International Journal of Computerized Dentistry, 04/2006

Because of the developments in the field of all-ceramic materials, which have quite different material properties compared with traditional materials for prosthetic treatment, it was also important to adapt the preparation to the new circumstances. Practiced design guidelines for the restorative treatment of teeth for allceramic restoration are illustrated in this article. Based on traditional retentive preparation shapes, modifications of these geometries "designed for ceramics" were developed and postulated. Despite excellent 15-year long-term results, it is important to draw the appropriate conclusions from failures that have occurred. The geometry of the cavities for all-ceramic inlays must be matched much more to the material-specific properties of hard and brittle restoration materials. Cavities designed for ceramics must therefore have the simplest possible basic geometry. Because of adhesive bonding, a retentive shape of the preparation is not necessary. Previous ceramic inlay designs must be redefined to achieve an increase in the fracture resistance of the ceramic. Parole chiave: CAD/CAM technology, strength characteristics, preparation backgrounds, hard core materials, static load test, all-ceramic restoration

Real-time image analysis in endodontics opens new options of treatment support in dentistry. Imaging software was developed to detect the root canal orifices in video sequences of trepanated teeth acquired by a digital video microscope, the Motic DM 143. The software developed is capable of communicating with any video camera connected to it and can automatically detect almost all root canal orifices in trepanated teeth. To recognize the root canal orifices we used the socalled Minimum-Distance Classification. The Minimum-Distance Classification provides a color-based pattern recognition algorithm, which is directly implemented in the function accessing the video stream, and is therefore very fast. Processing speed varied between 30 and 64 ms per image with an input image resolution of 352 x 288 pixels on the Pentium 4 computer (2 GHz). The developed software was tested in this study on 78 trepanated teeth. The mean detection sensitivity of the software found for all 78 teeth is 97.01%. Parole chiave: Intraoralcamera, computer vision, digital microscope, root canals, endodontics

Obiettivo: ripristino dell'elemento dentario completo in regione 2.5 in un'unica seduta ambulatoriale tramite posizionamento di un impianto conico a carico immediato, abutment in titanio/zirconia e corona in ceramica integrale definitivi. Metodo e Materiali: l'intervento chirurgico viene programmato con l'utilizzo di software per elaborazione di immagini di C.T.Scan, utili per realizzare un modello virtuale tridimensionale. Sulle immagini di quest'ultimo è possibile effettuare il posizionamento della fixture implantare virtuale, secondo quote crestali ed assi che verranno riportati sugli analoghi degli impianti nei modelli in gesso, tramite una procedura di trasferimento, la "Ray Set implant ready to load ®" sviluppata sul Ray Set Apparatus (Biaggini Medical Devices La Spezia - Italy). E' stato scelto ed utilizzato un impianto conico Exacta CV Ø 4,00 (Biaggini Medical Devices La Spezia - Italy) per le caratteristiche di stabilità primaria, requisito essenziale per il carico immediato.1 Sull'abutment implantare Exacta Z.CAD, la corona in ceramica integrale è stata realizzata con Cad-Cam System. Conclusione: l'utilizzo di metodiche informatizzate consente la definizione di un progetto chirurgico subordinato alla programmazione protesica su impianti e la precostruzione di mesostrutture e sovrastrutture finalizzate al carico immediato Chairside2, per un intervento in un'unica seduta ambulatoriale, ottimizzando il risultato estetico/funzionale con una buona predicibilità di durata. Parole chiave: Cad-Cam, Ray-Set, Flapless, Carico Immediato, Ceramica Integrale, Add-on