scholarly journals EFFECT OF SALBUTAMOL SULFAT EXPOSURE TO THE SURFACE ROUGHNESS OF BIOACTIVE RESIN

2021 ◽  
Vol 6 (1) ◽  
pp. 44
Author(s):  
Dewi Puspitasari ◽  
Diana Wibowo
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Control Design ◽  
Composite Resins ◽  
Control Group ◽  
Exposure Group ◽  
Salbutamol Sulfate ◽  
Treatment Groups ◽  
Post Test

ABSTRACTBioactive composite resin is the newest restorative resin material which has good mechanical and aesthetic properties. In the oral cavity, the restoration is degraded due to exposure to acids, one of which is exposure to asthma drugs. Properties of composite resins that can be affected by degradation include surface roughness. This study aims to analyze salbutamol sulfate exposure to the surface roughness of bioactive resins. The research method used was pure experimental design with post test-only with control design. The study used 39 specimens of bioactive resin (8 mm in diameter and 2 mm in thickness), divided into 3 treatment groups, namely the 400µg salbutamol sulfate exposure group, the 800µg salbutamol sulfate exposure group and the artificial saliva control group with treatment every 24 hours for 7 days, subsequently the specimens are tested with the surface roughness of the composite resin using a surface roughness tester. The highest surface roughness value was found in the 800µg group (8.23 ± 0.98 µm), followed by 400 µg group (5.43 ± 1.16 µm) and the lowest in the artificial saliva group (2.63 ± 0.82 µm). There were significant differences in all treatment groups. The exposure of salbutamol sulfate affects the surface roughness of the bioactive composite resin, a higher number of exposure doses indicates a higher surface roughness value.Keywords: bioactive composite resins, salbutamol sulfate, surface roughness

scholarly journals Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

2017 ◽  
Vol 8 (3) ◽  
pp. 196-201 ◽  
Author(s):  
K Pradeep
Keyword(s):  
Surface Roughness ◽  
Physical Properties ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Composite Resins ◽  
Control Group ◽  
Hardness Tester ◽  
Crucial Effect ◽  
Restorative Materials ◽  
The Mean

ABSTRACT Aim The aim was to compare the effect of 10 and 20% carbamide peroxide (CP) on microhardness (MHN) and surface roughness of two commercially available bulk fill composites (X-tra fill Bulk Fill and Tetric EvoCeram Bulk Fill). Materials and methods A total of 50 specimens with both type composites were prepared using brass molds of inner diameter 10 mm and a height of 4 mm. Each type of composite was further divided into three groups, control group stored in artificial saliva for 14 days, other groups bleached with 10 and 20% CP respectively, for 14 days. Microhardness of the composite resin was tested with a Vickers hardness tester, whereas surface roughness was tested with profilometer. Results All the analysis was performed using Statistical Package for the Social Sciences version 18. The value of p < 0.05 was considered statistically significant. Both 10 and 20% CP significantly reduced MHN of experimental composite resins. However, the mean surface roughness was significantly higher in X-tra fill Bulk Fill than Tetric EvoCeram Bulk Fill at 20% CP concentration. The mean MHN of Tetric EvoCeram was reduced when compared with X-tra fill at 20% CP. Conclusion There was a significant reduction in the MHN of restorative materials observed after exposure to CP under a clinically simulated bleaching regimen. However, increase in surface roughness was seen only at 20% CP. Clinical significance The physical properties, such as MHN and surface roughness have a crucial effect on the longevity of restorations and, moreover, on the esthetic demands of patients, but they may be compromised by bleaching treatments. The aim of this research paper was to assess the reaction of home bleaching agents on the physical properties of two Bulk Fill composite resin restorative materials. How to cite this article Francis G, Pradeep K, Ginjupalli K, Saraswathi V. Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites. World J Dent 2017;8(3):196-201.

scholarly journals Surface roughness comparison of methacrylate and silorane-based composite resins after 40% hydrogen peroxide application

2012 ◽  
Vol 24 (1) ◽  
Author(s):  
Rori Sasmita ◽  
Rahmi Alma Farah Adang ◽  
Opik Taofik Hidayat
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Composite Resins ◽  
Tooth Bleaching ◽  
Control Group ◽  
Average Value ◽  
Quasi Experimental ◽  
Tooth Colour

