Effect of food and oral simulating fluids on structure of adhesive composite systems

Lee, S.-Y.; Greener, E.H.; Mueller, H.J.

doi:10.1016/0300-5712(95)90657-4

Cited by 49 publications

(31 citation statements)

References 13 publications

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“…13, 14, 15, 16 and 17 The latter may significantly reduce bond strength,18 probably through diffusion into the composite-tissue interface. 19 Despite several in-vitro investigations focusing selectively on chemical, thermal, or mechanical stressrelated impact, there is limited information on the effects of intraoral aging on composite properties in general, and nothing about intraoral aging of composites used to bond retainers in particular. 20 The purpose of this study was to assess the changes in the composition and mechanical properties of composite resins used for bonding orthodontic retainers after intraoral aging.…”

Section: Discussionmentioning

confidence: 99%

Retrieval analysis of lingual fixed retainer adhesives

Gugger

Pandis

Zinelis

et al. 2016

American Journal of Orthodontics and Dentofacial Orthopedics

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INTRODUCTION:Our objective was to analyze the surface and bulk properties alterations of clinically aged composites used for fixed retention. METHODS: Twenty-six lingual retainers bonded for different time periods (2.2-17.4 years) were retrieved from postorthodontic patients. Fifteen lingual retainers had been cemented by a chemically cured adhesive (Maximum Cure, Reliance Orthodontic Products, Itasca, Ill), and 11 were treated with a photo-cured adhesive (Flow-Tain, Reliance Orthodontic Products). The first group was in service for 2.8 to 17.4 years and the second for 2.2 to 5.4 years. Five specimens from each material were prepared and used as the control (or reference) group. The debonded surfaces from enamel were studied by attenuated total reflectance Fourier transform infrared spectroscopy (n = 3 per material per group), low-vacuum scanning electron microscopy, and energy dispersive x-ray microanalysis (n = 3 per material per group). All specimens were used for the assessment of Vickers hardness, indentation modulus, and elastic index with the instrumented indentation testing method. The values of Vickers hardness, indentation modulus, and elastic index were compared between the retrieved and the reference groups with 1-way analysis of variance and the Student-Newman-Keuls multiple comparison test ( = 0.05). RESULTS: The attenuated total reflectance Fourier transform infrared spectroscopy analysis showed that both retrieved composites demonstrated reduced unsaturation in comparison with the corresponding reference specimens. Some bonded surfaces showed development of organic integuments. All retrieved specimens showed reduced silicon content. Barium was identified only in the photo-cured group. No significant differences were found between the reference and retrieved groups in Vickers hardness, indentation modulus, and elastic index. CONCLUSIONS: Despite the changes in composition, the mechanical properties of the materials tested remained unaffected by intraoral aging.

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Section: Discussionmentioning

confidence: 99%

Retrieval analysis of lingual fixed retainer adhesives

Gugger

Pandis

Zinelis

et al. 2016

American Journal of Orthodontics and Dentofacial Orthopedics

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“…12 Infrared analysis of thin films of commercial composite resins exposed to water or artificial saliva for 30 days has shown no oxidative degradation of the resin matrix. 44,45 Our attempt to produce a subsurface damage layer in unfilled resins exposed to the NaOH solution has also not been successful (unpublished data, 1992). Based on the above discussion and the highly significant correlation observed between Si-loss and mass loss, and between mass loss and degradation depth (Table IV), we surmise that subsurface damage is the consequence of internal degradation of silane coupling and the siliceous filler particles and is not due to degradation of the resin matrix.…”

Section: Discussionmentioning

confidence: 99%

Internal corrosion in dental composite wear

Sarkar

2000

J. Biomed. Mater. Res.

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The internal corrosion of dental resin composites is associated with water-sorption and leads to (1) interfacial debonding, (2) filler dissolution, (3) matrix cracking, and (4) subsurface damage. The last factor creates a condition for "corrosive-wear" in which the damaged layer is worn with ease exposing a new surface and perpetuating the cycle of corrosion and wear. Central to the simulation of in vivo corrosive-wear is the recreation of the subsurface damage layer. To produce this layer in water, artificial saliva, and in media of low pH is time-consuming, because the degradation process in these environments is extremely slow. In laboratory wear tests using aqueous environments, the contact time of resin composites with water is too short to cause significant internal degradation. Thus, data obtained from such tests represent abrasive and not corrosive-wear, and do not correlate well with in vivo wear data. In considering this limitation of the above media for accelerated wear tests, an alkaline medium has been used in this study to simulate corrosive-wear of eleven commercial composites. The procedure consists of exposing each material to 0.1 N NaOH at 60 degrees C for 2 weeks followed by abrasion in a tooth brushing machine. The medium choice is based on the rationale that in vivo degradation arises from reaction with the OH(-), and this reaction can be enhanced by raising the pH and the temperature of the medium. The warm NaOH solution satisfies both these conditions. Parameters examined to evaluate the resistance of each composite to corrosion and wear were (1) mass loss, (2) Si-loss, (3) degradation depth, and (4) wear depth, respectively. A highly significant correlation has been observed among various corrosion and wear parameters. SEM examination indicated degradation to be associated with interfacial separation, filler dissolution, matrix cracking, and subsurface damage. These features are characteristics of in vivo worn composite restorations. Time is of utmost importance in laboratory evaluation of restorative materials. The ability of NaOH to meet this expediency and to mimic the in vivo degradation process makes it a useful medium for corrosive-wear studies of dental composites.

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“…Leprince et al [7] hypothesized that low molecular mass radicals may terminate trapped species by recombination or disproportionation. In line with this hypothesis, Lee et al [13,14] proposed that hydroxyl radicals could be released by hydroperoxidation of the methacrylated double bonds. If this hypothesis is valid, spin-trapping experiments are required to detect the hydroxyl radicals.…”

Section: Introductionmentioning

confidence: 91%

“…Lee et al hypothesized that OH Å production could explain the chemical degradation of dental composites stored in a food simulating environment (water/ethanol (25/75)) [13,14]. These authors proposed the hydroperoxidation of the methyl group in the position of a methacrylate group (Eq.…”

Section: Ethoxy Radicals Are Secondary Products From the Reaction Of mentioning

confidence: 98%