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Dental matrices indications, quality, types

Dental matrices indications, quality, types. Abdulaziz Al- Abdulwahed , BDS. Definition. Something within or from which something else originates, develops, or takes form. Mold. Die. A material in which something is enclosed or embedded (as for protection or study).

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Dental matrices indications, quality, types

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  1. Dental matricesindications, quality, types Abdulaziz Al-Abdulwahed, BDS

  2. Definition • Something within or from which something else originates, develops, or takes form. • Mold. • Die. • A material in which something is enclosed or embedded (as for protection or study). • Merriam-Webster dictionary • Your dictionary . com

  3. The purpose • Confine the amalgam so that adequate condensation forces can be applied. • Allow reestablishment of contact with the adjacent tooth. • Resist extrusion of the amalgam and the formation of an overhang. • Provide for adequate contour of the proximal surface of the restoration. • Establish an acceptable surface texture to the proximal surfaces, especially to the area that cannot be carved and burnished.

  4. Qualities of a good matrix • Rigidity. • Establishment of proper anatomic contour. • Restoration of correct proximal relation. • Prevention of gingival access (marginal overhang). • Convenient application . • Ease of removal.

  5. Types of Matrices • Universal Matrix (Tofflemire): • Indicated ideally for MOD, or lingual surface preparation. • Can be placed in a facial or lingual in relation to the tooth. • The Tofflemire retainer consists of different parts: • Head. • Slide. • Rotating spindle. • Set-screw. • Used with most restoration materials.

  6. Types of Matrices • Precontoured bands. • PrecontouredTofflemire band. • Palodent. • Limited application, due to very rounded contour. • More suitable in distal of max. canines, and man. 1st premolars. • The contact area of the adjacent tooth is occasionally too close to allow placement of the band without making a dent on the contact area making it unusable.

  7. Types of Matrices • Automatrix. • 4 different bands: Narrow regular, Wide regular, Medium regular, Medium thin. • Indicated to be used with extensive CL II, involving two or more cusps. • Auto-lock loop can be positioned either facially or lingualy. • Difficult to establish a proper anatomic contour, since it wasn’t precontoured in the beginning.

  8. Other types • Omni-matrix: preassembled Tofflemire, intended for a one time use then disposal. • Matrix strips: • Dead soft, metal. • Plastic strip. (CL lll, CL IV). • Most matrices either comes in metal (steel), clear (plastic). • Copper band matrix: used in complex amalgam restorations, rigid, recontourable, festooned.

  9. Wedging • Wedging is an integral, and a crucial part of the placement of the matrix. • Used to stabilize the matrix in place, and to prevent the excess of amalgam (marginal overhang). • Fundamental to retract the rubber dam in a gingival direction. • Wedges can be: • Wooden. • Clear (plastic). • Wizard wedge, triangular cross-section. • Rounded wedges. • Premier Sycamore wedges.

  10. Required Reading • Sturdevant’s Art & Science Of Operative Dentistry, 4th ed. Pages:718-730; 694-695; 790-795; 515-516; 526-527 • Fundamentals Of Operative Dentistry, A Contemporary Approach, Richard S. Schwartz, 2nd ed. Pages: 337-344; 284-285; 251-252

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