Tips & Tricks

The ideal case for an OVC is any case where the OVC3 Matrix Band can be retained in stable position. Sometimes additional matrix stabilization can be achieved by elevating the margins using the OVC Wedges that are in the kit. If you have a plunging opposing cusp, you will need to recontour it first. Any structurally compromised posterior teeth, in need of full occlusal coverage, are good cases for the OVC.

For visual examples please see our case selection guide.

It is more accurate to measure the mesial-distal distance once the tooth is reduced and the contacts are removed. Another option is to take a bite registration impression at initial consult and use a Selector Key to measure the impression.

Prepare the tooth with a round diamond bur of at least 1.2 mm diameter, followed by yellow strip tapered round-end diamond bur to remove sharp edges and polish the prep. Bevel the margins for better bonding, shade blending and easier matrix application.

It is important to check the occlusal clearance obtained before starting the OVC customization. Allow at least 1 mm of clearance in the central fossa and 1.5 mm at the cusps and marginal ridges. OVC Replicas are supplied to confirm the minimum required clearance is achieved.

The Replica can be covered on both sides with a coloured occlusal indicator spray such as Bausch Arti-Spray® to aid high spot identification. Place the sprayed Replica over the dried prep and get the patient to gently bite. This will leave a coloured mark on the high spots that need further trimming.

The aesthetic appeal of OVC can be enhanced by staining with coloured resins following manufacturer’s instructions.

Before polishing and finishing, please remember to fully cure the OVC from all sides. Use your preferred burs, disks and polishers and then, if desired, a goat hair soft brush with polishing paste such as Cosmedent Enamelize for high shine.

Small localized dark areas on the prep, such as an amalgam tattoo or dark dentine spots, can shine through the restoration due to the high translucency of the material. To prevent this from happening, it is advisable to bond a white opaque flowable liner over the dark areas before the OVC adaptation.

Fresh composite adaptation and excess removal can be done more easily with a sharp carving instrument.

It is particularly worth spending a few extra moment to carve the proximal marginal ridges before curing and these are difficult to get right after the composite has cured.

Check for occlusal contacts in both central occlusion and lateral excursions. It is important to check for lateral excursion contacts and remove them to preserve the integrity of the restoration and for patient comfort.

Frequently Asked Questions

Product FAQ’s

Many of our customers complete the OVC in around 30 to 50 minutes, including prep.

The procedure is easier than a MODBL composite restorative.  Please view our online videos that show the technique.

If you’d like to arrange a one-on-one training session please contact us.

Yes. We offer one-on-one online training sessions. Depending on your location, we also host regular CE events. For dental offices or groups of multiple dentists, a lunch and learn event or similar may be possible – contact us to discuss.

When you are doing your first case it is a good idea to explain the usual traditional crown options and also explain that you like to keep up with the latest technology and have come across a new technique (the OVC3) that can be done in one visit.  Then explain that you have not done one before but the technique is very similar to doing a large composite filling and you would like to try it out.  Then ask if the patient would mind if you did your first case for them. Maybe you can offer a special discount.  By doing this you are being totally honest with your patient and if you do run into any problems you can always switch to taking an impression and making a temporary crown, without “losing face”.  For your first case it is a good idea to allocate one hour for the appointment and make it before lunch or at the end of the day.

Many OVC3 dentists simply include the OVC3 option as part of their everyday crown explanation cover the pros and cons of each solution and their associated costs.

The OVC3 is a quality alternative to an expensive CAD/CAM or lab made crown or a large composite filling. The OVC3 is more efficient and therefore allows you either significantly increase your hourly productivity or allows you to be generous with your financially challenged patients.  In the USA, many dentists do the OVC3 under dental insurance or offer the treatment privately at any price they choose.

The OVC3 also makes an emergency, same day crown a possibility without a CAD/CAM.

The OVC3 comes in 5 sizes for each posterior tooth type (upper and lower premolars and molars).

Each OVC3 Case contains everything you need for a single procedure.

Technical FAQs

Both layers of the OVC3 are made of 73% zirconia filled hybrid ceramic. The occlusal layer is fully heat cured with the occlusal anatomy pre-formed. The under layer is uncured, allowing you to customize it to any preparation.  OVC3 hybrid ceramic has a flexural strength of 146MPa.

The OVC3 system uses a two-stage process to get tight contacts.

  1. After placing the OVC3 Matrix Band, floss through the Stretch-Wedges but only pull sufficiently to seal the matrix band against the bottom of the proximal box. Burnish the contact areas. Then place either a small amount of composite or flowable resin around the margin of the proximal box and then hold the matrix band tightly against the neighboring contact point with a hand-instrument like a ball-burnisher and cure.  Ensure that the composite or flowable is below the contact point.  If you cover the contact point with composite you won’t be able to complete stage 2 below.
    This process closes the “proximal triangle” as shown below.
  2. You can now pull very firmly on the Stretch-Wedges, pulling the wedge further into the interproximal space. This separates the teeth just like a separating ring.  You now must re-burnish the contact areas to make allowance for the gap that you just created by pulling hard on the Stretch-Wedges.

With this method, you can reliably get tight contacts when the OVC is placed.

In most cases, deep cavity defects are cured in layers using standard procedures before the OVC is placed. Contraction issues are small since the C-factor is only 1.  These are even further reduced by spot-curing the centre of the OVC first. By spot-curing the centre, any shrinkage can draw additional material from the surrounding uncured composite, while pulling the crown towards the tooth. This reduces internal stresses. The final cure should only be curing the periphery of the OVC and not the centre.

Spot-curing the core of the uncured composite stabilizes the crown in the vertical dimension, allowing you to trim the uncured composite from the peripheral surfaces easier. This reduces the finishing time.

You only need to cure long enough to stabilize the OVC3 and the time will depend on the power of your curing light. Too much curing will make it hard to trim the periphery of the OVC3.

It’s a very simple process – follow these easy steps:

  1. Remove excess composite with diamond or carbide burs of medium grit.
  2. Use fine grit to smooth off the surface.
  3. Use appropriate polishing discs.
  4. Use a soft brush with polishing paste.

If you like, you can use isolation devices such as a rubber dam or an Isolite System for some parts of the procedure. However, you will need to remove the isolation device at times. For example, when checking the occlusal clearance with the OVC Replica and when checking the vertical position of the OVC by getting the patient to GENTLY bite on it. Alternatively, you can use OptraGate from Ivoclar to improve access and help with isolation.

In most cases, the OVC will cater for preparations with a maximum of 3mm occlusal clearance. If deep areas are present (more than 3mm when referencing the adjacent tooth), it is better to build up the prep.

Yes. Use a separating agent and apply to the tooth surface. Place the OVC3, partially cure, then remove it from the tooth and finish outside the mouth. Bond using standard composite bonding techniques.

Absolutely. In some cases, it may be possible to surround the tooth with the OVC Matrix Band. From here you can do a normal build up in the subgingival area, sufficient to be able to apply the OVC directly. Use traditional build-up techniques to stabilise the prep as you would with a regular crown.

If needed, the occlusal contacts are easily adjusted with a fine grit diamond bur with generous water spray.   You may need to adjust the opposing tooth if it has a plunging cusp.  The trimmed areas can be further polished with yellow band diamond polishing burs, followed by your preferred ceramic polishing system.

Not necessarily. If the interfaces are left untidy and not polished properly when the OVC is placed, there is a possibility of staining in the future. If this does happen, the crown can be easily polished at a recall visit.