Dental surgery notes / by Ernest B. Dowsett.

  • Dowsett, Ernest B. (Ernest Blair)
Date:
1909
Catalogue details

Licence: In copyright

Credit: Dental surgery notes / by Ernest B. Dowsett. Source: Wellcome Collection.

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    Method of Growth of the Mandible 1. In Length. Alveolar process and jaw made longer by absorption in front of coronoid process, and deposition of bone on posterior aspect of vertical ramus, from the condyle to angle of the jaw, actual observa- tion of which can be seen. 2. In Height. Jaw deepens vertically by alveolar process growing upwards with the teeth :— a. With temporary teeth (some of this ab- sorbed). b. With permanent teeth. Also before age of 7 years, jaw deepens slightly by deposition of bone on base of jaw. Above can be proved by comparing sagittal sections of jaws of varying ages. Taking the inferior dental canal as the fixed point, it will be seen that up to 7 years the bone is deposited above and below the level of the canal, and after that age only above the canal, which remains after 7 years at an un- varying distance from the base of the jaw. 3. In Thickness. Posterior plate of mandible remains unchanged, growth going on by bone thickening from within outwards. This is known by the following measurements, &c.:— a. If a jaw of a 9 months’ fcetus be placed over an adult jaw, it will be seen that the inside arches of both are the same. (This is a rough-and-ready method of showing that the jaw grew in thickness by deposition of bone on the outside.)
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