國人III級異常咬合的組成因素

Components of Class III Malocclusion in Chinese

張宏博(Hong-Po CHANG)

《The Kaohsiung Journal of Medical Sciences》 1卷3期 (1985/03) Pp. 144-155

https://doi.org/10.6452/KJMS.198503.0144

摘要

65位兒童與72位成人III級異常咬合者以及70位成人正常咬合者的側方測顱X光片資料，經描圖後，以數字轉換儀輸入電腦運算，分析下述四組測量值：上顎骨位置，上顎牙齒位置，下顎牙齒位置，下顎骨位置以及垂直顏面發育，除此以外，也研完上、下顎骨骼關係與上、下顎牙齒關係。
重要的結論可摘要如下：
1.III級異常咬合並非單一的病症，可由許多異常骨骼牙齒因素的組成產生。
2.成人III級異常咬合的異常因素最多見的組成是上顎骨正位，上顎門齒前突，下顎門齒後縮，下顎骨前突，且前下顏面部適中者。
3.一般而言，III級異常咬合的面部有明顯的水平長相，容易因生長而變成更下顎前突。
4.III級異常咬合牙齒因素的異常似乎是對顎骨基底差距的補償作用。
5.III級異常咬合隨著生長發育，下顎骨向前的生長超過上顎骨，上顎門齒前傾與下顎門齒後傾的程度隨之加劇。
6.III異常咬合成人群的下顎下緣平面比兒童群顯著較為平坦。
7,兒童III級異常咬合群男、女兩性的齒列顏面形態極盡相似，無明顯的兩性二形。
8.男、女兩性成人班級異常咬合群齒到顏面形態，雖有大小的不同，但也極為相似，無顯著的兩性二形。

並列摘要

Lateral cephalometric radiographs of 65 children and 72 adults with Class III malocclusion and 70 adults with normal occlusion were traced. The tracings were digitized, and the following sets of measurements were analyzed : maxillary skeletal position , maxillary dental position, mandibular dental position, mandibular skeletal position , and vertical facial development . In addition, the maxillo-mandibular skeletal and dental relations were also studied.
The main conclusions are summarized as following :
1. Class III malocclusion 15 not a single clinical entity. It can result from numerous combinations of aberrant skeletodental components.
2. The most common combination of variables in adult Class III malocclusion was a neutral maxilla, protrusive maxillary incisors, retrusive mandibular incisors, a protrusive mandible, and a neutral lower anterior facial height.
3. A Class III face generally showed a do-mint horizontal direction and tended to become more Class III with growth.
4. The differences in the dental variables appear to be compensatory responses to the anteroposterior dysplasias of the apical bases in Class III malocdusions.
5. As growth in Class III malocclusions carried the mandible more forward , the anteroposterior dysplasias of the apical bases were generally increased , the lower incisors more retroclined, and the upper incisors more proclined.
6. Much effective growth rotation appeared to take place, since the mandibular planes in adults changed less steeply.
7. The craniofacial patterns between male and female children with Class III malocclusion tended to be similar.
8. Even though a significant size discrepancy of vertical facial dimension was shown between male and female adults with Class III malocclusion , the craniofacial patterns tended to be similar too.

並列關鍵字

Angle Class III malocclusion ； skeletodental variables ； combinations of components