Dental Stuff

Topics: Teeth, The Wall, Angle Pages: 2 (316 words) Published: January 1, 2014


CLASS 1 AMALGAM RESTORATION

INITIAL TOOTH PREPARATION
Outline Form:
It is the perimeter of tooth preparation in width, length and depth dimensions.

Location:
i. Occlusal surface of posterior teeth
ii. Occlusal 2/3rd of Facial & Lingual surfaces of posterior teeth iii. Lingual surfaces of anterior teeth
Shape:
i. Mortise Shape
Inverted Cone Shape Mortise
Box Shape Mortise
Mortise shape defines that each wall and floor is in form of a flat plane, meeting each other at definite line and point angles. It is the most accessible type of shape.
Boundaries:
Facial Groove
Lingual Groove
Mesial Marginal Ridge*
Distal Marginal Ridge*
*Step short of Marginal Ridge Crest

Eliminate all defective tooth structures
Eliminate unsupported Enamel
Width of any portion of cavity (mesiodistally/buccolingually) should be at least 1.5mm All line and point angles should be rounded but definite
Resistance Form:
It is the shape & placement of preparation walls that best enable both the restoration & tooth to withstand, without fracture, masticatory forces delivered principally in long axis of tooth. Box shape

Smooth & Flat Pulpal floor
Parallel Walls
Mesial/Distal walls should be divergent: 2 to 5 degrees
Diverge slightly pulpo-occlusally in buccal & lingual groove extensions Rounded internal angles
Depth= 0.5mm into dentine (DEJ 0.5mm)
Cavosurface angle:
The angle formed by the junction of the wall of a prepared tooth cavity with the external surface of the tooth. It should be from 90⁰ to 110⁰

Retention Form:
Enamel margins should be prepared at a right obtuse angle
Buccal/Lingual walls should be convergent: 2 to 5 degrees
Converge slightly pulpo-occlusally in areas of triangular ridge Convenience Form:
It facilitates & provides sufficient visibility, accessibility & ease of instrumentation in preparing and restoring the teeth. Proper refinement of the line and point angles is sufficient to produce the necessary convenience form Insertion...

References: -Art & Science of Operative Dentistry 5th edition
-Operative Dentistry by Marzouk
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