(90 days)
KATANA Zirconia Block is used for the fabrication of the ceramic restorations (frameworks, FCZ crowns, FCZ bridges (14Z L only), inlays, onlays and veneers).
The subject device, KATANA Zirconia Block is a pre-sintered zirconia block composed of yttrium stabilized zirconia, which is designed for CEREC milling systems. The subject device is meant to be end-user sintered after milling for the fabrication of dental restorations. KATANA Zirconia Block STML has 3 sizes (12Z, 14Z and 14Z L) and has 14 shade variations: (A1, A2, A3, A3.5, A4, B1, B2, B3, C1, C2, C3, D2, D3, NW). KATANA Zirconia Block ST has 1 size: (12Z) and has 1 shade variation: (CL). STML consists of 4 gradated shade layers and ST is mono color. They are classified as a Type II and Class 4a) material by ISO 6872.
This document describes the premarket notification for the KATANA Zirconia Block and demonstrates its substantial equivalence to previously cleared predicate and reference devices.
Here's an analysis of the provided text regarding acceptance criteria and the study that proves the device meets them:
1. A table of acceptance criteria and the reported device performance
The document provides a table (Table 3-6-3) comparing the subject device (KATANA Zirconia Block (14Z L)), the predicate device (KATANA Zirconia Block (12Z, 14Z)), and the reference device (KATANA Zirconia Disc (ST, STML)) against requirements specified in ISO 6872:2015 (Dentistry — Ceramic materials — Part 1: Dental ceramics).
| Acceptance Criteria (from ISO 6872:2015) | Requirement | Reported Device Performance (Subject Device: KATANA Zirconia Block (14Z L)) |
|---|---|---|
| Uniformity (5.1) | The inorganic pigment(s) used to produce the color of a fired dental ceramic and any organic colorants (for color coding) shall be uniformly dispersed... Check by visual inspection. | COMPLIES |
| Freedom from extraneous materials (5.2.1) | Dental ceramic materials shall be free from extraneous materials when assessed by visual inspection. | COMPLIES |
| Freedom from extraneous materials (5.2.2) | Dental ceramic materials shall not have an activity concentration of more than 1.0 Bq·g-1 of 238U. Test in accordance with 7.2.2. | COMPLIES |
| Flexural strength (5.4) | Equal to or greater than 500 MPa. | COMPLIES |
| Chemical solubility (5.4) | Less than 100 µg/cm². | COMPLIES |
| Coefficient of thermal expansion (5.4) | The coefficient of thermal expansion of the ceramics shall not deviate by more than 0.5 × 10-6 K-1 from the value stated by the manufacturer. (The value stated by the manufacturer: 9.8 × 10-6 K-1) | COMPLIES |
"COMPLIES" indicates that the test value was within the acceptable range to pass the testing in compliance with the requirements of ISO 6872:2015.
2. Sample sized used for the test set and the data provenance (e.g. country of origin of the data, retrospective or prospective)
The document does not explicitly state the sample sizes used for the bench testing. It refers to a "comparative study performed according to ISO 6872:2015," which typically involves specific sample sizes dictated by the standard for each test. The data provenance (country of origin, retrospective/prospective) is not mentioned. However, the applicant is "Kuraray Noritake Dental Inc." in Japan, suggesting the testing was likely conducted by or for this Japanese company.
3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts (e.g. radiologist with 10 years of experience)
This is a physical/mechanical properties test for a dental ceramic block, not a diagnostic medical device that requires expert interpretation. Therefore, there are no "experts" in the sense of medical professionals establishing a ground truth based on clinical evaluation. The ground truth for these tests is established by adhering to the standards and methods outlined in ISO 6872:2015. Visual inspections (e.g., for uniformity, absence of extraneous materials) would be performed by trained technicians or quality control personnel.
4. Adjudication method (e.g. 2+1, 3+1, none) for the test set
Since this is a bench testing scenario focusing on physical and chemical properties against a standard, an adjudication method for conflicting expert opinions (like 2+1 or 3+1) is not applicable. The compliance is determined by instrumental measurements and visual inspections against quantitative and qualitative criteria defined by ISO 6872:2015.
