過蓋咬合的定義為上門牙和下門牙重疊的部分。當門牙垂直覆蓋太深時，則會造 成牙齒組織過度磨耗、疼痛、和美觀問題。本篇的病歷報告是一個24 歲的男性，主訴 是右下後牙排列不整齊。臨床檢查顯示病人前牙水平覆蓋距離為7 公厘，且垂直覆蓋 為8 公厘。矯正治療計畫為全口固定式矯正器將齒列排整齊，改善深咬，建立正確的 前牙垂直和水平覆蓋距離。矯正治療費時約三年且治療結果顯示臉部外觀的改善及一 級咬合關係都已達成。早期對於過度的深咬有正確的診斷和治療，可降低牙齒外傷和 牙周破壞發生的機率，促進牙周健康。

An overbite is the overlap of the top teeth over the bottom teeth. A deep overbite can cause problems such as excessive wear, pain and aesthetic concerns. This case reports a 24-year-old male complaining of malalignment of the anterior teeth. The orthodontic evaluation revealed that the overjet was up to 7 mm and overbite was attained at 8 mm. The treatment plans include applying full mouth fixed appliance, reducing deep overbite, correcting the two lingualized mandibular premolars, and establishing an anterior vertical stop. The whole treatment took about 3 years to complete. The maxillary and mandibular arches were aligned very well. Adequate overbite and overjet were achieved while maintaining the Class I molar and canine relationships. Diagnosis and treatment of excessive vertical overlap at an early age can reduce the prevalence of traumatic tooth and adjacent periodontal tissues. Methods of treatment should be evaluated with care.