Monomer Conversion of Pre-heated Composite

Daronch, Márcia; Rueggeberg, Frederick A.; Góes, Mário Fernando de

doi:10.1177/154405910508400716

Cited by 252 publications

(383 citation statements)

References 24 publications

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“…Such a finding corroborates previously reported results 10,11 and might be attributed to the increased radical mobility and collision frequency of the unreacted active groups and radicals resulting from the decrease in RC viscosity promoted by increased RC temperatures.…”

Section: Discussionsupporting

confidence: 93%

“…A temperature of 50º C was chosen based on other studies 10,11,23 and was maintained for 5 min during specimen polymerization. This methodology may differ from a clinical situation where a drastic drop in temperature of the heated resin composites is observed when they are placed in tooth cavities.…”

Section: Discussionmentioning

confidence: 99%

“…Although resin-based materials were heated to 50º C in most studies evaluating the effects of temperature, 10,11,[14][15][16] one could state that such a high temperature could damage the pulp tissue. However, it has been demonstrated that an increase in the temperature of resin composites to temperatures ranging between 54º C and 60º C does not significantly change the intrapulpal temperature.…”

Section: Discussionmentioning

confidence: 99%

“…3,[6][7][8][9] Some studies have shown that pre-heating the resin composite to 50º C or 60º C increases its degree of conversion (DC). 10,11 As a result, increased hardness and fracture strength, increased flexural strength and modulus, and increased resistance to wear are expected. 12,13 Therefore, it is reasonable to assume that dual-cured RCs polymerized at increased temperature might show higher DC and improved mechanical properties than RCs polymerized at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

2011

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This study evaluated the degree of conversion (DC) and ultimate tensile strength (UTS) of dual-cured resin cements heated to 50º C prior to and during polymerization. Disc-and hourglass-shaped specimens of Rely X ARC (RX) and Variolink II (VII) were obtained using addition silicon molds. The products were manipulated at 25º C or 50º C and were subjected to 3 curing conditions: light-activation through a glass slide or through a pre-cured 2-mm thick resin composite disc, or they were allowed to self-cure (SC). All specimens were dark-stored dry for 15 days. For DC analysis, the resin cements were placed into the mold located on the center of a horizontal diamond on the attenuated total reflectance element in the optical bench of a Fourier Transformed Infrared spectrometer. Infrared spectra (n = 6) were collected between 1680 and 1500 cm -1 , and DC was calculated by standard methods using changes in ratios of aliphatic-to-aromatic C=C absorption peaks from uncured and cured states. For UTS test, specimens (n = 10) were tested in tension in a universal testing machine (crosshead speed of 1 mm/min) until failure. DC and UTS data were submitted to 2-way ANOVA, followed by Tukey's test (α= 5%). Both products showed higher DC at 50º C than at 25º C in all curing conditions. No significant difference in UTS was noted between most light-activated groups at 25º C and those at 50º C. VII SC groups showed higher UTS at 50º C than at 25º C (p < 0.05). Increased temperature led to higher DC, but its effects on resin cement UTS depended on the curing condition.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

2011

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“…With higher temperatures (T > 37°C) increased cuspal movement has been observed [50], leading to a greater challenge on the bond to tooth interface. Additionally, higher final monomer conversion values can be achieved with pre-heated composite, thereby reducing the amount of unreacted monomer, which may potentially leach into oral cavity [51].…”

