Angle Orthod. 2017 Jul;87(4):598-602. doi: 10.2319/110116-786.1. Epub 2017 Apr 4.
To evaluate the buccolingual inclinations of maxillary and mandibular first molars in untreated adults.
Fifty-nine subjects (14 males and 45 females; mean age, 41.2 years) with no missing teeth, no crossbite, and minimal crowding were included. For each subject, a CBCT was taken. The long axis of each first molar was determined, and the inclination of each molar was measured using the long axis and the floor.
One hundred seventeen out of 118 mandibular first molars measured had a lingual inclination, with a mean of 12.59° ± 5.47°. For the maxillary first molars, 107 out of 118 had a buccal inclination, with a mean of 4.85° ± 4.22°.
There is a curvature to the inclinations of first molars in untreated adults, where the maxillary molars have a slight buccal inclination and mandibular molars have a slight lingual inclination.
评估未经治疗的成年人上颌和下颌第一磨牙的颊舌向倾斜度。
59 名受试者（14 名男性和 45 名女性；平均年龄 41.2 岁），无缺牙、无反颌、轻度拥挤。对每位受试者进行 CBCT 检查。确定每个第一磨牙的长轴，并使用长轴和牙合平面测量每个磨牙的倾斜度。
118 颗下颌第一磨牙中，有 117 颗有舌向倾斜，平均倾斜度为 12.59°±5.47°。上颌第一磨牙中，有 118 颗有颊向倾斜，平均倾斜度为 4.85°±4.22°。
未经治疗的成年人的第一磨牙倾斜度存在一定的弯曲，上颌磨牙有轻微的颊向倾斜，下颌磨牙有轻微的舌向倾斜。
