Introduction
Stainless steel for surgical & dental instruments which are commonly used have been given under in grade tables related Austentic, Ferritic and Martensitic types of steels.You will find useful information in comparison of different grades.
These table are intended to relate former BS, En, German and Swedish grade designations to the current EN steel numbers, AISI grades (‘grades’ in (brackets) are not a true AISI grades) and UNS (Unified Numbering System) numbers. The table is based on the ‘Wrought’ ie long products (bars etc), flat products (plates etc) steel numbers published in En 10088 and related standards. Castings products use different compositions and so have their own steel numbers in EN 10283. The related castings grades in both EN 10283 and BS 3100 are included in the table.
Applications
Grades AISI 410 / 420 Types and are used extensively for dental and surgical instruments. They offer moderate corrosion resistance in comparison to other types of stainless steel (eg austenitic and duplex grades).They is used for applications where cutting edges, wear resistance and strength are required. A good combination of corrosion resistance and a range of mechanical strength via heat treatment can be expected from these grades.
Long service lives should be expected from martensitic stainless steel dental and surgical instruments, properly manufactured and subjected to appropriate cleaning procedures. For example, dental extraction forceps usually have an average service life of 15 years. There are some examples where such instruments have given 30 years service life. Other more delicate instruments and those with cutting edges may be expected to have a much shorter service lives, but they should not be expected to suffer corrosion damage.
Application Of Stainless-Steel Grades In different Types Of Surgical Instruments
Knives 302, 303, 420, 440
Osteotomes 410, 440
Reamers 410, 630
Rongeurs 410, 420
Scalpels 420, 440
Scissors 410, 420
Dissectors 410, 416, 420
Noncutting
Cannulae, Needle Vents 302, 303, 304
Forceps 302, 303, 304, 410
Retractors 302, 303, 304, 410, 416, 420, 431, 440
Specula 302, 303, 304, 316
Spreaders 302, 303, 304, 410, 416, 440
Clamps 303, 304, 410, 416, 420
Drills 303, 440
Handles 303, 304
Hammers, Mallets, Rulers,
Screws, Tunnelers 303
Punches 303, 410, 416, 420
Skin Hooks 303, 410, 416, 420
Suction Tubes 303, 304
Probes, Tongs 303, 440
Holders 304, 410
Clip Applicators, Dilators 410
Elevators 410, 420
Burrs 420F
Orthopedic Instruments 430
Needles 420
Table 1, Types Of Stainless Steel Used For Medical Instruments
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