The change of the tooth colour could be restored with bleaching. The tooth bleaching will affects the surface roughness of the composite resins. Recently, the material basis for composite resins has developed, among others are methacrylate-based and silorane based composite resins. The objective of this study was to distinguish the surface roughness value of methacrylate-based composite resin and silorane based composite resins. This research was quasi-experimental. The sample used in this study were methacrylate and silorane based composite resins in discs form, with the size of 6 mm and the thickness of 3 mm, manufactured into 20 specimens and divided into 2 groups. The control group was immersed in the artificial saliva, and the treatment group was applied with 40% hydrogen peroxide. The result of the experiment analyzed using unpaired sample t-test showed significant differences in the average value of the surface roughness after the application of 40% hydrogen peroxide. The average value of methacrylate and silorane based composite resins were 2.744 μm and 3.417 μm, respectively. There was a difference in the surface roughness of methacrylate and silorane based composite resin compounds after the application of 40% hydrogen peroxide. The surface roughness value of the silorane-based composite resin was higher than the methacrylate-based.

scholarly journals Does the temperature of beverages affect the surface roughness, hardness, and color stability of a composite resin?

2013 ◽  
Vol 07 (02) ◽  
pp. 165-171 ◽  
Author(s):  
Duygu Tuncer ◽  
Emel Karaman ◽  
Esra Firat
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Color Change ◽  
Artificial Saliva ◽  
Color Stability ◽  
The Other ◽  
Control Group ◽  
Baseline Values ◽  
Hardness Values ◽  
Properties Of Composites

ABSTRACT Objective: To investigate the effect of beverages′ temperature on the surface roughness, hardness, and color stability of a composite resin. Materials and Methods: Fifty specimens of the Filtek Z250 composite (3M ESPE, Dental Products, St.Paul, MN, USA) were prepared and initial roughness, microhardness, and color were measured. Then the specimens were randomly divided into five groups of 10 specimens each: Coffee at 70°C, coffee at 37°C, cola at 10°C, cola at 37°C, and artificial saliva (control). After the samples were subjected to 15 min × 3 cycles per day of exposure to the solutions for 30 days, the final measurements were recorded. Results: After immersion in beverages, the artificial saliva group showed hardness values higher than those of the other groups (P < 0.001) and the microhardness values were significantly different from the initial values in all groups except for the control group. Both cola groups showed roughness values higher than the baseline values (P < 0.05), while the other groups showed values similar to the baseline measurements. When ΔE measurements were examined, the 70°C coffee group showed the highest color change among all the groups (P < 0.05). Conclusion: High-temperature solutions caused alterations in certain properties of composites, such as increased color change, although they did not affect the hardness or roughness of the composite resin material tested.

scholarly journals Pengaruh kopi arabika terhadap perubahan warna resin komposit hybrid

e-GIGI ◽  
2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Style V. Sirang ◽  
P. S. Anindita ◽  
. Juliatri
Keyword(s):  
Hybrid Composite ◽  
Composite Resin ◽  
Composite Resins ◽  
Control Group ◽  
Control Group Design ◽  
Arabica Coffee ◽  
Group Design ◽  
Hybrid Type ◽  
Post Test ◽  
One Way Anova

