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ePaper created 2018-04-10, 12:30:21 | version 1.38.0
Fig. 7a Fig. 7b Fig. 8a Fig. 8b Fig. 9 Fig. 10a Fig. 10b Figs. 7 & 8: Bordering and definitive impressions. Fig. 9: Definitive impressions and centric relation registration. Figs. 10a & b: Positioning models in the articulator. 22 mm at the level of the central incisors and 18 mm at the molar region. The incisal edge of the upper wax rim was positioned about 8–10 mm forward of the centre of the incisive papilla, with an inclination of about 20° on the sagittal plane. Regarding the lower jaw, the rim was prepared main- taining a distance between the labial sulcus and the in- cisal edge of 18 mm in the anterior and posterior regions. It was positioned corresponding to the mandibular alve- olar ridge and tilted about 8–10° on the sagittal plane. The rims were realised simulating an arch in accordance with the anatomical trend of the residual ridges. More- over, they were taken to a thickness of about 2–4 mm in the incisal region and about 8–10 mm in the molar re- gion. Finally, the lower wax rim was extended posteri- orly to the point where the ramus of the mandible be- gins to curve up. The posterior limit of the upper wax rim was set to the mesial limit of the maxillary tuberosity (Figs. 5a & b). Closed-mouth definitive impressions The stability and the adaptation of the impression trays were checked. After that, the border length and thick- ness were verified using a silicone-based paste (FIT CHECKER II, GC). In the next phase, evaluating the support of the pa- tient’s lips, the rims were adapted. The upper rim was orientated parallel to the Camper’s plane and the mid- line was recorded on it. Thus, phonetic tests were performed (“f”, “v” and “s”) in order to establish the position of the anterior teeth, and to allocate the space between the upper and lower planes. The vertical di- 1 2018 27