Oscillating Segment Disc
Innovative oscillating segment disc for interproximal enamel reduction.
For years, both cosmetic dentists and orthodontists have searched for the right product that can perform interproximal enamel reduction therapy (eg, during an Invisalign® [Align Technology, Inc] procedure), without using laboratory cutting discs that are not designed for that purpose. Even though cutting discs are not designed to be used intraorally, practitioners still continue to use them in this way. This is not a safe practice and dentists are strongly urged not to do so because of the risk of damaging soft tissue. Also, using a cutting disc with a disc guard causes the practitioner to have an obstructed view of the oral cavity.
Interproximal enamel reduction, also known as “stripping,” can correct a disproportion of tooth sizes in the lower and upper jaws, eliminates tooth crowding, and increases the durability of orthodontic treatment results by adapting the proximal contact areas, especially in cases of lower anterior teeth.
The known problems that arise with hand instruments, such as too little space for grinding movements or the regular occurrence of jamming, are only partly solved by using engine-driven rotary diamond discs.
With the support and professional advice of Professor Dr. Jost-Brinkmann of the Berlin Charité Dental Hospital in Germany, KOMET USA has now developed a reliable solution for safe and efficient oscillating stripping—the OS Discs (Figure 1). The new OS Discs are a 60° segment disc with a radius of 1.4 cm and a pivoting angle of 30° (Figure 2). This makes the OS Discs the proper instruments to be used even in the narrowest areas without the need for a disc guard.
Compared to the other rotary cutting discs with a full radius of up to 2.2 cm in diameter and a disc guard, the OS Discs offer the best features of interproximal enamel reduction in hard-to-reach areas. Thanks to their patented honeycomb design, the OS Discs provide optimal vision and excellent grinding efficiency leading to absolutely convincing results.
The OS Discs were designed to be used in the oscillating KOMET handpiece OS30 (Figure 3). When using the micro-motor at full capacity, an effective performance of 5,000 oscillations per minute is reached. It is also possible to use the OS30 in an air motor. At the motor’s maximum capacity, an effective performance of 2,500 oscillations per minute can be reached, and the OS Discs must be guided from the occlusal side through the contact point in a slow but continuous movement. Fifteen different OS Discs are available: nine in fine grit, six in medium grit. Out of the 15, eight are one-sided and seven are two-sided, and come in a variety of thicknesses (0.13 mm to 0.45 mm).
To minimize the risk of removing excessive enamel substance, the tooth width should be measured with a sliding caliper before use and also during the enamel reduction (Figure 4). Alternatively, a thickness gauge can be used to measure the thickness of the removed enamel.
Before stripping, the interdental contact should be eliminated using the KOMET diamond strips with honeycomb design (the yellow strip should be used first because it is the thinnest). According to the amount of enamel to be reduced, the corresponding segment disc type is chosen: OS Discs with medium grit (blue ring) for higher substance removal (Figure 5) and with fine grit (red ring) for less substance removal (Figure 6). The OS Discs are used in subsequent order (from the thinnest to the thickest). The OS Disc is moved in an occlusal to cervical direction, and the treated teeth should be aligned in a straight line.
A Composite Polishing System Kit 4564 (KOMET USA) can be used for polishing, thus completing the procedure.
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