When practicing esthetic dentistry, we all want to stay minimally invasive while getting simplified procedures while trying to achieve the best result for our patient. Yet, when it also comes to the lab, we need to resort to a few tricks up our sleeve to make our technician’s job easier.
This patient came to my attention complaining of the darkening of his upper left central incisor after undergoing and orthodontic treatment. He also complained about the two central incisors having a different shape and the large diastema in between.
Both teeth had composite old fillings, so we decided to start by taking an impression and moving to the lab to lay out a plan. Our goal was to save the largest possible amount of enamel to ensure the best adhesive outcome in the long run.
The project included two additive restorations to save the sound enamel on both teeth and mask the discolored substrate. We proposed two disilicate veneers as the final solution, showing the mock up to the patient to get his approval.
So we started from the preparation. After placing the mock up in the mouth, I started by shortening the incisal edge by 0.5 mm, with an appropriately dimensioned.
With the second bur, i reduced the buccal surface by 0.5 mm, and then I united the horizontal grooves left with the 1mm bur, halfway through to ensure a controlled 0.5 mm reduction.
It is very important to slice the incisal edge, to leave adequate spacing for the technician in this esthetically crucial area. Then, with the help of the LM Eccesso instrument, i removed the remaining parts of the mock up from the teeth.
Another crucial area is the central core of the tooth. This part needs to be over prepared just a little bit, in order to avoid getting a convex shape of the veneer due to limited spacing.
So I proceeded to flatten this area very delicately.
The last crucial steps included using a disc to round up the the corners of the preparation (upper left), a bur to better define the azimuth in the cervical area (upper right), a 30 micron bur (lower left) to smoothen the preparation, and a flam bur to cancel any possible undercuts (lower right).
The finished preparations had an almost vertical cervical area. Most of the enamel was preserved. Only four burs and one disc for «peeling» the tooth accordingly with the technician’s project were used.
The depth of the preparation was double-checked with the silicone buccal guides. An adequate thickness of the veneer will match perfectly with the project approved, giving the technician freedom to make any characterization needed and to add any wanted detail.
As a tip, I suggest to place a small amount of soft wax to close small gaps in between teeth to avoid tearing of the elastic impression material.
The precision impression was taken using a polyether.
Model and the milled disilicates (thanks to DT Daniele Rondoni).
Finalization of the veneers. The final shape will be determining for the esthetic success.
Temporary in place, after one week. The temporary restorations were made of flow composite, coping the mock up and pushing the material a bit apically the cervical margin.
The two veneers ready to be treated and cemented in the mouth.
When I need to cement 2 central veneers, and I can isolate the laterals and feel able to control humidity, I do prefer not to use the rubber dam. It helps my concentration on the esthetic positioning of the veneers. No shame in that!
Some details. The initial impression (top), the prepared teeth (bottom) in the frontal view.
Occlusal view of the preparations (top) and the project (bottom). An adequate addition helps rejuvenate the teeth and save the thin buccal enamel for a perfect adhesion.
Veneers after cementation. Note the good harmony pink/white harmony.
Final pictures with bouncers help see the value of the project and the shape of the surfaces.
A great technician today is an architect. He’s the one making a good plan for the dentist. On his end, a good dentist is able to transform the plan in reality with very few touches. Only this synergy can make dentistry easy and accessible to everyone.
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