12 Operative Dentistry: Matrix and Wedging

<p>1.5 - 2.0 mm (A)</p> Signup and view all the answers

<p>Class I compound with buccal or lingual extensions (D)</p> Signup and view all the answers

<p>Allows easy adjustment of circumference (B)</p> Signup and view all the answers

<p>Contra angled retainer (B)</p> Signup and view all the answers

<p>It is designed to release without disturbing the restoration (B)</p> Signup and view all the answers

<p>To define the proper contour and support the restoration (B)</p> Signup and view all the answers

<p>High absorption of moisture (D)</p> Signup and view all the answers

<p>Enhances the adaptation of the restoration through pressure (D)</p> Signup and view all the answers

<p>It prevents marginal overhangs of the restoration (C)</p> Signup and view all the answers

<p>Sectional matrix (A)</p> Signup and view all the answers

<p>Smooth surface for biocompatibility (D)</p> Signup and view all the answers

<p>A matrix that surrounds the entire preparation (D)</p> Signup and view all the answers

<p>Inability to restore missing dental surfaces (B)</p> Signup and view all the answers

<p>To prevent deformation during condensation (D)</p> Signup and view all the answers

<p>Conical (B)</p> Signup and view all the answers

<p>No. 1 band (C)</p> Signup and view all the answers

<p>Flat bands can be contoured before or after placement (B)</p> Signup and view all the answers

<p>0.0010 inches (A)</p> Signup and view all the answers

<p>To create a better fit for the restoration (C)</p> Signup and view all the answers

<p>No. 2 band (C)</p> Signup and view all the answers

<p>Rubber (C)</p> Signup and view all the answers

<p>To promote more conservative preparation and protect adjacent teeth (C)</p> Signup and view all the answers

<p>Wooden Anatomical Wedge (D)</p> Signup and view all the answers

<p>They have built-in light reflecting properties (B)</p> Signup and view all the answers

<p>Class V (D)</p> Signup and view all the answers

<p>Gingival to the gingival margin (C)</p> Signup and view all the answers

<p>O-shape (C)</p> Signup and view all the answers

<p>They swell when wet to improve separation (D)</p> Signup and view all the answers

<p>Anterior Matrix (D)</p> Signup and view all the answers

<p>It creates abnormal concavity in the proximal surface of the restoration. (D)</p> Signup and view all the answers

<p>Placing the wedge directly against the inflamed area. (B)</p> Signup and view all the answers

<p>Gingival overhangs in the restorations will occur. (A)</p> Signup and view all the answers

<p>To avoid any overhang of the restoration. (B)</p> Signup and view all the answers

<p>Presence of large cavity flutes near the gingival area. (A)</p> Signup and view all the answers

<p>It is a retainerless matrix system. (B)</p> Signup and view all the answers

<p>Bitine ring (D)</p> Signup and view all the answers

<p>It offers improved visibility due to the absence of a retainer. (D)</p> Signup and view all the answers

<p>It is difficult to develop proper proximal contours and contacts. (D)</p> Signup and view all the answers

<p>They create tighter anatomical contacts effectively. (C)</p> Signup and view all the answers

<p>By stabilizing the matrix band and providing tooth separation. (B)</p> Signup and view all the answers

<p>Sectional matrices (B)</p> Signup and view all the answers

<p>It is very thin and comes in various sizes. (B)</p> Signup and view all the answers

A contoured piece of material (metal or other) used to support and shape a dental restoration during placement and hardening.

A matrix maintains the tooth's shape, prevents overhangs, and increases restoration density and adaptation by applying pressure.

A good matrix should be easily adaptable, contourable, insertable, removable, rigid, thin, smooth, and polished to maintain proper contact and biocompatibility.

Matrices are necessary to control the placement and contour of dental restorations.

Establishes proper tooth contour and contact points.

Prevents marginal (edge) overhangs of the restoration, preventing damage of adjacent teeth.

Improves the density and adaptation of the restoration, leading to a more stable and durable restoration.

Creates a smooth surface, which is more biocompatible with surrounding gum tissue, which reduces risk of gum problems.

A common matrix system used in US dentistry, it consists of matrix bands and a retainer.

Bands used in the Tofflemire system available in 3 thicknesses (0.0010, 0.0015, 0.0020 inches).

Thicker bands are stiffer, resist deformation during restoration. Thinner bands provide a tight seal.

Flat bands need to be shaped before/after placement using a burnisher or other convex instruments.

The most common flat matrix band shape.

Matrix bands with extensions for deeper gingival margins, No.2 for molars, No.3 for premolars and small molars

Pre-shaped bands that don't need further shaping after placement.

Matrix systems are categorized by material (metal, plastic), thickness (thick, thin, ultra-thin), rigidity (rigid, flexible), circumference (circumferential, sectional).

A matrix retainer used to help contain restorative materials in dental procedures

Band's occlusal portion should extend 1.5-2.0 mm above adjacent tooth's marginal ridge.

Band's gingival portion should extend 0.5 mm below the gingival margin.

Straight or contra-angled, depending on cavity location (buccal/lingual).

A type of matrix retainer, commonly used for various dental procedures across all aspects of the mouth.

Open side(slot) should face gingivally during placement.

Used for buccal cavities or missing buccal walls when the retainer is placed lingually.

A disposable pre-assembled Tofflemire retainer and band for single-use restorations.

The matrix band should be snug against the tooth at the gum line to prevent overhangs during restoration.

A wedge is placed between the matrix band and tooth to ensure a tight fit and prevent overhangs. It's crucial to place it at the correct level for optimal results.

Placing the wedge too high causes an abnormal concavity on the tooth surface, compromising the shape of the restoration.

Placing the wedge too low allows the matrix band to loosen, leading to overhangs and potential gum irritation.

When rubber dam isn't used, careful wedge placement is essential as the gums are sensitive to bleeding.

A retainerless matrix band for any tooth shape, available in different widths.

Adjusts the loop of the Automatrix band to fit the tooth.

A matrix system without a retainer, offering better visibility.

Matrix bands in different sizes, designed for composite restorations.

Aids to stabilize sectional matrix bands and separate teeth for composite insertion.

Dental restorations using composite materials, often using sectional matrices.

Pre-formed T-shaped brass or stainless steel matrix band.

Enhanced view during dental procedures due to the absence of a retainer in some matrix systems.

Wedges are used in dentistry to support and stabilize the matrix band during restoration placement. They are commonly used in Class II restorations.

Wedges are typically made of wood or plastic. They can be triangular, anatomical, or light reflecting.

Anatomical wedges are recommended for deeper and wider preparations, as their maximum width is at the base to provide sufficient support.

Light reflecting wedges are plastic and transparent. They help to direct light into the proximal area during composite curing.

The wedge should be inserted from the side with the widest embrasure. Its base should be placed gingivally to the gingival margin.

A matrix is a temporary mold used to create the shape and contact point of a dental restoration.

Different matrix types exist, including clear polyester matrices, cervical clear matrices, and Walser matrices. They are used for different tooth classes and restorations.

Walser matrices come in different shapes, including X-shaped, O-shaped, ON-shaped, and XF-shaped, depending on the tooth location and restoration type.