The effects of sodium fluoride and stannous fluoride on the surface roughness of intraoral magnet systems.
Four types of intraoral magnets used for retention of overdentures and maxillofacial prostheses were exposed in vitro to SnF2 and NaF to determine the effects of fluoride rinses on surface roughness. The surface roughness (Ra) was measured, after simulated 1, 2, and 5 years' clinical exposure to fluoride (31, 62, and 155 hours). The mean change in Ra was calculated for each period of simulated exposure to fluoride for each magnet type. Two-way ANOVA was used to compare mean change in Ra between magnets within fluorides, and between fluorides within magnets. Paired t tests were used to compare mean change in Ra within fluorides within magnets. The mean change in Ra increased for all magnets after simulated 1, 2, and 5 years of exposure to SnF2 and NaF (p less than 0.03). Using the change in Ra as an indicator for corrosion, PdCo encapsulated SmCo5 magnets and their keepers demonstrated the least corrosion with either fluoride.
Obatake
R M
RM
Department of Dental Oncology, University of Texas M.D. Anderson Cancer Center, Houston.
Collard
S M
SM
Martin
J
J
Ladd
G D
GD
D000704:Analysis of Variance; D003035:Cobalt; D003343:Corrosion; D000044:Dental Abutments; D003781:Denture Retention; D005500:Follow-Up Studies; D006801:Humans; D008280:Magnetics; D009354:Neodymium; D010165:Palladium; D012493:Samarium; D012969:Sodium Fluoride / Q000737:chemistry; D013499:Surface Properties; D014002:Tin Fluorides / Q000737:chemistry
D014002:Tin Fluorides; D009354:Neodymium; D003035:Cobalt; D012493:Samarium; D010165:Palladium; D012969:Sodium Fluoride