Curing process modification of a ‘self-cured’ injection molding material: Effect on water sorption and solubility (original) (raw)
Related papers
Journal of Islamic Dental Association of IRAN, 2019
Background and Aim: Water sorption is one of the most important properties that affects the quality of a prosthesis, and subsequently, the quality of treatment, and patient's quality of life. The aim of this study was to determine and compare the water sorption of two types of poly methyl methacrylate (PMMA) using the injection-molding systems with a traditional acrylic resin base material. Materials and Methods: In this in vitro, experimental study, three groups of PMMA (n=10), consisting of two groups of injection molded PMMA samples (Vertex Castavaria and Ivo-Base High-Impact) were used for two different injection molding techniques and one group of conventional pressure-packed PMMA (Meliodent Heat Cure) was used for the conventional pressure-packed technique. After processing, 30 specimens were stored in distilled water at 37°C for 30 days. The water sorption test was then performed. Statistical analysis was carried out using SPSS version 23.0 via the Kruskal-Wallis and Mann-Whitney tests (α=0.05). Results: The mean value of water sorption was 17.88±1.08 µg/mm 3 for IvoBase specimens, 28.45±2.19µg/mm 3 for Vertex specimens, and 21.76 ±3.26 µg/mm 3 for Meliodent specimens (P<0.001 for Ivobase-Vertex, P <0.007 for Ivobase-Meliodent, and P<0.001 for Vertex-Meliodent). Conclusion: Water sorption of IvoBase was significantly lower than that of other materials. Despite such a significant difference, all of them completely fulfilled the requirements of EN ISO 20795-1:2008.
The Effect of Thickness of Heat Cured Acrylic Resin with Additives on Wa-ter Sorption and Solubility
Aims : The aims of this study were to determine the effect of thickness and additives (Nigella Stavia oil and Thymol oil) on water sorption and solubility of heat cured acrylic resin denture base. Materials and Methods: Two types of heat cured acrylic resin Quayle dental resin and Major base2 were used. Two additive materials (0.5%) have been added to major base 2 which are(Nigella Stavia oil and Thy-mol oil). Water sorption and solubility of specimens were measured by mean of mass change in material after water saturation and dehydration. The specimens were prepared in three thicknesses (1mm, 2mm and 3mm). The effect of thickness on water sorption and solubility also has been measured. The data were analyzed using analysis of variance and Duncan's multiple range tests. Results: Increase thickness causes decrease in water sorption and solubility; Q.D has more water sorption and solubility than major acrylic resin. The two additives caused an increase in the water sorption and solubility of major acrylic resin denture base. Conclusions: The thickness and type of manufacturing materials added into acrylic resin played an important role in determining its water sorption and solubility.
Water Sorption and Solubility of an Experimental Dental Material: Comparative Study
Applied Medical …, 2011
Aim: The physico-chemical properties of an experimental composite resin used for indirect dental restorations were investigated. The goal was to evaluate the variation of water sorption and solubility of the composite specimens during a 7 day period of immersion and to assess the effect of an additional post-curing treatment on these properties. Material and Methods: The specimens were prepared and investigated according to the ISO standard 4049:2000. Two group of specimens were studied i.e. light-cured and post-cured (group A) samples and light-cured (group B) samples. Results: Significant statistical differences were observed regarding water sorption in both groups (p<0.05), the mean values being higher in the first days of immersion. Regarding the water solubility, negative values were obtained, that varied throughout the entire period of immersion; the solubility is masked by the higher values of water sorption. Conclusion: All the specimens present relative high water sorption values especially during the first three days of immersion. The additional post-curing treatment decreases the water sorption and solubility values.
