyoizumi ◽  
Junji Yamada ◽  
Toshimitsu Suzuki ◽  
Masafumi Kanehira ◽  
Werner J Finger ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Minor Effect ◽  
Wear Depth ◽  
Glass Fillers ◽  
Glass Filler ◽  
Representative Samples

ABSTRACT Aim To investigate and compare the effects of toothbrushes with different hardness on abrasion and surface roughness of composite resins. Materials and methods Toothbrushes (DENT. EX Slimhead II 33, Lion Dental Products Co. Ltd., Tokyo, Japan) marked as soft, medium and hard, were used to brush 10 beam-shaped specimens of each of three composites resins (Venus [VEN], Venus Diamond [VED] and Venus Pearl [VEP]; HeraeusKulzer) with standardized calcium carbonate slurry in a multistation testing machine (2N load, 60 Hz). After each of five cycles with 10k brushing strokes the wear depth and surface roughness of the specimens were determined. After completion of 50k strokes representative samples were inspected by SEM. Data were treated with ANOVA and regression analyses (p < 0.05). Results Abrasion of the composite resins increased linearly with increasing number of brushing cycles (r2 > 0.9). Highest wear was recorded for VEN, lowest for VED. Hard brushes produced significantly higher wear on VEN and VEP, whereas no difference in wear by toothbrush type was detected for VED. Significantly highest surface roughness was found on VED specimens (Ra > 1.5 μm), the lowest one on VEN (Ra < 0.3 μm). VEN specimens showed increased numbers of pinhole defects when brushed with hard toothbrushes, surfaces of VEP were uniformly abraded without level differences between the prepolymerized fillers and the glass filler-loaded matrix, VED showed large glass fillers protruding over the main filler-loaded matrix portion under each condition. Conclusion Abrasion and surface roughness of composite resins produced by toothbrushing with dentifrice depend mainly on the type of restorative resin. Hardness grades of toothbrushes have minor effects only on abrasion and surface roughness of composite resins. No relationship was found between abrasion and surface roughness. Clinical significance The grade of the toothbrush used has minor effect on wear, texture and roughness of the composite resin. How to cite this article Kyoizumi H, Yamada J, Suzuki T, Kanehira M, Finger WJ, Sasaki K. Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins. J Contemp Dent Pract 2013;14(6):1137-1144.

scholarly journals A Preliminary Research Study on the Cytotoxicity of Expired and Non-expired Composite Resins: In Vitro Study

2020 ◽  
pp. 227-238
Author(s):  
Magrur Kazak DDS, PhD ◽  
Nazmiye Donmez DDS, PhD ◽  
Fatemeh Bahadori PhD ◽  
Vildan Betul Yenigun PhD ◽  
Abdurrahim Kocyigit MD, PhD
Keyword(s):  
Cell Viability ◽  
Composite Resin ◽  
In Vitro Study ◽  
Negative Control Group ◽  
Negative Control ◽  
Composite Resins ◽  
Control Group ◽  
Significant Difference ◽  
Preliminary Research

Objective: Studies have focused on use of non-expired composites. Unfortunately some clinicians still use expired composite resins without considering their effects. The objective of this in vitro preliminary research was to investigate cytotoxicity of expired(6-months) and non-expired composite resins. Materials and methods: Expired (E) and non-expired (NE) samples of one bulk-fill (Tetric N-Ceram Bulk-fill [TNB], Ivoclar Vivadent), two nano-hybrid (Tetric N-Ceram [TN], Ivoclar Vivadent; Clearfil Majesty ES-2 [CM], Kuraray) composite resins were tested on L929 fibroblast cells. Medium covering cells was removed then plastic rings (2-mm height) were filled with non-polymerized composite resins, placed in direct contact with cells and polymerized with LED light curing unit (LCU). Three samples were prepared for each group. After polymerization, removed medium was added to the cells. Cells that were left without medium (WOM) and cells that were exposed to LCU were used as positive control groups. Cells without any treatment were used as negative control group (C). Cells were incubated with tested materials for 7-days to evaluate cytotoxicity. Cell viability was calculated by sulforhodamine B test as a percentage (%). One-way ANOVA and post-hoc Tukey tests were used for statistical analyses (p<0.05). Results: Comparison between E and NE groups of same composite resins did not result in statistically significant differences (p>0.05), except between TN NE and TN E (p<0.05). TN E group was significantly more cytotoxic than TN NE group. When NE composite resin groups were compared to each other, statistically significant difference was only obtained between TNB NE and TN NE (p<0.05). Among all tested groups, TN NE group showed the least cytotoxic profile. No statistically significant differences were determined when E composite resin groups were compared to each other (p>0.05). All experimental groups compared with C group showed statistically significant cytotoxicity (p<0.05). A statistically significant difference existed between LCU and C groups (p<0.05). Conclusions: In clinical practice, expired composite resins should never be used. Although a correlation was found between expiration dates of nano-hybrid composite resins and cell viability, opposite data were obtained for bulk-fill composite resin. Researches are still required to evaluate biocompatibility of bulk-fill composite resins at various thicknesses with current LCUs.

