Surgery – Instruments – Light application
Reexamination Certificate
1999-08-16
2001-12-04
Dvorak, Linda C. M. (Department: 3739)
Surgery
Instruments
Light application
C606S013000, C606S017000
Reexamination Certificate
active
06325791
ABSTRACT:
BACKGROUND
The present invention relates to a method of using a medical laser instrument for curing dental and surgical composite materials, which provides single line laser light generation from a diode laser.
Cipolla discloses in U.S. Pat. No. 5,616,141 an argon laser dental instrument and method for curing dental composites. However, the laser light consists of multi-line bands of wavelength, of which some wavelength lines must be filtered, since they are not useful for the purpose of curing. Therefore, the system displays an inefficient way of producing the laser light necessary for the curing. In addition, the laser system is an argon gas laser for which a high power cooling system must be supplied in order to operate it. Furthermore, the argon gas laser requires high voltage and a high current power source. Therefore, the instrument can not be made into a compact, hand-held, self-contained unit. A large stationary unit is required to be connected to a separate hand-held portion by optic fibers and cables. Furthermore, the output of the argon laser consists of many lines of wavelength from blue to green of which only the blue line of 488 nm is useful for curing. The beam is collimated and, therefore, has constant power along the propagation length of the beam. This results in uncontrolled curing and air bubble entrapment due to the fact that the surface layers begin to cure prior to the deeper layers.
Paghdiwala discloses a focused pulsed Er:YAG laser for cutting in dental applications in U.S. Pat. No. 5,401,171. The laser light is generated within a hand-held tool, but the power supply and water cooling pump are external and not self-contained in a hand-held instrument and there is no method disclosed for curing composites.
Kowalyk et al. discloses a method for removing tooth decay in U.S. Pat. No. 5,456,603 using pulsed, frequency doubled lasers emitting red, green, deep blue, and UV light attenuated by some dye material. Consequently, none of wavelengths described match the maximum absorption wavelength of medical composites for curing. The device is not a compact, hand-held, self-contained instrument.
Therefore, there remains a need to provide an efficient method for laser curing of dental and surgical composite materials in a cordless, portable, self-contained, hand-held instrument which generates a single, optimum wavelength for each use.
SUMMARY
An object of the present invention is to provide a practical and efficient method for curing medical composites with laser light from a diode laser.
Another object of the invention is to provide a method of curing medical composite materials that overcomes the problems of incomplete and inefficient curing of the prior art.
These and other objects are achieved in the present inventive method of use of a cordless medical laser by generating and focusing a single line wavelength laser light from a hand-held, self-contained, diode laser instrument. Dental or surgical composites are cured by a focused wavelength of laser light matching the optimum absorption wavelength of the composite material used. The focal point is moved through the composite from the deep layers to the surface to ensure complete curing.
These and other objects and advantages of the present invention will become more apparent from the following drawing and description of preferred embodiment.
REFERENCES:
patent: 5233283 (1993-08-01), Kennedy
patent: 5272716 (1993-12-01), Soltz et al.
patent: 5616141 (1997-04-01), Cipolla
patent: 6099520 (2000-08-01), Shimoji
Dvorak Linda C. M.
Vrellakos P. J.
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