Veneers are masks for the tooth and these are specially designed and made as per the specifications and requirements of each patients according to size and color matching with other teeth present. Discussed below are various methods and techniques of fixing of Veneers and their prepartion in laboratories.

Intraenamel Preparation              

1.   It is the roughing of the surface in the under contour surface of the tooth. The significance of this is:

2.   To provide space for veneering material.

3.   Remove fluoride rich layer of enamel which is more resistant to acid etching.

4.   To create a rough surface for improved bonding.

5.   To create a define finish line for placing indirectly fabricated veneers

 Location of Gingival Margin

If the defect or discoloration does not extend subgingivally, then the margin of the veneer should not extend subgingivally.

Basic Preparation Design for Veneers

 Partial Veneers

  1. does not extend subgingivally.
  2. does not involve incisal angle

Full Veneers

It has two basic preparation designs

Window Preparation

 Recommended for most of the direct and indirect composite veneers.

Indications:

  1. To preserve functional lingual and incisal surfaces of maxillary anterior teeth.
  2.  For indirectly fabricated porcelain veneers, if the patient exhibits significant occlusal function.
  3. To prepare maxillary canine in the patient with canine guided lateral guidance.

Advantages

  1.  Better preservation of functional surfaces of enamel.
  2.  Reduces the potential for accelerated wear of opposing tooth.

Incisal Lapping Procedure

Indications

  1. When veneering tooth needs lengthening.
  2. When incisal defects are present.
  3. Used for porcelain veneers.

Direct Veneer Technique 

Direct Partial Veneer

Small localized intrinsic discoloration or defects that are surrounded by healthy enamel and ideally treated with direct partial veneers. These defects can be restored in one appointment with light cured composites.

Preliminary steps

  1. Cleaning
  2. Shade selection.
  3. Isolation with rubber dam.

Direct Full Veneers

Extensive enamel hyperplasia involving all of maxillary anterior teeth is treated by direct full veneers.                              

Preliminary steps:

  1.  Cleaning.
  2.  Shade selection.
  3.  Isolation with rubber dam.             

          

Creating porcelain veneers in the laboratory

Indirect Veneer Technique

1.   The window preparation is made with a tapered, round end diamond instrument.

2.   Depth is 0.5mm to 0.75mm midfacially diminishing to a depth of 0.3mm to 0.5mm along the gingival margin depending in the thickness of enamel.

3.   The Interproximal margins should be extended into facial and gingival embrasures without engaging the undercut.

4.   If a small amount of dentin is exposed then a thin coat of dentin bonding agent is applied and cured.

5.   Elastomeric impression is made of the preparation.

6.   Cast is made from impression with individually removable disc to facilitate access to the interproximal area.

7.   Once veneer is fabricated and patient recalled and fit of each veneer is evaluated on individual tooth.

8.   New tooth to be veneered are clean with pumice.

9.   Then layer of resin bonding agent is applied the tooth side of veneer with microabrassion.

10.   Light cure resin bonding material is recommended for bonding the veneer to the tooth.

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