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ePaper created 2018-04-10, 12:30:21 | version 1.38.0
Fig. 4a Fig. 4b Fig. 5a Fig. 5b Fig. 6 Figs. 4a & b: Preliminary models. Figs. 5a & b: Individual trays. Fig. 6: Occlusal plane setting. using Schreinemakers trays. In order to stabilise and sup- port the impression material, a moulding wax was adapted to their surface (Cera Azzurrina Morbidissima, Zeta). The adhesive for the alginate was applied to the surface of the prepared trays (Fix Adhesive, Dentsply Sirona). The first impressions were taken according to a two- phase technique and a high-consistency alginate was used. After removing the impression, it was prepared by removing the undercuts in order to support relining with a low-viscosity alginate. The adhesion between the algi- nates was promoted by drying the first material. Preliminary models and tray construction Preliminary models were poured using Class III plaster (Elite Model, Zhermack) according to the manufacturer’s instructions (Figs. 4a & b). Once the models had been squared and finished, the extension of the individual impression trays was drawn. Undercuts were eliminated with Tenasyle wax (Imadent) and models isolated using Separating Fluid (Ivoclar Viva- dent). The trays were prepared with a self-curing resin (SR Ivolen, Ivoclar Vivadent). The trays were finished to a thickness of 2 mm, except for the borders in the sub- lingual areas and the retro-zygomatic areas, where they were about 3–4 mm thick. On the basis of the trays, the wax rims were melted simulating the dental arches’ volume in order to aid the clinician in taking a closed-mouth-impression. For the lower base, Tenasyle wax was used and Moyco Beauty Pink X-Hard Wax (Moyco Industries) for the upper base. For the upper wax rim, the average of distance between the vestibular sulcus and the incisal edge was set to 26 1 2018