Denture Technician’s Foreword
This edition focuses on the clinical aspects of porcelain veneer preparation. First and foremost, it is important to emphasize that there are numerous methods for preparing porcelain veneers, and each expert has their own set of techniques and corresponding logic. When learning veneer preparation skills, we might find ourselves overwhelmed by the variety. However, simplicity leads to clarity. The key is to understand the purpose of creating porcelain veneers and to let this purpose guide clinical decisions, choosing the appropriate veneer preparation method accordingly. This in-depth article will use the most common tooth for veneer restoration—the maxillary central incisor—as a blueprint to explain the basic method of porcelain veneer preparation. It is important to remember that this method is not a one-size-fits-all solution and should not be applied indiscriminately to all teeth, not even all central incisors, without considering the specific circumstances.
### Basic Steps for Maxillary Central Incisor Porcelain Veneer Preparation:
1. Prepare depth grooves and perform coarse preparation on the incisal edge and labial surface.
2. Coarse preparation of the cervical and proximal transition areas.
3. Remove sharp areas and perform final preparation.
– **Figure 1**: Before preparing the abutment tooth, a silicone rubber preparation guide must be made in advance to confirm the amount of preparation needed.
– **Figure 2**:
– **Figure 3**: Try in the silicone rubber guide, observing from the sagittal plane for suitability.
– **Figure 4**: Try in the silicone rubber guide, observing from the horizontal plane for suitability.
– **Figure 5**: Prepare three depth grooves (1.0 mm) on the incisal edge.
– **Figure 6**: After preparing the depth grooves on the incisal edge.
– **Figure 7**: Perform coarse preparation of the incisal edge along the depth grooves.
– **Figure 8**: Completion of coarse preparation of the incisal edge.
– **Figure 9**: Prepare three depth grooves (0.3 mm) on the labial surface; the cervical depth groove must be at least 1.5 mm from the gingival margin.
– **Figure 10**: Deepen the central and incisal third depth grooves on the labial surface to 0.5 mm.
– **Figure 11**: After preparing the depth grooves on the labial surface.
– **Figure 12**: Use a marking pen to highlight the depth grooves to easily identify the amount of tooth structure removed.
– **Figure 13**: Use a finer chamfer bur to roughly prepare the cervical margin.
– **Figure 14**: Transition to the proximal area, roughly preparing the marginal line of the proximal transition area.
– **Figure 15**: Use a coarser chamfer bur to prepare the labial surface along the depth grooves.
– **Figure 16**: Completion of coarse preparation of the labial surface, ensuring a slight trace of the marking pen remains.
– **Figure 17**: Use a finer red-marked chamfer bur to finely prepare the cervical margin.
– **Figure 18**: To preserve as much enamel as possible, tilt the tip of the bur slightly inward when preparing the cervical third of the labial surface.
– **Figure 19**: When preparing the proximal transition area, use a spoon excavator to gently push the adjacent tooth, creating an interproximal space to avoid damaging the adjacent tooth, then use a finer red-marked chamfer bur to finely prepare the marginal line of the proximal transition area.
– **Figure 20**: Use a coarser red-marked chamfer bur to finely prepare the labial surface.
– **Figure 21**: Use a finer chamfer polishing bur to finely prepare the transition area between the labial and proximal surfaces.
– **Figure 22**: Use a polishing disc to remove sharp edges in the proximal transition area, making it smooth and rounded.
– **Figure 23**: Apply the same procedure to the incisal edge.
– **Figure 24**: Use a silicone rubber polishing bur to smooth the prepared surface.
– **Figure 25**: Mesial view of the preparation after completion.
– **Figure 26**: Frontal view of the preparation after completion.
– **Figure 27**: Distal view of the preparation after completion.
– **Figure 28**: Use the silicone rubber preparation guide to confirm the amount of tooth preparation.
– **Figure 29**: Use the silicone rubber preparation guide to confirm whether the shape of the preparation aligns with the final restoration design.
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