RESUMO
This article describes a method for making a palatal expansion device for use in conjunction with orthopedic repositioning of the premaxilla in patients with bilateral cleft palate. The technique of constructing the devices involves the microwave processing of a permanent soft liner and a heat-cured acrylic resin in a single-stage curing cycle. The resultant expansion device has the advantages of a soft liner for retention in the nasal cavity and an oral cavity surface that is smooth and closely adapted to the tissues. A paper cover is used during the flasking process, which allows packing of materials without displacement into undesirable locations.
Assuntos
Aparelhos Ativadores , Fissura Palatina/terapia , Micro-Ondas , Desenho de Aparelho Ortodôntico , Técnica de Expansão Palatina/instrumentação , Resinas Acrílicas/química , Materiais Biocompatíveis/química , Fenda Labial/terapia , Dimetilpolisiloxanos/química , Humanos , Obturadores Palatinos , Desenho de Prótese , Elastômeros de Silicone/química , Propriedades de SuperfícieRESUMO
A technique for fabrication of a flexible shielded afterloaded silicone nasal radiation carrier is described. The technique uses a rubber base impression of the nasal cavity from which a silicone radiation carrier is made. Plastic tubes for afterloading of the radioactive sources and a lead shield were incorporated into the carrier. The carrier permitted accurate location of the radioactive sources in the nasal cavity and reduced the radiation exposure.
Assuntos
Braquiterapia/instrumentação , Cavidade Nasal , Neoplasias Nasais/radioterapia , Elastômeros de Silicone , Desenho de Equipamento , Humanos , Chumbo , Doses de Radiação , Proteção Radiológica/instrumentaçãoRESUMO
This article describes a technique of making custom flexible and combined flexible/rigid tracheostoma vents. The combined flexible rigid tracheostoma vent provides a flexible material that is nonirritating in the peristomial region and maintains a patent tracheostoma by the rigidity of the hard acrylic resin section. The flexible tracheostoma vent can be easily inserted and is more comfortable than the rigid commercially available tracheostomy tube. The use of microwave-cured materials permits fabrication during a single visit. The steps involved in the fabrication of the tracheostoma vents are simple and require no elaborate laboratory equipment.
Assuntos
Resinas Acrílicas/química , Materiais Biocompatíveis/química , Dimetilpolisiloxanos , Micro-Ondas , Elastômeros de Silicone/química , Traqueostomia/instrumentação , Elasticidade , Desenho de Equipamento , Humanos , Propriedades de Superfície , Estenose Traqueal/prevenção & controleRESUMO
This article describes a procedure for making a denture reline jig for processing denture base resin in a microwave oven. The jig is intended for use with the newer microwave curing denture base resins. The reline jig is economical to produce and is made from fiberglass liquid resin commonly used in automobile body repairs. The fiberglass liquid resin is strengthened by adding fillers of dental stone and chopped fiberglass strands.
Assuntos
Bases de Dentadura , Planejamento de Dentadura/instrumentação , Reembasamento de Dentadura/instrumentação , Micro-Ondas , Sulfato de Cálcio , Desenho de Equipamento , Vidro , Resinas Sintéticas/química , SiliconesRESUMO
The use of visible light-cured (VLC) resin was evaluated in contrast to more traditional chemical-cured resins for reconstruction of the spine in experimental rats. Such procedures are used to reconstruct vertebra in humans following corpectomy for neoplastic destruction of the spine. Numerous disadvantages exist in the use of chemical-cured resins, including excessive heat generated during the polymerization, cytotoxic effects of the nonpolymerized monomers on adjacent tissues, increased risk of infection due to impaired immunity, and distortion problems with the polymers. A new visible light-cured resin, Triad, was tested for use in maxillofacial prosthetics and for vertebral body replacement in neuro-orthopedic surgery. This study evaluated the biocompatibility of the VLC resin system as a bone implant material. The results of this study have shown the VLC resins underwent polymerization without substantial exothermic reaction and the biologic testing indicated that they are nontoxic and biocompatible. Some of the advantages noticed by using VLC resin are accuracy of fit and ease of fabrication and manipulation.
Assuntos
Resinas Acrílicas , Vértebras Cervicais/cirurgia , Próteses e Implantes , Resinas Acrílicas/química , Animais , Materiais Biocompatíveis/química , Vértebras Cervicais/diagnóstico por imagem , Vértebras Cervicais/patologia , Craniotomia , Ingestão de Alimentos/fisiologia , Estudos de Avaliação como Assunto , Marcha/fisiologia , Luz , Prótese Maxilofacial , Metilmetacrilato , Metilmetacrilatos/química , Neurônios Motores/fisiologia , Músculos/inervação , Músculos/fisiologia , Neurofisiologia , Projetos Piloto , Radiografia , Ratos , Ratos Endogâmicos , Crânio/cirurgiaRESUMO
One can make a microwavable denture flask that will accommodate obturators and other large intraoral prostheses. A method for making a dental stone flask pattern and a latex mold makes it possible to produce fiberglass flasks strong enough for compression molding. These flasks are economical to produce and are made from the fiberglass liquid resin that is used in automobile body repairs. The fiberglass liquid resin is strengthened by the addition of dental stone and chopped fiberglass strands. The resultant flasks allow successful microwave polymerization of acrylic resin for denture bases while still being able to follow conventional flasking and packing techniques.
Assuntos
Equipamentos Odontológicos , Micro-Ondas , Desenho de Equipamento , VidroRESUMO
To determine whether clinical experience influenced dental students' ability to correctly design removable partial denture frameworks, four combinations of six casts depicting various partially edentulous situations were used in the study. The authors independently rated the casts as to the degree of difficulty on a three-point scale. Only those casts for which there were 100% agreement were used. All of the casts that were used had a moderate degree of difficulty rating (level 2). The dental student sample consisted of 34 second-year students who had just completed 98 hours of instruction in removable partial dentures. Each student was given six casts on which to design removable partial denture frameworks. The students were evaluated before clinical experience in removable prosthodontics and after 1 year of removable prosthodontic experience. The results indicated that the dental students made significantly fewer errors in framework design after clinical experience. Errors on two of 13 framework design items were increased postclinically. The increase in errors on these two items may have been the result of a lack of attention to detail or a lack of reinforcement in learning certain basic concepts.
Assuntos
Planejamento de Dentadura , Prótese Parcial Removível , Educação em Odontologia , Prostodontia/educação , Estudantes de Odontologia , Estágio Clínico , Competência Clínica , Humanos , Arcada Parcialmente Edêntula/reabilitação , Modelos DentáriosRESUMO
The relative pulpal responsiveness of the six maxillary incisors to electrical and cold thermal stimuli was tested in patients with complete unilateral and bilateral clefts. The six maxillary anterior teeth were tested at random to electrical stimuli. After a 5-minute interval, the same teeth were tested at random to cold stimuli with an ice pencil. Unilateral and bilateral cleft palate patients had statistically significant higher mean electrical pulp test thresholds for the maxillary anterior teeth than the noncleft palate patients. No statistically significant difference between unilateral and bilateral cleft palate patients was found in electric pulp test responses of the maxillary anterior teeth. No statistically differences in electric pulp test responses and cold test responses of the maxillary anterior teeth in both cleft palate and noncleft palate individuals based on differences in sex were observed. No statistically significant difference in cold test responses were observed between cleft palate and noncleft palate patients. Cleft palate patients who completed orthodontic treatment within 1 year of testing showed elevated mean electrical pulp test thresholds as did noncleft palate patients who received orthodontic treatment within 1 year of testing.