Sectional Matrix Solutions Study Set | Medicine Terms & Definitions

Fill in the blank: Posterior composite restorations generally perform __________ compared to amalgam restorations.

Worse

T/F: Composite restorations are generally more technique-sensitive than amalgam restorations.

True

Why do posterior composite restorations tend to perform worse than amalgam restorations?

Due to technique sensitivity and polymerization shrinkage, which can affect contact point creation.

What technique is commonly taught for rebuilding the interproximal portion of a tooth in composite restorations?

The circumferential matrix band technique with a matrix holder and a wooden wedge.

T/F: Circumferential matrix bands provide better contact points in composite restorations than sectional matrices.

False

What are some disadvantages of circumferential matrix bands?

They can result in tooth displacement, inadequate anatomical emergence, and poor contact point formation.

Fill in the blank: Sectional matrices are designed to create a predictable __________ when placing posterior composite restorations.

Contact area

T/F: Sectional matrices are passively placed and are used in combination with separating rings to achieve tooth separation.

True

Why are sectional matrices considered superior to circumferential matrices?

They provide better anatomical contacts, reduce the risk of food impaction, and allow for easier flossing.

Fill in the blank: Sectional matrices help to form a contact area at the level of the __________ of the adjacent tooth.

Maximum convexity

T/F: Sectional matrices are less technique-sensitive than circumferential matrices.

False

What is one of the main challenges when using sectional matrices?

They are prone to distortion during placement, stabilization, and when placing restorative material.

Fill in the blank: Distortion in sectional matrices can result in a __________ at the contact area, which may not be clinically visible.

Concavity

What happens if a sectional matrix distorts during placement?

It can cause ledged restorations, incomplete seals, and concavities at the contact point.

T/F: Distorted matrices can be burnished to re-establish proper shape, but this may result in uneven topography.

True

What tool is commonly used to stabilize a sectional matrix cervically?

Wedges (either wooden or plastic)

T/F: Coronal stabilization is less critical than cervical stabilization when using sectional matrices.

False (both are important)

Fill in the blank: A sectional matrix can be stabilized coronally using a __________ or unbonded flowable composite.

Separating ring

What is a common method to achieve tooth separation when placing sectional matrices?

Using separating rings or wooden wedges.

T/F: The Teflon-floss technique can be used to improve cervical adaptation and seal in sectional matrices.

True

What is a common issue associated with using flexible sectional matrices during composite placement?

Extrusion distortion, where the composite material extrudes beyond the cavity, altering the matrix shape.

Fill in the blank: Extrusion distortion occurs when the matrix is insufficiently __________ during composite placement.

Stabilized

T/F: Overhangs at the coronal level of a restoration are less critical because they can be easily finished.

True

What can happen if the matrix is not properly adapted at the base of the cavity?

Ledges may form, which can lead to biofilm accumulation, secondary caries, or periodontal disease.

Why is tooth separation important when using sectional matrices?

It ensures that a contact area is formed between the restored and adjacent teeth once the matrix is removed.

T/F: Sectional matrices are better at recreating the anatomical emergence of the interproximal surface compared to circumferential matrices.

True

What patient-centered benefit does the use of sectional matrices provide?

They reduce food impaction, improve contact areas, and lead to better patient outcomes.

Fill in the blank: Sectional matrices minimize the risk of __________ at the contact area, which can harbor biofilm and lead to future caries.

Concavities

What is a key consideration when choosing the right matrix for a particular restoration?

The shape of the tooth, the size and depth of the cavity, and the proximity to adjacent teeth.

T/F: Proper cavity design and matrix selection can help prevent matrix distortion and improve restoration outcomes.

True