5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance
No MRMC comparative effectiveness study was performed. This device is a dental material (zirconia block) and not an AI-powered diagnostic tool requiring human reader assistance.
6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done
This is not an algorithm-based device. It is a physical dental material. Therefore, no standalone algorithm performance study was done. The performance evaluation is based on standard material testing methods.
7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.)
The ground truth for this device's performance evaluation is established by international standards (ISO 6872:2015). The performance is measured against the pre-defined limits and specifications within this standard, rather than expert consensus on clinical cases, pathology, or outcomes data.
8. The sample size for the training set
This is not an AI/machine learning device; therefore, there is no "training set" in the computational sense. The material is manufactured and tested according to quality control procedures to meet the specified standards.
9. How the ground truth for the training set was established
As there is no training set for an algorithm, this question is not applicable.
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Image /page/0/Picture/0 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
May 23, 2019
Kuraray Noritake Dental Inc. Yasujiro Ohara Manager, Quality Assurance Department Ote Center Bldg. 7F Chiyoda-ku, 100-0004 JAPAN
Re: K190436
Trade/Device Name: KATANA Zirconia Block Regulation Number: 21 CFR 872.6660 Regulation Name: Porcelain Powder For Clinical Use Regulatory Class: Class II Product Code: EIH Dated: February 20, 2019 Received: February 22, 2019
Dear Yasujiro Ohara:
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,
Malvina B Eydelman, M.D. Director OHT1: Office of Ophthalmic, Anesthesia, Respiratory, ENT and Dental Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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Indications for Use
510(k) Number (if known): K190436
Device Name: KATANA Zirconia Block
Indications for Use:
KATANA Zirconia Block is used for the fabrication of the ceramic restorations (frameworks, FCZ crowns, FCZ bridges (14Z L only), inlays, onlays and veneers).
Prescription Use _____________________________________________________________________________________________________________________________________________________________ (Part 21 CFR 801 Subpart D)
AND/OR
Over-The-Counter Use (21 CFR 801 Subpart C)
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
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Date: May 13, 2019
510(k) number: K190436
510(k) Summary
3-1. 510(k) owner (submitter)
-
- Name
-
- Address
-
- Contact person
- Contact person in US
Kuraray Noritake Dental Inc.
1621 Sakazu, Kurashiki, Okayama 710-0801, Japan
Yasujiro Ohara Manager Quality Assurance Department
Manabu Suzuki Director KURARAY AMERICA, INC. 33 Maiden Lane, 6th Floor, New York, NY 10038 Tel: (212)-986-2230 (Ext. 115) or (800)-879-1676 Fax: (212)-867-3543
3-2. Name of Device
-
- Trade / Proprietary name
-
- Classification name
-
- Common name
3-3. Predicate device
KATANA Zirconia Block
3-4. Reference device KATANA Zirconia
KATANA Zirconia Block
Porcelain powder for clinical use (21 CFR section 872.6660. Product code: EIH)
Dental ceramics
510(k) Number Classification: Product Code: 21 CFR Section: Applicant:
K170986 Porcelain powder for clinical use EIH 872.6660 Kuraray Noritake Dental Inc.
510(k) Number Classification: Product Code: 21 CFR Section: Applicant:
K143439 Porcelain powder for clinical use EIH 872.6660 Kuraray Noritake Dental Inc.
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3-4. Device Description
In this submission, we add a new size [14Z L (a: 17.8×b: 19.2×c: 40.0 mm)] to KATANA Zirconia Block (K170986) and expand to the same indications as KATANA Zirconia (K143439).
Device description of KATANA Zirconia Block is modified as follows.
The subject device, KATANA Zirconia Block is a pre-sintered zirconia block composed of yttrium stabilized zirconia, which is designed for CEREC milling systems. The subject device is meant to be end-user sintered after milling for the fabrication of dental restorations.
