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Special Issues
July/August 2019
Volume 40, Issue 1
Peer-Reviewed

OMNICHROMA: One Composite That Covers All Shades for an Anterior Tooth

Robert A. Lowe, DDS

Creating esthetic direct composite restorations that precisely match existing tooth color can be a difficult clinical challenge for even the most experienced clinician. Shades for most composite materials rely upon shade guide technology that dates back to the 1950s. Clinical reality, however, is that many composites do not precisely match standard shade guides let alone each other. This can be extremely frustrating for clinicians, especially with a patient who is especially particular about esthetic matching. Having a "universal," single-shade composite system like OMNICHROMA (Tokuyama Dental America, tokuyama-us.com) takes the guesswork and frustration out of shade selection. The resin-based dental restorative material provides a match in a majority of clinical situations. In the case presented, the clinician was faced with the exceptional challenge of not only having to match direct composite material to tooth structure but also trying to match a portion of a single central incisor seamlessly with the surrounding enamel. Additionally, because the restoration was at the incisal edge, typically a high-stress area during function, good retention was essential to support the small missing portion of the tooth. The use of OMNICHROMA enabled a beautiful, high-strength match to be achieved without reliance on a traditional shade guide.

Key Takeaways

One-shade system-OMNICHROMA from Tokuyama Dental America is a universal composite that esthetically matches every patient, from shades A1 to D4, with a single shade.

Smart Chromatic Technology-Uniformly sized supra-nano spherical fillers allow OMNICHROMA to match
all of the 16 VITA classical shades, enabling clinicians to simplify their procedures.

Exceptional physical-mechanical properties-In addition to offering unprecedented color matching
and high polishability, OMNICHROMA provides high wear resistance,
high compressive strength, and
superb handling.

About the Author

Robert A. Lowe, DDS
Private Practice,
Charlotte, North Carolina;
Diplomate,
American Board of Aesthetic Dentistry

Fig 1. A 30-year-old patient reported complaining that bonding on the incisal edge of tooth No. 9 “keeps coming off” and that it had been “fixed five times.” Matching direct composite material to a portion of a tooth seamlessly with surrounding enamel is a challenge, given internal characterization and the gradation of opacity and translucency in the local area. Also, adequate retention was required for long-term success.

Figure 1

Fig 2. It was, therefore, important to create a long bevel of enamel (3 mm) on the incisal third; thus, 0.5 mm to 0.75 mm of tooth reduction was performed facially with a course diamond (Komet USA, kometusa.com), as shown, to allow the restorative material to have sufficient thickness so it could blend with the natural tooth and have adequate micromechanical retention for bonding and retaining the restoration.

Figure 2

Fig 3. Next, mylar strips were placed in the contact areas, both mesial and distal, in preparation for etching (Select Etch HV®, Bisco , bisco.com) (Fig 3) and bonding (Tokuyama Universal Bond, Tokuyama Dental America) (Fig 4).

Figure 3

Fig 4. Next, mylar strips were placed in the contact areas, both mesial and distal, in preparation for etching (Select Etch HV®, Bisco , bisco.com) (Fig 3) and bonding (Tokuyama Universal Bond, Tokuyama Dental America) (Fig 4).

Figure 4

Fig 5. Upon completion of the adhesive steps, a thin layer of OMNICHROMA BLOCKER (Tokuyama Dental America) was placed at the incisal portion of the preparation to increase the tooth to the desired length (just short of the incisal edge) and to help eliminate shade matching interference from other parts of the mouth.

Figure 5

Fig 6. OMNICHROMA was then placed and contoured using a composite plastic filling instrument, and then the OMNICHROMA layer was cured. An 8-fluted carbide finishing bur (ET 9, Komet USA) and then an abrasive disc (Super-Snap® Rainbow Abrasives, Shofu, shofu.com), as shown, were used to contour the restorative material prior to final polishing. Notice how this one-shade system composite takes on the shade of the surrounding tooth immediately after placement.

Figure 6

Fig 7. Rubber abrasives (A.S.A.P.® All Surface Access Polishers, Clinician’s Choice, clinicianschoice.com) were used to polish proximal and facial surfaces of the composite.

Figure 7

Fig 8. Final retracted facial views of the completed restoration on tooth No. 9 demonstrating OMNICHROMA’s ability to provide a beautiful esthetic match.

Figure 8

Fig 9. Final retracted facial views of the completed restoration on tooth No. 9 demonstrating OMNICHROMA’s ability to provide a beautiful esthetic match.

Figure 9

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