Subject(s)
Carbon , Dental Implantation, Endosseous/instrumentation , Surface Properties , Titanium , VitalliumABSTRACT
Mandibular lengthening in mongrel dogs was evaluated in four animals. Extraoral approaches were used for mandibular exposure. Step osteotomies were performed on the buccal aspect and oblique osteotomies were performed on the lingual aspect of the mandible. The anterior fragment of the mandible was advanced 10 mm. A Dacron-urethane mesh tray, in the form of the mandible, was placed across the defect as a container of bone graft material and to help stabilize the segments. The bone graft material was harvested by aspirating the bone particles formed when the osteotomy cuts were made, thus creating a bone slurry which was placed within the implant. The results suggest that the use of the implant tray in conjunction with the bony slurry provided an appropriate physiologic setting for rapid new bone formation, restoring continuity to the defect.
Subject(s)
Alveolar Ridge Augmentation , Oral Surgical Procedures, Preprosthetic , Osteotomy , Animals , Bone Regeneration , Dental Implantation , Dogs , Surgical MeshABSTRACT
The results of this preliminary evaluation of a tooth implant model combining a stylized tooth root design and a thin, highly biocompatible microporous carbon coating, although tentative, add support to the feasibility of developing a statisfactory system for the immediate replacement of selected teeth in healthy bone.
Subject(s)
Carbon , Chromium Alloys , Dental Implantation, Endosseous , Tooth Root , Vitallium , Alveolar Process/anatomy & histology , Alveolar Process/diagnostic imaging , Alveolar Process/physiology , Animals , Biocompatible Materials , Dogs , Evaluation Studies as Topic , Gingiva/anatomy & histology , Osteogenesis , Periodontium/anatomy & histology , Radiography , Surface Properties , Tooth MobilitySubject(s)
Biocompatible Materials , Dental Implantation , Adult , Aged , Animals , Bone Transplantation , Carbon , Dental Alloys , Denture, Partial , Dogs , Epoxy Resins , Female , Humans , Joint Prosthesis , Mandible/surgery , Mandibular Condyle/surgery , Mandibular Prosthesis , Nylons , Polyethylene Terephthalates , Prosthesis Design , Surgical Mesh , UrethaneABSTRACT
The purpose of this study was to evaluate a porous Dacron - urethane mesh tracheal prosthesis in large dogs with surgically created discontinuous defects of the cervical trachea. Some protheses were carbon coated in an attempt to improve biocompatibility. Histology was performed on 2 dogs. The mucosa regenerated entirely covering the prosthesis. Respiratory epithelium was formed over a large central portion of the tracheas.
Subject(s)
Biocompatible Materials , Polyethylene Terephthalates , Prostheses and Implants , Surgical Mesh , Trachea/anatomy & histology , Urethane , Animals , Basement Membrane/anatomy & histology , Carbon , Connective Tissue/anatomy & histology , Dogs , Epithelium/anatomy & histology , Evaluation Studies as Topic , Mucous Membrane/anatomy & histology , Trachea/surgeryABSTRACT
32 carbon coated tooth replicas were implanted in the jaws of 8 mongrel dogs for periods ranging from 3 months to 2 years. Fourteen of 16 molor implants and 10 of 16 premolar implants had 0.5 min. of mobility or less. Histology of specimens from 4 dogs sacrificed at 3 months showed new bone directly in contact with the implant surface.
Subject(s)
Carbon , Dental Implantation , Denture Design , Tooth, Artificial , Alveolar Process/anatomy & histology , Animals , Chromium Alloys , Dogs , Evaluation Studies as Topic , Gingiva/anatomy & histology , Molar/anatomy & histology , Periodontium/anatomy & histology , Tooth RootABSTRACT
22 implants have been carried out in the mandibular arches of 5 dogs for the purpose of assessing the usefulness of a special isotropic carbon coating on vitallium cast dental replicas. Clinico-radiological, histopathological and microradiographic data showed the usefulness of the coating. Permucous acceptability, which is hard to obtain with other materials, proved satisfactory. Anchorage of the replicas to the surrounding bone was good, thus confirming the compatibility and usefulness of the isotropic carbon coating.
Subject(s)
Carbon , Dental Implantation, Endosseous , Animals , Biocompatible Materials , Dental Abutments , Dentures , Dogs , Foreign-Body Reaction , Mandible/physiologyABSTRACT
Thirteen implantations have been made in the mandibular arches of 6 dogs. They consisted of commerical titanium blades and screws and of replicas of extracted dental roots variously shaped and made of titanium. All replicas and some of the commerical implantations were covered with pure aluminium using the plasmajet tecnique. Clinico-radiological, histopathological and microradiographical observation showed that only some of the replicas of dental roots give promising results.
Subject(s)
Dental Implantation, Endosseous , Aluminum , Animals , Ceramics , Dental Materials , Dogs , Metals , TitaniumABSTRACT
Lengthening of the mandibular body in two dogs was achieved with a technique that involved osteotomies and the use of an experimental orthodontic appliance; the approximation of the resected mandibular segments was maintained. There was no damage to the mandibular nerve and no conspicuous alterations of the nerve fibers. On the basis of results in experimental studies, the technique is proposed for use in correction of large discrepancies in length in persons with excessive mandibular retrusion.
Subject(s)
Mandible/anatomy & histology , Orthodontic Appliances , Osteotomy , Traction , Animals , Dogs , Humans , Mandible/physiology , Mandible/surgery , Osteogenesis , Osteotomy/methods , Traction/instrumentationABSTRACT
The procedures used to correct large discrepancies in the length of the mandibular body are described and experimental results are reported. The technique is realized using an orthodontic applicance that permits the progressive lengthening, after osteotomy of the mandibular body and also retains the approximation of the resected mandibular segments. Two dogs were used for the experimentation, achieving mandibular body lengthening of 5 and 15 millimeters. The bone neoformation was studied hystologically by means of microradiography and tetracyclines induced fluorescence. The surgical technique was carried out without damage to the mandibular nerve. The hystological examination shows no conspicous alteration of the nerve fibres.
Subject(s)
Mandible/surgery , Osteotomy , Retrognathia/surgery , Animals , Bone Lengthening/methods , Dogs , Osteotomy/methodsABSTRACT
Recent studies and personal experience of the Authors in the field of dental implants have encountered the same fundamental problem which arises with orthopedic prosthesis procedures. The basic problem is that of adhesion between the bone tissue and the metal implant. Chrome-cobalt alloy, Tantalum and Titanium are the metals of most recent use. The Authors therefore proceeded to investigate the behaviour of alveolar bone tissue in the proximity of artificial teeth made of alloy (platinum-gold) covered with ceramic, as used in prosthetic dentistry. The experiment was carried out in a dog and a man. In the dog, two of its mandibular teeth were substituted with the same ceramic-gold implants: the first, a replica of natural tooth, was placed in the socket and held in place by metal splint and mandibular circumferential wirings. The other implant, without a replicated crown, was left free, within the alveolus, without contacting the near or opposing teeth. A solid smooth surfaced alumina device, shaped like a small cylinder, was implanted in the upper femoral epiphysis of the same animal.