2019
1 D.D.S, Department of Prosthodontics, Faculty of Dentistry, Mahidol University 2 D.D.S., Grad. Diploma in Clinical Science (Prosthodontics), M.Sc. (Dental Materials Science), Ph.D. (Biomaterials), Diplomate Thai Board of Prosthodontics, Department of Prosthodontics, Faculty of Dentistry, Mahidol University 3 D.D.S., M.Sc., (Prosthodontics), Ph.D. (Dental Materials Science), Diplomate Thai Board of Prosthodontics, Department of Prosthodontics, Faculty of Dentistry, Mahidol University
Influence of pulse-delay curing on sorption and solubility of a composite resin
Journal of Applied Oral Science, 2009
he purpose of this study was to evaluate the sorption and solubility of a composite resin (TPH 3 ; Dentsply) cured with halogen light due to different storage media and curing modes. The methodology was based on the ISO 4049 standard. Two independent groups were established according to the storage time (7 days-G1; 60 days-G2). A stainless steel mould (2 mm x 8 mm Ø) was used. The selected curing modes were: I (Conventional-C): 40s-600 mW/cm 2 ; II (Pulse I-PD): 3 s-200 mW/cm² + 2 min (delay) + 39 s-600 mW/cm²; III (Pulse II): 10 s-200 mW/cm² + 2 min (delay) + 37 s-600 mW/cm²; IV (Pulse III): 3 s-600 mW/cm² + 2 min (delay) + 37 s-600 mW/cm². The media used were: distilled water, 75% ethanol and 100% chlorophorm. Five repetitions were made for each group. The specimens were placed in a desiccator at 37ºC for 24 h and, after that, at 23ºC for 1 h to be weighed until a constant mass (m 1) was obtained. The discs were immersed separately into the 3 media for 7 days (G1) and 60 days (G2), and thereafter reweighed (m 2). The reconditioning in the desiccator was done until a constant mass (m 3) was obtained. Sorption and solubility were calculated and the data of G1 and the sorption data of G2 were subjected to two-way ANOVA and Tukey's tests (p=0.05). The solubility data of G2 were analyzed by Kruskal-Wallis test (p=0.05). For G1 and G2, no statistically significant differences were found in sorption among curing techniques (p>0.05). The solubility values were negative, which means that there was mass gain. Regarding the storage media, in G2 chlorophorm had the highest sorption values. It may be concluded that the curing modes (C and PD I, II and III) did not affect the sorption of the tested composite resin. However, different storage media influenced sorption behavior. The solubility test demonstrated negative data, masking the real solubility.
Meandros Medical and Dental Journal, 2019
Objective: This study aimed to investigate and compare the water sorption (WS), solubility (SO) and surface roughness (SR) of four bulk fill resin-based composites (RBCs), a conventional flowable RBC and a conventional hybrid RBC. MaterialsandMethods:Disc-shaped specimens of 3 low-viscosity bulk fill RBCs (SureFil SDR flow, X-tra base, Filtek Bulk Fill flow), 1 high-viscosity bulk fill RBC (Tetric EvoCream Bulk Fill), 1 conventional low-viscosity flowable RBC (Filtek Ultimate flow) and 1 conventional hybrid RBC (Filtek Z250) (n=10) were prepared and immersed in distilled water for 28 days. Upon removal, specimens were weighed using an electronic scale to determine WS and SO based on weight gain/loss, and surface profilometry was performed to determine SR. Data were analyzed using one-way ANOVA and Tukey's post-hoc tests (p=0.05). Results: WS and SO showed significant, positive correlations (r=0.612; p<0.001), and both varied significantly among the materials, with WS and SO values of both high-filled and low-filled bulk fill RBCs lower than their conventional counterparts. Moreover, SR values of both bulk and conventional flowable low-fill RBCs were significantly lower in comparison to the high-fill RBCs (p<0.05). Conclusion: WS, SO and SR of RBCs are material-dependent and highly affected by filler loading and resin matrix composition. Bulk fill RBCs can be used in a large variety of clinical situations in line with the manufacturers' recommendations. Amaç: Bu çalışmanın amacı dört farklı bulk fill kompozit rezin ile bir adet geleneksel akışkan kompozit ve bir adet geleneksel hibrit kompozitin su emilimi, çözünürlük ve yüzey pürüzlülüğü değerlerini karşılaştırmalı olarak incelemektir. Gereç ve Yöntemler: Üç adet düşük viskoziteli bulk fill kompozit (SureFil SDR flow, X-tra base, Filtek Bulk Fill flow), bir adet yüksek viskoziteli bulk fill kompozit (Tetric EvoCream Bulk Fill), bir adet geleneksel düşük viskoziteli akışkan kompozit (Filtek Ultimate flow) ve bir adet geleneksel hibrit kompozit (Filtek Z250) kullanılarak disk şeklinde örnekler hazırlanıp distile suda 28 gün bekletilmiştir (n=10). Örnekler elektronik bir terazide tartılarak kütle kazanım ve kayıp değerlerine göre su emilimi ve çözünürlük değerleri hesaplanmıştır. Daha sonra yüzey pürüzlülüğü ölçümü için profilometre cihazı kullanılmıştır. Elde edilen veriler tek yönlü ANOVA ve Tukey post-hoc testleri ile analiz edilmiştir (p=0,05).
