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ePaper created 2016-09-20, 16:58:27 | version 1.38.0
Journal of Oral Science & Rehabilitation 44 Volume 2 | Issue 3/2016 A x i a l p l a n e i n c o m p u t e d t o m o g r a p h y Figs. 1a–d Marking the occlusal plane: (a) marking mandibles with teeth intact before multiple exodontias were performed; (b) marking edentulous mandibles; (c) placing the wax piece to simulate the occlusal plane; (d) wax piece divided into 18 parts with lead strips corresponding to the 18 tomographic slices taken of each mandible). Figs. 2a–c Basal plane: (a) positioning of mandibles in PMMA boxes to support the lower edge against the container’s anterior wall; (b) use of the occlusal plane as the axial reference plane; (c) use of the basal plane as the axial reference plane. Figs. 1a & b Figs. 1c & d Figs. 2a–c c b d a b c a B a s a l p l a n e In order to establish a good axial reference from the basal plane, all of the mandibles were pos- itionedinPMMAboxestosupporttheloweredge (basalplane) againstthe container’s anteriorwall (Fig. 2a). D e n t a l C T The CT equipment used was a Toshiba Multi CT scan Aquilion 16 TSX-101A/6A (Toshiba America Medical Systems, Tustin, Calif., U.S.). Thirty-six sagittal tomographic slices were performed for each mandible, 18 taking the occlusal plane as the axial reference plane (Fig. 2b) and 18 using the basal plane (Fig. 2c). The exposure param- eterswere set at 57 Kv, 56 s and 1.0–3.2 mA, and a rectangular collimator was used. The radio- graphicimageswereprocessedusingSIMPLANT software (Materialise Dental, Madrid, Spain). All ofthe measurementswere scored independent- ly by two oral surgeons. When measuring the sagittal tomographic slices, the observers were