Matrices, retainers and wedges | PPT - SlideShare
Jan 8, 2021 · Advantages: • Tooth separation obtained from prewedging promotes more conservative preparation and help protect adjacent teeth from damage during preparation • Provide space for compensate thickness of matrix band • Help in stabilization of retainer and matrix during restorative procedures • Help in retracting and depressing ...
Ivory matrix band retainer introduced in 1905 is used to hold the matrix band to provide missing part of the walls on both proximal sides (MOD cavity) and class II compound cavities having missing walls on more than two surfaces on posterior teeth (MOB, MOL, DOB, DOL, MODL, MODB, and MODBL). This
Anterior Matrix Systems for Composite Restorations: A Review
Clear Teflon and cellulose acetate strips are examples of typical interproximal matrices. These strips are useful because the resin can be photoactivated through the transparent matrix. When stretched, polytetrafluoroethylene (PTFE) tape can act as a thin interdental barrier and create a restorative contact area that is reasonably accurate.
Matrices | PPT - SlideShare
Jun 8, 2021 · Various matrix types exist for different cavity classes, including Tofflemire matrices for Class II cavities, shaped strips for Class III/IV, and window matrices for Class V. Matrices are made of materials like metal, cellophane or mylar and aim to confine.
"Cracking the Viva: Important Questions & Answers for Conservative …
Jun 17, 2023 · Tofflemire retainer: Called universal retainer, used for restoring single and both proximal surfaces. It is the most ideal retainer for a Class II restoration. Q7. What are the matrices used for restoring a Class V tooth preparation? Ans. Window matrix, tin foil matrix, preformed transparent matrix, and Mylar strip. Q8.
Matrices, retainers, wedges and separators | PPT - SlideShare
Jan 25, 2020 · 1. Plastic matrix strip: • Transparent matrix strips • Celluloid (cellulose nitrate) strip are used for silicate cement • Cellophane ( cellulose acetate) strips are used for resins. 2. Mylar strip: • Matrix strip is burnished over the end of a steel instrument, to produce a ‘belly’ in the strip.
9: MATRIX BANDS AND MATRIX RETAINERS - Pocket Dentistry
Jan 8, 2015 · MATRIX BANDS AND MATRIX RETAINERS. When a restoration involves an interproximal surface, it is not possible to achieve a properly adapted restoration without a matrix band. A matrix band creates a temporary interproximal surface, and, when appropriate, a matrix retainer secures the matrix band in place.
Principles of Tooth Preparation - Pocket Dentistry
Feb 12, 2015 · Commonly used materials for bands are: 1. Stainless steel. 2. Polyacetate. 3. Cellulose acetate. 4. Cellulose nitrate. Matrix band should extend 2 mm above the marginal ridge height and 1 mm below gingival margin of the preparation.
14: Materials used in temporization - Pocket Dentistry
Jan 31, 2015 · Cellulose acetate crown forms. These crown forms are transparent (Figure 14.3). They are used in essentially the same manner as polycarbonate crowns: they are trimmed to size using crown shears or scissors and then packed with another material matching in shade to the surrounding teeth. Some clinicians use resin-based composite for this purpose.
Matrix and Wedge Systems - SpringerLink
Dec 15, 2019 · As examples, there are the cellulose acetate or PVC transparent plastic crowns forms (or transparent strip crowns), as seen in Fig. 8.13a, b. They are used as a shell matrix for the restoration or teeth reshaping, simplifying the sculpture process.