Complete Denture Essay

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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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