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Inside Dental Technology

January 2012, Volume 3, Issue 1
Published by AEGIS Communications


Cosmetic Dentistry with Minimal Preparation Veneers

An in-depth look at how proper treatment planning and communication fulfilled a patient’s specific cosmetic expectations.

By Juan M. Escobar, CDT, AACD

As the general public b comes more educated about cosmetic dental procedures and the multiple restorative options available, the dental team is increasingly challenged to fulfill their patients’ expectations. It is only through teamwork and proper communication among the patient, dentist, and dental laboratory technician that predictable results can be a complished. In this case, a 37-year-old woman was unhappy with her smile and had specific demands and expectations. Her primary concern centered on her overly prominent upper canines and the constricted appearance of her upper arch when she smiled (Figure 1). The patient’s goal was to correct these deficiencies without orthodontic treatment and in the most conservative way.

Diagnosis and Treatment Plan

The clinical cause of the patient’s primary complaint was that the excessive reveal of the mesial aspect of teeth Nos. 6 and 11 was the result of the rotation of teeth Nos. 7 and 10 (Figure 2). Previous attempts to correct the problem with orthodontic removable appliances had failed due to the nature of the patient’s job and her difficulty in adapting to the appliance.

The attending dentist performed a thorough examination and took a variety of records to aid and proceed with the treatment plan. A series of 12 images, following the American Academy of Cosmetic Dentistry Accreditation protocol,1 were taken and articulated models, restorative material recommendations, tooth-preparation guidelines, and a general discussion of the case were all sent to the laboratory for evaluation.

The treatment plan created by the dental team to fulfill the patient’s expectations was as follows:

  • Replace the defective restoration on tooth No. 8 (DF) with direct composite.
  • Restore the depression on tooth No. 9 (MF/F) with direct composite.
  • Place a porcelain veneer on tooth No. 7 to correct the rotation and reduce the incisal embrasure between teeth Nos. 6 and 7 to make tooth No. 6 appear less prominent.
  • Place a porcelain veneer on tooth No. 10 to correct the rotation and reduce the incisal embrasure between teeth Nos. 10 and 11 in order to make tooth No. 11 look less prominent.
  • Bleaching of the upper and lower arch.

Based on the dental team’s treatment plan, the author fabricated a diagnostic wax-up and the dentist made a mock-up of the finished case to help the patient envision the final result.

Teeth Nos. 7 and 10 were prepared for porcelain veneer restorations. The preparations were supragingival and conservative, especially in the distal, where tooth shape would be increased facially. Mesial contacts were broken in both teeth to allow a better position of the mesial and distal aspect. A matrix made from the wax-up was used to visualize the reduction needed (Figure 3 and Figure 4).

Laboratory Procedure

The case was received at the laboratory a companied by photographs, the diagnostic wax-up, models of the approved temporaries, a prescription form, and an impression of the prepared teeth. Stone models were poured, pinned, and trimmed in the traditional manner, and then cross-mounted with temporary models and preoperative models on a semi-adjustable articulator. A solid model of the master impression was poured to check the interproximal contacts, and an extra set of dies was poured and trimmed.

Powder/liquid porcelain feldspathic veneers were prescribed for this case to allow the ceramist to build in the custom internal characterizations that were present on the adjacent teeth in order to achieve a perfect shade match. The choice of feldspathic veneers also allowed minimal reduction of tooth structure and facilitated the blending of the margins with the tooth at the margin line.

The foil technique was selected for the build-up. Platinum foil 0.1-inch was adapted to each prepared die using a bamboo chopstick shaped as a point on one end for margin adaptation and flat on the other for wide surfaces (Figure 5 and Figure 6). Once adapted to the die, the foil was then steam-cleaned to avoid contamination of the porcelain. The traditional technique of wedging of the die and heat treatment of the platinum foil was not used because the author does not find any considerable advantage in doing so. It is important to note that one of the challenges of this case was to match the shade provided. The porcelain chosen to restore this case, IPS d.Sign (Ivoclar Vivadent, www.ivoclarvivadent.com) is not available in the 3D Vita Shades (Vident, www.vident.com) that best matched the patient’s dentition. Therefore, a mixture of different dentins was used to convert from the Classic Vita Shade Guide to the 3D Vita Shade guide. The 1M1 Dentin was created by mixing two parts A1 Dentin with one part BL3 Dentin. The 1M2 shade was created by mixing equal parts of A1 and B1 Dentins with a dot of mahogany stain.