scholarly journals Pengaruh Penyinaran Qth Dan Led Pada Kekuatan Tekan Resin Komposit Bulkfilldengan Berbagai Ketebalan

2017 ◽  
Vol 6 (1) ◽  
pp. 7
Author(s):  
Atia Nurul Sidiqa ◽  
Badi Soerachman
Keyword(s):  
Compressive Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Standard Procedure ◽  
Testing Machine ◽  
Polymerization Process ◽  
Light Emitting ◽  
Significant Difference ◽  
Qth Light ◽  
Thickness Variations

The incremental layering technique with a 2mm maximum depth is a standard procedure to produce a perfect resin composite with a high mechanical strength. Recent studies has developed bulkfill composite resin that can be done to a depth of more than 4mm. Composite resin polymerization process through irradiation can be obtained by the use of Quartz-Tungsten-Halogen (QTH) and Light Emitting Diodes (LED). One of the mechanical properties needed for the restorative material is good compressive strength to withstand a load of chewing time during the process of mastication function. The purpose of this study to determine the effect of irradiation QTH and LED on the compressive strength of composite resin bulkfill with thickness variations of 4 and 6mm. Teflon mold were used to prepare the resin bulkfill spesimen (6mm in diameter x 4mm in length) bulkfill disk 6mm diameter with a thickness of 4mm (n=5) and 6mm (n=5). Samples were soaked in distilled water with a temperature of 37ºC for 24 hours and then do the pressure test measurements by using Universal Testing Machine (UTM) with 250kgf load and speed of 0.5 mm/min. Shapiro-Wilk normality test and unpaired t-test used in this study.The results of the study there is no influence thickness was statistically significant (a=0.05) in the composite resin bulkfill thickness of 4mm and 6mm in LED and QTH irradiation group with a value of compressive strength 4mm group (147.82 ± 24,35MPa) and sample 6mm (133.76±30.63 MPa), QTH light source sample 4mm (158,21 ± 18,61Mpa), 6mm (154,23±21,43Mpa). LED and QTH no significant difference (p>0.05) in a thickness of 4mm and 6mm. Conclusion, bulkfill composite resin can be applied to the LED and QTH to a depth of 6mm without effecting the bulkfill compressive strength.

scholarly journals Bond Strength Evaluation of Bulk- fill Composites to Dentin Under Different Surface Treatments

2020 ◽  
pp. 194-207
Author(s):  
Kazım Bas ◽  
Ebru Uslu Cender
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Surface Preparation ◽  
Acid Group ◽  
High Viscosity ◽  
Composite Resins ◽  
Control Group ◽  
Significant Difference

Purpose: The aim of this study is to compare the shear bond strength of three high-viscosity bulk-fill composite resins applied as single layers of 4mm thickness and of one microhybrid composite resin applied incrementally with a thickness of 2mm on dentin surfaces prepared with different surface preparation methods. Materials and Methods: A total of 132 caries-free human molars whose dentines had been exposed were used. Three groups, each containing 44 teeth, were formed. The acid group was etched with 32% phosphoric acid; laser group was etched with Er, Cr; YSGG laser and the control group was prepared with silicon carbid paper. Following the application of bonding agent, composite resin materials were applied on teeth using teflon moulds of 4x4mm. The samples were then subjected to shear bond strength tests. Two-way variance analysis and Tukey HSD multiple comparison test were applied on collected data. Results: There was a significant difference between surface treatment methods used regarding shear bond strength (P<0.001). The highest shear bond strength values were detected in the “Acid” group while the lowest shear bond strength values were detected in the “control” group. On the other hand, there was no statistically significant difference among composite resins (P>0.05). Conclusions: Laser etching of the dentin tissues is not as effective as acid etching. Bulk-fill composites had similar effects compared with conventional composite resins with regard to bonding strength. More in vitro studies supported with clinical data are required to investigate the performance of bulk-fill composites and laser.

scholarly journals Tooth structure and fracture strength of cavities

2007 ◽  
Vol 18 (2) ◽  
pp. 134-138 ◽  
Author(s):  
José Mondelli ◽  
Fábio Sene ◽  
Renata Pereira Ramos ◽  
Ana Raquel Benetti
Keyword(s):  
Mass Loss ◽  
Fracture Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Cavity Preparation ◽  
Tooth Structure ◽  
Universal Testing ◽  
Significant Difference ◽  
Before And After

