GAP Australasian-Dentist-May June 2019

Category 74 AustrAlAsiAn Dentist Key words: Carbon fibre; occlusal overload; periimplantitis; framework; fixed implant rehabilitation; composite. INTRODUCTION until the beginning of the ‘80s, oral restorations over implants were made using gold alloys covered with resin or composite for aesthetical reasons. 1 in the ‘90s, as gold price started to rise, non- precious metals, ceramics and zirconia appeared as restoration materials. 2-4 these materials have physical and chemical properties very different from gold alloys. they are rigid and hard, as opposed to gold alloys, that are ductile, flexible and soft. 5 As for aesthetical covering materials, acrylic resins and composites show a wear resistance similar to tooth enamel, as compared to dental porcelains that are highly abrasive. 6-10 the extreme rigidity of the rehabilitation materials currently used, such as cobalt-chromium (Co-Cr) and zirconia, and the use of ceramic materials for aesthetical covering, transfer occlusal stress to the peri-implant area without any capacity to absorb it. On the other hand, the prevalence of peri-implantitis as mentioned in the literature is about 30 to 56%. 11-14 the presence of overload and gingival inflammation, at same time, have been associated with the increase of peri-implantitis. 11-14 the use of carbon fibre with composites, acrylic resins or ceramic for aesthetical covering could minimize this problem as a result of the absorption of the loads transmitted on dental implants. 15-20 Carbon fibre reinforced composite (CFrC) shows a ductility and flexibility similar to gold alloys at a lower cost and is biocompatible, 28-33 corrosion resistant 34 and a good thermal and electrical insulator. 35,36 these properties make it an interesting alternative to the materials currently used to make structures over teeth or implants. the aim of the article is to present with two case report the use of CFrC in a full-mouth fixed implant rehabilitation. CLINICAL REPORT Case 1. A 65 years old female, with superior and inferior partial edentulism and vertical and horizontal bone reabsorption (class Vi Cawood) in the upper left and right quadrant came to the clinic to have an oral restoration (Figure 1a–c). the short- term prognosis was bad for all her teeth, and therefore the decision was to extract all of them and to make two full fixed rehabilitations implant (seven, Mis, israel) supported with a CFrC full-arch framework and an aesthetical/functional covering in compacted or packaged composite. to make the final prostheses the upper and lower CFrC (MicroMedica srl, italy) frameworks were made from the waxing of the frameworks (Figure 2). the way of this technique, consists in to mixt the powder of carbon and epoxy resin and, the other hand, to mixt the filaments of Utilization of carbon fibre as a material for a prosthetic framework over implants By Oriol Canto-Naves, DDs, PhD(1), Raul Medina-Galvez, DDs, Professor (1), Josep Cabratosa-Termes, DDs, PhD(1), (1) Department of rehabilitation and Aesthetic restorative, universitat internacional de Catalunya (uiC), Barcelona, spain. Josep Torrents-Nicolas, Dental technician. Department of rehabilitation and Aesthetic restorative, universitat internacional de Catalunya (uiC), Barcelona, spain. Angelo Di Franco, Dental technician. 3DeltaDental. Brisbane. Australia Corresponding author: Dr. Oriol Canto-Naves, Department of rehabilitation and Aesthetic restorative, universitat internacional de Catalunya. Josep trueta s/n, sant Cugat del Vallès 08195, Mail: oriolcanto@uic.es lInICal Figure 1a & b. Initials study models. Figure 1c. Panoramic x-ray.