Evaluation and correlation of depth cure and degree of conversion of bulk-fill posterior restorative composite resins

2019 ◽  
Vol 2 (1) ◽  
pp. 01-04
Author(s):  
Ibrahim M. Hamouda ◽  
Majed A. Almalki
Keyword(s):  
Ftir Spectroscopy ◽  
Composite Resin ◽  
Dental Amalgam ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
The Other ◽  
Posterior Teeth ◽  
Depth Of Cure ◽  
Positive Correlation ◽  
Other Hand

Background: The problem of composite resin filling is the longer time consumed for incremental application. Bulk-fill composite resins were introduced to the market as substitutes for dental amalgam for restoration of posterior teeth. Objectives: The aim of this study was to evaluate the curing depth and degree of conversion of two bulk-fill composite resins. Materials and methods: . Specimens of specific dimensions were prepared from Glacier and SureFil (universal shade, A2), they classified as bulk-fill composite resins. Depth of cure, degree of conversion at different thicknesses for each material (2,3,4,5 and 6 mm) for each thickness separately. The curing depth was determined by the scrapping method (ISO 4049, 2000). The degree of conversion was measured by the Buker FTIR Spectroscopy. Results: The results indicated that, Glacier composite resin has greater curing depth than that of SureFil composite resin. Glacier composite resin was cured above 6 mm thickness, while SureFil composite resin was cured above 5 mm. In general, the degree of conversion was different at the different thicknesses of the materials. SureFil composite resin showed highest degree of conversion at 3 mm followed by 2 mm thickness, while the lowest degree of conversion was noted at 6 mm thickness. Glacier composite resin has the highest degree of conversion at 3 mm followed by 2 mm thickness, while the lowest degree of conversion was noted at 6 mm thickness. SureFil showed positive correlation between the depth of cure and the degree of conversion. Glacier composite resin showed no significant correlation between the depth of cure and degree of conversion. Conclusions: The studied bulk-fill composite resins, cured up to 5mm to 6mm thicknesses. 2 and 3mm thicknesses adequately polymerized than 4 mm, 5 mm and 6 mm thicknesses. The degree of conversion of 2 mm and 3 mm thicknesses was greater than that of the other thicknesses. There was positive correlation between the degree of conversion and curing depth of SureFil composite resin. On the other hand, Glacier composite resin showed no significant correlation between the depth of cure and degree of conversion.

scholarly journals Role of Composition to Degree of Conversion of Bulk Fill Composite Resins

2017 ◽  
Vol 6 (1) ◽  
pp. 33 ◽  
Author(s):  
Sefty Aryani Harahap ◽  
Yosi Kusuma Eriwati
Keyword(s):  
Composite Resin ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Resin Matrix ◽  
Double Bonds ◽  
Depth Of Cure ◽  
High Degree ◽  
Single Bonds

A recent technology of Bulk fill composite resin has been developed to save manipulation time. Bulk fill composite resinhas been claimed to have depth of cure up to 4 mm with a high degree of conversion. This paper will evaluate the role of bulk fill composite resin’s composition in increasingits degree of conversion. The degree of conversion is the percentage of carbon double bonds that were converted into single bonds as a result of polymerization. It is determined by its composition that contained filler, resin matrix and the photoinitiator. With the development and modifications of the composition, the bulk fill compositeresin  can be obtained a high degree of conversion so that the expected properties can be achieved.

The Sucrose-Natural Gypsum Makes the Compound Retarder to the Cement and the Concretes Performance Influence Experimental Study

2011 ◽  
Vol 335-336 ◽  
pp. 1219-1222
Author(s):  
Ru Qin Wang
Keyword(s):  
Experimental Study ◽  
Physical Properties ◽  
Experimental Research ◽  
Mixing Time ◽  
The Other ◽  
Positive Correlation ◽  
Other Hand ◽  
Cement And Concrete

By the experimental research to the effect sucrose-natural gypsum as composite retarder on the performance of cement and concrete. This paper analyzes and summarizes the fact that the influence of this kind of composite retarder is more obvious than the slow setting effect of a single sugar or plaster. And the retardation of cement and concrete the mixing time is basically the amount of sugar a positive correlation. And on the other hand, it will not influence other physical properties.