Section: Discussionmentioning

confidence: 99%

Marginal adaptation of ceramic and composite inlays in minimally invasive mod cavities

et al. 2013

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OBJECTIVES: This study aims to evaluate the effect of a minimally invasive mesial-occlusaldistal (mod) preparation on the marginal adaptation of ceramic and composite inlays with the aim of saving sound dental substance. MATERIALS AND METHODS: Class II mod cavities were prepared in 50 extracted human molars and randomly allocated to five groups (n = 10). In all groups, the mesialproximal box margins were located in the dentin, 1 mm below the cementoenamel junction (CEJ), while the distal box margins were 1 mm above the CEJ. In groups A and B, conventional standard preparations with a divergent angle of = 6°were prepared. In groups C, D, and E, minimally invasive standard preparations with a convergent angle of = 10°were prepared. In groups A and D, composite inlays and, in groups B and C, ceramic inlays were fabricated (chairside economical restoration of esthetic ceramics (CEREC)) and adhesively inserted. In group E, a direct composite filling using the incremental technique was placed. Replicas were taken before and after thermomechanical loading (1,200,000 cycles, 50/5°C, max. load 49 N). Marginal integrity (tooth-luting composite, luting composite-inlay) was evaluated by scanning electron microscopy (×200). The percentage of continuous margins in the different locations was compared between and within groups before and after cycling, using ANOVA and Scheffé post hoc test. RESULTS: After the thermomechanical loading, no significant differences were observed between the different groups with respect to the interface of luting composite-inlay. At the interface of toothluting composite for preparations involving the dentin, groups A and B behaved significantly better compared to the control group E, which in turn were not different to groups C and D. CONCLUSION: Composite and ceramic inlays inserted in minimally invasive prepared mod cavities result in margins not different from those of inlays placed in conventional mod preparations. Direct composite filling margins, however, were inferior to those attained by conventional indirect restorations. CLINICAL RELEVANCE: Minimally invasive preparations for mod inlays with undercuts show marginal adaptation equal to that of conventional inlay preparation design. Keywords: Composite inlay, ceramic inlay; minimally-invasive; marginal adaption Declaration of interests:The authors declare they have no conflicts of interest. AbstractObjectives To evaluate the effect of a minimally-invasive mod-preparation on the marginal adaptation of ceramic and composite inlays with the aim of saving sound dental substance. Materials and MethodsClass II mod-cavities were prepared in 50 extracted human molars and randomly allocated to five groups (n=10). In all groups, the mesial-proximal-box-margins were located in dentin, 1 mm below the cementoenamel junction (CEJ), while the distal-boxmargins were 1 mm above the CEJ. In group A and B, conventional standard preparations with a divergent angle of α = 6° were prepared. In Group C, D and E minimally invasive standard preparation...

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Photo‐Curing 3D Printing of Thermosetting Sacrificial Tooling for Fabricating Fiber‐Reinforced Hollow Composites

Zhao

Hao

Chang

et al. 2023

Adv Funct Materials

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Carbon fiber-reinforced hollow composites play a vital role in lightweighting modern cars and aircrafts. Fabrication of such hollow composites with seamless internal finish requires sacrificial tooling that can be used under pressure and high temperature. For the very first time, high performance sacrificial tooling that can be used to fabricate fiber-reinforced hollow composites is produced using photocuring 3D printing technology. This is achieved by developing UV-curable resins containing highly soluble yet hydrolysable acetal acrylate cross-linker and hydrophilic 4-acryloylmorpholine monomer. It is found that the cross-linker content greatly affects the printing speed. Further, the widely adopted UV postcuring method is found to have negligible impact on improving the thermalmechanical properties of printed structures. After thermal post-treatment, printed sacrificial tooling exhibits a heat deflection temperature of 112 °C at 0.455 MPa and an average coefficient of linear thermal expansion of 59 ppm °C−1 between 30 and 100 °C. As a result, printed tooling enables fabrication of carbon fiber-reinforced hollow composites with complex geometry, which shows a tensile strength of 802 MPa and an elastic modulus of 50.2 GPa.

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Monomer Conversion of Pre-heated Composite

Cited by 252 publications

References 24 publications

Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

Marginal adaptation of ceramic and composite inlays in minimally invasive mod cavities

Photo‐Curing 3D Printing of Thermosetting Sacrificial Tooling for Fabricating Fiber‐Reinforced Hollow Composites

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