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ePaper created 2016-09-20, 16:58:27 | version 1.38.0
Journal of Oral Science & Rehabilitation 22 Volume 2 | Issue 3/2016 H a r d - a n d s o f t - t i s s u e c h a n g e s w i t h a s u p e r i m p o s i t i o n t e c h n i q u e Germany). The stone casts were allowed to set for 2 h before separation from the impressions. Themodelcastswerethenscannedusingboth aconebeamcomputedtomography(CBCT)scan- ner (CRANEX 3D, SOREDEX, Tuusula, Finland) with a 1 mm copper filter and a dental scanner based on conoscopic holography technology (NobelProcera Scanner, Nobel Biocare, Kloten, Switzerland), coupled with dedicated software (NobelProcera). The DICOM and STL files were imported into NobelClinician Software (Nobel Biocare) to per- formthesuperimpositionofthetwodatasets.The DICOMandSTLdatawereautomaticallymatched basedontheadjacentteethandmanuallychecked foracompletematchusingSmartFusiontechnol- ogy (Figs. 6a & b). The hard- and soft-tissue dif- ferences between the two digitized model casts were calculated on 2-D sections taken along the long axes of the restored teeth and along the pa- pillae (Figs.7a–d).9 An independent assessor, not previously involved in the study, scanned and measured all of the model casts. Results Overall, eight patients (two men and sixwomen) with atotalof34 all-ceramicveneerrestorations placed in the esthetically sensitive area of the maxilla (between the canines) were followed for at least oneyearafterdeliveryofthefinalrestor- ations. Ofthese, 16 replaced the central incisors, 14 the lateral incisors, and four the canines. One Fig. 1 Preoperative views revealing worn maxillary anterior teeth. Fig. 2 Diagnostic wax-up. Fig. 3 Direct acrylic mock-up. Fig. 4 Minimally invasive tooth preparation. Fig. 5 One-year postoperative intra-oral view. Figs. 1 & 2 Figs. 3 & 4 Fig. 5