principles apply. However, a non-standard application that is being used more
frequently at a younger age is the restoration of the peg lateral incisor (547HFig. 10.10 (a)).
This utilizes a no-preparation technique and the technician is asked to produce a
three-quarter wrap-around veneer finished to a knife edge at the gingival margin (548HFig.
10.10 (b)). An elastomeric impression is taken after gingival retraction to obtain the
maximum length of crown, and cementation should be under rubber dam (549HFig. 10.10
(c)).
550H
Fig. 10.10 (a) Peg-shaped lateral incisors
in a 15-year old. (b) Laboratory model
showing three-quarter wrap-around,
porcelain veneers on the upper laterals.
(c) Final restorations on the upper laterals
2 years' postcementation.10.2.9 Adhesive metal castings
The development of acid-etched, retained cast restorations has allowed the fabrication
of cast occlusal onlays for posterior teeth and palatal veneers for incisors and canines.
These restorations are manufactured with minimal or no tooth preparation and are