Short Term Sorption Effect on three Esthetic Dental Filling Materials in Various Media
Advances in Research, 2015
Aim: This study measures the weight gain of three esthetic restorative materials after immersion in water, Coke and Fanta for 120 hours. Materials and Methods: Three restorative materials (Visible Light Cure Composite; Prime Dental INC USA, GC Fuji IX GP; GC Corporation Japan, Amalgomer TM CR; Advanced HealthCare LTD, UK) and three immersion media (Distilled water, Cocacola; Nigeria Bottling Company LTD, Fanta; Nigeria Bottling company LTD) were used. A mold of 10 mm in diameter and 4 mm depth was constructed to form blocks. At different times, the materials were manipulated and placed into the mold using a plastic instrument. Fuji IX and Amalgomer CR were chemical cure materials, therefore they were left to polymerize in the mold. Composite was photopolymerized for 1 minute, and the specimens were removed after 24 hours. Three blocks of each test material were weighed thrice using calibrated electronic microbalance. The materials were immersed in either of the three Original Research Article
Journal of Clinical and Experimental Dentistry, 2020
Background: Due to the increasing popularity of bulk fill resins, there is a concern that their components can be leached; this is because these are inserted in a single 4-5 mm increment. This in vitro study evaluated the microhardness, sorption, solubility, and color stability of three restorative bulk fill resins, namely: Filtek Bulk Fill (FBF), Tetric N-Ceram Bulk Fill (TNC), and Opus Bulk Fill (OBF). Material and Methods: Cylindrical samples were fabricated to be 15 mm in diameter and 1 mm thick (n = 10). For the microhardness test, three random indentations were formulated on the samples using a micro-durometer with a load of 300 gf for 15 s. Sorption and solubility were then evaluated (ISO 4049: 2009). Color stability was analyzed with a digital spectrophotometer three times (initially, after 24 h, and after 7 d) during immersion in coffee and distilled water (control). The Shapiro-Wilk test was applied to analyze normality. The Mann-Whitney and Kruskal-Wallis tests were used to compare the groups and the immersion solution, with a significance level of 5%. Results: There were a significant difference in microhardness (p <0.001), with the FBF group showing a higher value compared to the other groups (56.38). The highest average of sorption scores was observed in the OBF group (16.9 µg / mm 3), followed by FBF (16.8 µg / mm 3) and TNC (11.3 µg / mm 3). Solubility was lowest in the OBF group (-2.83 µg / mm 3), with a significant difference (p = 0.031). There was also a significant difference after 24 h in the mean ∆E score of all groups (p <0.005). Conclusions: After one week of immersion, the group that pigmented most was OBF (p = 0.008). The three bulk fill resins had acceptable hardness, sorption, and solubility values. However, all groups showed a high pigmentation rate after 7 d of immersion in coffee.
Water sorption characteristics of light-cured dental resins and composites based on Bis-EMA/PCDMA
The water uptake characteristics of resins and composites based on an ethoxylated bisphenol A glycol dimethacrylate (Bis-EMA) and a polycarbonate dimethacrylate (PCDMA) were studied in detail. Polydimethacrylate resins were prepared by photopolymerization of the neat monomers and mixtures of them with various weight ratios, using the camphoroquinone/N; Ndimethylaminoethyl methacrylate system as initiator, while the composites were prepared from the light-curing of commercial samples (Sculpt-It and Alert). Water sorption/desorption was examined both in equilibrium and dynamic conditions in two adjacent sorption-desorption cycles. The equilibrium water uptake from all resins was very small with a trend to increase as the amount of PCDMA was increased. The inverse effect was observed in the solubility values. The composites studied exhibited also very low water uptake values in comparison to other composite materials reported in the literature. It was also observed that the equilibrium uptake decreased with increasing filler loading. Slightly larger equilibrium water uptake and much smaller solubility values were obtained during the second sorption-desorption cycle in comparison to the first one. Concerning the sorption rate data, it was observed that the resin materials followed Fickian diffusion during almost the whole sorption or desorption curve, while the composites showed this behavior until only M t =M N D0:5: The diffusion coefficients calculated for the resins were larger than those of the composites and always higher during desorption compared to sorption. The values of the diffusion coefficients for both resins and composites were in the same order of magnitude with the values of the corresponding materials reported in the literature. r
Characterization of water sorption, solubility and filler particles of light-cured composite resins
Brazilian Dental Journal, 2009
The goals of this study were to measure the water sorption (WS) and solubility (SO) of 3 composite resins containing different filler contents. Additionally, the size, shape, type and other characteristics of fillers were analyzed by scanning electron microscopy (SEM). Three composites, classified according to filler size, were selected: Filtek Supreme nanofill (3M/ESPE), Esthet-X minifill (Dentsply/ Caulk) and Renamel microfill (Cosmedent Inc.). Ten disk-shaped specimens of each resin composite were made and stored in desiccators until constant mass was achieved. Specimens were then stored in water for 7 days, and the mass of each specimen was measured. The specimens were dried again and dried specimen mass determined. The WS and SO were calculated from these measurements. Data analyzed by one-way ANOVA and Tukey's post-hoc test (α=0.05). Composite filler particles were observed under SEM after removal of resin matrix by organic solvents. WS values were not significantly different among the resins; however, SO values were lower for Filtek Supreme. The materials presented differences in filler contents (e.g. particle size and shape). The composite resins had similar WS, while the SO was lower for the nanofill than for mini and microfill resins. The filler characteristics varied and were different among the materials.