> TDB Retainer Bridges - Type CBW
click here > General 1
click here > Specifying the retainer position on the model
click here > Marking the central drilling point
click here > Predrilling the enamel
Fitting and adhesive placement of the retainer
Use the special fitting device or a retainer without holder to fit the retainer in the prepared channel. The retainer has to be slightly recessed and completely level against the abutment tooth. If the fitting is not exact, the channel should be deepened carefully and the fitting procedure should be repeated. click here > Impression click here > Making a temporary provision
When you are sure of the exact fit the retainer can be cemented.
Apply rubberdam! Clean the abutment with sodiumhypochloride. Place the retainer in ethyl alcohol for some time.
IMPORTANT: Never remove a retainer from the retainer holder druring the process!
Remove discoloration of the abutment teeth with a brush or rubber.....
Etch the preparation for 30-40 sec with 37% phosphoric acid, rinse 30 sec. with water spray and dry carefully. Apply primer/bonding according to the instructions of the manufacturer.
Apply little cement on the retainer pin and in to the channel with a small brush.
Poistion the retainer holder in a 90 degree angle to the occlusal / incisal surface firmly into the channel. Beware of the proper positioning of the retainer holder!!
During the fixation process, the retainer holder should be kept in place under pressure using a Heidemann spatula.
When the cement has fully dried (takes about 6 min.), the retainer holder is removed from the retainer in occlusal/incisal direction.
Remove excess cement with a brush paying extra attention to the space between retainer and gingiva. Apply glycerine gel.
click here > Impression
click here > Making a temporary provision