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The purpose of this study was to clarify the relationship between the frequency of Gram-negative anaerobic black-pigmented rods and periodontal disease-inducing occlusal trauma. The occlusal trauma group had a markedly higher level of gingival exudates and higher numbers of bacteria in gingival exudates than the normal control group. The rate of total numbers of bacteria against a definite amount of gingival exudates were found remarkably higher in all subjects with occlusal trauma than normal controls. Facultative anaerobes showed the highest frequency, in which the Gram-positive coccamount isolation rate of bacteria was predominant in all subjects. The frequency of obligate anaerobes increased in the group with occlusal trauma. The frequency of obligate anaerobic Gram-negative rods was observed to have no significant difference between occlusal trauma and normal control groups. All obligate anaerobic Gram-negative black-pigmented rods in the periodontal pockets isolated from patients with occlusal trauma and normal controls were identified with Prevotella intermedia by a biochemical test. Prevalence of obligate anaerobic Gram-negative black-pigmented rods isolated from occlusal trauma maintained a low level throughout the experimental period. These results indicate that alveolar bone loss in occlusal trauma may have no relation to obligate anaerobic Gram-negative black-pigmented rods.

Microbial Flora in Periodontal Pockets Involved with Occlusal Trauma.