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.