What is a tofflemire matrix holder and band?

Matrix Band Placement

The Universal (Tofflemire) matrix system is used in Class II restorations. The primary function of the matrix is to restore anatomic proximal contours and contact areas. A properly placed matrix should: Be rigid against the existing tooth structure. Establish proper anatomic contour.

What holds a matrix band in place?

Universal retainer

Also referred to as the Tofflemire retainer. This device holds the matrix band in position. The retainer is positioned most commonly from the buccal surface of the tooth being restored.

What is the function of the bottom knob on the tofflemire matrix retainer?

There are two knobs on the tofflemire. The long knob changes the diameter of the loop and the short knob locks the band in place. Once the band is in place, and facing the correct direction, turn the short knob to lock it into place.

Which bands are best used for primary teeth?

001 inch brass matrices. These bands can provide quick and easy matrices, and I use them for children and teenagers. I prefer the straight (vs. curved) narrow T-bands for primary teeth.

What is a siqveland matrix band used for?

The Siqveland retainer is self-adjusting to provide a narrower circumference at the gingival area of a cavity preparation and can be used for preparations with more than one missing proximal wall. It is available in two sizes to take either narrow or broad bands.

Why would a dentist place a liner?

Dental cavity liners have historically been used to protect the pulp from the toxic effects of some dental restorative materials and to prevent the pain of thermal conductivity by placing an insulating layer between restorative material and the remaining tooth structure.

What is the purpose of a wedge in dentistry?

Matrix bands and wedges are commonly used to prevent overhanging margins at the proximal area. The applied wedge seals the matrix/cavity interface, creates minor tooth separation to compensate for the thickness of the matrix band, and affects the proximal contour.

Which component of the universal retainer is used to position the ends of the matrix band into the vise?

What are the components of a universal retainer? Internal screwlike pin that fits into the diagonal slot to hold the ends of the matrix band. When the retainer is assembled, the spindle point must be clear of the slot while the band is slid into the slot, and then tightened.

What is the thickness of matrix band?

Matrices range in width from 6.35 mm (1/4″) to 9.525 mm (3/8″) for permanent teeth and 3.175 mm (1/8″) to 7.9375 mm (5/16″) for deciduous teeth. Their thickness may range between 0.0381 mm (0.0015″) to 0.0508 mm (0.002″). 4.