プロービング時の出血がないこと。歯周病の安定性を示す指標

Absence of bleeding on probing. An indicator of periodontal stability.

抄録

41 名の患者を対象とし，2 年半のメンテナンスプログラムを実施した．メンテナンス開始時に歯周組織の状態を "breeding on probing"（BOP）により評価した．再計装は，プロービングで出血した部位にのみ行った．しかし，歯肉縁上歯垢と歯石は常に除去した．また，治療後と試験終了時にポケットの深さとアタッチメントレベルを記録した．歯周病の進行は，プロービングアタッチメントが2mm以上減少したことをもって定義した．BOP 検査は，感度，特異度，精度，陽性・陰性予測値を算出し，予測因子としての信頼性を評価した．頻回出血の感度は29%にとどまったが，特異度は88%であった．また，病勢進行の陽性予測値はわずか 6％，陰性予測値は 98％であり，BOP の継続的な欠如は歯周病の健康維持のための信頼できる予測因子であると考えられた．

Following active periodontal therapy, 41 patients were incorporated in a maintenance program for 2 1/2 years with recall intervals varying between 2-6 months. At the beginning of each maintenance visit, the periodontal tissues were evaluated using "bleeding on probing" (BOP). Reinstrumentation was only performed at sites which bled on probing. However, supragingival plaque and calculus was always removed. Pocket probing depths and probing attachment levels were recorded after active treatment and at the conclusion of the study. Progression of periodontal disease was defined by an observed loss of probing attachment of greater than or equal to 2 mm. The reliability of the BOP test as a predictor was evaluated by calculating sensitivity, specificity, accuracy, and positive and negative predictive values. While only a 29% sensitivity was calculated for frequent bleeding, the specificity was 88%. The fact that the positive predictive value for disease progression was only 6% and the negative predictive value was 98% renders continuous absence of BOP a reliable predictor for the maintenance of periodontal health.