Dentistry – Apparatus – Having static product shaping surface
Patent
1987-05-04
1988-11-01
Peshock, Robert
Dentistry
Apparatus
Having static product shaping surface
A61C 504
Patent
active
047815833
ABSTRACT:
A dental matrix band for engaging around a tooth comprises a plastic sheet member which includes a straight winding portion which can be wound into a coil and a curved tooth engaging portion which is wrapped around to form a tooth engaging band. A lock loop having inner and outer legs is engaged onto overlapping portions of the band to hold the band in position. The locking loop has interior notches which form a gingival inwardly directed bend and tooth contacting point and an elongated gingival open area to provide band's diametric adjustability prior to seating matrix on a tooth, as well as a crimp structure for crimping the occlusal edge of the band to form an occlusal concavity. The coil may be conical and polygonal in shape to more accurately receive a winding burr of a winding tool. The coil is rotatable to tighten the band around a tooth. A retaining end of the sheet material which is on the inside of the band is provided with an elongated laminate to reinforce the plastic band underlying the rotatable coil which is adjacent said retaining end. The coil is wound against this supporting, reinforced area which prevents underlying band from collapsing and being "wrapped-under" by coil which pulls the matrix material through the lock loop with winding of the coil.
REFERENCES:
patent: 3921299 (1975-11-01), Lazarus
patent: 4523909 (1985-06-01), Lazarus
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