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1.
Gen Dent ; 69(3): 42-45, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33908877

RESUMEN

The aim of this study was to compare PETG/TPU (polyethylene terephthalate glycol/thermoplastic polyurethane) with PETG (polyethylene terephthalate glycol), based on color stability and microhardness. Sixty circular specimens (10 mm in diameter × 3 mm thick) were fabricated (30 PETG/TPU and 30 PETG). The specimens in both groups were submitted to 2000 thermal cycles in alternating baths of 60 seconds at 5°C ± 1°C and 55°C ± 1°C. The specimens were then divided into subgroups (n = 10) that were disinfected 15 minutes per day for 60 days in 1 of 3 solutions: liquid soap, 2% chlorhexidine, or Listerine. Color change (∆E*) and Knoop microhardness tests were performed at baseline (T0), after thermocycling (T1), and after disinfection (T2). Analysis of variance (ANOVA) and Tukey test were used (P < 0.05). ANOVA showed that there was no statistically significant difference in color change between the 2 materials after thermocycling (∆E*1) or after disinfection (∆E*2), regardless of the disinfectant. Intragroup comparisons (Listerine, liquid soap, and 2% chlorhexidine) of the 3 PETG/TPU groups or 3 PETG groups after disinfection revealed no statistically significant difference for microhardness. Comparison of PETG/TPU with PETG based on the overall mean microhardness showed that the PETG/TPU had a significantly greater mean surface hardness value (P < 0.05). The Tukey test revealed statistically significant increases in microhardness at T1 and T2 for PETG/TPU and PETG so that T0 < T1 < T2 (P < 0.05). Both thermoplastic materials demonstrated an increase in hardness after thermocycling and after disinfection, and both showed similar color changes regardless of the disinfection method. Based on the color evaluation, the liquid soap proved to be the best option for disinfection of PETG/TPU and PETG, because the color change (∆E* value) was clinically acceptable for both materials.


Asunto(s)
Desinfectantes , Desinfección , Color , Dureza , Humanos , Ensayo de Materiales , Ferulas Oclusales , Propiedades de Superficie
2.
Cont Lens Anterior Eye ; 38(6): 414-8, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26066757

RESUMEN

This study investigated the effects of the ocular prosthesis fabrication technique and the paint on the color stability of the artificial iris button before and after polymerization of the colorless resin. Sixty samples simulating artificial eyes were made, including 30 samples with blue- and 30 samples with sepia-colored artificial irises. Ten samples were made by each of three techniques (i.e., conventional, prefabricated cap, and inverted painting) for each color. The color of the artificial iris button was measured through reflection spectrophotometry by the CIE L*a* b* system before and after polymerization of the prosthesis (colorless resin). Data were evaluated by analysis of variance (ANOVA) and the Tukey honestly significant different (HSD) tests (α=0.05). All of the samples exhibited color changes. Samples made by the prefabricated cap technique exhibited the highest color change values for both colors (P<.05). The inverted painting technique exhibited the lowest color change values for the sepia-colored artificial irises (P<.05). Sepia-colored artificial irises exhibited lower color change values than blue-colored artificial irises for both techniques (P<.05). In conclusion, the technique used to obtain the ocular prosthesis significantly affected the stability of the artificial iris color for each color tone and the conventional technique and the painting technique inverted were considered clinically acceptable for sepia color.


