orthodontist
词根词缀：
orthodontics n. 畸齿矫正学
ortho 直，正 + dont〔= odont 牙齿〕+ ics …学 → 畸齿矫正学
orthodontist n. 正牙医生
ortho 直，正 + dont 牙齿 + ist 从事某职业的人 → 正牙医生
orthodox adj. 正统的
ortho 直，正 + dox 教，观点 → 正统观点的 → 正统的
orthopedic adj. 整形外科的
ortho 直，正 + ped 儿童 + ic …的 → 原指对畸形儿童的整形 → 整形外科的
orthopedist n. 整形外科医师
ortho 直，正 + ped 脚 + ist 人 → 整形外科医师
数据来源：新东方英语词汇速记大全
相关例句：
Discussion of the Training of an Orthodontist The Exploration of Orthodontic Clinical Compliance
口腔正畸专科医师培训刍议口腔正畸临床依从性的探讨
Today it's relatively rare for someone to have perfectly straight teeth ( without having been to the orthodontist).
所以，现在已经很难看到哪个人天生就长着一副十分完美的整齐牙齿；
In orthodontic practice, it is very usual that an orthodontist would face some female patients, who are conceiving children or want to do that during the treatment period. There also are some pregnant women who intend to seek orthodontic treatment.
临床上常有在正畸治疗期间怀孕或想怀孕的患者，亦有已怀孕的女性想寻求正畸治疗的情况。
An orthodontist in America makes about$ 2 00000 a year.
在美国，一位牙齿矫正医师的年收入大约是20万美元。
Effect of orthodontist behaviors on patient satisfaction and orthodontist-patient relationship
正畸医生行为与患者满意度和医患关系的影响
The orthodontist's office is right around the corner from his office, and he agreed that he'd schedule the appointments and take her.
牙齿校正医生的办公室就在他的办公室拐角，丈夫同意由他安排时间带她去。