scholarly journals Influence of light source and immersion media in surface roughness and hardness of a nanofilled composite resin

2013 ◽  
Vol 1 (2) ◽  
pp. 165
Author(s):  
Patrícia Aleixo dos Santos Domingos ◽  
Patrícia Petromilli Nordi Sasso Garcia ◽  
Ana Luisa Botta Martins Oliveira ◽  
Juliana Álvares Duarte Bonini Campos ◽  
Regina Guenka Palma Dibb
Keyword(s):  
Surface Roughness ◽  
Light Source ◽  
Vickers Hardness ◽  
Statistical Difference ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Anova Test ◽  
Significant Statistical Difference ◽  
Light Curing ◽  
Respective Solution

The study evaluated the influence of light curing units and immersion media on superficial roughness and microhardness of the nanofilled composite resin Supreme XT (3M/ESPE). Light curing units used were: XL 3000 (3M/ESPE), Jet Lite 4000 Plus (JMorita) and Ultralume Led 5 (Ultradent) and immersion media were artificial saliva, Coke®, tea and coffee, totaling 12 experimental groups. Specimens (10mm x 2mm) were immersed in each respective solution for 5 seconds, three times a day, during 60 days and so, were submitted to measure of superficial roughness (Ra) and Vickers hardness. Data were subjected to two-way ANOVA test (p<0.05). Results showed that only the light source factor showed statistically difference for hardness. It was observed that the hardness of the composite resin Filtek Supreme XT (3M/ESPE) was influenced by the light source (p<0.01) independently of the immersion media (p= 0.35) and the Jet Lite 4000 Plus (JMorita) was the light curing unit that presented lower values. In relation to surface roughness, it was noted no-significant statistical difference for light source (p=0.84), when specimens were immersed in different beverages (p=0.35).

Effects of Immersion Media and Repolishing on Color Stability and Superficial Morphology of Nanofilled Composite Resin

2014 ◽  
Vol 20 (4) ◽  
pp. 1234-1239 ◽  
Author(s):  
Ana Luísa Botta Martins de Oliveira ◽  
Ana Carolina Botta ◽  
Juliana Álvares Duarte Bonini Campos ◽  
Patrícia Petromilli Nordi Sasso Garcia
Keyword(s):  
Statistical Difference ◽  
Composite Resin ◽  
Color Change ◽  
Artificial Saliva ◽  
Color Stability ◽  
Color Reading ◽  
Immersion Medium ◽  
Mixed Analysis ◽  
Mouth Rinses ◽  
Scanning Electron

AbstractThis study evaluated the influence of fluoride mouth rinses and repolishing on the superficial morphology and color stability of nanofilled resin. About 150 specimens were prepared and polished using aluminum oxide discs for 15 s with a pressure of 2 kg. The experimental groups were divided according to the immersion medium (artificial saliva, 0.5% sodium fluoride, Fluordent Reach, Oral B, Fluorgard) and repolishing procedure (without and with). The specimens were continuously immersed for 1 week. Thereafter, half of each sample was repolished. A color reading was performed after 24 h of immersion in the artificial saliva baseline, after continuous immersion, and after repolishing. The superficial morphology was examined using scanning electron microscopy (SEM) in a qualitative way. Color change (∆E) data were submitted to a mixed analysis of variance using a Shapiro–Wilk test (p>0.05 for the different immersion media) and Sidak’s test (p<0.05 for the differences between groups). In the interaction between the repolishing and the immersion media, Fluorgard showed a statistical difference between the ∆E values with and without repolishing (p<0.0001). On the SEM observations, both Fluordent Reach and Fluorgard caused degradation of the superficial resinous matrix of the composite after continuous immersion. This matrix was removed after repolishing.

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 Abrasion resistance of composites polymerized by light-emitting diodes (LED) and halogen light-curing units

2006 ◽  
Vol 17 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Janisse Martinelli ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza ◽  
Luciana Assirati Casemiro ◽  
Camila Tirapelli ◽  
Heitor Panzer
Keyword(s):  
Surface Roughness ◽  
Mass Loss ◽  
Abrasion Resistance ◽  
Composite Resin ◽  
Composite Resins ◽  
Halogen Lamp ◽  
Light Emitting ◽  
Halogen Light ◽  
Light Curing ◽  
Toothbrush Abrasion

This study compared the abrasion resistance of direct composite resins cured by light-emitting diodes (LED) and halogen light-curing units. Twenty specimens (12 mm in diameter; 1.0 mm thick) of each composite resin [TPH (Dentsply); Definite (Degussa); Charisma (Heraus Kulzer)] were prepared using a polytetrafluoroethylene matrix. Ten specimens per material were cured with the LED source and 10 with the halogen lamp for 40 s. The resin discs were polished, submitted to initial surface roughness reading (Ra initial - mum) in a roughness tester and stored in water at 37°C for 15 days. The specimens were weighed (M1) and submitted to simulated toothbrushing using slurry of water and dentifrice with high abrasiveness. After 100 minutes in the toothbrushing simulator, the specimens were cleaned, submitted to a new surface roughness reading (Ra final - mum) and reweighed (M2). Mass loss was determined as the difference between M1 and M2. Data were recorded and analyzed statistically by one-way ANOVA and Tukey Test at 5% significance level. The composite resin with greater size of inorganic fillers (TPH) showed the lowest mass loss and surface roughness means, indicating a higher resistance to toothbrush abrasion (p<0.05). Definite cured with LED presented the least resistance to toothbrush abrasion, showing the highest means of surface roughness and mass loss (p<0.05). The LED source did not show the same effectiveness as the halogen lamp for polymerizing this specific composite resin. When the composite resins were cured a halogen LCU, no statistically significant difference was observed among the materials (p>0.05). It may be concluded that the type of light-curing unit and the resin composition seemed to interfere with the materials' resistance to abrasion.