To start masking out the original preparation shade, a thin layer of deep dentin mix for 1M1 was applied to the entire surface of each tooth, maintaining a clear line 1 mm above the gingival margin. The deep dentin was not applied 1 mm above the margin line so it could achieve better marginal adaptation. Because the porcelain will shrink toward the center, this will tend to distort the foil. This can be easily readapted after firing if the porcelain does not cover the margin. Subsequent firings will be subject to less shrinkage—therefore, adding the margin later will result in less shrinkage in the margin line. Other important reasons will be addressed later in this article.

After firing, the foil was readapted to the dies, and a second bake of the previous deep dentin mix and dentin was applied to the incisal two thirds. The mix for the 1M2 dentin shade was applied to the gingival one third, still keeping clear of the margin area. Extension of the incisal edge was created—making sure no demarcation of the preparation would show in this area2 (Figure 7 and Figure 8).

After firing these preliminary layers, the foil was readapted again and dentin was placed to full-contour. A cutback in the wet porcelain was made at the incisal one third, and incisal enamels E1 and E2 in equal parts were applied at the edge and around the mesial and distal to create the translucent area. Mamelon S was placed close to the incisal in the distal lobe and Mamelon L was placed close to the mesial (Figure 9). The build-up was checked regularly to verify the correct incisal edge position against the putty matrix made from provisional model.3

After the ceramic bake, this porcelain canvas was evaluated for shade and internal characterization. Small modifications were made with internal stains: Light blue was applied to extend the translucency; Cream to intensify the mesial mamelons; and A1/B1 universal shades were applied at the gingival one third to intensify the chroma in this area. Enamel crack characterizations were then incorporated by painting thin lines of stains near the side of the light blue translucency line along half the incisal tooth. The stains were then set-fired in the oven at a lower temperature2 (Figure 10).

To create the contact lens or chameleon affect, a mix of the 1M2 dentin and translucent enamel were applied to the gingival third, which blended the restoration with the tooth structure at the margin and made the supragingival margin invisible. This is the second reason to keep clear of the margin until this point in the build-up (Figure 11, Figure 12 and Figure 13). Final enamels were applied to create the final shape in the lateral segmentations and to create the appearance of depth2 (Figure 14).

After firing, occlusal and interproximal contacts were checked and adjusted. Final contouring was completed using various diamond burs. Surface texturing to mimic that of the adjacent teeth was performed using different burs and ceramic polisher disks4 (Figure 15). After glazing, the veneers were mechanically polished using different polisher disks and Dia-glaze (Yeti Dental, www.en.yeti-dental.com) using a bristle brush to give a natural luster.

The foil was removed from the veneers, margin integrity was checked with the extra set of dies, and interproximal contacts were checked on the solid model. Finally, the restorations were sandblasted with aluminum oxide at 25-psi, steam-cleaned, and packed for shipping. The veneers were not etched at the laboratory, as an established protocol with the dentist, to avoid re-etching after try-in on the models and in the patient’s mouth (Figure 16). The dentist tried the veneers for fit, contacts, occlusion, and shade. After the patient’s approval, the veneers were seated.

Conclusion

Cosmetic dentistry does not always mean perfectly white, straight teeth. The goal of any cosmetic treatment is to improve the patient’s smile by fulfilling the patient’s expectations. Often that can be achieved with simple but effective treatments like the one presented in this article. Even though the final result was not a perfectly symmetrical smile, the treatment addressed the patient’s concerns in a conservative manner and gave her invisible, natural-looking restorations that enhanced her smile and fulfilled her expectations (Figure 15, Figure 16, Figure 17 and Figure 18).

Acknowledgment

The author would like to thank Patrick W. Gochar, DDS, PA, for his outstanding dental work and photography in this and all his cases. Most of all, he would like to thank him for helping the author in the accreditation process by providing and allowing him to fabricate the necessary cases.

Author’s Note

The case presented in this article was submitted for review by the author and the dentist and passed as a case Type II requirement (single-tooth match) in the process of the author’s accreditation by the American Academy of Cosmetic Dentistry (AACD).

References

1. Photographic Documentation and Evaluation in Cosmetic Dentistry: A Guide to Accreditation Photography. Madison, WI: American Academy of Cosmetic Dentistry, 2009.

2. Jun S. The Art of Enhancing Natural Beauty. Dental Dialogue. 6(4);2006:85-92.

3. Dawson P. The Concept of complete Dentistry Series: Manual for Seminar One. The Dawson Academy, St. Petersburg FL; 2001:III-21.

4. Magne P, Belser U. Bonded Porcelain Restorations in the Anterior Dentition: A Biomimetic Approach. 1st ed. Hanover Park, IL: Quintessence Publishing Co; 2002:70-76, 82.

