Physical Properties of Four Thermosetting Dental Restorative Resins

Lee, Henry L.; Swartz, Michael L.; Smith, F.F.

doi:10.1177/00220345690480040501

Cited by 66 publications

(11 citation statements)

References 6 publications

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“…compressive strength, diametral tensile strength, hardness, opacity, colour stability, strain resistance, toluene extractables, and toothbrushing wear loss. Similar compilations are in the literature for other composite materials (Lee, Swartz & Smith, 1969;Griffith & Cannon, 1973).…”

Section: Introductionsupporting

confidence: 68%

Differences in the physical properties of composite dental restoratives

Lee¹,

Orłowski²

1977

J of Oral Rehabilitation

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Section: Introductionsupporting

confidence: 68%

Differences in the physical properties of composite dental restoratives

Lee¹,

Orłowski²

1977

J of Oral Rehabilitation

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“…Water sorption may also have deleterious effects in composite materials (Gotfredsen, 1969;Lee, Swartz & Smith, 1969) which may be accelerated by the presence of alcohol. Swelling from liquid sorption by composites could induce stress around the stiff filler inclusions as a result of matrix expansion.…”

Section: Introductionmentioning

confidence: 99%

Effects of food/oral simulating fluids on microstructure and strength of dentine bonding agents

Lee

Greener²,

Covey

et al. 1996

J of Oral Rehabilitation

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This study evaluated the effect a food simulating solution, 75% v/v ethanol/water, and an artificial saliva, Moi-Stir, have on the microstructure and on the diametral tensile strength (DTS) of three dentine bonding agents (Tenure, Scotchbond Multi-Purpose and Optibond). The microstructure was examined by using a scanning electron microscope (SEM). The DTS data were analysed using ANOVA and the Tukey LSD test. The microstructural observations were compared with changes in DTS. The SEM observation revealed deterioration of all bonding agents due to conditioning in the solutions for 30 days. The different solutions appeared to cause different reactions in the bonding agents. However, these effects may be exaggerated due to the presence of an air-inhibited surface layer. Those conditioned in Moi-Stir showed swelling. The presence of filler particles in the Optibond bonding agent appears to decrease the deterioration resulting from soaking. Materials conditioned in ethanol exhibited both dissolution and thinning. Diametral samples of each bonding material were tested after being conditioned in the above-mentioned solutions for 1, 7, 14 and 30 days. Conditioning significantly decreased the DTS of all bonding agents, except Optibond in Moi-Stir. Filled Optibond maintained its DTS longer than did the two unfilled bonding agents. The decrease in DTS of all the ethanol-conditioned groups is a function of the square root of time (P < 0.001) and conforms to Fick's laws of diffusion. The filled Optibond showed a lower ethanol diffusivity (0.5 x 10(-5) cm2 s-1) than the other two unfilled bonding agent systems (average 1.2 x 10(-5) cm2 s-1) (P < 0.05). The high ethanol diffusivities were thought to be due to the presence of HEMA, a hydrophilic resin, in the bonding agent. These results also suggest that solution uptake occurred through the resin matrix. Filler particles may therefore play an important role in weathering resistance of these materials to oral environment solutions. The physical appearance and strength of dentine bonding agents are significantly altered by exposure to oral environment solutions.

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“…One of the basic drawbacks of restorative resins is the inevitable shrinkage during their polymerization; this shrinkage is often measured as the volume contraction of free test specimens (Lee et al, 1969;Dennison and Craig, 1972;Goldman, 1983). However, the volume polymerization contraction has little, if any, relationship to the actual wall-to-wall polymerization contraction in a dental cavity (Asmussen and Jorgensen, 1971;Hansen, 1986).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

Hansen

1986

J Dent Res

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The wall-to-wall polymerization contraction of two restorative resins was investigated in butt-joint dentin cavities prepared in extracted human teeth. The cavity diameter was 4 mm, and the cavity depth ranged between 0.5 and 3.0 mm. The width of the maximum marginal contraction gap was measured, using a light microscope, approximately 0.1 mm below the original free surfaces of the fillings. It was found that increasing the cavity depth from 0.5 to 3.0 mm did not influence the marginal contraction gap close to the free surfaces of the fillings. It was also found that a two-phase application technique, where the surface of the first layer was placed parallel to the free surface of the cavity, did not reduce the marginal contraction gap, while a two-phase technique with oblique layers resulted in approximately a 25% reduction.

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Physical Properties of Four Thermosetting Dental Restorative Resins

Cited by 66 publications

References 6 publications

Differences in the physical properties of composite dental restoratives

Differences in the physical properties of composite dental restoratives

Effects of food/oral simulating fluids on microstructure and strength of dentine bonding agents

Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

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