歯磨剤による金属歯冠の磨耗

概要

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Abrasion of dental crown of 12% gold-palladium-silver alloy was studied experimentally to clarify the cause of dark coloring of toothbrush after brushing in case of patients with den- tal crown. The abrasion test was performed with manual brushing of dental crown with 110g load and 180cycle per minute for 10 to 30 minute. Three commercial dentifrices were tested: Ora2, Gum and White & White. The dentifrices after the abrasion test were dissolved in aqua regia followed by chemical analysis by using inductively coupled plasma analysis (ICP). With regards to gold, palladium, silver and copper, the analytical results have shown that the chemistry in the solution after brushing has been the same as that of dental alloy. This confirmed the abrasion of dental crown by brushing. The wear has increased with the increase of brushing time. The measured wear rate was the highest for Ora2 (0.011mg/min). The wear rates were much smaller for Gum and White & White. The smaller size distribution of the polisher particles, silica in case of Ora2, might cause the larger wear rate during brushing.
2004-02-28