The General Cutting Contra Handpiece is powered by either an air-motor or electronic micromotor for use in general dentistry. The device is intended for cutting and grinding teeth, cavity preparations, tooth and crown preparations, finishing and trimming teeth and filling materials and removal of crowns and filling materials.

Device Description

The General Cutting Contra Handpiece features an allowable maximum motor speed at 40,000 min-1 . The handpieces are provided optic and non-optic and are designed with a contra-angle appearance. Models are available to be connected directly onto motors compliant to ISO 3964. Available handpieces include the S-Max M Contra Series, Ti-Max X Contra Series, Ti-Max Z Contra Series and the Ti-Max nano Series.

AI/ML Overview

The provided text describes a dental handpiece and does not contain information about an AI/ML device. Therefore, I cannot extract acceptance criteria or study details relevant to an AI/ML device from this document.

The document discusses:

Device Name: General Cutting Contra Handpiece (a dental instrument)
Manufacturer: NAKANISHI INC.
Intended Use: Cutting and grinding teeth, cavity preparations, etc., in general dentistry.
Regulatory Classification: Class I
Bench Testing: Conformance to technical standards, internal specifications, and FDA guidance documents related to dental handpieces (e.g., sterilization, biocompatibility, electrical safety).
Substantial Equivalence: Claimed based on similarities to predicate dental handpieces in intended use, operation principles, design, and medical use.

Since this is not an AI/ML device, the requested information regarding AI/ML-specific acceptance criteria, study details, sample sizes, expert qualifications, adjudication methods, MRMC studies, standalone performance, training sets, and ground truth establishment for AI/ML does not apply to this document.

Summary

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Submitter	NAKANISHI INC.700 ShimohinataKanuma-Shi, Tochigi-Ken Japan 322-8666
ContactPerson	Mr. Kimihiko SatohGeneral Manager, Regulatory Affairs, R&D DivisionTEL: +81-289-64-3380FAX: +81-289-62-6665k-satoh@nsk-nakanishi.co.jp
Date Prepared	April 15, 2019
Trade Name	General Cutting Contra Handpiece
CommonName	Handpiece, Contra-And Right-Angle Attachment, Dental
ClassificationName	Dental Handpiece and Accessories
Product Code	EGS	Class I	872.4200
PredicateDevice	K972569	NAKANISHI INC.	E-Type Speed IncreaserContra Angle, ES-95
ReferenceDevices	K113655	NAKANISHI, INC.	Ti-Max X Turbine
	K073652	NAKAMURA	ND LOWSPEEDAIRMOTOR
DeviceDescription	The General Cutting Contra Handpiece features an allowable maximum motorspeed at $40,000 min^{-1}$ . The handpieces are provided optic and non-optic and aredesigned with a contra-angle appearance. Models are available to be connecteddirectly onto motors compliant to ISO 3964. Available handpieces include theS-Max M Contra Series, Ti-Max X Contra Series, Ti-Max Z Contra Series andthe Ti-Max nano Series.
Indications forUse	The General Cutting Contra Handpiece is powered by either an air-motor orelectronic micromotor for use in general dentistry. The device is intended forcutting and grinding teeth, cavity preparations, tooth and crown preparations,finishing and trimming teeth and filling materials and removal of crowns andfilling materials.
Summary ofTechnologicalCharacteristics	As with the predicate devices referenced above, the General Cutting ContraHandpiece is intended for dental treatment. The handpieces are powered byeither an air-motor or electronic micro motors compliant to ISO 14457 withcouplings compliant to [ISO 3964 (EN ISO 3964)]. Friction Grip Burs andContra Angle Burs that conform to ISO 1797-1 (EN ISO 1797) are to be usedwith the General Cutting Contra Handpiece. The allowable maximum motorspeed rotation for the handpieces is at $40,000 min^{-1}$ . The handpieces are available

Image /page/0/Picture/2 description: In the image, a hand wearing a white glove is holding a blue plastic tool. The tool has a unique design with sharp edges and points. The words "Powerful Partners" are written at the bottom of the image. The hand is holding the tool in a way that suggests it is being used for a precise task.

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with fiber optic and non-optic. All models include a water spray feature. The General Cutting Contra Handpiece is provided non-sterile, so it must be sterilized prior to first use and sterilized after each subsequent use using steam sterilization (moist heat sterilization).

The proposed device shares technological characteristics with the predicate device. The proposed device also has some differences in technological characteristics from those of the predicate device. Any differences in the technological characteristics are minor and reflect market strategy and/or perceived user preferences.

