以改良式Quad-Helix治療單側後牙錯咬：病例報告

Treatment of a Unilateral Posterior Crossbite Using Modified Quad-Helix : Case Report

邱俐禎(Li-Jhen Ciou) ； 林瑩澤(Yng-Tzer Lin)

《臺灣兒童牙醫學雜誌》 20卷3期 (2020/09) Pp. 155-161

https://doi.org/10.6319/TJPD.202009_20(3).0024

摘要

後牙錯咬為上下顎牙弓間的橫向差異，其中一個或多個上顎後牙顎側咬頭沒有對咬在下顎中央窩上。在乳牙和混和齒列的後牙錯咬發生率約8-22%，單側多於雙側。有些單側的後牙錯咬來自於上顎牙弓過於窄縮，在咬合時下顎會有功能性偏移，長時間可能導致顎骨發育異常。常見的治療方式有快速上顎擴張器（rapid palatal expansion）、慢速上顎擴張器（slow expansion）如Quad-helix或removable expansion plates等、修磨有咬合干擾之牙齒（grinding）和複合樹脂冠蓋體（composite onlay）這幾種治療方式。本病例報告一位6歲男孩其左側後牙錯咬，以改良式Quad-helix進行治療。經7個月，改正後牙錯咬後以活動式維持器固位，後續1年的追蹤咬合仍然穩定，無再次復發。

關鍵字

阻單側後牙錯咬 ； 改良式Quad-helix

並列摘要

The posterior corssbite is the transverse discrepancy between maxillary and mandibular arches, in which the palatal cusps of upper posterior tooth do not occlude onto the central fossa of the lower tooth. The incidence of posterior crossbite of deciduous dentition and mixed dentition is about 8-22%, and the occurrence of unilateral crossbite is more than bilateral crossbite. Some unilateral posterior crossbites are caused by the narrowing of the maxilla. The mandible has functional disturbance and displacement during occlusion, which may cause abnormal development of jaw bone. Treatment methods include rapid palatal expansion, slow expansion such as Quad-helix or removable expansion plates, grinding and composite onlay. We presented a 6-year-old boy who was diagnosed as unilateral posterior crossbite and treated with a modified Quad-helix. After 7 months, the posterior crossbite had been successfully corrected. Removable retainer was given for preventing relapse. After 12 months of follow-up, the occlusion is stable without relapse.

並列關鍵字

unilateral posterior crossbite ； modified Quad helix