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Metal Ion Released from Old Prostheses May Affect Oral Lesions: A Pilot Study

  • Ju, Hye-Min (Department of Oral Medicine, Dental Research Institute, Pusan National University Dental Hospital) ;
  • Kim, Ji-Su (Department of Oral Medicine, Dental Research Institute, Pusan National University School of Dentistry) ;
  • Ahn, Yong-Woo (Department of Oral Medicine, Dental Research Institute, Pusan National University School of Dentistry) ;
  • Ok, Soo-Min (Department of Oral Medicine, Dental Research Institute, Pusan National University School of Dentistry) ;
  • Jeong, Sung-Hee (Department of Oral Medicine, Dental Research Institute, Pusan National University School of Dentistry)
  • Received : 2018.11.07
  • Accepted : 2018.12.28
  • Published : 2018.12.30

Abstract

Purpose: To investigate the correlation between the amount of salivary metal ions released from fixed prostheses and the period of restoration insertion, and to evaluate the correlation between the type and amount of metal ions in saliva and oral lesions (OL). Methods: Based on the oldest prosthesis, we divided patients into two groups: more than 5 years (n=19) and less than 5 years (n=10). Patients were also divided into two groups by another criteria: the one with the presence (n=15), and the one with absence (n=14) of OL, and the amounts of metal ions were examined. Metal ions-gold (Au), copper, cobalt (Co), chromium (Cr), nickel, zinc, aluminum, palladium (Pd), tin, and platinum (Pt)-were measured using laser ablation microprobe inductively coupled plasma mass spectrometry. Results: Significantly higher quantities of Co, Pt, and Pd ions were released in patients with fixed prosthesis of more than 5 years (p<0.05). Measurement of the average amount of salivary metal ions was performed on patients with and without OL - Significantly higher amounts of Cr, Pd and Au ions were released in patients with OL (p<0.05). Conclusions: Old prostheses (${\geq}5years$) released metal ions, and among them were Co, Pt and Pd ions more than others. Patients with OL showed significantly higher levels of ion release, especially Cr, Pd and Au. There was a positive correlation between the amount of a certain kind of released metal ions, especially Pd, and the development of OL. Salivary Pd ion released from old prostheses could affect the pathogenesis of OL; therefore, long-term follow-up is important.

Keywords

Table 1. Distribution of subjects

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Table 2. Number of dental restorations in patients

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Table 3. Mean value of salivary metal ions evaluated when patients were classified with prosthesis placement period based on 5 years (ppb)

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Table 4. Mean value of salivary metal ions with or without oral lesion (ppb)

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