Calcification of intraocular implant lens surfaces.
Calcification of octacalcium phosphate [Ca8H2(PO4)6 x 5H2O, OCP] on differently packaged "Ultem" and "Surefold" intraocular implant lens surfaces has been studied in vitro in solutions supersaturated with respect to OCP at pH = 7.10 and 37 degrees C. No mineral deposition was observed on the lenses packaged in Ultem vials even after treatment with behenic acid, one of the fatty acids identified on explanted lenses. Following treatment with behenic acid, nucleation of OCP occurred on the lenses from Surefold vials, which incorporate silicone gaskets; induction periods preceding calcification were about 6 h. No mineralization was found on the lenses in vials with other gasket materials, including polytetrafluoroethylene, fluorocarbon elastomer, and polypropylene. The results of this study indicate that both silicone and fatty acids such as behenic acid play important roles in inducing the in vivo calcification of OCP on IOL lenses; all of the lens treatment steps were necessary for nucleation induction.
Wu
Wenju
W
Chemistry Department, Natural Sciences Complex, The State University of New York, Buffalo, New York 14260, USA.
Guan
Xiangying
X
Tang
Ruikang
R
Hook
Daniel
D
Yan
Wenyan
W
Grobe
George
G
Nancollas
George H
GH
D000180:Acrylic Resins; D001672:Biocompatible Materials; D002130:Calcium Phosphates / Q000737:chemistry*; D005227:Fatty Acids / Q000737:chemistry; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D006863:Hydrogen-Ion Concentration; D007908:Lens, Crystalline / Q000737:chemistry; D007909:Lenses; D007910:Lenses, Intraocular; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D013997:Time Factors
D000180:Acrylic Resins; D001672:Biocompatible Materials; D002130:Calcium Phosphates; D005227:Fatty Acids; D008768:Methylmethacrylates; C022045:octacalcium phosphate; C021302:hydroxymethylmethacrylate; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D019904:Polymethyl Methacrylate; C020243:calcium phosphate; C007547:behenic acid