One-Year Clinical Evaluation of Composite Restorations in Posterior Teeth: Effect of Adhesive Systems

2012 ◽  
Vol 37 (6) ◽  
pp. E30-E37 ◽  
Author(s):  
RH Sundfeld ◽  
RS Scatolin ◽  
FG Oliveira ◽  
LS Machado ◽  
RS Alexandre ◽  
...  
Keyword(s):  
Composite Resin ◽  
Clinical Performance ◽  
Adhesive System ◽  
Composite Resins ◽  
Adhesive Systems ◽  
Posterior Teeth ◽  
Significance Level ◽  
Marginal Integrity ◽  
Composite Resin Restorations ◽  
One Year

SUMMARY This clinical study assessed the performance of posterior composite resins applied with the Adper™ Single Bond Plus (SB) and Adper™ Scotchbond SE (SE) adhesive systems and Filtek™ Supreme Plus composite resin, using modified US Public Health Service criteria. A total of 97 restorations were placed in posterior teeth by two calibrated operators. Application of the materials followed manufacturers' instructions. The restorations were evaluated by two examiners at baseline and after one year. Statistical analyses were conducted using the proportion test at a significance level of 5% (p<0.05). All the restorations evaluated (ie, 100%) received an alpha rating for the criteria of marginal discoloration and marginal integrity at baseline. At one year, for marginal discoloration, 64.6% of SB and 61.2% of SE received an alpha rating. For marginal integrity, 72.9% of SB and 77.6% of SE received an alpha rating. The other restorations received bravo ratings for both criteria. None of the teeth that received the restorative systems presented caries lesions around the restorations. A total of eight teeth presented postoperative sensitivity one week after baseline, five with SB and three with SE; the symptom had disappeared one year later. One year later, composite resin restorations using either adhesive system showed satisfactory clinical performance.

A Five-Year Clinical Evaluation of Direct Nanofilled and Indirect Composite Resin Restorations in Posterior Teeth

2013 ◽  
Vol 38 (2) ◽  
pp. E31-E41 ◽  
Author(s):  
AR Cetin ◽  
N Unlu ◽  
N Cobanoglu
Keyword(s):  
Composite Resin ◽  
Clinical Performance ◽  
United States Public Health ◽  
The United States ◽  
Composite Resins ◽  
Posterior Teeth ◽  
Indirect Composite ◽  
Composite Resin Restorations ◽  
Clinical Conditions ◽  
Resin Restorations

SUMMARY Aim: To assess the clinical efficacy of posterior composite resin restorations placed directly and indirectly in posterior teeth after five years. Materials and Methods: A total of 108 cavities in 54 patients were restored with three direct composite resins (Filtek SupremeXT [FSXT], Tetric Evo Ceram [TEC], AELITE Aesthetic [AA]) and two indirect composite resins (Estenia [E] and Tescera ATL [TATL]). All restorations were evaluated by two examiners using the United States Public Health Service criteria at baseline and five years after placement. Statistical analysis was completed with Fisher exact and McNemar χ2 tests. Results: At baseline, 4% (five) of the restored teeth presented postoperative sensitivity; however, only one of them (a member of the E group) required canal treatment and replacement after two years. At the five-year evaluation, all restorations were retained, with Alpha ratings at 100%. Only one tooth (in the TEC group) required replacement after three years due to secondary caries. Color match, surface texture, and marginal integrity were predominantly scored as Alpha after five years for all groups. After that time, marginal discoloration was scored as Alpha in 64% of AE restorations, 70% of TATL restorations, 73% of E restorations, and 87% of FSXT restorations. There were no Charlie scores recorded for any of the restorative systems. Conclusions: Under controlled clinical conditions, indirect composite resin inlays and direct composite resin restorations exhibited an annual failure rate of 2.5% and 1.6%, respectively, after five years. Therefore, the investigated materials showed acceptable clinical performance, and no significant differences were found among them.

Effect of Tooth-Whitening Procedures on Stained Composite Resins

2019 ◽  
Vol 44 (1) ◽  
pp. 65-75 ◽  
Author(s):  
JW Reinhardt ◽  
MM Balbierz ◽  
CM Schultz ◽  
B Simetich ◽  
MW Beatty
Keyword(s):  
Red Wine ◽  
Composite Resin ◽  
Color Change ◽  
Composite Resins ◽  
The Other ◽  
Time Interval ◽  
Distilled Water ◽  
Water Control ◽  
Tooth Whitening ◽  
Final Composite