About the Author

Juan M. Escobar, CDT, AACD
Owner
Key Element Dental Laboratory LLC
Chesapeake, Virginia


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Image Gallery

Figure 1  Cupping and cratering from abrasion.

Figure 1

Figure 1  The patient expressed displeasure with the overly prominent appearance of her upper canines.

Figure 1

Figure 2  Advanced NCLTS from bruxism, mandibular arch.

Figure 2

Figure 2  The distal rotation of the patient’s lateral teeth was the underlying cause for the over reveal of the canines.

Figure 2

Figure 3  Cupping and cratering from erosion.

Figure 3

Figure 3  The matrix from the diagnostic wax-up shows the clinician the amount of tooth reduction needed.

Figure 3

Figure 4  Advanced NCLTS from bruxism, maxillary arch.

Figure 4

Figure 4  The facial view of the matrix helps to create an even and adequate reduction for the veneers.

Figure 4

Figure 5  Moderate NCLTS from bruxism, maxillary arch.

Figure 5

Figure 5  Platinum foil was adapted to each of the dies. These are instruments required for adaptation and removal of the platinum foil.

Figure 5

Figure 6  Moderate NCLTS from bruxism, mandibular arch.

Figure 6

Figure 6  The adapted platinum foil substructures.

Figure 6

Figure 7  Moderate NCLTS from toothpaste, maxillary arch.

Figure 7

Figure 7  To avoid the demarcation line of the preparation line, deep dentin was applied to the incisal one third and blended with the middle one-third.

Figure 7

Figure 8  Moderate NCLTS from toothpaste, mandibular arch.

Figure 8

Figure 8  The incisal one-third was gradually integrated with the middle of the restoration.

Figure 8

Figure 9  Moderate NCLTS from toothpaste, right facial view.

Figure 9

Figure 9   The canvas build-up of dentin, incisal translucency, and mamelons remains clear of the 1-mm line from the margin.

Figure 9

Figure 10  Moderate NCLTS from toothpaste, left facial view.

Figure 10

Figure 10  Internal shading and characterization were completed before fire-setting at a lower temperature.

Figure 10

Figure 11  Advanced NCLTS from toothpaste, maxillary arch.

Figure 11

Figure 11  Body dentin and Translucent Neutral 50:50 were applied to complete the gingival one third, creating the chameleon effect.

Figure 11

Figure 12  Advanced NCLTS from toothpaste, mandibular arch.

Figure 12

Figure 12  Final enamels were used for the supragingival preparation, blending the porcelain margin with the tooth structure.

Figure 12

Figure 13  Advanced NCLTS from toothpaste, right facial view.

Figure 13

Figure 13  Achieving an invisible margin line and chameleon effect is possible using the power/liquid feldspathic veneer technique.

Figure 13

Figure 14  Advanced NCLTS from toothpaste, left facial view.

Figure 14

Figure 14  Final enamels were applied to create the final contour build-up.

Figure 14

Figure 15  Moderate NCLTS from regurgitation, maxillary arch.

Figure 15

Figure 15  Surface texture was added and the restoration was ready for glazing.

Figure 15

Figure 16  Moderate NCLTS from regurgitation, mandibular arch.

Figure 16

Figure 16  The finished veneers on the master model.

Figure 16

Figure 17  Advanced NCLTS from regurgitation, maxillary arch.

Figure 17

Figure 17  Frontal view of the patient before veneer placement shows the excessive reveal of the mesial aspect of teeth Nos. 6 and 11 and the wide incisal embrasures.

Figure 17

Figure 18  Advanced NCLTS from regurgitation, mandibular arch.

Figure 18

Figure 18  Frontal view after porcelain veneers were placed displays a better arrangement of the laterals.

Figure 18

Figure 19  Moderate NCLTS from soda-swishing, maxillary arch.

Figure 19

Figure 19  After conservative cosmetic dentistry, the patient’s concerns were met and her expectations were fulfilled.

Figure 19

Figure 20  Moderate NCLTS from soda-swishing, mandibular arch.

Figure 20

Figure 21  Chronological comparison of 6- and 12-year mandibular molars, soda-swishing.

Figure 21

Figure 22  Advanced NCLTS from soda-swishing, maxillary arch.

Figure 22

Figure 23  Advanced NCLTS from soda-swishing, mandibular arch.

Figure 23

Figure 24  Moderate NCLTS from fruit-mulling, maxillary arch.

Figure 24

Figure 25  Moderate NCLTS from fruit-mulling, mandibular arch.

Figure 25

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