KATANA Zirconia Block STML has 3 sizes (12Z, 14Z and 14Z L) and has 14 shade variations: (A1, A2, A3, A3.5, A4, B1, B2, B3, C1, C2, C3, D2, D3, NW). KATANA Zirconia Block ST has 1 size: (12Z) and has 1 shade variation: (CL). STML consists of 4 gradated shade layers and ST is mono color. They are classified as a Type II and Class 4a) material by ISO 6872.
3-5. Statement of Indications for use
KATANA Zirconia Block is used for the fabrication of the ceramic restorations (frameworks, FCZ crowns, FCZ bridges (14Z L only), inlays, onlays and veneers).
3-6. Substantial Equivalence Discussion
- Indications for use
The indications of the subject device, the predicate device and the reference device are as listed on the following table.
| Subject device(a modification to thepredicate device) | Predicate device(K170986) | Reference device(K143439) | |
|---|---|---|---|
| Tradename | KATANA Zirconia Block | KATANA Zirconia Block | KATANA Zirconia |
| Size | 12Z: 15.3×19.2×20.2(mm)14Z: 17.8×19.2×20.2(mm)14Z L: 17.8×19.2×40.0(mm) | 12Z: 15.3×19.2×20.2(mm)14Z: 17.8×19.2×20.2(mm) | $\phi$ 98.5×14 to $\phi$ 98.5×22 (mm) |
| Indications for use | KATANA Zirconia Block isused for the fabrication of theceramic restorations(frameworks, FCZ crowns,FCZ bridges (14Z L), inlays,onlays and veneers). | KATANA Zirconia Block isused for the fabrication of theceramic restorations (FCZcrowns, inlays, onlays andveneers). | "KATANA Zirconia" is usedfor the fabrication of theceramic restorations(frameworks, FCZ crowns,FCZ bridges, inlays, onlaysand veneers). |
| Table 3-6-1. Indications for useof the subject device, the predicate device and the reference device | ||||
|---|---|---|---|---|
| ------------------------------------------------------------------------------------------------------ | -- | -- | -- | -- |
The indications for useof the subject device was written up based on the predicate device (KATANA Zirconia Block) and the reference device (KATANA Zirconia).
This new size is larger than predicate device, and smaller than reference device (K143439), whose size is 98.5×14 to 22 (mm).Therefore, the indications for useof the subject device is substantially equivalent to the predicate device and the reference device.
2) Chemical ingredients
All ingredients in the subject device have been used in the predicate device and the reference device. Regarding the above predicate device and the reference device, there have not been any reported problems or recalls according to the post-market adverse event reporting requirements in the US. Accordingly, it was concluded that the subject device is substantially equivalent in biocompatibility to the predicate device and the reference device.
- Technological characteristics
Table 3-6-2 compares the subject device to the predicate device and the reference device with respect to technological characteristics.
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| Subject device(a modification to thepredicate device) | predicate device(K170986) | Remark | |
|---|---|---|---|
| Tradename | KATANA Zirconia Block | KATANA Zirconia Block | Subject device andpredicate device are thesame except for new size.This new size is larger thanpredicate device, andsmaller than referencedevice (K143439), whosesize is $\phi$ 98.5 × 14 to 22(mm), and comply withISO 6872: 2015 as shownin 3-7. From the above,Subject device issubstantially equivalent to |
| Type | ST&STML | ST&STML | |
| Shapes | Block | Block | |
| Sizes | 12Z: 15.3×19.2×20.2(mm)14Z: 17.8×19.2×20.2(mm)14Z L: 17.8×19.2×40.0(mm) | 12Z: 15.3×19.2×20.2(mm)14Z: 17.8×19.2×20.2(mm) | |
| Shades | A1, A2, A3, A4, B1, B2,B3, C1, C2, C3, D2, D3,NW, CL | A1, A2, A3, A4, B1, B2,B3, C1, C2, C3, D2, D3,NW, CL | in 3-7. From the above,Subject device issubstantially equivalent to |
| Materials | ZrO2+Y2O3+Pigments | ZrO2+Y2O3+Pigments | predicate device and |
| Sinteringstatus | 1550°C-1560°C | 1550°C-1560°C | reference device. |
| Sterilitystatus | Non-sterile | Non-sterile | |
| Millingtechnique | Place the block into themilling machine; thenbegin the milling processfollowing the millingsystems technicalinstructions. | Place the block into themilling machine; thenbegin the milling processfollowing the millingsystems technicalinstructions. |
Table 3-6-2. Comparison of Technological characteristics
- Non clinical Perfomance Testing
Physical and mechanical properties of the subject device were evaluated according to ISO 6872: 2015. According to ISO 6872:2015, the subject device is classified into the following:
-
Type II: All other forms of ceramic products.