SUMMARY In this laboratory study, a composite resin was stained to a visibly discernible level using both coffee and red wine over 14 days (change was considered clinically noticeable and significant when ΔEab*≥2.7). Color change was measured at one, three, seven, and 14 days of staining. Although the nature of color change was different for the two staining solutions, the overall degree of staining (ΔEab*) rendered by either coffee or wine at each time interval was not significantly different (p≥0.05). Four whitening protocols were applied to stained composites. Treatment included applications of distilled water (control), Crest Pro-Health [HD] toothpaste, Crest Whitestrips, Opalescence PF bleach (15%), and application of a fine pumice polishing (Preppies). HD toothpaste and Whitestrips were applied daily for 21 days, Opalescence was applied daily for 10 days, and polishing was applied once. Each of the whitening products, applied in a manner simulating at-home or in-office treatment, was effective in producing color improvements (lightening) over controls (p<0.05), but none of the four treatments produced lightening that was significantly different from the other treatments (p≥0.05). A comparison of final composite color with that measured at baseline showed that Opalescence returned composite color to an acceptable level following exposure to both staining solutions (ΔEab*<2.7), Whitestrips returned color close to baseline for wine-stained composites, and HD paste and polishing permitted residual stain to remain (ΔEab*≥2.7).

Influence of Different Cordless Light-emitting-diode Units and Battery Levels on Chemical, Mechanical, and Physical Properties of Composite Resin

2019 ◽  
Vol 45 (4) ◽  
pp. 377-386 ◽  
Author(s):  
IO Cardoso ◽  
AC Machado ◽  
DNR Teixeira ◽  
FC Basílio ◽  
A Marletta ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Physical Properties ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Pearson Correlation ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Light Emitting ◽  
Mechanical And Physical Properties ◽  
Diametral Tensile Strength

Clinical Relevance Irradiance may decrease as the light-emitting diode (LED) is discharged. Therefore, the LED must be charged carefully to prevent the possibility of influencing the chemical, mechanical, and physical properties of composite resin. SUMMARY The aim of this study was to evaluate the influence of different light-emitting diode (LED) curing units and battery levels on the chemical, mechanical, and physical properties of composite resins. The irradiance for each cycle from full to completely discharged battery level was evaluated, for five different new cordless LED units: Optilight Color (Gnatus), Bluephase (Ivoclar), Valo (Ultradent), Radii Plus (SDI), and Radii Xpert (SDI). After the irradiance evaluation, composite resin specimens were prepared and light cured, while varying the battery level for each LED unit: high level (HL, 100%), medium level (ML, 50%), and low level (LL, 10%). The degree of conversion, diametral tensile strength, sorption, and solubility were also evaluated. Data were checked for homoscedasticity and submitted to two-way and three-way analysis of variance, depending on the test performed, followed by the Tukey test with a significance level of 95%. A negative correlation was found between irradiance and cycles of light curing, which was checked by the Pearson correlation test. Valo and Radii Xpert were not influenced by the battery level in any test performed. However, different battery levels for some LED units can influence the degree of conversion, diametral tensile strength, sorption, and solubility of composite resins.

Effect of Different Ethephon Concentrations on Olive Fruits Harvesting at Different Orchard Locations

2014 ◽  
Vol 2 (1) ◽  
pp. 9-13
Author(s):  
Taleb Abu Zahra
Keyword(s):  
Block Design ◽  
The Other ◽  
Olive Cultivar ◽  
Olive Fruit ◽  
Positive Correlation ◽  
Other Hand ◽  
Leaf Drop

An experiment was conducted to determine the optimum ethephon concentration on olive fruit harvesting at different Jordan locations. The study was carried out on Nabali olive cultivar at “Irbid and Ajlon” locations. Treatments were consisted of five ethephon concentrations, which are: 0, 1000, 2000, 3000 and 4000 ppm, each concentration was repeated 4 times. 10 days after ethephon applications, data were collected and analyzed according to the randomized completely block design. Results revealed that all of the used ethephon concentrations promote leaf drop, which remains within the acceptable ranges in both locations. Although, ethephon dosage had significant effects on harvesting productivity at 0.05 levels; best results were obtained by using 3000 ppm concentration at Irbid location, while at Ajlon; best results were observed with treating the olive fruits with 4000 ppm ethephon concentration. On the other hand, positive correlation were observed between the percent of leaf drop and the total harvested fruits

Effect of Different Ethephon Concentrations on Olive Fruits Harvesting at Different Orchard Locations

2014 ◽  
Vol 2 (1) ◽  
pp. 9-13
Author(s):  
Taleb Abu Zahra
Keyword(s):  
Block Design ◽  
The Other ◽  
Olive Cultivar ◽  
Olive Fruit ◽  
Positive Correlation ◽  
Other Hand ◽  
Leaf Drop

