PARTIAL VENEER CROWNS

Three quarter crown

Seven Eighth Crown

Mesial Half Crown

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.

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.

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.

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

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.

FEATURES OF THE MAXILLARY POSTERIOR THREE QUARTER CROWN FEATURES OF THE MAXILLARY POSTERIOR THREE QUARTER CROWN

FEATURES OF MAXILLARYCUSPID THREEQUARTER CROWN

FEATURES OF PIN MODIFIED THREE QUARTER CROWN

FEATURES OF MANDIBULAR POSTERIOR THREEQUARTER CROWN

FEATURES OF SEVEN-EIGTH CROWNS

FEATURES OF THE PROXIMAL HALF CROWN