Lectures on operative dental surgery and therapeutics . bserved that the pressure graduallydiminishes from the posterior to the anterior part of themouth, the distribution being more especially upon themolars, decreasing on the bicuspids and canines, while theincisors, in consequence of the superior arch being largerthan the inferior, do not occlude, but are held in closejuxtaposition at such a distance, and so far overlapping,as to endow them with the cutting capacity from whencetheir name is derived. The part taken by the molars insustaining the integrity of the articulation must ever be 161
Image details
Contributor:
The Reading Room / Alamy Stock PhotoImage ID:
2AM40YRFile size:
7.2 MB (403.3 KB Compressed download)Releases:
Model - no | Property - noDo I need a release?Dimensions:
1835 x 1362 px | 31.1 x 23.1 cm | 12.2 x 9.1 inches | 150dpiMore information:
This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.
This image could have imperfections as it’s either historical or reportage.
Lectures on operative dental surgery and therapeutics . bserved that the pressure graduallydiminishes from the posterior to the anterior part of themouth, the distribution being more especially upon themolars, decreasing on the bicuspids and canines, while theincisors, in consequence of the superior arch being largerthan the inferior, do not occlude, but are held in closejuxtaposition at such a distance, and so far overlapping, as to endow them with the cutting capacity from whencetheir name is derived. The part taken by the molars insustaining the integrity of the articulation must ever be 161 remembered, as disease referred to the incisors may reallybe caused by the loss, from abrasion, of the crowns of themolars and bicuspids. Gradually the antagonising powerof the molars decreases, while, in the same proportion, thespaces between the cutting edges of the incisors diminishuntil they impinge upon each other. A similar conditionto the above is shown in Fig. 64, in which it will be ob-served that, in the molars and bicuspids of the inferior. Fig. 65. a. Left superior central (outlined tooth). h. Cross etching, denoting the extent to which the canine and bicus-pids were built. maxilla, great loss ot substance had occurred. This gap, so apparent on the diagram, could only be evidencedwhen the incisors were, by extraneous means, held at theircorrect distance. Although the teeth now under considera-tion were so much abraded, they were still firmly fixed intheir sockets; but to provide an interposing substance wasan imperative and immediate necessity, as the nervous 162 system had become seriously affected by the disarrange-ment of the whole articulation. The abraded organs, with their tablelike crowns, cameunder the description where no walls remain to build upon, and in which special anchorages, or retaining points andgrooves, would have to be devised. This is illustrated in the following enlarged diagram-matic section : a a. Keying rim. h b. External bevel, built over. d