- 期刊
隱形與傳統矯正器之風險效益評估（一）
The Comparison of Risk Factors of Invisalign and Traditional Fixed Appliances (Part I)
摘要
本回顧性研究報告之目的，是探討Invisalign隱形矯正器與傳統固定矯正器之報酬對風險比的差異。矯正發炎反應所導致之牙根尖外吸收機轉，至今並未完全探索清楚，可能屬於移除透明變性區(hyaline zone)的部分過程。牙根尖外吸收的發生，可能是因矯正治療的強大力量、蝕骨細胞和破牙骨質細胞活性增加而引起之牙周膜透明變性。牙根尖外吸收達到損失牙根長度一至二毫米時，就認為有臨床意義。 牙根尖外吸收超過五毫米，約占百分之一至五的機率，屬于嚴重的狀況。牙根長度剩餘10毫米以下的極度吸收牙齒，其牙齒鬆動度，也會隨著年齡增加而增高。確實了解牙根尖外吸收的風險因子，可以協助矯正醫師如何為病患評估矯正治療計劃，為其選擇最佳治療方案，降低牙根尖外吸收的機率。
並列摘要
The aim of this review was to investigate the reward-to-risk factors between the Invisalign and traditional fixed appliances (TFA). The mechanism of EARR is not completely explored. Inflammatory root resorption induced by orthodontic treatment is a part of process of elimination of hyaline zone. It is considered that occurrence of EARR can be induced by the strong force through orthodontic treatment and hyalinization of periodontal ligaments induced by increased activity of cementoclasts and osteoclasts. EARR is considered as clinically important when 1-2 mm of the root length is lost. Severe root resorption during orthodontic treatment (more than 5 mm) occurs very rarely, just in 1-5% of patients. In teeth with extremely resorbed roots with a root length less than 10 mm, increasing mobility can be expected with age. Knowing risk factors for root resorption would help the orthodontist to assess a patient upon planning orthodontic treatment and to choose the best method for treatment.