To the ends of a matrix band to hold it in place around a tooth that is being prepared for a dental restoration.
N.12 with shield (Similar to N. 1 or N. 12A)
For matrices Ivory N.1 (367140, 367150, 367160, 367170, 367180, 367190)
Adjustable matrix retainer to hold bands of stainless steel that provide the missing wall for the single proximal surface restoration (MO or DO). One margin band is slightly projected, which is kept toward the gingiva on the cavity side. Free end of matrix band are kept on the non cavity side.
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