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This study considered correlation by oral malodor components and examined the amount and activities of oral microorganisms within dental plaque and saliva and their correlation with occurrence of oral malodor in 127 adult volunteers (74 males and 53 females) in their twenties to forties who agreed on the purport of this study among those who visited the preventive dental clinic of D University Dental Clinic from October 23, 2006 to August 30, 2007.
As for correlation among oral malodor components, there was correlation between sulfureted hydrogen and methyl mercaptan, between methyl mercaptan and dimethyl sulfide, and between hydrogen sulfide and ammonia (r=0.1923, p=0.03), with relatively high correlation between methyl mercaptan and dimethyl sulfide (r=0.2476, p=0.005).
As for correlation between the amount of bacteria observed in 100 magnifications and each of oral malodor gas components, there was significantly high correlation between soil bacilli and ammonia gas (r=0.4131, p=0.003).
As for correlation between the amount of oral microorganisms by shapes and each of oral malodor gases observed in 600 magnifications, there was correlation between the amount of soil bacilli and ammonia gas (r=0.3261, p=0.022) and between the amount of spirilla and sulfureted hydrogen (r=0.3119. p=0.029).
As for correlation between activities of oral microorganisms by shapes and oral malodor components observed in 100 magnifications by a phase-contrast microscope, there was very remarkable correlation between activities of soil bacilli and occurrence of ammonia gas (r=0.4813, p=0.000).
To put together the general amount and activities of oral microorganisms, correlation between bacterial activities and ammonia gas was recognized only when observed in 100 magnifications (r=0.4181, p=0.003).
Of oral microorganism factors, in general, the amount and activities of soil bacilli and the amount of sulfureted hydrogen were found to make great contributions to occurrence of sulfureted hydrogen and ammonia.