Asunto(s)
Resinas Acrílicas/química , Ojo Artificial , Iris , Coloración de Prótesis , Estética , Ensayo de Materiales , Polimerizacion , Prótesis e Implantes , Espectrofotometría
3.
Ann Med Surg (Lond) ; 4(2): 200-3, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-26052437

RESUMEN

INTRODUCTION: The treatment of orofacial tumors may cause facial deformities by losses of structures that affect basic functions, i.e. feeding, speech, and the reduction of patient self-steam. PRESENTATION OF CASE: A white male patient was diagnosed with epidermoid cancer on the mandibular alveolar ridge with infiltration staging IV A. The patient was submitted to a mandibulectomy associated with a complete extraction of mandibular teeth. For rehabilitation, a conventional denture for the mandibular arch and a removable partial denture for the maxillary arch were fabricated. A correct occlusal adjustment and a satisfactory amount of alveolar bone was favorable for conventional dentures of the prostheses bases improve their retention and stability. After one year of follow-up, the patient was adapted to the prostheses, satisfied with their retention, and reported an improvement on his feeding. DISCUSSION: The prosthetic rehabilitation of patients after a partial mandibulectomy is essential for their self-steam. Conventional dentures may have their retention and stability improved if they are well fabricated, recorded and have a balanced occlusion. CONCLUSION: A correct occlusal adjustment and an adequate retention of the prostheses bases may improve their retention and stability. Patients without xerostomy and with a satisfactory amount of alveolar bone may have a favorable prognosis for conventional dentures.

4.
Int J Surg Case Rep ; 7C: 149-53, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25618842

RESUMEN

INTRODUCTION: The aim of this paper was to present a rehabilitation of a patient with a dynamic universal castable long abutment (UCLA) for a single tilted implant in the anterior maxillary area. PRESENTATION OF CASE: A 57-year-old male patient attended the dentistry college clinic complaining of a vertical fracture of a residual root of the dental element 22. The tooth extraction was indicated for the implant installation. Due to the socket buccal wall thickness, the implant was installed with an inclination to the palate. It was done in a two-stage surgical protocol, and an external hexagon implant (3.75×11.5mm) was placed. After a six-month healing period to correct the implant position, a dynamic UCLA was set in place, rectifying the implant emergence profile at 20°. The ceramic structure fitting was performed and, after the patient's consent, the prosthesis was finalized and installed. DISCUSSION: After a follow-up period of twenty months, no complications were observed. CONCLUSION: The installation of tilted implants with a dynamic UCLA may be a viable option, faster and less invasive than bone grafts.

5.
Clin Oral Implants Res ; 26(6): 701-8, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24689971

RESUMEN

OBJECTIVES: The aim of this study was to evaluate the quality of life and satisfaction of patients wearing implant-supported fixed partial dentures. MATERIALS & METHODS: A total of 106 patients were selected and submitted to clinical examination and collection of the demographic data for evaluation of the implant-supported fixed dentures conditions. All participants agreed to answer to the Oral Health Impact Profile (OHIP-EDENT) questionnaire and another questionnaire about satisfaction with the implant-supported prostheses. The patients were classified into the following three groups for statistical analysis: patients wearing splinted implant-supported prosthesis (E), patients wearing single implant-supported prosthesis (U), and patients wearing single implant-supported prosthesis associated with splinted prosthesis (E + U). Kruskal-Wallis test was used to compare the answers between the groups, and a logistic regression model was measured to verify the relation between variables of the patients and the questionaries' items. RESULTS: There were significant differences among groups (P = 0.006) for discomfort during surgery itself of the satisfaction questionnaire. The marital status, groups, and hygiene condition were significant mainly for physical pain item. CONCLUSIONS: It was concluded that the patients presented high level of satisfaction and quality of life for the most of the items evaluated as well as the groups showed similar results.


Asunto(s)
Implantes Dentales , Prótesis Dental de Soporte Implantado , Dentadura Parcial Fija , Satisfacción del Paciente/estadística & datos numéricos , Calidad de Vida , Brasil , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Salud Bucal , Encuestas y Cuestionarios
6.
J Craniofac Surg ; 23(4): 1201-2, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-22801128

RESUMEN

The objective of the study was to report the prevention of facial reinjury of a volleyball player using a custom-made protective facial shield. A custom-made protective partial facial shield was fabricated using polymethylmethacrylate and was fitted with a soft lining material to provide additional comfort and protection to the injured area. Facial protection provides greater security against possible facial injuries and allows injured areas to recover during sports practice.


