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Leaching of additives and degradation products from cold-cured orthodontic resins.

Acta odontologica Scandinavica (1994-06-01)
H Lygre, K N Klepp, E Solheim, N R Gjerdet
ABSTRACT

Unstimulated saliva was collected from orthodontic patients and subjected to combined gas-chromatography and gas-chromatography/mass-spectrometry analyses. Saliva was collected before insertion of removable orthodontic appliances made of cold-cured resins. Saliva was then collected 1-2 months after insertion of the appliances and 1 week after they had been removed. Phenyl benzoate (PB) and phenyl salicylate (PS) were identified in pooled saliva samples from patients wearing the appliances. Biphenyl and 2-methoxy-4-hydroxy-benzophenone in addition to PB and PS were identified in a study with in vitro specimens made of orthodontic resin. The leaching of compounds from these test specimens processed by a powdering technique and a pre-mix technique was compared.

MATERIALS
Product Number
Brand
Product Description

Supelco
Mettler-Toledo Calibration substance ME 30034252, Phenyl salicylate, traceable to primary standards
Sigma-Aldrich
Biphenyl-4-carboxylic acid, 95%
Supelco
Phenyl salicylate melting point standard, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Phenyl salicylate, ≥99%, FG
Sigma-Aldrich
Phenyl salicylate, ReagentPlus®, 99%