An experiment was conducted to determine the optimum ethephon concentration on olive fruit harvesting at different Jordan locations. The study was carried out on Nabali olive cultivar at “Irbid and Ajlon” locations. Treatments were consisted of five ethephon concentrations, which are: 0, 1000, 2000, 3000 and 4000 ppm, each concentration was repeated 4 times. 10 days after ethephon applications, data were collected and analyzed according to the randomized completely block design. Results revealed that all of the used ethephon concentrations promote leaf drop, which remains within the acceptable ranges in both locations. Although, ethephon dosage had significant effects on harvesting productivity at 0.05 levels; best results were obtained by using 3000 ppm concentration at Irbid location, while at Ajlon; best results were observed with treating the olive fruits with 4000 ppm ethephon concentration. On the other hand, positive correlation were observed between the percent of leaf drop and the total harvested fruits

scholarly journals Usage of Fiber-Reinforced Resin Instruments in Interproximal Surfaces

2008 ◽  
Vol 02 (02) ◽  
pp. 096-101
Author(s):  
Deniz C. Can-Karabulut ◽  
Perihan Ozyurt ◽  
Ayhan Gurbuz ◽  
Abdulkadir Gullu
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Soft Tissues ◽  
Composite Resin ◽  
The Other ◽  
Fiber Reinforced ◽  
Surface Textures ◽  
Other Hand ◽  
Representative Samples ◽  
Sem Analyses

ABSTRACTObjectives: The aim of this study was to investigate the effects of fiber-reinforced resin burs on the surface roughness of a nanofilled composite.Methods: Average surface roughness values (Ra, �m) were measured using a surface profilometer and surface textures after finishing procedures were evaluated using a scanning electron microscope (SEM). Thirty cylindrical specimens were prepared using sectional teflon molds. A nanofilled composite was chosen. After the preparation specimens were divided into three subgroups randomly. After profilometric measurements, representative samples of the mentioned finishing procedures were selected and SEM analyses were carried out.Results: Mylar strip group was statistically different from the other two groups (P<.05). The smoothest surfaces occurred when composite resin samples were light cured against the strips. On the other hand there was no statistical difference between fiber-reinforced resin burs and Sof-Lex discs (P>.05). For fiber-reinforced resin burs scratches and pitting which may be due to plucking of the filler particles during finishing were observed on the surface topography of the composite resin material. On the other hand, for the Sof-Lex discs although scratches were noticed on the surface topography, no pitting was observed.Conclusions: Fiber-reinforced resin burs can be preferred for the grinding of composite surplus in interproximal surfaces, where the use of Sof-Lex discs can be harmful to soft tissues. (Eur J Dent 2008;2:96-101)

scholarly journals Influence of Battery Level of a Cordless LED Unit on the Properties of a Nanofilled Composite Resin

2016 ◽  
Vol 41 (4) ◽  
pp. 409-416 ◽  
Author(s):  
AG Pereira ◽  
LHA Raposo ◽  
DNR Teixeira ◽  
RCQ Gonzaga ◽  
IO Cardoso ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Light Intensity ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Pearson Correlation ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Battery Voltage ◽  
Significant Difference ◽  
Diametral Tensile Strength

SUMMARY The properties of composite resins can be influenced by light activation, depending primarily on the performance of the curing unit. The aim of this study was to evaluate how different battery levels of a cordless light-emitting diode (LED) unit influence the properties of a nanofilled composite resin. First, the battery voltage and light intensity of the cordless LED unit were individually checked for all light-curing cycles. Then, composite resin discs were prepared and light-cured at different battery levels: high level (HL, 100%), medium level (ML, 50%), and low level (LL, 10%). The degree of conversion, diametral tensile strength, sorption, and solubility of the specimens were tested. Data were checked for homoscedasticity and submitted to one-way analysis of variance followed by Tukey honestly significant difference and Pearson correlation tests (p&lt;0.05). The battery voltage and light intensity varied significantly among the groups (p&lt;0.001). The LL group presented a lower degree of conversion than the HL and ML groups (p&lt;0.001), which shower similar results (p=0.182). Lower diametral tensile strength was also verified for the LL group when compared with the HL and ML groups (p&lt;0.001), which presented no difference (p=0.052). Positive correlation was observed between the light intensity and the parameters studied, with the exception of sorption and solubility (p&lt;0.001). The ML and LL groups showed higher sorption than the HL group (p &lt;0.001), but no difference was verified between the first two groups (p=0.535). No significant differences were found for solubility between the ML and LL groups (p=0.104), but the HL group presented lower values (p&lt;0.001). The different battery levels of the cordless LED curing unit influenced all the properties of the nanofilled composite resin evaluated.

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