- 期刊
隱形與傳統矯正器之風險效益評估（三）
The Comparison of Risk Factors of Invisalign and Traditional Fixed Appliances (Part III)
摘要
Invisalign透明矯正器可以治療較複雜的齒列不整病例，包括深咬、開咬、中度至嚴重水平咬覆病例、拔上顎小臼齒、骨性安格氏第二類、骨性第三類咬合不正治療及合併手術療法等。隱形矯正器移動牙齒的生物作用機轉是將整個牙冠緊密包住。牙齒能因隱形矯正器的活化而整體移位，因牙齒是堅硬的，並起碼有兩個接觸點。為了讓隱形矯正器能緊密包著牙齒以控制移動方向，常需加入附著物。力量來自於每套矯正器只活化非常小距離（0.02毫米）及其彈性，因此，它是非常輕微及連續的力量。隱形矯正器的限制包括嚴重的異位生長牙齒、有些病患的順從度不高、未完全萌出的牙齒、可能產生輕微的後牙被壓入現象、掩飾性治療可能是對嚴重骨性異常的不正咬合的一種非手術處理方式。Invisalign隱形矯正器比傳統矯正器較優的重點包括美觀、舒適、容易使用、容易清潔、較少牙根吸收、較少脫鈣、較少牙齦炎及牙周炎等。
並列摘要
Invisalign clear braces could be used successfully in a variety of complex cases, including deep and open bites, moderated-to-severe overjet, upper premolar extractions, skeletal Angle's Class II and III cases, and combined with surgical corrections. The biomechanics of tooth movement of the Invisalign system involved with the greater surface area of the entire crown is tightly held with no space between the appliance and the tooth. The activation in the appliance can then move the tooth bodily because the tooth is rigid body, and at least two points of contact are in play. However, for the appliance to fit tightly to more teeth in the desired direction, it may be necessary to add attachments. The force involved for the 0.02 mm activations are most likely of a light, continuousl nature due to the elastic properties of the appliance and the small magnitude of individual activation at each stage. The limitations of the Invisalign system associated with some the following factors. Severely and ectopically positioned dentition, non-compliance, insufficient wearing or missing of the appliances, slight posterior tooth intrusion, camouflage treatment for malocclusion with significant skeletal displasia might be the non-surgical treatement options. Aligners offer several advantages over traditional fixed appiances including excellent esthetic during treatment, comfort of wear, ease of use, ease of clean, less EARR, less decalcification, less gingivitis and periodontitis, and others.