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Special Issues
July/August 2024
Volume 45, Issue 1
Peer-Reviewed

Blocking Out Gray for Esthetically Pleasing Crowns

Dentists have long been frustrated by the color gray. In the author's experience, gray teeth whiten slower than yellow teeth, and VITA shades in the gray range ("D" and "C" shades) are more difficult to match, especially in zirconia. The concept discussed in this case presentation deals with an equally troublesome undertaking: covering implant screw-holes and gray-colored posts. Clinicians often are left with a gray-colored circle in the middle of the restoration no matter what they use to cover these holes. This technique overcomes this dilemma. It utilizes OMNICHROMA (Tokuyama Dental, omnichroma.com) single-shade composite as well as OMNICHROMA BLOCKER (Tokuyama Dental), an opaquing agent. The author has used this system with multiple shades ranging from bleach white to A4 with excellent results. In this particular case, a patient with missing teeth Nos. 3 and 5 had implants (Tri-Channel Nobel Biocare N1™ system) placed in both positions. The implants were ready to restore 3 months later. Healing abutments were removed, and impressions were taken using impression copings. Three weeks later, the patient appeared for placement of screw-retained implant crowns. Both healing abutments were removed, the crowns were inserted, and x-rays were taken to verify correct seating of the implant crowns. The screw-holes were covered as depicted.

KEY TAKEAWAYS

The use of OMNICHROMA composites and OMNICHROMA BLOCKER helps overcome the long-standing issue of visible gray circles when covering implant screw-holes and posts.

By addressing this challenge and covering implant screw-holes and gray-colored posts without creating visible gray circles, clinicians can enhance the overall esthetic outcome of their restoration, thereby improving patient satisfaction.

This patient case involving two implants on teeth Nos. 3 and 5 achieved successful implant crown placements and seamless restorations, demonstrating the clinical effectiveness of the systematic approach presented utilizing single-shade composites.

Peter Auster, DMD
Private Practice, Pomona, New York; 12 years in leadership at American Academy of Cosmetic Dentistry; Fellow, International College of Dentists and American College of Dentists; Dawson Academy Scholar; AACD Humanitarian of the Year

Fig 1. Screw-holes in screw-retained implant crowns, Nos. 3 and 5.

Figure 1

Fig 2. The implant screws were torqued to 20 Ncm (not 35 Ncm as with previous implants from the manufacturer).

Figure 2

Fig 3. To begin the treatment sequence of sealing the space and concealing the screw-hole, porcelain etchant was placed for 60 seconds after the margins were roughened using a rough football diamond bur.

Figure 3

Fig 4. A universal primer (Monobond® Plus, Ivoclar) was used as a silane agent.

Figure 4

Fig 5. The outer margins and inner canal were coated with a universal adhesive (Adhese® Universal, Ivoclar).

Figure 5

Fig 6. The screw-hole was thoroughly dried with cotton pellets and a dry air spray

Figure 6

Fig 7. Two inches of plumber’s tape was placed in each chamber.

Figure 7

Fig 8. Then, 0.5 mm of OMNICHROMA BLOCKER was placed above the plumber’s tape to cover any display of metal.

Figure 8

Fig 9. It is imperative to use only 0.5 mm to 1 mm of OMNICHROMA BLOCKER, as shown, and to leave maximum space for OMNICHROMA composite.

Figure 9

Fig 10. OMNICHROMA composite was placed in 2 mm increments.

Figure 10

Fig 11. The cured composite was polished using sculpting burs (Occlusinator®, Strauss Diamond) and then polishing burs.

Figure 11

Fig 12. The screw-holes were virtually invisible with minimal gray showing through.

Figure 12

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