Practical Orthodontia
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In our eReader you can find the full English version of the book. Read Practical Orthodontia Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Practical Orthodontia
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We must keep in mind the various shapes of the teeth, especially the lower premolars ; also the position that they occupy in the arch.
Fig. 411 shows the different shapes of the mandibular second pre- molars. They are illustrations made from a skull and model in the author's possession. The lower second premolar with three cusps is not so rare as might be supposed and each cusp has a definite occlu- sion.
Fig. 411. — Different shapes of mandibular premolars, which must be considered in retentio...n.
We must also take into consideration the fact that the lower premo- lars do not occupy the same angle of inclination as do the upper pre- molars (Fig. 412). A line drawn through the buccal and lingual cusps of the upper premolars would nut be parallel to one passing through the lower premolars. The line from the lower premolars would cross with the apex of the angle to the lingual of the teeth. It is the au- thor's opinion that in a great many cases, the lingual cusp of the lower first premolar has been moved too far mesially in the attempt to get it parallel with the upper.
What to read after Practical Orthodontia?
You can find similar books in the "Read Also" column, or choose other free books by Dewey, Martin, 1881-1933 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
We must keep in mind the various shapes of the teeth, especially the lower premolars ; also the position that they occupy in the arch.
Fig. 411 shows the different shapes of the mandibular second pre- molars. They are illustrations made from a skull and model in the author's possession. The lower second premolar with three cusps is not so rare as might be supposed and each cusp has a definite occlu- sion.
Fig. 411. — Different shapes of mandibular premolars, which must be considered in retentio...n.
We must also take into consideration the fact that the lower premo- lars do not occupy the same angle of inclination as do the upper pre- molars (Fig. 412). A line drawn through the buccal and lingual cusps of the upper premolars would nut be parallel to one passing through the lower premolars. The line from the lower premolars would cross with the apex of the angle to the lingual of the teeth. It is the au- thor's opinion that in a great many cases, the lingual cusp of the lower first premolar has been moved too far mesially in the attempt to get it parallel with the upper.
What to read after Practical Orthodontia?
You can find similar books in the "Read Also" column, or choose other free books by Dewey, Martin, 1881-1933 to read onlineMoreLess
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