Dental Tribune United Kingdom Edition

www.ctscan.co.uk IDT Dental Products Ltd, Unit GC Westpoint, 36-37 Warple Way, London W3 0RG. Tel. +44 (0)20 8600 3540 i-CAT is a Trade Mark of Imaging Sciences International LLC 2nd Hand i-CAT Next Gen 4 years old, fully maintained unit with Warranty until January 2013 • Flat Panel Sensor Technology – superior 3D image quality with resolutions from 0.4mm down to 0.125mm • Large Scan Height and Diameter – scans up to 13cm in height and 16cm in diameter - perfect for craniomaxillofacial scans or orthodontic applications • Medium Field of View Scans - reduce the scan height and width to 8cm x 8cm – perfect for implant scans • Adjustable scan heights - adjust the scan height from 13cm down to 2cm for routine scans • Fast scan times - 4.8 to 26.9 seconds • Low Dose - measured by SEDENTEXCT to be one of the lowest dose CBCTs on the market in both the maxillofacial and single jaw categories Only One available sO call nOw! CBCT Scanner Full manuFacturer’s warranty attractively priced FOr quick sale! 10396_IDT Leaflet.indd 1 10/08/2012 08:31 arch and three spheres. These are made of calcium-based glass, which has cast-pouring radio- paque properties. The wax is ap- plied during CBCT and is placed between the cast arches during the optical scan (Fig 5). It is remarkable that the wax thickness does not significantly influence the accuracy of the ra- diographic scan and consequently the results of the CA. The software is able to recognise the presence andsizeofthespheresintheCBCT scan and matches them to those corresponding areas on the cast. This is currently the only method that allows for an overlap with an error margin of less than 0.1 mm.7 Once the data has been collected, it is possible to perform different kinds of analyses before the surgi- cal treatment. The software pre- sents powerful segmentation tools that allow the splitting of the maxillo-facial complex from the mandible, providing two separate images. This feature is relevant in or- thodontic and surgical planning for calculating bone movement. The clinician can select the tis- sues to be moved following a procedure similar to the manual one. For example, it is possible to select the osteotomic lines in order to simulate a forwards or backwards mandible shift, finding the exact shift needed (in mm) to properly correct the malocclusion (Fig. 6). Once the bone correction has been finalised, it is possible to create a 3-D orthodontic model and display the resulting dental correction to be obtained by the end of the treatment. Finally, shifting back the bone structure (and the dental arch with the final model) to the origi- nal maloccluded position, it is pos- sible to obtain the target cast to be reached before the surgical treat- ment. On the cast, it is then possi- ble to build successive images us- ing CAD/CAM techniques to track progress towards orthodontic pre- surgical treatment.8 Virtual surgery has a twofold objective: firstly, to verify that the planned shifts are in fact feasible; and secondly, to position the cast according to the ratios needed to build the surgical splint, which will be used during the surgical procedure. The digital cast su- perimposition reduces the treat- ment planning phase, as it is not necessary to reveal the facial arch or to use the articulator. In fact, all the data can be sourced from the combination of the CBCT and cast scans. Recent studies focus on the enhancement of the system through the development of an in- tra-oral scanner, which will allow direct 3-D impressions, skipping the conventional impressions, which-although precise-can be influenced by manual errors.9,10 Although complex, using soft- ware offers many advantages because it enhances both ortho- dontic and surgical techniques, while ensuring a very high quality result. In fact, a CAD/CAM tech- page 24DTà ‘Although complex, using software of- fers many advan- tages because it enhances both orthodontic and surgical tech- niques, while en- suring a very high quality result’ Fig. 5_Reference aligner. Fig 5 23ClinicalOctober 29 - November 4, 2012United Kingdom Edition