In vitro sorption of IgG to cementum

D. H. Fine, J. M.A. Wilton, C. Caravana

Research output: Contribution to journalArticlepeer-review


The nature of the interaction between root surfaces and gingival fluid proteins has not been studied. Therefore, a series of in vitro investigations were undertaken to develop an assay to determine sorption of prominent gingival fluid proteins to the cementum. In initial studies extracted teeth were immersed in various concentrations of whole human serum and incubated with rabbit anti‐IgG, IgA, IgM, and C3 followed by anti‐peroxidaseperoxidase bridging reagents. Of the proteins analysed IgG sorbed to the highest degree in gross and microscopic evaluations. Remaining studies focused on quantifying IgG sorption, and thus root segments of known surface area were prepared and immersed in 125I‐IgG. Sorption of IgG was calculated as 21.5 ± 0.27 ng/mm2 when IgG was added at concentrations found in gingival fluid. Root fragments immersed in non‐IgG human serum reconstituted with specific amounts of 125I‐IgG, sorped only 3.4 ± 0.9 ng/mm2 of IgG, and direct measurement of IgG sorption in whole serum by the ELISA method gave comparable results. Moreover, pre‐coating of root segments with non‐IgG serum followed by incubation with 125I‐IgG resulted in 74% inhibition of IgG binding. Results suggest that serum protein sorption to root surfaces can be quantitated and may be non‐specific and concentration dependent with respect to IgG.

Original languageEnglish (US)
Pages (from-to)445-456
Number of pages12
JournalJournal of Periodontal Research
Issue number5
StatePublished - Sep 1984

All Science Journal Classification (ASJC) codes

  • Periodontics


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