MatricingMatricing

Classification of matrix bands:

1. Depends upon their method of retention: a. Mechanically retained with a retainer:

i. Ivory matrix retainer no.1

ii. Ivory matrix retainer no.8 iii. Tofflemire universal dental matrix band retainer

iv. Steele's Siqveland self adjusting matrix retainer v. Nystrom's matrix band retainer

b. Self retained matrix bands: (copper or stainless steel band)

i. Anatomical matrix band ii. Auto matrix band iii. T-shaped matrix band iv. S-shaped matrix band v. full circle or ring bands vi. Blacks matrix bands vii. L-shaped matrix band viii. Transparent crown form matrix band

Ivory no. 1 retainer and contoured matrix bands

Ivory matrix band retainer no. 8 and contoured circumferential matrix band

Ivory matrix band retainer no. 8 and contoured circumferential matrix band

Steele's Siqveland band retainer Steele's Siqveland band retainer suitable for tapering teethsuitable for tapering teeth

Steele's Siqveland Steele's Siqveland band retainer band retainer suitable for suitable for tapening teethtapening teeth

Steele's Siqveland band retainerSteele's Siqveland band retainer

Nystrom's retainers with oblique or straight slots

Nystrom's retainer placed buccally or lingually in the lower jaw

(A) Band ends tightening nut(B) band tightening nut(C) Diagonal slot to hold ends of matrix band

Straight Tofflemire universal retainer and contoured circumferential matrix band is place on MODBL cavity of mandibular first molar with wedges on proximal sides

Contra-angled Tofflemire universal retainer positional on lingual surface of tooth.

Removal of the matrix band in linguo-occlusal direction (arrows) with the help of four fingers, two of each hand on ether side to avoid fracture of freshly filled amalgam filling.

Antomical matrix buccally Antomical matrix buccally and lingually placed self-cure and lingually placed self-cure acrylic or softened acrylic or softened impression compound impression compound supports are held with thumb supports are held with thumb and forefinger during and forefinger during hardening.hardening.To hold buccal and lingual To hold buccal and lingual pieces of impression pieces of impression compound in place, a heated compound in place, a heated staple is inserted in both of staple is inserted in both of them from occlusal sidethem from occlusal side

RetainerlessRetainerless automatrix bandautomatrix band

Automatrix bands kit with ratchet for tightening and cutter for removing the band

USE OF T-BANDUSE OF T-BAND

(A) T-band. (B) Folding one arm of T (C) Folding another arm of T making a loop.(D) Folding of longer arm making a band. (E) Longer arm of T making a loop formed by smaller arms making a band.(F) Buccal view of T-band around the molar teeth after tying the thread.(G)Bucco-occlusal view of band molar.

Use of 'S' shaped matrix Use of 'S' shaped matrix for class II preparationfor class II preparation (A) Matrix and wedge in poistion. (B) Reinforcement with impression compound.

Celluloid strip matrix-Dotted lined strip is kept on labial side & continous lined strip is kept on lingual side to hold the restoration material firmly in place.

(A) The matrix is is folded at 90º forming (B) The L shaped matrix (C) Matrix is folded to form the proper angle and adapted lingually(D) After holding matrix firmly and tightly on labial side the cavity is filed with the restoration is material and the matrix strip is folded on lingual side and angle of restoration is well coutoured. The celluloid strip is removed after the restoration material has become hard

Readymade Readymade transparent crown transparent crown from matrix for from matrix for repair of fracture repair of fracture of mesioincisal of mesioincisal angle of central angle of central incisoincisor

Fabrication of anatomic custom made matrix for individual specific requirement where multiple surface or teeth are to be restored

A. In conservative class II preparation where gingival step in much step in much above the gingival 'col' , the triangle wedge is unable to support the matrix band against th gingival step thereby reproducing overhanging marigin.

B. In conservative class II preparation where gingival step is much the ginival 'col' , the round wedge will properly support matrix band againstthe gingival step (because its weding ation is nearer the gingival step) thereby producing proper margins.

VARIOUS SHAPES OF WEDGES, THEIR PLACEMENT AND EFFECT OF CORRECT AND INCORRECT WEDGES

C. In class II preparation with deep gingival step the thick around wedge, whose major portion is above the gingival step will crimp the matrix band.

D. In class II preparation with deep gingival step the acute apex triangl wedge (as shown in Figure) will reproduce proper margins.

VARIOUS SHAPES OF WEDGES, THEIR PLACEMENT AND VARIOUS SHAPES OF WEDGES, THEIR PLACEMENT AND EFFECT OF CORRECT AND INCORRECT WEDGESEFFECT OF CORRECT AND INCORRECT WEDGES

Palodent Bi Tine spring Palodent Bi Tine spring ring providing ring providing separation and holding separation and holding sectional matrix in place sectional matrix in place on the mesial side of the on the mesial side of the first molar.first molar.

A. Continuous ring end is towards distal side.B. Impression compound adaptation of the matrix. Contnuous ring end is toward mesial side. Winged rubber dam clamp is seen on the second molar with arm on the distal side.

Retainerlesss Retainerlesss Walser filling Walser filling matrix (A) for MO matrix (A) for MO and/ or Do cavity and/ or Do cavity (B) for MOD cavity(B) for MOD cavity

Retainerlesss Walser Retainerlesss Walser filling matrix (A) for filling matrix (A) for MO and/ or Do MO and/ or Do cavity (B) for MOD cavity (B) for MOD cavitycavity