局限於下顎前牙內縮的矯正治療－－病例報告

Orthodontic Treatment Only on The Lower Anterior Teeth for Incisor Intrusion

近幾年骨釘被廣泛應用在矯正治療，當作短暫錨定，也被用於前牙做內縮的移動。本報告為一不常見的病例，即矯正治療只侷限於下顎前牙六顆，並沒觸及後牙。患者為60歲男性，主訴為上門牙缺失，想做植牙以恢復前牙美觀與咬合功能；然對咬的下門齒過度萌發造成深咬，干擾上門牙植牙空間，於是需要作下門齒內縮，來重獲上門牙假牙空間。由於病患下顎的後牙區全是連在一起的金屬假牙，且病人不想動它，故矯正範圍只能局限在下顎六顆前牙。骨釘被植入在兩側側門齒與犬齒之間，作前牙內縮，後面金屬牙橋則被用來防止前牙外傾，最後以9個月時間完成下顎六顆前牙矯正治療。

Recently bone screws have been used widely as Temporary Anchorage Devices (TAD'S) in various orthodontic treatments including intrusion of anterior teeth. Here we would like to present an uncommon case report of anterior segmental orthodontic treatment without involving the posterior teeth. A 60 year old male patient reported to our hospital with the complaint of missing maxillary anterior teeth. He wants to restore his function and esthetic with dental implants. However the over eruption of lower anterior teeth interferes with the space needed for upper implants; hence we decide to intrude mandibular incisors. The patient had all metal crown & bridge on all his lower posterior teeth which he didn't want to be disturbed. Therefore the orthodontic treatment was limited only to the lower six anterior teeth. The TAD'S were placed interdentally between the lower lateral incisor& lower canine on both sides for incisors intrusion. The posterior metal crown & bridge was used for avoiding the proclination of incisors. It took 9 months to finish the orthodontic treatment over the mandibular anterior teeth.