Operative Dentistry: Matrices and Restorations

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Questions and Answers

What is the indication for using a T-shaped Matrix Band?

Patients that can’t tolerate the matrix retainer or Class II cavities (correct)

Class 3 or class 2 with Class V extension

Class I cavities with buccal or lingual extension

Rapid tooth separation

What is the purpose of a wedge in tooth restoration?

To hold the matrix band in position

To provide space to compensate for thickness of matrix band

To prevent gingival overhang of restoration

All of the above (correct)

What type of matrix is used for Class 1 cavities with buccal or lingual extension?

Double banded Tofflemire matrix (correct)

The wedged metal matrix

T-shaped Matrix Band

S-shaped Matrix Band

What is the disadvantage of a T-shaped Matrix Band?

Flimsy in structure, not stable Signup and view all the answers

What is the function of a ligature in a ligature tied band?

To tie the band to the tooth Signup and view all the answers

What is the purpose of a compound material in an S-shaped Matrix Band?

To hold the band in position Signup and view all the answers

What is the function of a wedge in providing space for the matrix band?

To provide space to compensate for thickness of matrix band Signup and view all the answers

What type of matrix is the Soldered Metal Band?

A type of wedged metal matrix Signup and view all the answers

What is the primary function of wedges in operative dentistry?

To help in minimizing trauma to soft tissue Signup and view all the answers

What type of wood is preferred for making wooden wedges?

Both soft and hard wood Signup and view all the answers

What is the advantage of triangular wooden wedges over round wooden wedges?

They are more effective in stabilizing gingiva Signup and view all the answers

In which type of tooth preparation are round wooden wedges used?

Class II tooth preparation Signup and view all the answers

What is the disadvantage of using plastic wedges?

All of the above Signup and view all the answers

What is the unique feature of the Diamond Wedge?

It has a diamond shaped cut-out in the tip Signup and view all the answers

What is the advantage of using the Diamond Wedge over traditional wedges?

It creates a tight seal and prevents backing out Signup and view all the answers

What is the difference between the Original Diamond Wedge and the Long Diamond Wedge?

The Long Diamond Wedge is approximately 2mm longer than the original wedge Signup and view all the answers

Study Notes

Matrices

Custom-made matrices include T-shaped Matrix Band, S-shaped Matrix Band, and others
T-shaped Matrix Band is indicated for patients who can't tolerate the matrix retainer and for Class II cavities in children
Advantages of T-shaped Matrix Band include simplicity and being inexpensive and rapid
Disadvantages of T-shaped Matrix Band include being flimsy in structure and not stable

S-shaped Matrix Band

Indicated for Class 3 or Class 2 with Class V extension
Compound material is used to hold the band in position in the facial, lingual, and gingival aspects

Types of Matrices for Compound Class I Restoration

Occlusolingual preparation
Class 1 with buccal or lingual extension
Double banded Tofflemire matrix is used

The Wedged Metal Matrix

Sectional matrix + wedge without the retainer
Compound or gingival barrier can be used

The Soldered Metal Band

A type of matrix band

Ligature Tied Band

Also known as the Black's metal band matrices
A piece of metal band is cut shorter and slightly less than the measurement of the neck of the tooth
Gingival corners are turned up or a hole is punched near each end
Dental floss silk is passed through one hole, along the length of the band, and back through the other hole

Wedges

Devices used in rapid tooth separation, tooth preparation, and restoration
Functions of wedges include:
- Rapid separation of teeth
- Preventing gingival overhang of restoration
- Providing space to compensate for the thickness of the matrix band
- Helping in stabilization of the retainer and matrix during restorative procedures
- Providing close adaptability in the cervical portions of the proximal restorations
- Helping in retracting and depressing the interproximal gingival area
- Helping in depressing the rubber dam

Types of Wedges

Plastic wedges
Wooden wedges:
- Triangular
- Round

Wooden Wedges

Made from soft wood like pine or hard wood like oak
May be medicated
Preferred due to:
- Easy to trim
- Adapt well
- Absorb moisture and swell to provide adequate stabilization to the matrix band
- Used along with metal matrices

Triangular Wooden Wedges

Most commonly used
Apex of the wedge lies in the gingival portion of the contact area
Base lies in contact with the gingiva, helping in stabilization and retraction of the gingiva
Used in tooth preparations with deep gingival margins

Round Wooden Wedges

Not so commonly used
Made from wooden tooth picks by trimming the apical portion
Has a uniform shape
Used in Class II tooth preparation

Plastic Wedges

Have the disadvantage of being difficult to trim and adapt
Diamond Wedge is a type of plastic wedge that solves many of the difficulties in using traditional, rigid wedges
Diamond Wedge has a diamond-shaped cut-out in the tip, which collapses during insertion and springs open once through the embrasure, creating a tight seal and preventing the wedge from backing out
Flexibility of the Diamond Wedge creates an excellent marginal adaptation, which eliminates the uncontrolled flow of excess composite and minimizes clean-up after the composite has been cured

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Description

Explore the different types of matrices used in operative dentistry, including custom-made matrices, and their indications, advantages, and disadvantages. Learn about T-shaped Matrix Band, S-shaped Matrix Band, and more.