Surface roughness average and scanning electron microscopic observations of resin luting agents

Mondelli, Rafael Francisco Lia; Prakki, Anuradha; Cilli, Renato; Navarro, Maria Fidela de Lima; Mondelli, José

doi:10.1590/s1678-77572003000400010

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…In contrast, some authors consider that the stress relief is related to the relaxation of the polymer chains when the vitrification point is achieved [2] or during the conversion of carbon double bonds when high molecular weight molecules are present in all conversion percentages inclusive at lower percentages which are obtained near the end reaction [2]. This condition means that the mobility of the polymer network will be restricted at higher DCs, delaying the gel point and the vitrification point relative to the conversion [25].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the flexural resistance and stress contraction of a silorane-based composite submitted to different protocols of polymerization

Lopes¹,

Serralvo²,

Felizardo

et al. 2014

Appl Adhes Sci

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When introduced to the market, silorane-based materials promised less contraction compared to other materials. The purpose of this study was to evaluate the contraction stress, flexural strength, and elastic modulus of the Filtek Silorane composite with different photoactivation protocols. Filtek Silorane and Filtek Z350 composites were inserted in a circular photoelastic resin matrix and subjected to photoactivation at 650 mW cm 2 for 40 s (protocol I), 325 mW cm 2 for 80 s (protocol II), 100 mW cm 2 for 260 s (protocol III), 100 mW cm 2 for 5 s + 1 min delay +650 mW cm 2 for 39.5 s (protocol IV), or 100 mW cm 2 for 5 s + 3 min delay +650 mW cm 2 for 39.5 s (protocol V). Five samples were prepared for each resin with each photoactivation protocol. To determine contraction stress, fringes were analyzed in a polariscope. For flexural strength analyses, 25 specimens (10 × 2 × 2 mm) of each resin with each photoactivation protocol were submitted to the 3-point bending test in a universal testing machine. Data were submitted to ANOVA and post hoc Tukey's tests (α = 0.05). Filtek Silorane showed higher contraction stress results than Filtek Z350 for protocols II (16.4 ± 3.88 vs. 5.9 ± 1.64 MPa), IV (17 ± 2.67 vs. 8.8 ± 1.30 MPa), and V (16.3 ± 3.33 vs. 5.1 ± 1.95 MPa). Both resins showed similar flexural strength values, but the elastic modulus of Filtek Silorane was significantly higher with all photoactivation protocols. Pulse-delay photoactivation was effective for Filtek Z350, but not Filtek Silorane, because the elastic modulus and contraction stress were reduced for Filtek Z350 without any change in flexural strength.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the flexural resistance and stress contraction of a silorane-based composite submitted to different protocols of polymerization

Lopes¹,

Serralvo²,

Felizardo

et al. 2014

Appl Adhes Sci

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“…Toothbrushing abrasion was performed in a toothbrushing machine (Elquip, Sao Carlos, Brazil) particularly developed for testing purposes 15,16 with soft-bristle dental brushes (Johnson & Johnson Industrial Ltda., Sao José dos Campos, Brazil) and abrasive toothpaste (Colgate Palmolive Ltda., Sao Bernardo do Campo, Brazil). Toothbrushes were positioned to have contact with only half of the specimen surface, and the other half remained protected with isolation tape.…”

Section: Toothbrushing Abrasionmentioning

confidence: 99%

Surface roughness and wear of resin cements after toothbrush abrasion

et al. 2014

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Increased surface roughness and wear of resin cements may cause failure of indirect restorations. The aim of this study was to evaluate quantitatively the surface roughness change and the vertical wear of four resin cements subjected to mechanical toothbrushing abrasion. Ten rectangular specimens (15 × 5 × 4 mm) were fabricated according to manufacturer instructions for each group (n = 10): Nexus 3, Kerr (NX3); RelyX ARC, 3M ESPE (ARC); RelyX U100, 3M ESPE (U100); and Variolink II, Ivoclar/Vivadent (VL2). Initial roughness (Ra, µm) was obtained through 5 readings with a roughness meter. Specimens were then subjected to toothbrushing abrasion (100,000 cycles), and further evaluation was conducted for final roughness. Vertical wear (µm) was quantified by 3 readings of the real profile between control and brushed surfaces. Data were subjected to analysis of variance, followed by Tukey's test (p < 0.05). The Pearson correlation test was performed between the surface roughness change and wear (p < 0.05). The mean values of initial/final roughness (Ra, µm)/wear (µm) were as follows: NX3 (0.078/0.127/23.175); ARC (0.086/0.246/20.263); U100 (0.296/0.589/16.952); and VL2 (0.313/0.512/22.876). Toothbrushing abrasion increased surface roughness and wear of all resin cements tested, although no correlation was found between those variables. Vertical wear was similar among groups; however, it was considered high and may lead to gap formation in indirect restorations.

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“…This work has been applied in diverse applications. The correlation matrix has been applied to the roughness of electro discharge machining (Brown et al ., ), and the list of parameters has been applied in applications such as dentistry (Radford et al ., ; Mondelli et al ., ), honed surface (Rosen et al ., ), and ground surfaces (Pancewicz and Mruk, ).…”

Section: Introductionmentioning

confidence: 99%

Roughness parameter selection for novel manufacturing processes

Ham

Powers

2013

Scanning

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This work proposes a method of roughness parameter (RP) selection for novel manufacturing processes or processes where little knowledge exists about which RPs are important. The method selects a single parameter to represent a group of highly correlated parameters. Single point incremental forming (SPIF) is used as the case study for the manufacturing process. This methodology was successful in reducing the number of RPs investigated from 18 to 8 in the case study.

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Surface roughness average and scanning electron microscopic observations of resin luting agents

Cited by 4 publications

References 16 publications

Evaluation of the flexural resistance and stress contraction of a silorane-based composite submitted to different protocols of polymerization

Evaluation of the flexural resistance and stress contraction of a silorane-based composite submitted to different protocols of polymerization

Surface roughness and wear of resin cements after toothbrush abrasion

Roughness parameter selection for novel manufacturing processes

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