Asunto(s)
Traumatismos en Atletas/prevención & control , Traumatismos Faciales/prevención & control , Dispositivos de Protección de la Cabeza , Voleibol/lesiones , Diseño de Equipo , Humanos , Masculino , Polimetil Metacrilato
7.
J Craniofac Surg ; 22(3): 797-800, 2011 May.
Artículo en Inglés | MEDLINE | ID: mdl-21558947

RESUMEN

Complete and partial loss of maxillary bone may jeopardize oral physiology and generate complications as oral-sinus-nasal communication. Palatal obturator prostheses are a treatment alternative for rehabilitation of these patients. The aim of this study was to assess stress distribution, through photoelasticity, on palatal obturator prostheses associated with different attachment systems (o'ring, bar clip, and o'ring/bar clip) of implants and submitted to relining. Two photoelastic models were fabricated according to an experimental maxillary model with oral-sinus-nasal communication. One model did not present implants, whereas the other included 2 implants with 13.0 mm in length in the left ridge. Four colorless maxillary obturator prostheses were fabricated and relined with soft silicone. One of these prostheses presented no attachment system, whereas the remaining prostheses included attachment systems adapted to the implants. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope during loading with 100 N at 10 mm/s. The results were based on observation during the experiment and photographic records of stress on the photoelastic model. The bar clip system exhibited the highest stress concentration followed by o'ring/bar clip and o'ring systems. The attachment systems presented different stress distribution with greater concentration surrounding the implants and homogenous stress distribution on the photoelastic model without implants. The highest concentration of fringes occurred, in ascending order, with o'ring, o'ring/bar clip, and bar clip systems.


Asunto(s)
Retención de Prótesis Dentales/métodos , Prótesis Dental de Soporte Implantado , Maxilar/cirugía , Obturadores Palatinos , Fenómenos Biomecánicos , Análisis del Estrés Dental , Alineadores Dentales , Humanos , Luz , Ensayo de Materiales , Fotograbar , Diseño de Prótesis , Propiedades de Superficie , Titanio
8.
J Craniofac Surg ; 22(2): 766-9, 2011 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-21415662

RESUMEN

The matching of the aesthetic, functional, and psychosocial results of a facial deformity may produce devastating effects in its carriers, especially if the lesion is extensive or the treatment is aggressive. Because of this, the objective of the present article was to evaluate patient's satisfaction rating after surgical facial reconstruction or rehabilitation with oral and maxillofacial prosthesis, by means of reviewing the literature.


Asunto(s)
Prótesis Maxilofacial , Satisfacción del Paciente , Procedimientos Quirúrgicos Reconstructivos/métodos , Humanos , Resultado del Tratamiento
9.
J Craniofac Surg ; 22(1): 241-2, 2011 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-21239918

RESUMEN

The use of craniofacial implants is an effective treatment for patients with deformities, burns, and cancer sequelae. The sites with the most successful implants are the auricular, nasal, and orbital regions. Furthermore, other factors can affect the implant longevity such as irradiated area, surgical technique, bone quality and quantity, macrostructure and microstructure of the implant, maintenance, and systemic factors.


Asunto(s)
Anomalías Craneofaciales/cirugía , Procedimientos Quirúrgicos Orales , Prótesis e Implantes , Humanos , Oseointegración
10.
Cont Lens Anterior Eye ; 33(5): 215-8, 2010 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-20452270