Abstract: Composite resin is one of the restorations used in the field of dentistry due to its good esthetic property. To date, the most commonly used composite resin is the hybrid type. Its weakness is the nature of fluid absorbance that can change its color. This discoloration can caused inter alia by food and beverage consumption. Arabica coffee is mostly consumed by our society, however, it has deposit of chlorogenic acid that might cause discoloration. This study was aimed to assess the influence of arabica coffee to the discoloration of hybrid composite resins. This was a true experimental study with a pre test and post test only control group design. Total samples were 24 composite resins of hybrid type (diameter 5 mm and height 2 mm). Each treatment group consisted of 6 samples. The samples were divided into 4 treatment groups, as follows: 0 day, 3 days, 5 days, and 7 days of immersion in arabica coffee solution. The one-way anova test showed that the influence of arabica coffee solution to discoloration of composite resins was significant (p=0.00). Conclusion: There was a significant influence of the duration of immersion in arabica coffee to discoloration of hybrid composite resinsKeywords: resin composite, discoloration, arabica coffee Abstrak: Resin komposit merupakan salah satu bahan restorasi yang sering digunakan di bidang kedokteran gigi karena memiliki nilai estetik yang baik. Saat ini jenis resin komposit yang sering digunakan yaitu resin komposit tipe hybrid. Resin komposit memiliki kekurangan yaitu sifat absorbansi cairan yang dapat menyebabkan perubahan warna. Salah satu penyebab perubahan warna yaitu makanan dan minuman. Kopi arabika merupakan minuman yang sering dikonsumsi oleh masyarakat dan memiliki kandungan asam klorogenik yang dapat memengaruhi perubahan warna. Penelitian ini bertujuan untuk mengetahui pengaruh kopi arabika terhadap perubahan warna resin komposit hybrid. Jenis penelitian ialaj eksperimental murni dengan pre test dan post test only control group design. Jumlah sampel penelitian yaitu 24 resin komposit tipe hybrid dengan ukuran diameter 5 mm dan tinggi 2 mm, dibagi dalam tiga kelompok. Masing-masing kelompok perlakuan terdiri dari 6 sampel. Sampel dibagi menjadi 4 kelompok yaitu kelompok perlakuan 0 hari, 3 hari, 5 hari, dan 7 hari perendaman dalam larutan kopi arabika. Hasil analisis data dengan uji one way Anova menunjukkan adanya pengaruh kopi arabika terhadap perubahan warna resin komposit (p=0,00). Simpulan: Terdapat pengaruh bermakna dari lama perendaman dalam kopi arabika terhadap perubahan warna resin komposit hybrid. Kata kunci : resin komposit, perubahan warna, kopi arabika

scholarly journals Efek perendaman rebusan Daun Sirih Merah (Piper crocatum) terhadap kekerasan permukaan resin komposit

2016 ◽  
Vol 2 (2) ◽  
pp. 60
Author(s):  
Devi Puspita Handayani ◽  
Dewi Puspitasari ◽  
Nurdiana Dewi
Keyword(s):  
Composite Resin ◽  
Surface Hardness ◽  
Control Group ◽  
Mouth Rinse ◽  
Control Group Design ◽  
Treatment Groups ◽  
Betel Leaf ◽  
Post Test ◽  
Post Hoc ◽  
One Way Anova

The effect of immersion of decoction water of Red Betel Leaf (Piper crocatum) on the surface hardness of composite resin. The purpose of this study was to determine the effect of immersion of decoction water of red betel leaf on the surface hardness of composite resin compared to alcoholic mouth rinse. It was a pure experimental study with post-test only with control group design. The total samples were 27 samples divided into 2 treatment groups and 1 control group, each of which consisted of 9 samples. The treatment groups were immersed in the decoction water of red betel leaf and alcoholic mouth rinse. The control group was immersed in aquadest. After the immersion, the samples were measured using Vickers Micro hardness Tester. Analysis with one way anova and post hoc Bonferroni showed a significant difference (p<0.05) on the surface hardness of composite resin after being immersed in decoction water of red betel leaf(79,81±3,76) kg/mm2 and alcoholic mouth rinse (67,11±2,51) kg/mm2. Based on this research, it can be concluded that there was an effect of immersion of decoction water of red betel leaf if compared with alcoholic mouth rinse. The value of surface hardness of composite resin immersed in alcoholic mouth rinse was lower than the decoction water of red betel leaf.ABSTRAKPenelitian ini bertujuan untuk mengetahui efek perendaman dalam rebusan daun sirih merah terhadap kekerasan permukaan resin komposit bila dibandingkan dengan obat kumur beralkohol. Penelitian ini merupakan penelitian eksperimental murni dengan post-test only with control group design. Jumlah sampel sebanyak 27 yang dibagi dalam 2 kelompok perlakuan dan 1 kelompok kontrol dengan masing-masing kelompok sebanyak 9 sampel. Kelompok perlakuan direndam dengan air rebusan daun sirih merah dan obat kumur beralkohol. Kelompok kontrol direndam dengan akuades steril. Setelah itu dilakukan pengukuran menggunakan Vickers Microhardness Tester. Hasil uji One Way Anova dan Post Hoc Bonferroni menunjukkan bahwa terdapat perbedaan bermakna nilai kekerasan permukaan resin komposit yang direndam dengan air rebusan daun sirih merah (79,81±3,76) kg/mm2 dan obat kumur beralkohol (67,11±2,51) kg/mm2 dengan nilai kemaknaan (p<0,05). Berdasarkan penelitian yang dilakukan dapat diambil kesimpulan bahwa terdapat efek lebih rendah pada perendaman dalam rebusan daun sirih merah terhadap kekerasan permukaan resin komposit bila dibandingkan dengan obat kumur beralkohol. Nilai kekerasan permukaan resin komposit yang direndam obat kumur beralkohol lebih rendah dibandingkan air rebusan daun sirih merah.

