咬合性外傷の臨床症状と歯根膜腔のMRI所見との関連性

Association between clinical manifestations of occlusal trauma and magnetic resonance imaging findings of periodontal ligament space.

抄録

目的:

本研究の目的は、歯の咬合性外傷の臨床症状とMRIにおける歯根膜腔の最大信号強度との関連を評価することである。

OBJECTIVES: The purpose of this study was to evaluate the association between clinical manifestations of occlusal trauma of the teeth and maximum signal intensity of periodontal ligament space on MRI.

方法:

20名の被験者（男性：9名、女性：11名、平均年齢：35.9±14.0歳、範囲：22～65歳）が本研究に参加した。ブラキシズムの自覚症状、歯の動揺性、フリーミタス、咬合接触面積、咬合力、歯根膜腔の拡大、硬膜の肥厚を咬合性外傷の臨床症状と定義した。臨床的咬合性外傷の程度を評価するために、臨床的咬合性外傷の総数を用い、7点を最高度の咬合性外傷とした。歯根膜腔の最大信号強度を特異的重み付けMRIシーケンスで評価した：IDEAL画像。

METHODS: 20 subjects (males: 9, females: 11, mean age: 35.9 ± 14.0 years, range: 22-65 years) participated in this study. Subjective symptoms of bruxism, tooth mobility, fremitus, occlusal contact area, occlusal force, widening of the periodontal ligament space, and thickening of the lamina dura were defined as clinical manifestations of occlusal trauma. The total number of clinical manifestations was used to evaluate the degree of clinical occlusal trauma, with a score of 7 indicating the highest degree of occlusal trauma. The maximum signal intensity in the periodontal ligament space was evaluated by a specific weighted MRI sequence: IDEAL image.

結果:

臨床的咬合性外傷の総スコアと歯根膜腔の最大信号強度との間のスピアマンの順位相関は、全歯で0.529、前歯で0.517、臼歯で0.396であった（すべてにおいて0.001未満）。

RESULTS: Spearman's rank correlation between the total clinical occlusal trauma score and maximum signal intensity in the periodontal ligament space was 0.529 for all teeth, 0.517 for anterior teeth, and 0.396 for molar teeth ( < 0.001 for all).

結論:

咬合性外傷の程度と歯根膜腔の信号強度との間に有意な相関が認められたことから、MRIを用いた咬合性外傷の客観的判定法の新たな可能性が示唆された。

CONCLUSIONS: A significant correlation between the degree of occlusal trauma and the signal intensity of the periodontal ligament space suggests a new potential MRI-based method for objectively determining occlusal trauma.