Descriptive anatomy of the human teeth / by G.V. Black.

  • Greene Vardiman Black
Date:
[1897]
Catalogue details

Licence: Public Domain Mark

Credit: Descriptive anatomy of the human teeth / by G.V. Black. Source: Wellcome Collection.

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    7. The angles of the teeth are of two kinds: Line angles and point angles. The line angles are formed by the junction of two surfaces along a line. The point angles are formed by the junction of three surfaces forming a corner. The incisors and cuspids have four, and the bicuspids and molars have eight line angles. Angles are named by combining in a compound word the names of the surfaces which join to form the angle. The incisors and cuspids have mesio-labial angles, which extend from the cutting edge to the gingival line along the line of union of the mesial and labial surfaces. Also, disto-labial angles, mesio-lingual angles, and disto-lin- gual angles, formed similarly by the junction of the surfaces named in these compound words. The bicuspids and molars have mesio-buccal angles, formed by the junction of the mesial and buccal surfaces along a line from the occlusal surface to the gingival line. Also, disto-buccal angles, mesio-lingual angles, and disto-lingual angles, all of which are formed in the same manner as the mesio-buccal. These are called the axial line angles be- cause they are parallel with the long axes of the teeth. The bicuspids and molars have also four occlusal line angles, which are, however, more generally called marginal ridges. The mesio-occlusal angles extend bucco-lingually along the line of junction of the mesial and occlusal surfaces. The disto-occlusal angles are similarly formed. The bucco- occlusal angles and the linguo-occlusal angles extend mesio- distallv along the line of junction of the surfaces named in these compound words. The point angles of the bicuspids and molars are four occlusal and four gingival. As these are formed by the junc- tion of the angles of three surfaces forming a corner, their names are compounds of the names of the three uniting sur- faces. The mesio-bucco-occlusal angles are formed by the junction of the angles of these three surfaces at a point. The mesio-linguo-occlusal angles, the disto-bucco-occlusal angles, and the disto-linguo-occlusal angles are formed in a
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