scholarly journals UJI KEKERASAN RESIN KOMPOSIT AKTIVASI SINAR DENGAN BERBAGAI JARAK PENYINARAN

e-GIGI ◽  
2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Jimmy Allorerung ◽  
P. S. Anindita ◽  
Paulina N. Gunawan
Keyword(s):  
Visible Light ◽  
Light Source ◽  
Vickers Hardness ◽  
Sampling Method ◽  
Composite Resin ◽  
Composite Surface ◽  
Purposive Sampling ◽  
Hardness Tester ◽  
Post Test ◽  
Nanohybrid Composite

Abstract: Composite resin is a dental material which is used to fix the caries teeth because it have good esthetic and hardness. Visible light cured (VLC) composite resin hac better polymerization than chemical reaction composite resin. However, it does not have any abutment, therefore, the distance between light source and the composite surface is mostly ignored by the operator. Lightning process is very important to obtained good polymerization, so that the composite has enough hardness to hold back human masticate pressure. Composite which does not have enough hardness will be easily cracked. This study aimed to find out the correct distance of polymerization so that the composite resin has enough hardness to hold back human masticate pressure. This study used a post-test only design group and was conducted at the Laboratory of Metalurgy University of Sam Ratulangi. There were 27 samples of nanohybrid composite resin obtained by using a purposive sampling method. The measurement used was the Vickers method and micro Vickers hardness tester. The results showed that the group that had the highest hardness value was the first group with a lightning distance of 0 mm or light source touching composite resin surface, the value of hardness was 841.49 N/mm2. This value step by step decreased because the lightning distance increased, so that the lowest hardness value is 290,95 N/mm2 which on ninth group. Conclusion: The lightning distance of nanohybrid composite resin which could hold back the maximum human masticate pressure was on distance 0-6 mm.Keyword : distance of lightning, nanohybrid composite resin, hardness value.Abstrak: Resin komposit merupakan bahan tumpatan yang sering digunakan dalam kedokteran gigi karena memiliki nilai estetis serta kekerasan yang baik. Resin komposit aktivasi sinar berpolimerisasi lebih baik daripada resin komposit aktivasi kimia, tetapi alat visible light cured (VLC) yang digunakan tidak memiliki dudukan sehingga jarak antara sumber sinar dengan permukaan komposit saat penyinaran sering diabaikan. Proses penyinaran sangat penting agar terjadi polimerisasi yang baik sehingga komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah manusia. Kekerasan yang tidak cukup dapat menyebabkan komposit mengalami cracking atau pecahnya tumpatan didalam mulut. Tujuan penelitian ini untuk mengetahui jarak penyinaran yang tepat agar resin komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah manusia. Metode penelitian yang digunakan adalah metode post-test only design group yang diukur pada resin komposit jenis nanohibrid dan dilakukan di Laboratorium Metalurgi Jurusan Teknik Mesin Universitas Sam Ratulangi, dengan sampel sebanyak 27 sampel. Pengambilan sampel dilakukan dengan metode purposive sampling dan pengukuran kekerasan komposit menggunakan metode Vickers dan alat micro vickers hardness tester. Hasil penelitian menunjukan bahwa kelompok yang memiliki nilai kekerasan tertinggi terdapat pada kelompok pertama dengan jarak penyinaran 0 mm atau sumber sinar menyentuh permukaan komposit dengan nilai kekerasan 841,49 N/mm2. Nilai kekerasan ini secara bertahap menurun seiring dengan bertambah jauh jarak penyinaran, sehingga nilai kekerasan paling rendah terdapat pada kelompok penyinaran 8 mm yaitu 230,95 N/mm2. Kesimpulan dari penelitian ini yaitu jarak penyinaran terhadap resin komposit jenis nanohibrid sehingga resin komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah maksimal manusia berkisar pada jarak 0-6 mm.Kata kunci : jarak penyinaran, resin komposit nanohibrid, nilai kekerasan

Study Regarding the Influence of Different Antiseptic Mouthwashes on Surface Roughness of Traditional Glass Ionomer Cements

2015 ◽  
Vol 660 ◽  
pp. 165-169
Author(s):  
Simona Stoleriu ◽  
Sorin Andrian ◽  
Galina Pancu ◽  
Irina Nica ◽  
Andrei Victor Sandu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Vickers Hardness ◽  
Artificial Saliva ◽  
Surface Hardness ◽  
Study Groups ◽  
Control Group ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Microhardness Tester

