Operative technics; a convenient reference and manual for practitioners and students of dentistry - Brossura
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...cavities the bottom or floor of the cavity, either the axial or pulpal wall. Step.--The auxiliary portion of the compound mortise form, consisting of the axial and pulpal walls in complex cavities. (c) Retention Form.--The so shaping of the cavity that the filling may be enabled to resist tipping or lifting stress. (1) In pit and fissure and gingival third cavities, where the depth of the cavity is greater than its diameter, no extra retention form is needed, the filling being retained by its contact with the lateral walls of the cavity. The accomplishment of this condition, though, is not often admissible, owing to the proximity of the pulp. In the majority of cases, then, retention is provided for by transforming the simple mortise form into the dovetail mortise form (Fig. 136). In doing this, one, or at most two, opposite walls of the cavity are slightly dovetailed. (2) In proximal cavities on incisors and cuspids not involving the angle, retention is provided for by making more acute the labio-gingivo-axial, lingo-gingivo-axial and the incisal point angles (Figs. 154 and 156). (3) In proximal cavities on incisors and cuspids involving the angle, the gingival and incisal point angles are deepened as in "(2)," for the simpler cases. In the incisal step form, the entire step, which has been given a flat floor, is dovetailed on its labial and lingual walls, and slightly deepened at its extremity (Figs. 159 and 164). In the lingual step form the step is dovetailed throughout, and its two point angles rendered more acute (Fig. 160). (4) In proximo-occlusal cavities on bicuspids and molars the gingival point angles are rendered more acute in both the simple mortise form and the compound mortise form (Figs. 145, 162 and 163). The simple mdrtise form i...
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