الفهرس | Only 14 pages are availabe for public view |
Abstract Abstract Purpose: To evaluate short and long span polyether-ether-ketone removable partial denture (PEEK RPD) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) technique. Materials and Methods: Twenty maxillary (class II Kennedy) partially edentulous patients opposing almost natural dentition were selected and divided according to length of the edentulous span into two groups (A, B), ten patients each. group A, patients with canine as the last abutment tooth. group B, patients with second premolar as the last abutment tooth. All patients received maxillary PEEK RPD fabricated by CAD/CAM milling technique and evaluated experimentally (dimensional deviation), clinically (denture base deformation, plaque index, gingival index and periodontal pocket depth) and radiographically (bone loss at abutment tooth and edentulous ridge) at time of denture insertion, 6, 12 and 18 follow up periods. Results: In this study, PEEK RPD undergone dimensional deviation with a significant difference at each follow up period in case of short and long saddle cases, but with no significant difference between both groups. The strain recorded during clenching was more than during chewing for short and long saddle cases with a highly significant difference and with higher value for the long saddle cases than short saddle cases with a significant difference during clenching but with no significant difference during chewing. Still the clinical parameter scores were within the acceptable limits as confirmed by results of plaque index, gingival index, periodontal pocket depth, marginal bone loss around abutment tooth and residual alveolar ridge of both groups, there were no significant differences between both groups. Conclusion: Modified PEEK based material can be considered a useful alternative framework material for RPDs restoring Maxillary Kennedy Class II edentulous patients. Wearing of digitally designed PEEK RPD which fabricated by milling technique created a favourable oral environment with the marginal bone loss around abutment tooth and residual alveolar ridge were within the clinically acceptable limit. PEEK RPDs undergo stresses and dimensional deviation at each follow up period in case of short and long saddle maxillary Kennedy class II cases but with a clinically acceptable limits as confirmed by results of this study. Keywords: Maxillary kennedy class II, Polyether-ether-ketone, CAD/CAM technique, Digital dimensional deviation, Strain Gauge. |