The aim of the study was to evaluate the surface hardness of two different traditional glass ionomer cements after their exposure to two commercial oral rinsing solutions. Fuji IX GP (GC Corporation, Tokyo, Japan) and Ketac Molar Easymix (3MESPE, Germany) were used in the study. Twenty-one cement samples of each material were split in three groups. In control group the samples were stored in artificial saliva (AFNOR NF S90-701) for 14 days. In groups 2 and 3 the samples of each material were immersed in Listerine and in Corsodyl two times on a day for 14 days. Between the immersion periods the samples were stored in artificial saliva. The samples were subjected to microhardness evaluation using digital microhardness tester (Micro-Vickers Hardness System CV-400DMTM, CV Instruments Namicon). Significant results were obtained when compared the surface hardness of both glass ionomer cements after their immersion in Listerine and in Corsodyl to control group. The surface hardness of Fuji IX in control and in study groups was significantly higher when compared to Ketac Molar Easymix In the conditions of the study, Listerine and Corsodyl decreased the surface hardness of Fuji IX GP and Ketac Molar Easymix glass ionomer cements.

scholarly journals Penetration capability of three different light curing units to composite-resin as measured by radiometer

2018 ◽  
Vol 30 (2) ◽  
pp. 130
Author(s):  
Henri Hartman
Keyword(s):  
Light Source ◽  
Composite Resin ◽  
Daily Basis ◽  
Dental Practice ◽  
Restorative Material ◽  
Light Penetration ◽  
Output Intensity ◽  
Light Curing ◽  
Pass Through ◽  
Aesthetic Consideration

Introduction: Composite-resin is widely used as a restorative material in dental practice on a daily basis when it comes to an aesthetic consideration. The purpose of this study is to investigate and compare the light penetration capabilities of three light curing units (LCU) through layers of composite resin using a radiometer.  Method: Composites resin discs (2mm thick with 8 mm diameter) were cured out of seven different shades. Each specimen were used as a barrier, and a light source from three different LCUS was then applied through it. The radiometer was used to record the intensities of each LCU. Result: LED.C (Woodpecker™) has the lowest penetration capabilities to pass through the barrier compared to all LCU. The output intensity (mW/cm2) of all LCU has decreased gradually. ANOVA test showed that there was the significant result (p<0.01) for each specimen. Conclusion: The differences composite-resin shade could decrease the penetration capability of LCU.

Influence of pre-heat treatment and different light-curing units on Vickers hardness of a microhybrid composite resin

Laser Physics ◽  
2009 ◽  
Vol 19 (6) ◽  
pp. 1276-1281 ◽  
Author(s):  
E. G. Saade ◽  
M. C. Bandeca ◽  
A. N. S. Rastelli ◽  
V. S. Bagnato ◽  
S. T. Porto-Neto
Keyword(s):  
Heat Treatment ◽  
Vickers Hardness ◽  
Composite Resin ◽  
Light Curing

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 Effect of Different Finishing and Polishing Techniques on Surface Roughness of Two Universal Nanohybrid Composite Resins

2020 ◽  
Vol 8 (D) ◽  
pp. 182-188
Author(s):  
Ebaa Alagha ◽  
Waad Alotaibi ◽  
Maha Maghrbil ◽  
Laila Hakami ◽  
Maram Alrashedi
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Vision System ◽  
Mean Value ◽  
Composite Resins ◽  
Resin Composites ◽  
Light Sectioning ◽  
Light Curing ◽  
Nanohybrid Composite ◽  
Glass Slab

AIM: This study investigated the effect of different finishing and polishing systems on surface roughness of two types of universal nanohybrid composite resins. MATERIALS AND METHODS: A total number of 40 samples will be prepared to form two main equal groups of specimens (n = 20), according to the composite resin materials. Two universal nanohybrid resin composites were used in this study. First group (A1) is a universal nanohybrid composite resin (Mosaic) and the second group (A2) is a universal nanohybrid composite resin (Harmonize). Each group was subdivided equally into four equal subgroups (n = 5), according to the used finishing and polishing systems. Mold was made to prepare the specimens with a central hole of 4 mm in diameter and 4 mm in thickness. Light curing tip was placed touching the glass slab for 20 s then the cured specimens were removed from the mold and the specimens immediately and immersed in distilled water at 37°C for 24 h. Surface roughness (Ra) was measured using light sectioning vision system. SEM was done to support the results. RESULTS: The results showed that the lowest (Ra) values were recorded by the specimens under Myler strip followed by Polishing Discs treated specimens followed by Diacomp Plus specimens and the highest (Ra) values were recorded by white polishing stone specimens and regardless to finishing or polishing, it was found that mosaic resin composites group recorded statistically significant (p < 0.05) lower roughness mean value than Harmonize resin composites group. p ≤ 0.05 is statistically significant in all tests. CONCLUSION: Achieving long-lasting esthetics in resin composites restorations needs special attention for obtaining optimal resin polymerization and a perfect surface finish using the appropriate finishing and polishing system.

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