Summary
Antibody levels to some periodontal pathogens are associated with enhanced levels of inflammatory markers. The purpose of the current study was to examine the relative contribution of serum immunoglobulin G (IgG) subclass antibody level factors and local factors on the probing pocket depth in chronic periodontitis. Serum samples were taken from 444 patients diagnosed with moderate and severe periodontitis and 223 control subjects. The IgG subclass antibody titers to Porphyromonas gingivalis (Pg), Aggregatibacter actinomycetemcomitans (Aa) and Tanerella forsythia (Tf) using indirect immunoassay (ELISA) were determined. The relative contribution of patient, tooth and site-associated parameters on the probing pocket depth were evaluated with a hierarchical multilevel model. The results indicated that periodontitis patients had detectable levels of IgG1 and IgG2. High IgG1 and IgG2 antibody levels against Aa occurred in 132 and 142 periodontitis patients, respectively. High IgG1 and IgG2 antibody levels against Pg occurred in 141 and 138, periodontitis patients, respectively, and High IgG1 and IgG2 antibody levels against Tf occurred in 121 and 136 periodontitis patients, respectively. The majority of the variance was attributed to the site level (48%). The multilevel analysis associated deeper probing depth with subject factors (serum IgG1 and IgG2 antibody to Pg and Aa), tooth factors (tooth type), and site factors (mesial-distal location and bleeding on probing). Elevated serum IgG1 and IgG2 antibody to Pg and Aa (subject factors) reflects destructive periodontal disease status.
KEY WORDS: IgG subclass, periodontitis, antibody, multilevel analysis.
How to cite this article
ARDILA, C. M.; GUZMÁN, I. C.; BERMUDEZ, L.; BERNAU, S.; CONTRERAS, A.; DUQUE, A.; DUARTE, S.; DE AVILA, J. & LAFAURIE, G. I. Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans IgG subclass antibody levels as immunological risk indicators of chronic periodontitis: a multilevel approach. Int. J. Odontostomat., 7(3):433-440, 2013.
