Operative Dentistry �
Done By
D. Worood Hashim AL_Ameedy
Operative Dentistry
The placement of a restoration in a tooth requires the dentist to practice biology and uses principles of mechanical engineering and highly developed skill and artistic abilities.
Proximal:
The surface of the tooth or the portion of the cavity that is nearest to the adjacent tooth ( the mesial or distal surface of a tooth).
Cervical:
It’s related to the surface or the neck of the tooth.
Gingival:
It’s close to the gingiva.
Cavity Preparation:
It is the performance of these dental surgical procedure required to expose the caries lesion and permanent removal of the effected tissue and to shape the remaining dentine and enamel as to contribute to a mechanically and biologically sound restoration.
Definitions related to the Component of cavity preparation
( most cavities they have the general form of Box)
Cavity floor (Seat):
It is the base enclosing side of the prepared cavity ( only related to the pulpal and gingival floor and seat) and this floor is horizontally oriented.
Cavity Wall:
It’s one of the enclosing sides of the prepared cavity it takes the name of the structure of the tooth adjoining the surface involved and toward which it is placed ex: the buccal wall of occlusal cavity it is that enclosing side which is toward the buccal surface of tooth.
Axial Wall:
It is an internal cavity surface lying in the direction of the long axis of the tooth ( in relation to the pulp).
Pulpal Wall:
It is an internal cavity surface lying in horizontally in relation to the pulp, oriented perpendicular to the long axis of the tooth.
Line angles:
An angle formed by the junction of two walls along a line, described by combining the name of the walls forming the angle.
Ex: 1- Axio-pulpal line angle.
2- Bucco-axial line angle.
3- Gingivo-axial line angle.
Point angle:
An angle formed by the junction of three walls at a common point; designated by combining the names of the walls forming the angle.
Ex: Mesio-lingo-pulpal point angle.
Undercut:
(a)-The portion of a prepared cavity confined by walls which converge below the surface arch.
(b)- A localized channel within a cavity preparation (Not liner)
Margin:
The junction of the wall of the cavity with the surface of the tooth(cavo-surface).
Bevel
The inclination that one line or surface makes with another when not at right angles; in cavity preparation a cut that produce an angle of more than 90 degree than with a cavity wall.
Enamel Wall:
That portion of the prepared cavity wall consisting of enamel.
Dentinal Wall:
That portion of the prepared cavity wall consisting of dentine and often containing retention forms
Embrasures:
V-Shaped spaces between the curved proximal surfaces of the teeth that originate at the proximal contact areas between adjacent teeth and are named for the direction toward which they radiate.
Ex: 1- gingival embrasure( closest to the gingival)
2-Occlusal embrasure( closest to the occlusal surface)
3- Lingual embrasure.
4- Buccal or labial embrasure.
*Tooth preparation walls:
Buccal(f),of proximal and occlusal portions,gingival(g), lingual(I) of proximal and occlusal portions, distal(d), pulpal(p). and axial(a).
Tooth preparation line angles and point angles:
Line angle are: distobuccal (df), buccopulpal (fp), axiobuccal (af), buccogingival (fg), axiogingival (lg), axiolingual (al), axiopulpal (ab), lingopulpal (lp)distolingual (dI), and distopulpal (db).
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