The Effect of Finishing and Polishing Procedures on the Surface Roughness of Composite Resin Materials

2007 ◽  
Vol 8 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Nuray Attar
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Resin Composite ◽  
Composite Resins ◽  
Control Group ◽  
Surface Groups ◽  
Average Roughness ◽  
Strip Surface ◽  
Polishing Procedures ◽  
Surface Sealant

Abstract Aims The aims of this study were to evaluate the effect of various finishing and polishing procedures on the surface roughness of six different composite resin materials (Artemis Enamel, TPH Spectrum, Filtek A–110, Filtek Supreme Enamel, Solitaire 2, and Filtek P–60) as well as to evaluate the effectiveness of the surface sealant application (BisCover) on the surface roughness after finishing and polishing procedures of tested composites. Methods and Materials Specimens (n=168) measuring 5 mm in diameter x 2 mm in thickness were fabricated in a plexiglass well covered with a Mylar strip using six composite resins. A control group of seven specimens of each material received no polishing after being cured under the Mylar strip. Twenty-one specimens for each composite were randomly divided among three finishing and polishing groups (n=7). Each group was polished using a different system: Carbide bur/Sof-Lex disc, Carbide bur/Enhance disc with polishing paste, and Carbide bur/Edenta composite finishing kit. The average surface roughness (Ra, ìm) of the control and treated specimens were measured with the Mitutoyo Surftest–402 Surface Roughness tester. After a surface sealant (BisCover) was applied to all treated specimens, according to manufacturer's instructions, the average roughness (Ra) was measured again. Results were statistically analyzed using analysis of variance (ANOVA) and the post-hoc Scheffe's test at a p<0.05 significance level. Results Significant differences were found for the surface roughness (p<0.05) with interaction among composite resins and the finishing systems used (p<0.05). Enhance/Biscover finishing and polishing procedure surface was not significantly different from the Mylar strip surface groups (p>0.05). The Mylar strip group was not significantly different from the Sof-Lex/BisCover and Edenta/BisCover groups. The ranking of mean Ra values by materials was as follows: Filtek Supreme Enamel < Filtek A110 < TPH Spectrum < Artemis <Filtek P–60 < Solitaire 2. The ranking of mean Ra values by polishing systems was as follows: Enhance/BisCover < Mylar Strip < Sof-Lex/BisCover < Edenta/BisCover < Sof-Lex < Enhance < Edenta. Conclusion Smoother surfaces were recorded for the Enhance/BisCover and the Mylar strip-formed surface groups. The composite finishing kit Edenta significantly increased the Ra for all tested composites (p<0.05). But after finishing with Edenta, the use of a surface sealant (BisCover) significantly improved the surface smoothness of all tested composites (p<0.05). Use of BisCover surface sealant on anterior and posterior resin composite restorations after finishing and polishing procedures is recommended. Citation Attar N. The Effect of Finishing and Polishing Procedures on the Surface Roughness of Composite Resin Materials. J Contemp Dent Pract 2007 January;(8)1:027-035.

scholarly journals Pengaruh Perendaman Kopi Robusta dan Arabika terhadap Kekerasan Resin Komposit Nanofiller

e-GIGI ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Fransiska M. Pardosi ◽  
Darmawati A. Indraswari ◽  
Lusiana Batubara ◽  
Nadia Hardini
Keyword(s):  
Composite Resin ◽  
Artificial Saliva ◽  
Control Group ◽  
Arabica Coffee ◽  
Treatment Groups ◽  
Hardness Tester ◽  
Robusta Coffee ◽  
Significant Difference ◽  
Post Hoc ◽  
One Way Anova

