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dental matrix retainer

https://mhc.andornot.com/en/permalink/artifact13311
Dates
1932
1950
circa 1932-1950
Collection
Dr. Ralph and Mrs. Olga Crawford Canadian Dental Collection
Category
Diagnostic & Treatment Artifacts
Classification
Dental
Accession Number
010020189
Description
Silver metal dental matrix retainer; U-shaped piece of metal with cylinder coming down from top centre and large screw at top of cylinder; ends feature triangular points facing inward; two rectangular pieces of metal coming from bottom of cylinder are hinged to sides of U-shaped piece; when screw i…
  2 images  
Accession Number
010020189
Collection
Dr. Ralph and Mrs. Olga Crawford Canadian Dental Collection
Category
Diagnostic & Treatment Artifacts
Classification
Dental
MeSH Heading
Dentistry, Operative
Dental Equipment
MM= Dental Restoration, Permanent -- apparatus
Description
Silver metal dental matrix retainer; U-shaped piece of metal with cylinder coming down from top centre and large screw at top of cylinder; ends feature triangular points facing inward; two rectangular pieces of metal coming from bottom of cylinder are hinged to sides of U-shaped piece; when screw is turned, sides of U-shaped piece move closer together or further apart.
Number Of Parts
1
Provenance
Transfer from the Dental Canada Fund; previously housed in the Dentistry Canada Museum (Ottawa)
Site Made (Country)
United States of America
Dates
1932
1950
circa 1932-1950
Date Remarks
Based on patent date
Material
metal: silver
Inscriptions
Engraved on retainer: "IVORY // NO.1RET // PAT. 1868981"
Permanent Location
Storage Room 0010
0010-B
Dimension Notes
Length 6.4 cm x Width 3.0 cm x Depth 1.5 cm
Condition Remarks
Metal slightly tarnished in places
Copy Type
Original
Reference Types
Internet
JPG
Reference Comments
"Free Patents Online" website
CD #10
Research Facts
Dr Ralph and Mrs Olga Crawford donated their extensive Canadian dental collection to the DCF to create the museum in 1997; further donations were received while Dr Crawford was Curator Emeritus at the Dental Canada Museum until its closure in 2008; a matrix band, consisting of a small, thin sheet of metal, was held tight alongside the tooth being filled to provide a smooth, curved wall against which the filling could be packed; a retainer was used to hold it in place; this model featured pointed knobs on its end, which could attach securely to the matrix, ensuring it would not become disengaged
Images
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