-
Class 4: a) Monolithic ceramic for three-unit prostheses involving molar restoration.
The results of comparative study performed according to ISO 6872: 2015 were indicated Table 3-6-3. The results show the subject device, the predicate device and the reference device comply with ISO 6872: 2015.
Therefore, the performance of the subject device is substantially equivalent to the predicate device and the reference device.
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| Section | Subject device(a modification to thepredicate device) | Predicate device(K170986) | Reference device(K143439) | |||
|---|---|---|---|---|---|---|
| Requirement | KATANA ZirconiaBlock (14Z L) | KATANA ZirconiaBlock (12Z, 14Z) | KATANA ZirconiaDisc (ST, STML) | |||
| 5.1Uniformity | The inorganic pigment(s) used toproduce the color of a fired dentalceramic and any organic colorants (forcolor coding) shall be uniformlydispersed throughout the dentalceramic material and in powderedceramic products, no segregation ofthe pigment(s) shall take place whenthe powder is mixed as in 7.1.3. Checkby visual inspection. | COMPLIES | COMPLIES | COMPLIES | ||
| 5.2 | Freedomfromextraneousmaterials | 5.2.1 | Dental ceramic materials shall be freefrom extraneous materials whenassessed by visual inspection. | COMPLIES | COMPLIES | COMPLIES |
| 5.2.2 | Dental ceramic materials shall nothave an activity concentration of morethan 1.0 Bq·g-1 of 238U. Test inaccordance with 7.2.2. | COMPLIES | COMPLIES | COMPLIES | ||
| 5.4 | Physicalandchemicalproperties | Flexuralstrength | Equal to or greater than 500MPa. | COMPLIES | COMPLIES | COMPLIES |
| Chemicalsolubility | Less than 100µg/cm² | COMPLIES | COMPLIES | COMPLIES | ||
| Thecoefficientof thermalexpansion | The coefficient of thermal expansionof the ceramics shall not deviate bymore than 0.5 × 10-6 K-1 from thevalue stated by the manufacturer.(The value stated by themanufacturer : 9.8×10-6K-1) | COMPLIES | COMPLIES | COMPLIES |
Table 3-6-3. The results of comparative study performed according to ISO 6872:2015
"COMPLIES" means that test value was in the acceptable range to pass the testing in compliance with the requirements of ISO 6872: 2015.
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The subject device is categorized into the external communicating device (dentin) and permanent contact device.
We evaluated according to ISO 10993-1: 2009, the subject device have the same ingredients and manufacturing process as the predicate device and the reference device and therefore no further biocompatibility testing was necessary.
3-7. Conclusion
The comparison for indications for use, chemical ingredients, technological characteristics shows that the subject device is substantially equivalent to the predicate device and the reference device.
§ 872.6660 Porcelain powder for clinical use.
(a)
Identification. Porcelain powder for clinical use is a device consisting of a mixture of kaolin, felspar, quartz, or other substances intended for use in the production of artificial teeth in fixed or removable dentures, of jacket crowns, facings, and veneers. The device is used in prosthetic dentistry by heating the powder mixture to a high temperature in an oven to produce a hard prosthesis with a glass-like finish.(b)
Classification. Class II.