Abstract: Nanofiller composite resin has small filler size which enhances its properties. However, these properties could decrease due to several factors. Acidic liquid such as coffee could reduce the hardness of composite resin. This study was aimed to analyze the effect of robusta and arabica coffee immersion on the hardness of nanofiller composite resin. A total of 27 composite resin samples were used and then were polished by using a soflex disc for 30 seconds on each roughness level. Samples were then divided into three groups, as follows: the control group with artificial saliva and the treatment groups with robusta coffee and arabica coffee. The composite resin molds were immersed in the three groups for 5 days. After five days of immersion, the hardness of the sample was tested by using a Vickers hardness tester. Artificial saliva as the control group had the highest mean hardness value of 112.98±8.67 VHN, followed by robusta coffee, and then by arabica coffee. The One Way Anova and post hoc LSD test showed that there were significant differences in all groups (p<0.05) except for the two treatment groups, namely robusta and arabica coffee groups which did not show any significant difference in the resin hardness (p>0.05). In conclusion, robusta and arabica coffee affect the hardness of the nanofiller composite resin, but there is no significant difference in the hardness between the robusta and arabica coffee groups.Keywords: composite resin hardness, nanofiller, robusta coffee, arabica coffee Abstrak: Resin komposit nanofiller memiliki ukuran filler kecil yang dapat meningkatkan fungsinya namun fungsi tersebut dapat menurun oleh beberapa hal. Cairan asam yang dikonsumsi seperti kopi dapat menurunkan kekerasan resin komposit. Penelitian ini bertujuan untuk mengetahui pengaruh perendaman kopi robusta dan arabika terhadap kekerasan resin komposit nanofiller. Sampel resin komposit yang digunakan sebanyak 27 buah dan dilanjutkan dengan pemolesan menggunakan soflex disc selama 30 detik setiap tingkat kekasarannya. Sampel kemudian dibagi dalam tiga kelompok, yaitu kelompok kontrol dengan saliva buatan dan dua kelompok perlakuan dengan kopi robusta dan arabika. Sebanyak 27 buah resin komposit direndam ke dalam tiga kelompok tersebut selama lima hari kemudian diuji kekerasannya dengan vickers hardness tester. Saliva buatan sebagai kelompok kontrol memiliki nilai rerata kekerasan tertinggi sebesar 112,98±8,67 VHN, diikuti kopi robusta, dan nilai terendah yaitu kopi arabika. Hasil uji One Way Anova dan post hoc LSD menunjukkan terdapat perbedaan bermakna pada semua kelompok (p<0,05) kecuali pada kedua kelompok perlakuan yaitu antara kopi robusta dan arabika tidak menunjukkan adanya perbedaan kekerasan yang bermakna (p>0,05). Simpulan penelitian ini ialah kopi robusta dan arabika memengaruhi kekerasan resin komposit nanofiller namun tidak terdapat perbedaan kekerasan antara keduanya.Kata kunci: kekerasan resin komposit, nanofiller, kopi robusta, kopi arabika

scholarly journals Comparative Study Regarding the Surface Roughness of Highly Viscous Flowable Composites After Immersion in Acidic Drinks

2019 ◽  
Vol 70 (6) ◽  
pp. 2010-2014
Author(s):  
Irina Nica ◽  
Simona Stoleriu ◽  
Galina Pancu ◽  
Adriana Munteanu ◽  
Claudiu Topoliceanu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Statistical Tests ◽  
Composite Resins ◽  
Control Group ◽  
Mean Values ◽  
Group I ◽  
Kolmogorov Smirnov ◽  
Glass Plates ◽  
Post Hoc

The aim of the present study was to assess, by profilometry, the effect of different immersion regimes in Coca-Cola drink on the surface roughness of two highly viscous flowable composite resins. The studied materials were Gradia Direct LoFlo (GC Corporation,Tokyo, Japan) and Micro Esthetic flow-viscous (Bisico, Germany). Fifteen cylindrical samples having the of 5 mm and the thickness of 2 mm were made from each material using plastic molds placed on glass plates. The samples were light-cured for 40s on both sides through the glass plates, to ensure complete polymerization of the material. They were divided into two groups as follows: Group I. Gradia Direct LoFlo and Group II. Micro Esthetic flow-viscous. Specimens of each group were then randomly divided into 5 subgroups. In subgroup A (control group) 4 samples were kept only in artificial saliva. In subgroups B-E (each having 4 samples) the samples were immersed in Coca-Cola drink according to 4 different protocols. The mean values of roughness parameters, Ra, were calculated. The Kolmogorov-Smirnov normality test was used to determine the distribution of data in groups. ANOVA and Tukey post hoc statistical tests were used to compare the results from the groups. For both materials, the highest surface roughness was determined for the samples that were submerged 7 times/day in Coca Cola. The assessment of surface microstructure of the samples, after immersion, revealed for both materials a statistically significant increase of Ra values.

