Choosing a sectional matrix system is less about finding one “best” band and more about matching the matrix, wedge and separation method to the cavity you are restoring. A shallow Class II with an intact marginal ridge on the adjacent tooth needs something very different from a wide proximal box, a missing cusp, or a distal lesion on the last tooth in the arch.
This guide explains the main sectional matrix options we use, what changes clinically between them, and where systems such as Tor VM Classic Sectional Matrices, Double Curve Sectional Matrices, Saddle Matrices, MD-Ring and conventional retainers fit into the workflow.
What does a sectional matrix system need to achieve?
In a posterior composite restoration, the matrix system has several jobs at once. It needs to contain the restorative material, reproduce a natural proximal contour, allow a tight contact to be created, seal the cervical margin as well as possible, and remain stable while the composite is placed.
The practical challenge is that these requirements can conflict. A very thin matrix may need less tooth separation, but it may deform more easily. A stiffer band may resist distortion but need stronger separation. A highly curved matrix can improve contour in a wide box but may be excessive for a small, conservative preparation.
That is why having more than one matrix pattern available is useful.
1. Classic sectional matrices: the everyday option
Classic sectional matrix bands are the logical starting point for routine Class II posterior composites. They are pre-contoured and are designed to be used with a separation ring and wedge.
We stock hardened steel versions in both 35 and 50 micron thicknesses.
- 35 micron: thinner, so less separation is required to compensate for the thickness of the band.
- 50 micron: stiffer and more resistant to deformation, which can be useful when using a strong ring or when the preparation makes band stability more difficult.
For an uncomplicated proximal box with a neighbouring tooth present, a classic sectional matrix is usually the first system we would reach for.
2. Double Curve matrices: useful when the proximal space is wider
A standard sectional band can sometimes flatten across a large proximal defect. This is where a more pronounced contour can help.
Tor VM Double Curve Sectional Matrix Bands have a greater curvature through the working part of the matrix than a conventional sectional band. This allows the matrix to span a larger proximal gap while still creating a fuller proximal contour.
They are particularly useful when:
- the proximal box is wide;
- a cusp or substantial amount of marginal ridge has been lost;
- a conventional matrix needs excessive burnishing to obtain the desired contour;
- you want more emergence profile built into the matrix from the outset.
Double Curve bands are not automatically better for every Class II. For smaller preparations, a traditional sectional band may be easier to control. Think of Double Curve as an additional shape for the more demanding proximal box rather than a replacement for a standard band.
3. Saddle matrices: for difficult access and missing adjacent teeth
Saddle matrices are one of the most useful alternatives when a normal sectional matrix and ring are awkward to stabilise.
The saddle shape can be retained with a small spring clip, which makes it particularly useful when there is no adjacent tooth available to help support a conventional matrix setup, for example on a distal lesion affecting the last tooth in the arch.
We also use saddle bands in a second way: the arms can be removed and the contoured portion used as an alternative sectional band. Their pronounced curvature can be helpful when you want a fuller proximal shape than a standard band provides.
This makes saddle matrices worth having available even if you do not use the spring-clip technique routinely.
4. The separation ring matters as much as the matrix
A sectional matrix cannot create a predictable contact point by itself. The thickness of the band occupies space, so the teeth must be separated enough to compensate for the band before the restoration is finished.
A ring such as the Tor VM MD-Ring is designed to sit over a separating wedge and provide tooth separation while helping stabilise the matrix.
The stronger the separator, the more important band stiffness can become. This is one reason some clinicians prefer a 50 micron matrix with powerful ring systems: the thicker band is more resistant to buckling or distortion during placement.
With a thinner 35 micron band, less separation is required, which can make the setup more forgiving in routine cases.
5. Wedge selection: seal first, separation second
The wedge should stabilise the cervical portion of the matrix and help obtain a good seal at the gingival margin. Its job is not simply to be “as large as possible”.
A wedge that is too small may leave a cervical gap. A wedge that is excessively large can distort the matrix or displace it coronally.
For light-cured restorative procedures, transparent plastic wedges can be useful where additional light transmission is desirable. Conventional wooden wedges remain valuable because they compress and adapt well to irregular embrasures.
For substantially deeper margins, a dedicated solution such as Deep Margin Elevation (DME) Wedges may be more appropriate than trying to force a conventional wedge into a subgingival situation.
6. When would we use a circumferential retainer instead?
Sectional matrices are excellent when the aim is to recreate a proximal contact and natural contour, but they are not the answer to every restoration.
A circumferential band and retainer may be preferable for:
- large build-ups where several walls are missing;
- deep margin elevation where you need a stable band extending around more of the tooth;
- Class V or unusual cervical restorations;
- situations where a separation ring cannot be seated predictably.
Our Premium Contra-Angle Tofflemire Retainer is designed to improve posterior access compared with a conventional straight retainer. The Nyström Universal Matrix Retainer is another option we particularly like for DME and deeper cervical work because the straight design is easy to load and holds the band securely.
A simple way to choose the system
As a practical starting point:
- Routine Class II: Classic sectional matrix + wedge + separation ring.
- Wide proximal box or lost cusp: consider a Double Curve matrix.
- Last tooth in the arch or no adjacent tooth: consider a Saddle matrix with spring clip.
- Very deep cervical margin: consider DME-specific wedges and/or a circumferential matrix.
- Large multi-surface build-up: a Tofflemire-style or Nyström retainer may offer better stability.
No single matrix pattern covers every posterior restoration. In practice, the most predictable approach is to keep a small range of matrix shapes and choose the one that already approximates the contour you want, rather than trying to force one system to work in every situation.
Shop matrix systems and accessories
You can compare our full range of dental matrix bands and retainers, including Tor VM sectional matrices, Saddle matrices, Double Curve bands, Tofflemire-style systems and associated rings and wedges.
If you are unsure which matrix is suitable for a particular clinical situation, contact us and we can help you compare the available options.