Michael A Sharp

US Patent:

6457974, Oct 1, 2002

Filed:

Nov 18, 1999

Appl. No.:

09/442975

Inventors:

Michael C. Sharp - Centerport NY
Kevin Klocek - Boise ID
Stuart A. Mitchell - Harwinton CT

Assignee:

Parkell, Inc. - Farmingdale NY

International Classification:

A61C 302

US Classification:

433 88

Abstract:

A hand-held dental instrument for intraoral abrading of teeth includes a light-weight body made from a high temperature material and having internal bores or passageways for permitting fluid flow through the body. A rotatable nozzle assembly having internal fluid conduits therein is coupled to a distal end of the body such that a chamber is formed between the nozzle and the body. The chamber maintains fluid communication between an internal bore which is radially offset from a central axis bore of the body and an internal conduit of the nozzle assembly such that the nozzle can be rotated a full 360 degrees with respect to the body. The nozzle assembly includes a primary discharge port for directing flow of the air/abrasive material mixture and a secondary discharge port for directing a stream of liquid to a surface to be abraded. The primary discharge port of the nozzle head is preferably larger in diameter than the secondary discharge port and is disposed at an angle with respect to the secondary discharge port to meet at a point forward of the nozzle head. The handpiece is also provided with its own self-contained abrasive material supply which may be connected to the body or may be contained within the body.

US Patent:

59417021, Aug 24, 1999

Filed:

Feb 3, 1998

Appl. No.:

9/018079

Inventors:

Michael C. Sharp - Centerport NY
Kevin Klocek - Roslyn Heights NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 302

US Classification:

433 88

Abstract:

A handpiece for a dental instrument includes a solid body having internally reamed passageways through which a fluid is carried. The handpiece may be a dental air-abrading tool for etching hard surfaces to enhance bond strength of adhesives, which includes a solid body having internally reamed passageways through which a gaseous fluid and an abrasive material are carried. A connector is mounted on one end of the body for connecting one of the body's internal passageways to a supply of gaseous fluid and a nozzle is mounted on the other end of the body for directing the gaseous fluid to a surface. A supply of an abrasive material is coupled to another internal passageways of the body. The nozzle includes an internal mixing chamber for mixing the gaseous fluid and abrasive material entering therein from the body's internal passageways. A switch is mounted on the body for activating the flow of gaseous fluid and abrasive material through the body.

US Patent:

57305943, Mar 24, 1998

Filed:

Dec 5, 1996

Appl. No.:

8/760730

Inventors:

Michael C. Sharp - Centerport NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 107
A61C 308

US Classification:

433119

Abstract:

An ultrasonic dental scaler for use with a dental scaler insert having a resonant frequency associated therewith includes a handpiece adapted for removably receiving the dental scaler insert, an energizing coil mounted on the handpiece, whereby the energizing coil substantially surrounds the dental scaler insert. The ultrasonic dental scaler includes a selectively tunable oscillator circuit coupled to the energizing coil and which generates a control signal having an oscillation frequency associated therewith for vibrating the dental scaler insert in response thereto. Specifically, the selectively tunable oscillator circuit includes an automatic tuner for automatically altering the oscillation frequency associated with the control signal to be substantially equivalent to the resonant frequency associated with the dental scaler insert in response to the control signal being fed back thereto. Further, the selectively tunable oscillator circuit includes a manual tuner for altering the oscillation frequency associated with the control signal in response to manual adjustment of the manual tuner. The selectively tunable oscillator circuit also includes a switch which is operatively coupled to the automatic and manual tuners and the oscillator circuit and which selectively switches control of the alteration of the oscillation frequency between the automatic and manual tuners.

US Patent:

59115807, Jun 15, 1999

Filed:

Jan 30, 1997

Appl. No.:

8/791656

Inventors:

Michael C. Sharp - Centerport NY
Michael Barrett - Babylon NY
Nelson J. Gendusa - Manhasset NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 1100
A61C 900

US Classification:

433213

Abstract:

A method of making solid die dental models is provided, comprising preparing an impression of a dental structure and fabricating a dental model using said impression by depositing therein a flowable modeling material which self-sets under ambient conditions to a substantially solid elastomeric state. The flowable modeling material preferably has an initial viscosity of less than about 30,000 cps, and preferably sets to a substantially solid state in less than about an hour to provide a solid elastomeric state having a durometer hardness of at least about 60. The resulting dental model can be employed for construction of accurate and precise composite dental restorations.