	Proposed Device:NAKANISHI INC.[K182999]	Predicate Device:NAKANISHI INC.[K972569]	Reference Device:NAKANISHI INC.[K113655]	Reference Device:NAKAMURADENTAL[K073652]	CouplingType	ISO 3964 (EN ISO3964) StandardCoupling	ISO 3964 StandardCoupling	Nakanishi (NSK),KaVo, W&H, BienAir, Sirona	ISO 3964 StandardCoupling
TradeName	General CuttingContra Handpiece	E-Type SpeedIncreaser ContraAngle, ES-95	Ti-Max X TurbineSeries	ND E-TYPECONTRAANGLE	Burs	ISO 1797-1 (Type1)ISO 1797-1 (Type3)	ISO-1797-1 (Type3)(1.6mmor .0630in)	ISO 1797-1 Type 3	EC-20L : ISO 1797-1(Type1)EC-30BL: ISO 1797-1(Type1)EG-20L : ISO 1797-1(Type1)EGG-20L:Unknown
ModelNumbers	S-Max M:M15L, M15, M25L,M25, M95L, M95Ti-Max X:X10L, X10, X12L,X12, X15L, X15,X20L, X20, X25L,X25, X85, X85L, X95,X95LTi-Max Z:Z10L, Z15L, Z25L,Z85L, Z95LTi-Max nano:nano15LS, nano25LS,nano95LS	ES-95	Miniature Head:X500; X500L;X500K; X500KL;X500SL; X500WL;X500BLStandard Head:X600; X600L;X600K; X600KL;X650L; X650KL;X600SL; X600WL;X600BL;X600WLED;X600BLEDTorque Head:X700; X700L;X700K : X700KL:X700SL; X700WL;X700BL;	EC-20LEC-30BLEG-20LEGG-20L	MaxRotationSpeed(motor)	$40,000min^{-1}$ max	$40,000min^{-1}$ max	Miniature Head:(500): 390,000 –450,000Standard Head:(600): 380,000 –440,000Torque Head:(700): 300,000 –360,000	EC-20L : $20,000min^{-1}$EC-30BL : $30,000min^{-1}$EG-20L : $20,000min^{-1}$EGG-20L:Unknown
Indicationfor Use	The General CuttingContra Handpiece ispowered by either anair-motor or electronicmicromotor for use ingeneral dentistry. Thedevice is intended forcutting and grindingteeth,cavitypreparations, tooth andcrown preparations,finishing and trimmingteeth and fillingmaterials and removalof crowns and fillingmaterials.	The device isintended for usewhere high speedsuch as 200,000 rpmis required in generaldentistry with orwithout use ofcoolant; such ascutting a tooth forcavity and/or crownpreparation andfinishing, cuttingand/or finishing ofdentures, denturebases, crowns, inlaysand metal plates.The device is drivenby an electricalmicrometer or an airmotor handpiece thathas the ISO-3964coupling.	The Ti-Max X Seriesis an air-powereddental handpieceintended for removingcarious material,reducing hard toothstructure, cavitypreparation, finishingtooth preparations andrestorations andpolishing teeth.	ND e-type contra p ispowered by either lowspeed air-motor orelectric micromotorfor removing cariousmaterial and excessfilling material, cavityand crownpreparation, root	Gear RatioMaxrotationspeed(handpiece)	16:1 Reduction-$2,500min^{-1}$10:1 Reduction-$4,000min^{-1}$4:1 Reduction-$10,000min^{-1}$1:1 Direct Drive-$40,000min^{-1}$1:5 Increasing-$200,000min^{-1}$	1:5 Increasing-$200,000min^{-1}$	N/A	16:1 Reduction:Unknown4:1 Reduction:$5,000min^{-1}$1:1 Direct Drive:$30,000min^{-1}$
Weight	53.5g - 78.5g	62.5 g	36.7 – 52.5g	Unknown	Cleaners/Lubricants	NSK PANA SPRAYPlus (K163483)	Mineral Oil	Care3 Plus automatichandpiececleaning/lubricationtabletop unit[K081811]	YOSHIDALubrication Oil Spray
SterilizationMethod	Steam Autoclave(Moist Heat)	Steam Autoclave(Moist Heat)	Steam Autoclave(Moist Heat)	Steam Autoclave(Moist Heat)
SterilizationStandard	ANSI/AAMI/ISO17665-1:2006	ISO 17665-1	EN ISO 17665-1:2006	Unknown

Image /page/1/Picture/4 description: The image shows a hand wearing a white glove holding a blue object with the text "Powerful Partners" below. The blue object appears to be a stylized logo or design element. The hand is positioned in a way that suggests it is presenting or showcasing the blue object. The background is plain, drawing attention to the hand and the blue object.

