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ePaper created 2014-10-07, 09:31:41 | version 1.30.01
_Cone-beam computed tomography (CBCT) should be the imaging technique elected for com- prehensive orthodontic assessment. With the pro- gressesmadeinthefieldofCBCTimaging,clinicians can perform exact measurements without the er- rors induced by radiographic projection and land- markidentificationorlocation.Themostimportant argument for the use of CBCT on a daily basis in orthodontics is the accuracy of image geometry. Theuseof2-Dradiographs(panoramicradiographs andlateralcephalograms)isassociatedwithdiffer- ent degrees of image distortion and magnification. In contrast to 2-D images, CBCT achieves a 1:1 ratio of image geometry, which allows adequate linear and angular measurements.1 The quality of CBCT images allows the ortho- dontist to analyse bone, teeth (even unerupted teeth) and soft tissue three-dimensionally. The accuracy of the measurements of the hard and soft tissue on CBCT images permits more compre- hensive and precise diagnostic and treatment planning. It has been proved that landmarks can be located reliably on cephalometric images generated from CBCT data.2 CBCT images can and should be used in differ- ent areas of orthodontic interest. With the help of these 3-D images, it is simpler and more accurate to evaluate the cortical and alveolar bone, the periodontal status of the patient, the teeth (including unerupted and supernumerary teeth) and their relation to the adjacent structures, and the temporomandibular joint (TMJ). Furthermore, from CBCT images, it is easy to extract very precise 2-D images, such as panoramic radiographs or cephalograms. I opinion _ CBCT in orthodontics Fig. 1_Narrow alveolar crest in a 23 agenesis site. Fig. 2_Very thin symphysis with the mandibular anterior teeth in contact with the buccal and lingual cortical plates. Fig. 3_Deep periodontal pockets around the maxillary and mandibular first molars. Fig. 4_Bone fenestration and dehiscence. Fig. 5_Anterior condyle–fossa luxation. The condyle passes anterior to the articular eminence on full opening of the mouth. Fig. 6_Opened functional spaces in a TMJ with a flat condyle. 16 I cone beam3_2014 Fig. 1 Fig. 2 Why using CBCT in orthodontics is necessary Author_Dr Andrei Iacob, Romania CBE0314_16-20_Iacob 30.09.14 14:14 Seite 1