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CHAPTER III.
CAVITY PREPARATION. (GENERAL CONSIDERATIONS.)
Definition of Cavity Preparation. Cavity preparation is that term
applied to those mechanical procedures upon a tooth, looking to
the making of a filling, as well as those changes and extensions
necessary to resist stress and prevent a recurrence of decay.
Affected Dentine is dentine which has been acted upon by the
lactic acid in advance of the micro-organisms of caries.
Infected Dentine is dentine which has been penetrated by micro-
organisms.
Objects in Filling Teeth. There are four general objects in view
in the filling of teeth
First.—To arrest the loss of tooth substance.
Second.—To prevent recurrence of caries.
Third.—To restore full tooth contour.
Fourth.—To improve the primary conditions as to the perform-
ance of function and esthetic effects.
A Completed Cavity should be a combination of flat walls com-
ing together at definite angles, surrounded by an external line made
up of the largest curves permissible.
The Line Angles within a cavity, Avhich are a necessary part of
resistance and retention forms, should never be pej-mitted to end
in the external enamel line.
Order of Procedure. To simplify the preparation of all cavities
and to insure the observance of certain fundamental principles it
is well to follow a definite order of procedure. This will greatly
facilitate the operations of the student and lead to the establish-
ment of habits bj^ the practitioner which will stand for thorough
methods of execution.
The following would seem to be the natural order:
First.—Gain access.
Second.—Outline form.
Third.—Resistance form.
Fourth.—Retention form.
Fifth.—Convenience form.
Sixth.—Removal of remaining decay.
Seventh.—Finishing of enamel walls.
Eighth.—Toilet of the cavity.
29
CHAPTER III.
CAVITY PREPARATION. (GENERAL CONSIDERATIONS.)
Definition of Cavity Preparation. Cavity preparation is that term
applied to those mechanical procedures upon a tooth, looking to
the making of a filling, as well as those changes and extensions
necessary to resist stress and prevent a recurrence of decay.
Affected Dentine is dentine which has been acted upon by the
lactic acid in advance of the micro-organisms of caries.
Infected Dentine is dentine which has been penetrated by micro-
organisms.
Objects in Filling Teeth. There are four general objects in view
in the filling of teeth
First.—To arrest the loss of tooth substance.
Second.—To prevent recurrence of caries.
Third.—To restore full tooth contour.
Fourth.—To improve the primary conditions as to the perform-
ance of function and esthetic effects.
A Completed Cavity should be a combination of flat walls com-
ing together at definite angles, surrounded by an external line made
up of the largest curves permissible.
The Line Angles within a cavity, Avhich are a necessary part of
resistance and retention forms, should never be pej-mitted to end
in the external enamel line.
Order of Procedure. To simplify the preparation of all cavities
and to insure the observance of certain fundamental principles it
is well to follow a definite order of procedure. This will greatly
facilitate the operations of the student and lead to the establish-
ment of habits bj^ the practitioner which will stand for thorough
methods of execution.
The following would seem to be the natural order:
First.—Gain access.
Second.—Outline form.
Third.—Resistance form.
Fourth.—Retention form.
Fifth.—Convenience form.
Sixth.—Removal of remaining decay.
Seventh.—Finishing of enamel walls.
Eighth.—Toilet of the cavity.
29
