DS 110 Unit 1 - Matrix System

Spot-welded band

A form fitted custom-made band adapted by three spot welds

Outer guide slot

aka: guide channels; located at the end of the retainer and serve as channels to guide the loop of the matrix band (B)

Diagonal slot

A slot within the boxlike structure used to position the ends of the matrix band to the vise (A)

Celluloid strip (Mylar strip)

Clear plastic strip used to provide a temporary interproximal wall for the restoration of an anterior tooth surface; composite restorations

Universal retainer (tofflemire retainer)

Dental device used to hold a matrix band in place during restoration of a class II cavity

Supervision level a LDA in MN can place and remove matrix bands

Direct supervision

Overhang

Excess restorative material that extends beyond the cavity margin

Spindle pin

Fits into the diagonal slot to hold the ends of the matrix band

Cupping

Form created by a concave tooth surface that has not been contoured properly

Matrix

Foundation that binds or holds the dental material and tooth together during the setting process

Automatrix

Matrix system designed to establish a temporary interproximal wall for the restoration of a tooth surface without the use of a retainer

Universal band

Selected for the class II preparation when the proximal "box" is prepared to a minimum depth and width and the cusps are intact.

Extension band

Selected for the deeper class II preparation requiring gingival extensions to compensate for the loss of a cusp, because insufficient height of a universal band will not exceed the height of the occlusal surface of the tooth as required.

T-band

Type of matrix band used for primary teeth

Inner knob

Used to increase or decrease the size of the matrix band loop (D)

Outer knob

Used to tighten or loosen the spindle within the diagonal slot (C)

Wedge

Wooden or plastic triangular device placed in the embrasure to provide the contour needed when a class II lesion is restored.