Essentials of operative dentistry by Davis Wallace Clyde 1866-

Author:Davis, Wallace Clyde, 1866-
Language: eng
Format: epub, pdf
Tags: Dentistry, Operative
Publisher: St. Louis : C. V. Mosby company

means of dryness must be used. When one of the surrounding walls is missing as in proxinio-occlusal cavities in bicuspids and molars (Class Two) the matrix must be in place. The first pellet of tin introduced should completely cover the base of cavity and be thoroughly condensed by good steady hand pressure, with points at least one square millimeter in size employing the rocking motion. The points should have deep serrations and be so stepped as to include the entire surface.

This hand pressure should be folloAved with the mallet force using a plugger point of medium serrations and the surface entirely gone over. A new pellet may now be applied and the plan just given repeated. If the filling is to be entirely of tin the cavity should be filled to excess and by a process of burnishing, condensed and rubbed to the size desired. This last method gives a surface of the greatest density possible.

Tin and Gold. When the fillhig is to be completed Avith cohesive gold little dependence should be put upon the gold adhering to the tin as the union is only slight. With a round-pointed instrument new convenience angles should be made in the substance of the tin near the line angles. The remainder of the cavity should be retentive independent of the space occupied by the tin.

Tin and Amalgam. No special care is needed when the filling is to be completed Avith amalgam. Amalgamation takes place in that portion of the tin next to the amalgam proper and the union is ([uite strong, even more than tin to tin. The amalgam should, if possible, be more thoroughly mixed and the process of kneading prolonged that all amalgamation possible be secured before contacting Avith the tin as the tin Avill take up some of the mercury from the amalgam for which it has a great affinity. This is liable to injure the amalgam as to strength unless the mixing has been thorough. The use of tin and amalgam is not advised where the surface of the tin is to be exposed by forming any portion of the contour as the presence of the mercury absorbed causes the tin to rapidly disintegrate. Gold should be used for topping in such cases.

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