Double scanning method for computer aided design and computer aided manufacture all-ceramic restorations / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To introduce the double scanning for producing computer aided design and computer aided manufacture (CAD-CAM) zirconia crowns, and to compare Procera with Everest CAD-CAM system by observing clinical effects of the crowns.</p><p><b>METHODS</b>Forty CAD-CAM zirconia crowns (10 crowns by Procera, and 30 crowns by Everest) were evaluated, and the examination criteria included: marginal fit, aesthetics, gingival health, retention, and fracture. All of the zirconia copings were produced using double scanning. Procera system and Everest system use contact scanner and optical scanner respectively.</p><p><b>RESULTS</b>The observation time for the crowns ranged from 6 to 24 months. The results of clinic evaluation were acceptable in all restorations.</p><p><b>CONCLUSIONS</b>Double scanning could be used to produce complicated zirconia copings by CAD-CAM in order to get proper symmetrical porcelain length. It was easier to make complicated coping with contact scanner than with optical scanner.</p>

Clinical application of anterior all-ceramic cantilevered resin-bonded fixed partial dentures / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To explore a fabricating method of incisor all-ceramic cantilevered resin-bonded fixed partial denture (RBFPD) and evaluate their clinical performances.</p><p><b>METHODS</b>All-ceramic cantilevered RBFPDs were made to replace 1 missing incisor in each of 10 patients. The RBFPDs with lingual surface retainer were made of Empress II ceramic materials and luted with resin cement. The prostheses were examined at 2 weeks, 1 year and 2 years after denture insertion. Examining criteria included: fracture of bridge, marginal adaptation, secondary caries, and color match.</p><p><b>RESULTS</b>The average follow-up period was 14. 7 months. No framework fracture and retainer debonding were observed and marginal adaptation was evaluated as good. Seven RBFPDs matched the color of adjacent teeth, and other three did not match well but within the acceptable range of tooth shade difference.</p><p><b>CONCLUSIONS</b>The results of this preliminary study suggest that the clinical performances of all-ceramic cantilevered RBFPDs are good in short-term evaluation, but their long-term success needs to be further investigated.</p>