How do you do a class 2 amalgam restoration?
Load the amalgam carrier with amalgam from the well; place the amalgam into the occlusal segment of the prepared cavity. Begin condensation using a small condenser to condense a portion of the amalgam into the proximal box area. Place pressure and condense into all line angles, as well as against the matrix band.
What is a gingival seat?
22 PREPRATION OF GINGIVAL SEAT:- It is an external cavity wall that is perpendicular to the long axis of the tooth. It is extended beyond the contact area or up to the proximal lesion whichever is more. This also help in providing a contact clearance gingivally.
Why is axial wall convex?
○ Because the axial wall follows the mesiodistal and incisogingival/occlusogingival contours of the facial surface of the tooth, it will usually be convex in both directions. flat, if we do so will not have even depth of the cavity because of convexity of tooth structure, so the axial wall should be slightly convex.
What is axial wall depth?
The axial wall is 0.5-0.8 mm into dentin. 7. The reverse curve preserves the triangular ridge and facilitates the formation of a 90 degree angle between the proximal walls and the tangent of the proximal surface. 8.
What is a Class 2 restoration?
A Class II restoration has to recreate not only the natural contour of the tooth, but also the corresponding proximal contact. Many dentists consider this point, in particular, to be the most demanding part of the treatment.
What is isthmus in amalgam restoration?
The transition between the occlusal and proximal cavity is termed isthmus. This is the narrowest place of preparation and it is of fundamental significance for retention of the filling.
What is isthmus in Class 2 cavity preparation?
What is dovetail in cavity preparation?
dove·tail. (dŭv’tāl), A widened portion of a cavity preparation usually established to increase the retention and resistance form.
How do you prepare a Class 2 cavity?
Envision the cavity preparation outline and extent:
- Always keep the bur perpendicular to the long axis of the tooth.
- Follow the anatomical grooves of the tooth
- Leave a small “enamel shell” interproximally to protect the adjacent tooth from iatrogenic damage.
How many line angles does a Class 2 cavity have?
11 line angles
For class II preparation (mesio-occlusal or disto-occlusal) 11 line angles and 6-point angles are as follows (Fig. 7.17). The following is the nomenclature for mesio-occlusal tooth preparation.