Partial Veener
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Transcript of Partial Veener
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PARTIAL VENEER CROWNS
Three quarter crown
Seven Eighth Crown
Mesial Half Crown
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INDICATIONS FOR PARTIAL VENEER CROWNS Partial veneer crowns are a conservative measure and are
preferable to the complete veneer restoration. Indications include: Intact or minimally restored teeth. Teeth with crown length that is average or that exceeds the
average. Teeth with normal anatomic crown form, i.e., without excessive
cervical constriction. Anterior teeth with adequate labiolingual thickness. No conflict between axial relationship of tooth and proposed path
of withdrawal of FPD.
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CONTRAINDICATIONS FOR PARTIAL VENEER CROWNS High caries rate- unprepared surface as well as increased
margin susceptible to caries. Teeth with extensive restoration – partial veneer crowns are
preferred on sound teeth. Deep cervical lesion – difficult to establish finish line , if area is
sensitive complete coverage crown is indicated. Teeth with short clinical crown – difficult to achieve resistance
and retention form. Aesthetics is compromisedBell shaped teeth – require more cervical reduction due to the convergence, which might cause damage to pulp.
Thin teeth – preparation of retention grooves is difficult. Poor alignment of teeth in the dental arch.
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ADVANTAGES OF PARTIAL VENEER CROWNS Partial veneer crowns have several advantages over complete
crowns: The tooth reduction is conservative. The esthetics surpass the complete veneer cast crown. Margin accessibility for finishing and cleaning is improved. Complete seating of the casting is more easily verified. Complete seating of the casting during cementation is enhanced
by diminished hydraulic pressure. Electric pulp testing can be conveniently accomplished on the
intact enamel surface.
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DISADVANTAGES OF PARTIAL VENEER CROWNS Partial veneer crowns have the following
disadvantages: The partial veneer crown is not as retentive as a
complete veneer crown. There is a limited display of metal with the partial
veneer crown. Skillful preparation is critical to avoid metal display The partial veneer crown preparation is limited to fairly
intact teeth with normally shaped crown and an average length clinical crowns
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PREPARATION FOR PARTIAL VENEER CROWNS
The seven steps for preparation of partial veneer crowns are:
Occlusal or incisal reduction Lingual reduction Interproximal reduction Proximal box or groove placement Occlusal or incisal offset placement Facial bevel Finishing the preparation. the technique for each step may vary,
depending upon whether the tooth is in maxillary or mandibular arch, or anterior or posterior.
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FEATURES OF THE MAXILLARY POSTERIOR THREE QUARTER CROWN FEATURES OF THE MAXILLARY POSTERIOR THREE QUARTER CROWN
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FEATURES OF MAXILLARYCUSPID THREEQUARTER CROWN
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FEATURES OF PIN MODIFIED THREE QUARTER CROWN
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FEATURES OF MANDIBULAR POSTERIOR THREEQUARTER CROWN
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FEATURES OF SEVEN-EIGTH CROWNS
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FEATURES OF THE PROXIMAL HALF CROWN