|COMPLETE DENTURE WAX-UP
Ideally, the palate of the baseplate is removed and replaced with two thicknesses of baseplate wax to provide for uniform thinness of the palate of the denture. For our lab denture, we will not remove the palate, but will add one thickness of wax over the TriadR baseplate. This is done because in working with students we have found that they tend to stretch the layers of baseplate wax as the place them and thereby make the palate too thin.
1. Remove Palatal Wax
Remove the maxillary mounted cast, with the baseplate and set teeth attached, from the articulator. Make a line in the wax of the palate with a sharp instrument that runs approximately 8 mm palatal to the teeth. Trim the wax palatal to this line down to the baseplate and then taper the wax from the teeth down to the line where the wax was removed.
2. Place the Wax in the Palate
Cut a piece of baseplate wax in half and heat it in a hot water bath or by carefully passing it through the flame of a Bunsen Burner until it is uniformly soft and pliable. Press this sheet of wax into place in the palate and use your thumb to cut it off at the linguo-occlusal line angle of the posterior teeth and the linguo-incisal line angle of the anterior teeth. Keep this layer as uniform in thickness as possible.
Seal and smooth the wax with a spatula and/or torch. Extend the sheet of baseplate wax beyond the posterior border of the posterior palatal seal. Flame and smooth palatal surface with Hanau torch.
3. Carve Palatal Surface
Use the knife end of a Roach carver to carve wax on the palatal side of the posterior teeth 20o below the horizontal palatal plane. The angle will be greater on the side of anterior teeth.
Remove ALL wax from the lingual of the teeth above the collar or finish line. Flame and smooth with a Hanau torch. Use sharp instrument to remove any remaining wax around the gingival margin of each tooth.
4. Contour Facial and Buccal
Flow a thin layer of wax onto the baseplate and around the necks of the teeth. Adapt a softened roll of wax along the facial surface of the baseplate. Be certain to have full extension of the borders.
Contour the wax to form fullness or convexity above the anterior teeth to simulate attached gingiva. Contour prominent canine root eminence that stops short of the border. Contour root eminence over maxillary central incisors (not as prominent as canines). Prepare a slight depression over maxillary lateral incisors.
Contour a "gingival bulge". A bulge is almost nonexistent above the 1st bicuspid. Starts over the 2nd bicuspid and widens as it travels to the distal of the 2nd molar. Place a slight depression in the premolar area. This is the canine fossa and is important if normal facial expression is to be obtained. Place a slight concavity along the buccal between the gingival bulge and the peripheral roll.
5. Carve Wax Around Buccal and Facial of Teeth
Seal the wax with a hot spatula around the necks of the teeth. Be sure to adequately seal the wax so that it will not separate, flake or chip when carved. Trim around the necks of the teeth with a Roach carver at the junction of the collar and crown.
Remove all remaining wax from teeth. Carve to produce a convex interdental papilla. Gently flame with Hanau torch to produce a smooth gingival margin. After flaming use a small sharp instrument to remove any wax around gingival margins of each tooth.
Flow wax on the lingual surfaces of the teeth and carve gingival margins to an angle of up to 20o below the horizontal on posteriors and 45o on anterior teeth.
Wax the posterior lingual flanges from the teeth to the peripheral roll making an inclined plane that slopes toward the tongue and is not convex. It should be slightly concave but not so much as to cause the tongue to dislodge the denture.
Contour and wax the distolingual area of the flange so that it blends into the retromylohyoid space. The peripheral roll should be rounded and completely fill the mucolingual sulcus of the cast. Flame and smooth the wax with a torch.
2. Labial and Buccal
Wax a small gingival bulge just below the gingival margins of the four incisors (similar to the bulge on the maxillary). Wax canine eminences (not as prominent as on the maxillary).
Posterior gingival bulge should be convex with no root prominence. Place concavity between gingival bulge and peripheral roll. Carve the gingival margins and remove all excess wax from teeth.
Contour the interdental papilla. Flame it with a Hanau torch to smooth it. Use a sharp instrument to remove any wax around gingival margins of each tooth.