scholarly journals Surface Roughness of Composite Resins Subjected to Hydrochloric Acid

2015 ◽  
Vol 26 (3) ◽  
pp. 268-271 ◽  
Author(s):  
Ana Carolina Cabral Roque ◽  
Lauren Oliveira Lima Bohner ◽  
Ana Paula Terossi de Godoi ◽  
Vivian Colucci ◽  
Silmara Aparecida Milori Corona ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Hydrochloric Acid ◽  
Factorial Design ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Composite Resins ◽  
Tukey Test ◽  
Nanohybrid Composite ◽  
Roughness Measurements ◽  
Acid Challenge

The purpose of this study was to determine the influence of hydrochloric acid on surface roughness of composite resins subjected to brushing. Sixty samples measuring 2 mm thick x 6 mm diameter were prepared and used as experimental units. The study presented a 3x2 factorial design, in which the factors were composite resin (n=20), at 3 levels: microhybrid composite (Z100), nanofilled composite (FiltekTM Supreme), nanohybrid composite (Ice), and acid challenge (n=10) at 2 levels: absence and presence. Acid challenge was performed by immersion of specimens in hydrochloric acid (pH 1.2) for 1 min, 4 times per day for 7 days. The specimens not subjected to acid challenge were stored in 15 mL of artificial saliva at 37 oC. Afterwards, all specimens were submitted to abrasive challenge by a brushing cycle performed with a 200 g weight at a speed of 356 rpm, totaling 17.8 cycles. Surface roughness measurements (Ra) were performed and analyzed by ANOVA and Tukey test (p≤0.05). Surface roughness values were higher in the presence (1.07±0.24) as compared with the absence of hydrochloric acid (0.72±0.04). Surface roughness values were higher for microhybrid (1.01±0.27) compared with nanofilled (0.68 ±0.09) and nanohybrid (0.48±0.15) composites when the specimens were not subjects to acid challenge. In the presence of hydrochloric acid, microhybrid (1.26±0.28) and nanofilled (1.18±0,30) composites presents higher surface roughness values compared with nanohybrid (0.77±0.15). The hydrochloric acid affected the surface roughness of composite resin subjected to brushing.

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

2012 ◽  
Vol 37 (5) ◽  
pp. 526-531 ◽  
Author(s):  
CRG Torres ◽  
CF Ribeiro ◽  
E Bresciani ◽  
AB Borges
Keyword(s):  
Hydrogen Peroxide ◽  
Composite Resin ◽  
Color Change ◽  
Composite Resins ◽  
Control Group ◽  
Peroxide Bleaching ◽  
Color Changes ◽  
Tukey Test ◽  
Bleaching Gels ◽  
Bleaching Treatment

SUMMARY The aim of the present study was to evaluate the effect of 20% and 35% hydrogen peroxide bleaching gels on the color, opacity, and fluorescence of composite resins. Seven composite resin brands were tested and 30 specimens, 3-mm in diameter and 2-mm thick, of each material were fabricated, for a total of 210 specimens. The specimens of each tested material were divided into three subgroups (n=10) according to the bleaching therapy tested: 20% hydrogen peroxide gel, 35% hydroxide peroxide gel, and the control group. The baseline color, opacity, and fluorescence were assessed by spectrophotometry. Four 30-minute bleaching gel applications, two hours in total, were performed. The control group did not receive bleaching treatment and was stored in deionized water. Final assessments were performed, and data were analyzed by two-way analysis of variance and Tukey tests (p&lt;0.05). Color changes were significant for different tested bleaching therapies (p&lt;0.0001), with the greatest color change observed for 35% hydrogen peroxide gel. No difference in opacity was detected for all analyzed parameters. Fluorescence changes were influenced by composite resin brand (p&lt;0.0001) and bleaching therapy (p=0.0016) used. No significant differences in fluorescence between different bleaching gel concentrations were detected by Tukey test. The greatest fluorescence alteration was detected on the brand Z350. It was concluded that 35% hydrogen peroxide bleaching gel generated the greatest color change among all evaluated materials. No statistical opacity changes were detected for all tested variables, and significant fluorescence changes were dependent on the material and bleaching therapy, regardless of the gel concentration.

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