RESUMEN

PURPOSE: The purpose of this study was to investigate color change of irises obtained by both printed digital image and painted with gouache, acrylic and oil paints, after polymerization and accelerated aging. MATERIALS AND METHODS: Eight samples simulating ocular prostheses were fabricated. Each sample was constituted by one disc of N1 colored acrylic resin and one disc of colorless acrylic resin with the iris interposed between the discs. The irises in brown and blue color were obtained by painting or by digital image. The specimens' colors were measured with a spectrophotometer using the CIE L*a*b* system, at baseline (B), after polymerization (P), and after 504h (A(1)) and 1008h (A(2)) of accelerated aging. The data were evaluated by 2-way repeated-measures ANOVA and the Tukey's HSD test (alpha=.05). RESULTS: Color change was observed in all samples both after polymerization and after accelerated aging. The different periods of accelerated aging did not influence on color change for the irises painted with blue oil paint. The polymerization promoted a statistical significant effect on the iris color stability for all painting techniques in comparison to all accelerated aging periods. CONCLUSION: After accelerated aging the oil painting technique showed the greatest color stability while the printed digital images technique the worst.


Asunto(s)
Ojo Artificial , Iris , Polimerizacion , Coloración de Prótesis , Análisis de Varianza , Humanos , Procesamiento de Imagen Asistido por Computador , Pintura , Impresión/métodos , Factores de Tiempo
11.
J Craniofac Surg ; 21(2): 396-9, 2010 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-20186076

RESUMEN

Cancer is regarded as the abnormal cellular multiplication; it is not controlled by the organism; and its cells present a differentiated DNA. Initially, the disease does not show clinical signs, but it can be diagnosed by laboratorial examinations. When tumors are present in the maxillofacial area, they can entail the loss of these area organs, which become responsible for the carrier's social environment exclusion. This paper aimed at showing, through a literature review, the cancers that more commonly happen in the face and the possibilities of regenerating in the patient mutilated through surgical reconstruction and prostheses.


Asunto(s)
Neoplasias Faciales/cirugía , Neoplasias de Cabeza y Cuello/cirugía , Neoplasias Maxilomandibulares/cirugía , Prótesis e Implantes , Procedimientos Quirúrgicos Reconstructivos/métodos , Neoplasias del Ojo/cirugía , Humanos , Neoplasias Palatinas/cirugía , Neoplasias de la Lengua/cirugía
12.
J Craniofac Surg ; 20(6): 2238-41, 2009 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-19934680

RESUMEN

Many studies on defects caused by trauma, infection, cancer, or congenital are reported in the literature; in nasal reconstructions, contradictions and distinct techniques exist that can be argued. Using the literature, we observe these distinct techniques that can be surgery or in surgery to reestablish and to integrate the patient with satisfaction in the society.


Asunto(s)
Deformidades Adquiridas Nasales/cirugía , Neoplasias Nasales/cirugía , Rinoplastia/métodos , Humanos , Prótesis e Implantes , Colgajos Quirúrgicos
13.
J Craniofac Surg ; 20(5): 1519-22, 2009 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-19816289

RESUMEN

Osseointegration was an innovative treatment in dentistry during the last 3 decades. The success of osseointegration is related to factors such as material biocompatibility, adequate quality of bone tissue that allows implantation, surgical technique, and macrostructure and microstructure of implant. The osseointegrated implants are successfully applied in dental clinic including oral and facial rehabilitations mainly for patients submitted to mutilating surgeries. However, patients submitted to radiation therapy present risks to treatment with implants owing to adverse effects on bone tissue. Nowadays, the literature suggests different therapies to improve the success of osseointegration such as hyperbaric oxygen therapy that aims to prepare bone and adjacent tissues to receive the implant. Therefore, the purpose of this study was to present a literature review concerning indications, contraindications, successes, and difficulties with hyperbaric oxygen therapy associated to maxillofacial implants.


Asunto(s)
Implantes Dentales , Oxigenación Hiperbárica , Oseointegración/fisiología , Contraindicaciones , Neoplasias de Cabeza y Cuello/radioterapia , Neoplasias de Cabeza y Cuello/cirugía , Humanos , Oxigenación Hiperbárica/métodos , Maxilares/efectos de la radiación , Terapia Neoadyuvante , Procedimientos Quirúrgicos Ortognáticos , Resultado del Tratamiento
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