YY 0620-2008Dentistry—Casting gold alloys (English PDF)

Foreword

This standard 5.1,5.2,5.3,5.4,5.5 and 5.6 are mandatory, others are recommended.

This revised standard adopts ISO 1562:2004 "Dentistry Gold Alloy." The main modifications are as follows.

The quote --- ISO 1562 standard ISO 6892, ISO 3696, ISO 9693, respectively, have been converted to GB/T 228, GB/T 6682 And YY 0621, this standard with the latter replace the former.

--- ISO 1562 does not contain a possible biological hazards qualitative and quantitative requirements given only biological evaluation literature Head record. The standard recommended in the evaluation of possible biological hazards, the see YY/T 0268. Reference increase The YY/T 0268.

--- ISO 1562 Standard Test Method for casting gold alloy chemical composition and density are not specified, the provisions of this standard were adopted GB/T 15072 And GB/T 1423 method, and these two national standards as reference standards.

--- ISO 1562 cites Vickers hardness test method standards, and provides the manufacturer "provides Vickers hardness" 7.4a) in, but There is no provision requiring the Vickers hardness, this increases the Vickers hardness standard requirements (5.6) and test methods (6.3.5).

--- The "corrosion 5.7", "5.8 tarnish resistance" and "5.9 Electrochemical Properties" to recommended.

--- "Break outer" and "nipper" phenomenon occurs due to the mechanical properties of test samples ISO 1562 design verification test, this standard Quasi modify mechanical properties of test samples ISO 1562 design, the deletion of the "cone shoulder sample", retained the "round clip Head "to" thread chuck "and" circular shoulder sample "(see 6.2.2 Figure 2), and an increase in the sample design of a threaded (See 6.2.2 Figure 1).

--- Prepared in accordance with the requirements of this standard of national standards for the ISO 1562 clauses were adjusted.

The "Sample 6", "7 sample preparation", "8 test" to "6 Test methods", "6.1 sample", "sample system 6.2 Preparation "," Test Method 6.3 "; the" information and instructions guide 9 "and" 10 logo "to" 7 packaging, labeling and instructions for use Book "," 5 Requirements "test method given in the adjustment to" 6 Test methods ", and in accordance with relevant state regulations supplement Charge related content.

This standard Annex A, Annex B and Annex C is informative appendix.

Introduction

Precious metal content (mass fraction) of 25% to 75% of the standard cast alloy, see ISO 8891.

As expected metal - base ceramic prosthesis using dental casting alloys and dual-use the precious metal content (mass fraction)

1 Scope

This standard gives the gold content (mass fraction) >=60%, and the total amount of gold and platinum group metals (platinum, palladium, iridium, ruthenium and rhodium) (mass fraction)

>=75% of dental casting gold alloys (hereinafter referred to as Gold Alloy) classification, requirements, test methods and packaging, labeling, instructions for use.

This standard is not applicable to the production of ceramic dental prosthesis attached devices and the cast alloy surface.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 228 metal materials at room temperature tensile test (GB/T 228-2002, idt ISO 6892:1998)

GB/T 1423 precious metals and their alloys density measurement method

GB/T 4340.1 Vickers hardness test - Part 1. Test methods

GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-92, neq ISO 3696. 1987)

GB/T 15072.1 ~ 15072.20 precious metals and their alloys - YY 0621 Dental PFM system (YY 0621-2008, ISO 9693-1999, MOD)

ISO 3585 laboratory glassware nature

3 Terms and Definitions

The following terms and definitions apply to this standard.