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Complete Denture Essay

Below is an essay on "Complete Denture" from Anti Essays, your source for research papers, essays, and term paper examples.

PRINCIPLES OF TOOTH
PREPARATION

DR. MOHAMMAD AL AMRI

pp:119-133

PRINCIPLES OF TOOTH
PREPARATION
1. PRESERVATION OF TOOTH
STRUCTURE
2. RETENTION AND RESISTANCE
3. STRUCTURAL DURABILITY
4. MARGINAL INTEGRITY
5. PRESERVATION OF PERIODONTIUM

PRESERVATION OF TOOTH
STRUCTURE
• Partial veneer
versus Full veneer
crown
• Supra-gingival
margin versus subgingival

RETENTION AND RESISTANCE
• Retention prevents removal of
the restoration along the path of
insertion or long axis of the
tooth preparation.
• Resistance prevents
dislodgement of the restoration
by forces directed in an apical
or oblique direction and
prevents any movement of the
restoration under occlusal
forces.
• Retention and resistance are
interrelated and often
inseparable qualities.

RETENTION
• The essential element of
retention is two opposing
vertical surfaces of the
same preparation.
• These may be external
surfaces such as the
buccal and lingual walls
of a full veneer crown
(sleeve retention).

RETENTION
• The opposing surfaces
can also be internal,
such as the buccal and
lingual walls of the
proximal box of an inlay.
• An intracoronal
restoration resists
displacement by wedge
retention.
• Many restorations are a
combination of the two
types.

RETENTION AND RESISTANCE

1. Taper
2. Freedom of
displacement
3. Length
4. Substitution of
internal features
5. Path of insertion

TAPER
• The axial walls must taper slightly
to permit the restoration to seat;
i.e. the two opposing external
walls must gradually converge or
the opposing internal walls must
gradually diverge occlusally.
• The terms angle of convergence
and the angle of divergence can
be used to describe the respective
relationships between the two
opposing walls of the preparation.

TAPER
• The relationship of one
wall of a preparation to
the long axis of that
preparation is the
inclination of that wall.
• The two opposing
surfaces, each with a...

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