Surface Roughness of Acrylic Resins after Different Curing and Polishing Techniques

Alves, Patrícia Valéria Milanezi; Filho, Roberto M. A. Lima; Telles, Elise Lanziotti; Bolognese, Ana Maria

doi:10.2319/0003-3219(2007)077[0528:sroara]2.0.co;2

Cited by 19 publications

(18 citation statements)

References 7 publications

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“…The surface roughness of provisional crowns depends on the type of acrylic resin employed, as well as the processing technique 6 and the type of surface polishing 7,8 . Differences in polishing techniques have been found to interfere in roughness 9,10,11 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of surface physical properties of acrylic resins for provisional prosthesis

et al. 2008

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Acrylic resins used for provisional prostheses should have satisfactory superficial characteristics in order to ensure gingival health and low bacterial attachment. The purpose of the present study was to evaluate the superficial roughness and contact angle after two types of polishing and the Vickers hardness of three acrylic resins (Duralay -G1, Dencrilay -G2, and Dencor -G3), all shade 66, indicated for provisional fixed prostheses. Five 20 x 3 ± 1 mm diameter discoid specimens were obtained for each group. One side of the specimens was subjected to standard polishing (pumice and whiting slurry), and the opposite side was polished with special tips. The mean roughness and contact angles of the materials were measured. The specimens were subjected to the Vickers microhardness test, which indicated that standard polishing produced a surface roughness equivalent to that of the special tips. The contact angles obtained with the standard polishing were equivalent to those observed in the special tips group. The microhardness of G1 and G3 resins showed statistical differences.

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Section: Introductionmentioning

confidence: 99%

Evaluation of surface physical properties of acrylic resins for provisional prosthesis

et al. 2008

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“…The increase in surface roughness suggests that in clinical conditions, considerable discomfort to the patient and risk for periodontal diseases by the accumulation of biofilm on the temporary restoration may also increase 36,37 . According to Bollen et al 38 , surface roughness values higher than 0.2 µm facilitate microbial adhesion both in vitro and in vivo studies.…”

Section: Discussionmentioning

confidence: 99%

Effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations

et al. 2010

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Purpose: This study evaluated the effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations. Material and Methods: Three acrylic resins (Dencor-De, Duralay-Du, and Vipi Cor-VC) were selected and one composite resin (Opallis-Op) was used as a parameter for comparison. The materials were prepared according to the manufacturers' instructions and were placed in stainless steel moulds (20 mm in diameter and 5 mm thick). Thirty samples of each resin were made and divided into three groups (n = 10) according to the moment of Vickers hardness (VHN) and roughness (Ra) analyses: C (control group): immediately after specimen preparation; Sw: after storage in distilled water at 37 °C for 24 hours; Tc: after thermocycling (3000 cycles; 5-55 °C, 30 seconds dwell time). Data were submitted to 2-way ANOVA followed by Tukey's test (α = 0.05). Results: Op resin had higher surface hardness values (p < 0.0001; 25.4 ± 3.4) than the other ones (De = 4.5 ± 0.6; Du = 5.5 ± 0.4; VC = 6.1 ± 0.9). There was no statistical difference (p > 0.05) in roughness among materials (De = 0.31 ± 0.07; Du = 0.51 ± 0.20; VC = 0.41 ± 0.15; Op = 0.42 ± 0.18). Storage in water did not change hardness and roughness of the tested materials (p > 0.05). There was a significant increase in roughness after thermocycling (p < 0.05), except for material Du, which showed no significant change in roughness in any evaluated period (p = 0.99). Conclusion: Thermocycling increased the roughness in most tested materials without affecting hardness, while storage in water had no significant effect in the evaluated properties.

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“…Dosadašnjim istraživanjima dokazane su veća poroznost i slabija mehanička svojstva hladno-u odnosu na toplopolimerizovane akrilate, što je posledica njihove brže polimerizacije pod slabo kontrolisanim uslovima. Površinska poroznost stomatoloških akrilatnih materijala uzrok je njihove veće adherentnosti za sadržaj iz usne duplje i spoljašnje sredine (hrane, napitaka i duvanskog dima) i nesumnjivo je češća kod hladno polimerizovanih akrilata 9 . Šupljine u materijalu, često nevidljive golim okom, kolektori su infektivnog sadržaja i pigmenata koji menjaju boju zubne nadoknade 6 .…”

Section: Uvodunclassified

“…Previous research demonstrated the higher porosity and lower mechanical properties of cold-compared to the heat-polymerized acrylates, as a result of their rapid polymerization under poorly controlled conditions. The surface porosity of dental resin material is a cause of their greater adherence to the content from the oral cavity and the external environment (food, beverages and tobacco smoke) and undoubtedly is more common in cold-polymerized acrylate 9 . Cavities in the material, often invisible to the naked eye, are collectors of infectious content and pigments that change the color of denture 6 .…”

Section: Introductionmentioning

confidence: 99%

Examination of adherence of dental acrylic polymers in vivo

Kostić¹,

Krunić²,

Najman³

et al. 2014

Acta stomatologica Naissi

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Surface Roughness of Acrylic Resins after Different Curing and Polishing Techniques

Abstract: The average pattern of roughness of the self-curing acrylic resin was statistically the same in the groups with different curing methods. However, chemical polishing increases the average pattern of roughness.

Cited by 19 publications

References 7 publications

Evaluation of surface physical properties of acrylic resins for provisional prosthesis

Evaluation of surface physical properties of acrylic resins for provisional prosthesis

Effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations

Examination of adherence of dental acrylic polymers in vivo

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