This study evaluated, in vitro, the loss of tooth substance after cavity preparation for direct and indirect restorations and its relationship with fracture strength of the prepared teeth. Sixty sound human maxillary first premolars were assigned to 6 groups (n=10). MOD direct composite cavities (Groups I, II and III) and indirect inlay cavities (Groups IV, V and VI) were prepared maintaining standardized dimensions: 2-mm deep pulpal floors, 1.5-mm wide gingival walls and 2-mm high axial walls. Buccolingual width of the occlusal box was established at 1/4 (Groups I and IV), 1/3 (Groups II and V) or 1/2 (Groups III and VI) of the intercuspal distance. Teeth were weighed (digital balance accurate to 0.001 g) before and after preparation to record tooth substance mass lost during cavity preparation. The prepared teeth were submitted to occlusal loading to determine their fracture strength using a universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed by two-way ANOVA and Tukey test (alpha= 0.05). 1/4-inlay cavities had higher percent mean mass loss (9.71%) than composite resin cavities with the same width (7.07%). 1/3-inlay preparations also produced higher percent mean mass loss (13.91%) than composite resin preparations with the same width (10.02%). 1/2-inlay cavities had 21.34% of mass loss versus 16.19% for the 1/2-composite resin cavities. Fracture strength means (in kgf) were: GI = 187.65; GII = 143.62; GIII = 74.10; GIV = 164.22; GV = 101.92; GVI = 50.35. Statistically significant difference (p<0.05) were observed between Groups I and IV, II and V, III and VI. Higher tooth structure loss and lower fracture strength were recorded after preparation of inlay cavities, regardless of the width of the occlusal box, compared to the direct composite resin cavities.

Evaluation of Compressive Strength of Repaired Direct Composite Resin Restorations

2017 ◽  
Vol 68 (8) ◽  
pp. 1874-1878
Author(s):  
Sorin Andrian ◽  
Galina Pancu ◽  
Claudiu Topoliceanu ◽  
Nicoleta Tofan ◽  
Simona Stoleriu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Hybrid Composite ◽  
Intermediate Layer ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Bonding Agent ◽  
Etch And Rinse ◽  
Composite Resin Restorations ◽  
Aged Composite

The aim of the study was to evaluate and to compare the compressive parameters of repaired composite restoration when using different types of composite resins and a universal bonding agent as an intermediate layer. Aged micro-filled hybrid and nano-filled hybrid composite resins were chosen to simulate old restoration. The same micro-filled hybrid composite resin was used as a repair material. A universal bonding agent applied in etch-and-rinse and self etch strategies was used as an intermediate layer in restoration repair. Non-aged composite resins were considered as control. Compressive strength and compressive modulus were determined by evaluating the samples in a universal testing machine. Lower values of the tested parameters were recorded after aging both types of composite resin when compared to control. Higher values of compressive strength were recorded when nano-filled hybrid composite resin was repaired when compared to micro-filled hybrid composite resin. The strategy of universal bonding agent application as an intermediate layer did not influenced the compressive properties of repaired restoration.

Comparative Evaluation of Solubilities of Two Nanohybrid Composite Resins in Saliva Substitute and Distilled Water: An in vitro Study

2017 ◽  
Vol 7 (2) ◽  
pp. 82-85 ◽  
Author(s):  
Pranjal S Walzade ◽  
Sumanthini MV ◽  
Vanitha U Shenoy ◽  
Rohini P Mahajan
Keyword(s):  
Comparative Evaluation ◽  
Composite Resin ◽  
Composite Resins ◽  
Long Term Results ◽  
P Value ◽  
Distilled Water ◽  
Saliva Substitute ◽  
Significant Difference ◽  
Nanohybrid Composite

ABSTRACT Aim of the study To determine the solubility of nanohybrid (NH) composite resins when immersed in saliva substitute and distilled water. Materials and methods A total of 60 disc-shaped samples (n = 30) were prepared in teflon molds of diameter 10 mm × 2 mm thickness from two NH composite resins. They were light-cured following which the samples were removed and weighed three times using a digital balance. Samples were then immersed in test solutions, i.e., 100 mL of distilled water and saliva substitute each stored for 24 hours and 7, 14, 21, and 28 days in an incubator at 37°C at 100% humidity. At the time intervals mentioned, the samples were removed from the incubator, washed with distilled water, blotted dry, and weighed. Samples were again immersed in fresh test solutions. Difference in preweight and postweight of samples was calculated and data were analyzed using appropriate test by testing normality. A p-value < 0.05 was considered to be significant. Results The results were analyzed using one-way analysis of variance (ANOVA). As observed from the baseline weight to the 28th day weight, there was a loss of weight of the samples in all the groups except NH composite resin (Flash) in distilled water. Conclusion From the results of the study, it was observed that there was no statistically significant difference in weight, with respect to the solubility of the two NH composite resins and the two solutions tested. Clinical significance of the study is that the NH composite resin that shows lesser solubility can be the choice for an esthetic restorative material in patients for long-term results. How to cite this article Mahajan RP, Shenoy VU, Sumanthini MV, Walzade PS. Comparative Evaluation of Solubilities of Two Nanohybrid Composite Resins in Saliva Substitute and Distilled Water: An in vitro Study. J Contemp Dent 2017;7(2):82-85.

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