US Patent:

60863692, Jul 11, 2000

Filed:

Jan 13, 1997

Appl. No.:

8/782342

Inventors:

Michael C. Sharp - Centerport NY
David Wuchinich - New York NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 107

US Classification:

433118

Abstract:

An ultrasonic dental scaler insert includes a tool coupled to a connecting body which is mechanically coupled to a transducer. When the insert is placed within an ultrasonic dental scaler device handpiece, the transducer produces ultrasonic vibrations which are transmitted to the tool via the connecting body. In order to reduce the noise generated by the operating scaler insert, the connecting body includes an elastomeric material which surrounds a portion of the connecting body. Additionally, a sleeve is provided which surrounds a portion of the connecting body providing a place to grasp the scaler insert during operation. The sleeve includes a bellows section which provides vibrational damping for the insert. Furthermore, the connecting body includes a vibration dampening bushing at an end adjacent the working tool.

US Patent:

54511615, Sep 19, 1995

Filed:

Aug 24, 1993

Appl. No.:

8/110857

Inventors:

Michael Sharp - Centerport NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 107
A61C 303
A61C 308

US Classification:

433119

Abstract:

A method and apparatus for vibrating a dental scaler insert at its resonant frequency which includes an energizing coil and an automatically tuned oscillating circuit is disclosed. The oscillating circuit is automatically tuned to vibrate a scaler insert at its resonant frequency in response to an impedance of the energizing coil. The energizing coil impedance is responsive to a scaler insert positioned within the energizing coil. Additionally, the dental scaler device can be operated with scaling inserts having different mechanical resonant frequencies associated therewith. Accordingly, dental scaler inserts resonant at about 25kHz or 30kHz may be inserted and operated by the dental scaler device of the present invention. The apparatus for vibrating a dental scaler may also include a feature permitting the operator to temporarily increase an amplitude of vibration of the scaler insert to enable the operator to dislodge stubborn calculus from a patient's teeth.

US Patent:

57185867, Feb 17, 1998

Filed:

Jan 30, 1997

Appl. No.:

8/791655

Inventors:

Michael C. Sharp - Centerport NY
Michael Barrett - Babylon NY
Nelson J. Gendusa - Manhasset NY

Assignee:

Parkell Products, Inc. - Farmingdale NY

International Classification:

A61C 900

US Classification:

433214

Abstract:

A polymeric composition is provided, comprising: a base component, comprising a first alkenyl-terminated short chain polydiorganosiloxane and a cross-linker; and a catalytic component, comprising a second alkenyl-terminated short chain polydiorganosiloxane and a catalyst, wherein: at least one of the base component and the catalytic component further comprises a filler; said first and second alkenyl-terminated short chain polydiorganosiloxanes together comprise from about 15 wt % to about 40 wt %, said cross-linker comprises from about 1 wt % to about 15 wt %, said catalyst comprises from about 0. 005 wt % to about 5 wt %, and said filler comprises from about 30 wt % to about 80 wt %, based on the total weight of the composition; and wherein the composition sets to a solid elastomeric state at about room temperature following mixing of said base component and said catalytic component. Also provided is a method of making a solid die dental model, comprising the steps of: preparing an impression of a dental structure, and fabricating a dental model using said impression by depositing therein a flowable modeling composition as described. A dental prosthetic, such as a composite restoration, can then be prepared using the solid die.

US Patent:

61901679, Feb 20, 2001

Filed:

Mar 23, 1998

Appl. No.:

9/046248

Inventors:

Michael C. Sharp - Centerport NY

Assignee:

Parkell, Inc. - Farmingdale NY

International Classification:

A61C 107
A61C 308

US Classification:

433119

Abstract:

An ultrasonic dental scaler for use with a dental scaler insert having a resonant frequency associated therewith includes a handpiece adapted for removably receiving the dental scaler insert, an energizing coil mounted on the handpiece, whereby the energizing coil substantially surrounds the dental scaler insert. The ultrasonic dental scaler includes a selectively tunable oscillator circuit coupled to the energizing coil and which generates a control signal having an oscillation frequency associated therewith for vibrating the dental scaler insert in response thereto. Specifically, the selectively tunable oscillator circuit includes an automatic tuner for automatically altering the oscillation frequency associated with the control signal to be substantially equivalent to the resonant frequency associated with the dental scaler insert in response to the control signal being fed back thereto. Further, the selectively tunable oscillator circuit includes a manual tuner for altering the oscillation frequency associated with the control signal in response to manual adjustment of the manual tuner. The selectively tunable oscillator circuit also includes a switch which is operatively coupled to the automatic and manual tuners and the oscillator circuit and which selectively switches control of the alteration of the oscillation frequency between the automatic and manual tuners.