Influence of ceramic thickness on the polymerization of light-cured resin cement

Blackman, Ronald B.; Barghi, Nasser; Duke, E. Steven

doi:10.1016/0022-3913(90)90199-m

Cited by 98 publications

(88 citation statements)

References 8 publications

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“…Evidence that the co-initiator of Optibond Solo was effective when Nexus 2 was applied to the light-activated adhesive layer may confirm that the self-curing mechanism by itself is ineffective in providing reliable mechanical properties to resin cements as previously reported. [9][10][11][26][27] This hypothesis was confirmed when fracture analysis of µTBS specimens revealed the failure pattern predominantly located at the bottom of the resin cement layer (Figure 4). …”

Section: Fractured Specimen Using All Bond 2 When Primer Was Light mentioning

confidence: 87%

“…8 In addition, by evaluating in vitro occlusal wear, quantity of the remaining double bonds and hardness, some authors indicated that the chemical curing mechanism alone is less effective than the light-activated one when dual-cured restorative materials are used. [9][10][11] Based on this evidence, some manufacturers recommend light activation of dual-cured adhesive systems prior to applying resin cement and seating the restoration of the prepared tooth. However, the difference in bond strength between these two clinical techniques for cementation of indirect restorations when dual-cured adhesive systems are used has yet to be evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Curing Mode on Microtensile Bond Strength to Dentin of Two Dual-cured Adhesive Systems in Combination with Resin Luting Cements for Indirect Restorations

Arrais

Giannini

Pashley³

2007

Operative Dentistry

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SUMMARYThis study evaluated the microtensile bond strength (µTBS) of dual-cured adhesive systems when the different components were either light activated or left in the uncured state prior to cementation of an indirect composite restoration. Occlusal dentin surfaces of 40 human third molars were flattened. The teeth were randomly assigned to 8 groups (n=5) according to the dualcured systems (bonding agents/resin cements) and curing modes: All Bond 2/Duolink (AB2-BISCO Inc) and Optibond Solo Plus Dual Cure/Nexus 2 (SOLO-Kerr). Resin cements were applied to pre-cured resin composite discs (2 mm thick/Z-250/3M ESPE), which were fixed to dentin surfaces containing adhesive resin in either cured (LP) or uncured states (SP). The restored teeth were light activated according to the manufacturers' instructions (LRC-XL3000/3M ESPE) or allowed to self-cure (SRC). The restored teeth were water-stored at 37°C for 24 hours. They were then both mesial-distally and buccal-lingually sectioned to obtain bonded specimens (1.2 mm 2 ). Each specimen was tested in tension at a crosshead speed of 0.6 mm/minute until failure. Data (MPa (SD)) were analyzed by two-way ANOVA and Tukey's post-hoc test (p<.05). AB2/SP exhibited higher µTBS than AB2/LP (p=.00001); however, no significant differences were noted between SOLO/LP and SOLO/SP. Results suggested that dual-cured adhesive systems were as strong or even stronger when they were left in the uncured state prior to indirect resin composite cementation.

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Section: Fractured Specimen Using All Bond 2 When Primer Was Light mentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Effect of Curing Mode on Microtensile Bond Strength to Dentin of Two Dual-cured Adhesive Systems in Combination with Resin Luting Cements for Indirect Restorations

Arrais

Giannini

Pashley³

2007

Operative Dentistry

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“…13,14 The results from most studies have demonstrated that the self-curing mechanism is not as effective as the light-curing one. [13][14][15][16] However, no information is available in the literature regarding monomer conversion of dualcured resin composites used for core foundations when they are deprived of curing light in deep areas, or when they are used to cement posts into root canals. Therefore, the aim of the present study was to evaluate the hardness -which has been considered an indirect assessment of monomer conversion 14,17,18 -of dual-cure composite resin build-up materials when they are subjected to different curing conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

et al. 2010

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This study evaluated the Knoop Hardness (KHN) values of two dual-cured composite resin core build-up materials and one resin cement exposed to different curing conditions. Two dual-cured core buildup composite resins (LuxaCore  -Dual, DMG; and FluoroCore  2, Dentsply Caulk), and one dual-cured resin cement (Rely X ARC, 3M ESPE) were used in the present study. The composite materials were placed into a cylindrical matrix (2 mm in height and 3 mm in diameter), and the specimens thus produced were either light-activated for 40 s (Optilux 501, Demetron Kerr) or were allowed to self-cure for 10 min in the dark (n = 5). All specimens were then stored in humidity at 37°C for 24 h in the dark and were subjected to KHN analysis. The results were submitted to 2-way ANOVA and Tukey's post-hoc test at a pre-set alpha of 5%. All the light-activated groups exhibited higher KHN values than the self-cured ones (p = 0.00001), regardless of product. Among the self-cured groups, both composite resin core build-up materials showed higher KHN values than the dual-cured resin cement (p = 0.00001). LuxaCore  -Dual exhibited higher KHN values than FluoroCore  2 (p = 0.00001) when they were allowed to self-cure, while no significant differences in KHN values were observed among the light-activated products. The results suggest that dual-cured composite resin core build-up materials may be more reliable than dual-cured resin cements when curing light is not available.

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“…However, with a 40 s exposure to QTH light, very little difference was observed. Apparently, the light density attenuation effect of interposed restorative materials [22] is maximal within the narrow emission spectrum of the PAC light.…”

Section: Indirect Polymerizationmentioning

confidence: 98%

Comparative efficiency of plasma and halogen light sources on composite micro-hardness in different curing conditions

2003

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Objectives. Recent developments have led to the introduction of high power curing lights, which are claimed to greatly reduce the total curing time. This study evaluated the effectiveness of a plasma-curing device (Apollo 95 E) and a halogen device (Heliolux DLX), in different curing conditions.Method. Vicker's micro-hardness values were performed on 1 and 2 mm thick composite discs cured in a natural tooth mold by direct irradiation or indirect irradiation through composite material (2 or 4 mm) and dental tissues (1 mm enamel or 2 mm enamel-dentin). Measures were, respectively, performed after a 1, 3, 6 s (SC, step curing mode) or 18 s (3 £ SC) exposure to the plasma light, and a 5, 10, 20 or 40 s exposure to the halogen light.Results. With the PAC light used, a 3 s irradiation in the direct curing condition was necessary to reach hardness values similar to those obtained after a 40 s exposure to the halogen light. Using the indirect curing condition, hardness values reached after an 18 s exposure (3 £ SC mode) with the plasma light were either equivalent or inferior to those obtained with 40 s halogen irradiation.Significance. Direct polymerization with the plasma light used requires longer exposure times than those initially proposed by the manufacturer. The effectiveness of plasma generated light was lowered by composite or natural tissues, and therefore requires an important increase in the irradiation time when applied to indirect polymerization. The practical advantage of this polymerization method is less than expected, when compared to traditional halogen curing.

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Influence of ceramic thickness on the polymerization of light-cured resin cement

Cited by 98 publications

References 8 publications

Effect of Curing Mode on Microtensile Bond Strength to Dentin of Two Dual-cured Adhesive Systems in Combination with Resin Luting Cements for Indirect Restorations

Effect of Curing Mode on Microtensile Bond Strength to Dentin of Two Dual-cured Adhesive Systems in Combination with Resin Luting Cements for Indirect Restorations

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

Comparative efficiency of plasma and halogen light sources on composite micro-hardness in different curing conditions

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