NAKANISHI INC. Headquarters : 700 Shimohihata Kanuma-shi Tochigi 322-8666, Japan www.nsk-inc.com Tokyo Office : MY Building 1-13-3 Ueno Taito-ku Tokyo 110-0005, Japan

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NSK

Summary of Performance Testing

The General Cutting Contra Handpiece was developed and is produced under considerations of all applicable technical standards, internal specifications, and FDA guidance documents. The product's conformance with applicable international and internal standards was verified in the course of bench testing. Tests were performed on the handpiece including verification/validation testing to internal functional specifications which demonstrated that the device is substantially equivalent and complies with FDA requirements stated in Guidance Document "Dental Handpieces - Premarket Notification [510(k)] Submissions - Guidance for Industry and FDA Staff'. Sterilization has been validated in conformance to the FDA recognized consensus standard AAMI/ANSI/ISO 17665-1:2006; "Sterilization of Health Care Products – Moist

Image /page/2/Picture/4 description: In the image, a hand wearing a white glove is holding a blue surgical instrument. The instrument has a unique design with sharp edges and angles. The words "Powerful Partners" are visible at the bottom of the image.

Section 5: Page 3 of 4

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Image /page/3/Picture/0 description: The image shows the logo for NSK, a Japanese manufacturer of bearings. The logo is white and is set against a blue background. The letters "NSK" are in a bold, sans-serif font, with the top of the "N" extending over the "S" and "K".

Heat - Part 1: Requirements for the Development, Validation, and Routine Control of a Sterilization Process for Medical Devices." Documentation was provided demonstrating that the General Cutting Contra Handpiece complies with the FDA requirements stated in Guidance for the "Reprocessing Medical Devices in Health Care Settings: Validation Methods and Labeling - Guidance for Industry and Food and Drug Administration Staff". Biocompatibility evaluations were selected in accordance with AAMI/ANSI/ISO 10993-1: "Biological evaluation of medical devices - Part 1: Evaluation and testing" and FDA Guidance "Use of International Standard ISO 10993-1, "Biological evaluation of medical devices - Part 1: Evaluation and testing within a risk management process- Guidance for Industry and Food and Drug Administration Staff". In addition, testing for electrical safety was performed in accordance with ISO 14457.

NAKANISHI, INC. considers the General Cutting Contra Handpiece to be Conclusion substantially equivalent to the predicate devices listed above. This conclusion is based on the similarities in primary intended use, principles of operation, functional design, and established medical use.
Image /page/3/Picture/3 description: The image shows a hand wearing a white glove holding a blue surgical instrument. The instrument has a sleek, modern design with sharp edges and a pointed tip. The words "Powerful Partners" are written in a small font at the bottom of the image.

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Indications for Use

510(k) Number (if known) K182999

Device Name General Cutting Contra Handpiece

Indications for Use (Describe)

Type of Use (Select one or both, as applicable)

2 Prescription Use (Part 21 CFR 801 Subpart D)

_ Over-The-Counter Use (21 CFR 801 Subpart C)

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FOR FDA USE ONLY

Concurrence of Center for Devices and Radiological Health (CDRH) (Signature)

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April 16, 2019

Nakanishi Inc. % Katie Reneson Regulatory Specialist Ken Block Consulting 800 East Campbell Road, Suite 202 Richardson, Texas 75081

Re: K182999

Trade/Device Name: General Cutting Contra Handpiece Regulation Number: 21 CFR 872.4200 Regulation Name: Dental Handpiece And Accessories Regulatory Class: Class I Product Code: EGS Dated: March 15, 2019 Received: March 18, 2019

Dear Katie Reneson:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.

Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal

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statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/CombinationProducts/GuidanceRegulatoryInformation/ucm597488.htm); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm.

For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/) and CDRH Learn (http://www.fda.gov/Training/CDRHLearn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (http://www.fda.gov/DICE) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).

Sincerely,

for Tina Kiang, Ph.D. Acting Director Division of Anesthesiology, General Hospital, Respiratory, Infection Control, and Dental Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

Regulation Number and Section

§ 872.4200 Dental handpiece and accessories.

(a)
Identification. A dental handpiece and accessories is an AC-powered, water-powered, air-powered, or belt-driven, hand-held device that may include a foot controller for regulation of speed and direction of rotation or a contra-angle attachment for difficult to reach areas intended to prepare dental cavities for restorations, such as fillings, and for cleaning teeth.(b)
Classification. Class I.