Attachment B- Quality Assessment of Dental Laboratory Procedures.pdf

QUALITY ASSESSMENT OF DENTAL LABORATORY PROCEDURES

Fixed Partial Dentures (FPD)/Crowns

A. Custom Trays

Indicated relief has been well adapted Is well adapted to the teeth and residual ridge Covers all indicated anatomy Completely fills the vestibule Is extended to the beginning of the land area when indicated Is adequate for rigidity Is smooth and free of sharp areas

B. Working Casts/Dies

All necessary anatomic landmarks are included Dies are stable, retentive, and do not rotate No bubbles or defects present in the cast Dies are properly ditched, retaining as much root structure as possible

C. Cut-Back Design for Veneer Application

Coping/wax crown cut-back design allows for a uniform 2mm thickness of veneer Proximal cut-back design allows for marginal ridge veneer support Rigid connector size is maximized, within the constraints, for periodontal health and esthetics A uniform transition exists between metal and veneer material

D. Veneer Application

Axial contours are within normal limits for the particular tooth and/or arch form Applied veneer shade matches the requested shade per shade guide submitted or universal (Vita, Trubyte, Ivoclar, etc.) system

E. Finish/Polish of FPD/Crown

Axial contours are within normal limits for the particular tooth and/or arch form A uniform transition exists between metal and veneer material No unsupported veneer material remains on the allow substructure All margins are closed on the die The established vertical dimension of occlusion is maintained when the FPD/crown is articulated The veneer material is appropriately finished (glazed, polished, etc.)

The substructure metal is highly polished

Surveyed Crowns for Removable Partial Denture Abutments

All aspects of FPD/crown fabrication are employed Posterior occlusal rests:

are ½ the width of the buccal-lingual cusp tip width are spoon-shaped, deepest toward the center of the tooth form an acute angle with the guide at the most axial point re-establish original marginal ridge contours maintain occlusal contours

Cingulum rests:

are placed in the gingival 1/3 of the crown to avoid occlusal interferences provide a positive stop for the removable partial denture

Guide planes, distal-extension:

include a 1mm wide band of surface parallel to the established tilt, form the facial line-angle to the lingual/palatal line-angle are undercut to the established tilt on the gingival one half of the axial surface

Guide planes, tooth-borne/modification spaces:

include a 3-4mm wide band of surface parallel to the established tilt, form the facial line-angle to the lingual/palatal line-angle

Survey lines, circumferential direct retainers:

begin in the gingival one-third of the abutment adjacent to the rest end in the occlusal 1/3 of the abutment to establish the desired undercut allow for the terminal one-third of the retainer to be placed into the undercut

Survey lines, bar direct retainers:

a “U” shaped survey line established the desired undercut