Depth of cure of visible light-cured resin: clinical simulation.
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Chemical Phenomena↗
Biomedical subjects
J L Ferracane
Publications and source records attributed to J L Ferracane.
Relationship between shade and depth of cure for light-activated dental composite resins.
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Chemical Phenomena↗
Ultraviolet light-induced yellowing of dental restorative resins.
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Bisphenol A-Glycidyl Methacrylate↗
Correlation between hardness and degree of conversion during the setting reaction of unfilled dental restorative resins.
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Acrylic Resins↗
Time-dependent deformation of composite resins--compositional considerations.
The compressive yield strength and creep of 21 dental composite resins were evaluated and correlated with filler volume percent and extent of cure in the resin. In general, yield and creep of composites were more dependent upon filler volume fraction than on extent of cure. However, the types of monomers and fillers used in the composite formulation appeared to play a major role in determining the compressive characteristics of the materials.
Carbon↗
Effects of fat admixture on the strengths of conventional and low-viscosity bone cements.
The diametral tensile and compressive strengths of both conventional doughy and low-viscosity (LVC) bone cements were tested with sequential admixtures of up to 50% (by weight) liquified fat. The addition of as little as 5% (by weight) fat caused a significant reduction (p = 0.05) in the strengths of both cements. The LVC appeared to be affected to a greater degree by fat contaminations than did the conventional cement, although the strengths of the LVC were generally equal to or higher than those of the conventional cement. The enhanced effect of fat contamination on the LVC was thought to be due to the more fluid, tacky nature of this material during administration.
Animals↗
Fourier transform infrared analysis of degree of polymerization in unfilled resins--methods comparison.
Two methods of transmission Fourier Transform Infrared analysis were compared to determine the degree of polymerization (DP) in unfilled Bis-GMA-based dental resins. Diluent concentration, curing mode, and activator type were investigated. DP ranged from 55-72% and was highest for the most diluted resins. The effects of polymerization activation mode and type were insignificant. DP was slightly enhanced in the bulk of the resin, as determined by a KBr-pellet technique, in comparison with results from a thin film method, but both techniques seem to provide useful and reproducible results for dental resins.
Bisphenol A-Glycidyl Methacrylate↗
Rheology of composite restoratives.
The components of Adaptic and Nuva-fil have been found to be the most viscous, while those of Concise were found to be the least viscous. The viscosity of setting systems revealed Adaptic to be the most viscous overall and Profile the least. All components and setting materials were shown to be pseudoplastic, with flow properties most likely controlled by the resin phase. The cone and plate have been found to be a feasible method for working time determination, with Profile having an extended working period, compared to the other systems tested.
Composite Resins↗
Rheology of acrylic bone cements.
The rheological properties of setting acrylic bone cements were examined with a rotational cone and plate viscometer. The cements were tested over two orders of magnitude of shear rate to determine the nature of any non-Newtonian flow behavior. All three cements behaved with moderate pseudoplasticity (i.e., shear thinning) during setting, suggesting the use of higher pressures during administration for better flow and penetration. The low viscosity brand was found to be nearly one-half as viscous as the conventional cements during the working time (i.e., 2-5 minutes). A series of sieving experiments were performed to determine the particle size distributions of the powder components. Statistical analysis (chi square) showed the cements to have different distributions, with the low viscosity brand containing a larger proportion of smaller polymer particles. This difference is thought to contribute to the lower viscosity of this cement.
Bone Cements↗
Microleakage of composite resin restorations following thermocycling and instrumentation.
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Bisphenol A-Glycidyl Methacrylate↗
Orthodontic band retention on primary molar stainless steel crowns.
The retention of orthodontic bands cemented on primary molar stainless steel crowns (SSC) was studied in vitro. Unitek maxillary and mandibular 1st and 2nd primary molar SSC were fitted with one of four commonly used orthodontic bands (Unitek regular, Unitek narrow, Rocky Mountain, or custom bands made from SSC) using glass ionomer cement. The cemented samples were tested for their resistance to dislodgment on the Instron Universal Testing Machine (Instron Engineering Corp., Canton, MA) in tensile mode. Alpha level for statistical significance was set at alpha = 0.05. Unitek regular bands cemented on the 2nd molar crowns and Unitek narrow bands cemented on the 1st molar crown samples had equivalent or superior resistance to dislodgment compared with the other bands in the study. When the inside of the band and the outside band-bearing surfaces of selected crowns were lightly scored with a diamond bur prior to cementation, samples exhibited significantly superior retention. Subgroup means increased from 107 to 330%, compared to the values obtained in their preroughened state. The mean values obtained using the roughened band/crown interface technique (range 52.9 +/- 7.6 to 73.6 +/- 8.4 lbs) compared favorably with retention values from the literature for orthodontic bands cemented on permanent molar and premolar teeth.
Analysis of Variance↗