Inside Dentistry
June 2015
Volume 11, Issue 6

Current Protocol for Successful Treatment of Difficult Whitening Cases

KöR Whitening offers effective noninvasive treatment for tetracycline staining case

Andrew Green, DDS

Some stains, such as those from fluoride (fluorosis) and tetracycline, are extremely resistant to conventional whitening techniques.1-3 They are more inorganic than other sources of tooth discoloration, meaning that both types of stains are extremely difficult to convert.1,4,5 This is because both fluoride and the tetracycline family of antibiotics bind so strongly to the hydroxylapatite (hydroxyapatite) molecules1,4-6 that comprise enamel, dentin, and bones that they actually become part of the chemical structure.7

Due to their nature, these stains have previously been nearly impossible for dental professionals to whiten successfully. No separate organic stain and pigment molecules exist in these cases, and typical whitening systems cannot sufficiently penetrate the microstructure of teeth with bleaching agents to provide excellent esthetic results.

The KöR Whitening System (Evolve Dental Technologies Inc., www.korwhitening.com) closely follows the dictates of physics and chemistry necessary to provide predictable effectiveness for these extremely difficult cases. How deeply and how long peroxide bleaching factors penetrate the microstructure of teeth are two of the primary determinants of how successful and predictable whitening will be.8

Studies have confirmed that whitening gel in conventional whitening trays is only aggressively active for 20 to 30 minutes,9 which is due to leakage of saliva10 and sulcular fluid11 into the whitening trays. Both saliva and sulcular fluid are strongly concentrated with the natural antioxidant enzyme glutathione peroxidase, which destroys peroxide on contact.11,12

KöR-Seal™ Whitening Trays are designed to seal out salivary and sulcular fluid contamination, thereby greatly extending the effective activity time of the whitening gel—multiple hours instead of minutes.

All whitening gels are unstable chemicals.10,13 This instability is beneficial because it allows the whitening gel to rapidly break down in the mouth, releasing bleaching factors to whiten teeth. However, this same instability is also detrimental because the whitening gel starts degrading immediately after manufacture if not refrigerated.13 Heat—even room temperature—encountered during storage and shipping results in significant premature breakdown of the peroxide before it is even received by the dental practice.13,14

KöR Whitening is the first complete whitening system to be constantly refrigerated from the moment of manufacture until it is received cold-packed by the dental practice. This offers several benefits:

· Chemical stabilizers are not necessary and are not used. This results in even more instability and greater breakdown when placed in the mouth.

· Chemical stabilizers are greatly responsible for sensitivity during whitening because they increase the osmolarity of the whitening gel by as much as 11 times, and therefore, there is 11 times more pull on dentinal tubular fluid.15 Without chemical stabilizers, KöR gels have as little as 1/11 the osmolarity, resulting in significantly less sensitivity.

· KöR products are always received at virtually the same effectiveness as the day of manufacture.

Additionally, the KöR in-office Hydremide® Peroxide is the first whitening gel in a Tri-Barrel™ delivery system. This enables the chemistry to be separated into three barrels instead of only two (dual-barrel systems). There are many chemicals that cannot be mixed together until ready for use. The Tri-Barrel delivery enables the addition of more ingredients, thereby resulting in a more sophisticated, highly effective formulation for all whitening cases.

Case Presentation

A 50-year-old male patient presented to the author’s practice with a chief complaint of severe tooth discoloration attributed to the use of tetracycline in his youth (Figure 1).

During the examination, the patient discussed how he had spent his entire life hiding his teeth, and stated he was finally ready to do something about it. The patient had been previously informed by numerous dentists that his teeth could not be whitened, and the only way to correct the color was to cover the teeth with porcelain. The patient presented to the author’s practice expecting invasive porcelain cosmetic treatment.

Given the overall good oral health of this patient and because of the aggressiveness of the tooth preparations necessary with this intensity of tetracycline staining,16 the author felt porcelain restorations were not the first option to consider.

The author is a small-town dentist who had struggled in the past with the common limitations of whitening products and frequently researched the availability of more effective and predictable teeth-whitening systems. This research revealed one system that repeatedly demonstrated superior results over a broad spectrum of cases—the KöR Whitening System. The author determined KöR was the best solution for this case, and discussed the advantages and requirements of the KöR Whitening system with the patient to properly manage his expectations.

Clinical Protocol

The KöR-Seal Whitening trays are unique whitening trays fabricated with extreme precision, fitting nearly as well as crown-and-bridge restorations (Figure 2 and Figure 3). Due to the severity of tetracycline staining, the author elected to send the impressions for fabrication of the trays to the KöR Lab for the best possible precision of fit and seal.

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