There are different methods for the placement of Phocal fluoride disks.
The choice of placement method and Phocal type is subject to the discretion of the dental professional and is usually dependent upon the nature of the site being treated, interproximal tightness and the strength and type of adjacent restorations and teeth.
Prior to treatment using either of the placement methods below, all debris and calculus should be removed from the selected site(s) and the site(s) should remain dry during placement. Premature wetting softens the disks and can compromise correct interproximal placement.
Method 1 – Insertion of flat Phocal disks
Recommended for anterior teeth and where spacing allows.
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When spacing allows, insert the flat
Phocal disk interproximally with forceps and/or by hand directly between the contact points of the two adjacent teeth.
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In some cases, separation with wedges may be necessary prior to insertion.
Method 2 – Insertion of folded Phocal disks
Recommended for posterior teeth and where spacing is restrictive.
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Where spacing is restricted, or where the apical regions such as tooth restoration margins must be reached, the disk can be folded into a V shape and easily inserted below the contact point.
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To fold the
Phocal disk, lightly dampen the tips of a pair of thin forceps and shake off excess water, while keeping your hands completely dry. Use the tip of the thin forceps to moisten only the midline of the disk by moving the forceps tip back and forth along the midline. Be sure that midline is damp enough so the disk can fold without snapping.
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Then hold the disk at the midline with the thin forceps and gently fold the disk into a V shape with dry fingers. If you feel that the disk could snap, stop folding and repeat the midline moistening step.
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Insert the folded
Phocal disk by hand and/or with forceps interproximally, with the apex at or below the contact area but over the gingival papillae and with each folded flap in contact with the wall of the adjacent teeth.
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The folded
Phocal disk apex can be pushed further into the contact area. To accomplish this, insert a thin probe under the fold of the disk to apply coronal pressure alone, or simultaneously with an apical wedge force from the interproximal occlusal surface.
In rare cases nickel titanium springs, elastic O-rings or Maxian strips can be used to separate teeth but this is usually a slower process which requires two visits: one for separation and then one for disk placement.
To accelerate the initial reactions of Phocal disks a curing light can be applied for 3-10 seconds.
To extend the fluoride release time period, a varnish can be applied to partially cover the interproximal site or disk occlusally, buccally or/and lingually. However the disk should not be completely coated with varnish.
To shorten the release time the disks can be removed using an appropriate instrument, dental floss and/or aspiration.
If Phocal Apf is used, in order to guard against possible etching of porcelain crowns or tooth-colored restorations, a protective matrix should be used. With Phocal pHn there is no risk of etching.
Advise the patient not to eat, drink or rinse for at least 30 minutes after treatment.
If multiple applications are necessary, treat no more than 8 sites at a time and delay subsequent Phocal applications for at least a day.
If deemed necessary, patients may be recalled at intervals of 2 to 12 months for repeated treatments.
Phocal disks are versatile, and with specific gentle moisturization they can be trimmed, rolled, or folded to fit other inaccessible areas such as furcations.