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These tips, called CVD, are produced in a reactor in which a mixture of methane and hydrogen gases results in the formation of a single artificial diamond layer without space between the grains on the substrate (a molybdenum rod)
WORKING PRINCIPLE
CVD diamonds burs present unidirectional oscillating movement with maximal displacement ranging from 50 to 60 micron,at oscillating frequencies ranging from 25,000 to 32,000 Hz.
CVD diamond tip require only a slight touch to promote tooth grinding
This differs from the high speed handpiece, which is manipulated with pendulum movements over tooth structure.
Movement with maximal displacement ranging from 50 to 60 micron,at oscillating frequencies ranging from 25,000 to 32,000 Hz.
CVD diamond burs must be handled with light hand pressure,just enough to guide the instrument.
If too much load pressure is applied,the cutting effectiveness is reduced and pain,noise,and heat will be generated.
A greater application force reduces the cutting ability of the tip and may lead to fracture of the molybdenum substrate.
In addition the lack of irrigation of the ultrasound instrument on the treated surface may cause the tip to heat up and fracture.
This system doesn’t lose superficial diamond during cutting,subsequently extending the lifetime.
CVD feature significantly decrease the risk of metal contamination
CVD instrument allows the capability of working at high inclination angles,resulting in safer proximal finishing with less chance of hitting adjacent tooth.
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