Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 24
Filtrar
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.
J Prosthet Dent ; 124(6): 815.e1-815.e7, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33268070

RESUMEN

STATEMENT OF PROBLEM: Exposure of silicone prostheses to environmental factors can alter their properties, affecting longevity. However, whether nonthermal plasma (NTP) can prevent these alterations is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the surface roughness (Ra), sorption, solubility, and color stability (ΔE00) of the MDX4-4210 and A-120 silicones, with and without NTP treatment in accordance with an independent analysis of the use of 2 pigmentations. MATERIAL AND METHODS: One hundred sixty specimens were fabricated and distributed into 16 groups (n=10) as per the silicone, pigmentation, and NTP coating. The NTP was applied, and the Ra, sorption, solubility, and ΔE00 were evaluated before and after accelerated aging. ANOVA was used, and the HSD Tukey test was applied (α=.05). RESULTS: NTP generated an increase in roughness after aging, regardless of pigmentation or silicone. A-120 silicone without NTP showed a reduction in roughness after aging, regardless of pigmentation. For sorption and solubility, the bronze pigmentation (for A-120 and MDX4-4210) presented the smallest results after NTP treatment. For MDX4-4210 with pink pigmentation and NTP, sorption decreased and solubility increased. For A-120 with pink pigmentation and NTP, sorption and solubility increased. Sorption was reduced in all situations, except for A-120 with pink pigmentation, which increased. Regardless of the silicone used, solubility was reduced after NTP for bronze pigmentation. For A-120 and MDX4-4210 with pink pigmentation and NTP, the solubility increased. For both pigmentations, the NTP treatment promoted lower color alteration only for the A-120 silicone after accelerated aging (within the acceptability threshold). CONCLUSIONS: The NTP protocol of this study, which was applied to facial silicones, generated inconsistent results between the evaluated properties. Therefore, the NTP protocol used does not seem to be ideal for the treatment of silicone surfaces after aging.

3.
Contemp Clin Dent ; 10(1): 42-46, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-32015640

RESUMEN

Background: The aim of this study was to verify, through self-assessment questionnaires, the influence of implant-supported prosthesis in salivary flow and anxiety of patients rehabilitated with them. Materials and Methods: Visual analog scale (VAS) questionnaire about xerostomia and State-Trait Anxiety Inventory were applied before (T1) and after 2 days (T2) and 3 weeks (T3) of prostheses installation. The study included patients rehabilitated with implant-supported prostheses containing three or more dental elements. A total of 17 patients were evaluated. Results: In VAS questionnaire, there was a significant increase in the difficulty of speaking and swallowing with dry mouth. The other VAS questions showed no statistically significant difference, indicating no changes in patients' salivary flow. Conclusions: It was concluded that the installation of implant-supported prostheses does not lead to major changes in patients' perception about their salivary flow and psychological state, causing no improvement or worsening in the characteristics evaluated.

4.
Int J Dent ; 2019: 2573095, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31933644

RESUMEN

Objective: The aim of this study was to evaluate the tear strength of MDX4-4210 and A-2186 silicones with different intrinsic pigments incorporated by mechanical and industrial methods, comparing nonaged and aged groups. Materials and Methods: Twenty-four groups were created according to the American Society for Testing and Materials D-624/type C, half nonaged and half aged (n = 10): bronze mechanical MDX4-4210, bronze industrial MDX4-4210, black mechanical MDX4-4210, black industrial MDX4-4210, pink mechanical MDX4-4210, pink industrial MDX4-4210, bronze mechanical A-2186, bronze industrial A-2186, black mechanical A-2186, black industrial A-2186, pink mechanical A-2186, and pink industrial A-2186. All specimens were submitted to tear strength analysis. Data were submitted to the ANOVA and Tukey test (p < 0.05). Results: An increase in the tear strength values was observed only for the bronze and black MDX4-4210, comparing nonaged and aged silicones (p < 0.05), regardless of the manufacturing method. There was a difference in all comparisons between MDX4-4210 and A-2186 silicones with the same pigment type (p < 0.05), regardless of the manufacturing method. In all cases, there was no difference in the manufacturing method comparing the MDX4-4210 or A-2186 groups with the same pigment. Conclusion: Accelerated aging did not influence the tear strength in all aged A-2186 silicones and in aged pink industrial and mechanical MDX4-4210 silicones. The other MDX4-4210 groups had an increase in the results after aging. In all cases compared, the A-2186 groups had higher tear strength values than the MDX4-4210 groups. Mechanical and industrial methods can be used for silicone preparation, without changing the tear strength.

5.
J Med Eng Technol ; 42(5): 359-367, 2018 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-30251571

RESUMEN

In some clinical situations, the clinician may encounter previously installed implants that should be associated with other implants for a proper rehabilitation. The aim of this study was to evaluate the biomechanical behaviour of a multiple prosthesis joined by different implant connections using photoelasticity. Photoelastic models with a screwed fixed prosthesis supported by implants with different connection systems (Morse taper, external hexagon, internal hexagon, and Flexcone), and different combinations among them, were fabricated. Each assembly was placed in a circular polariscope, and axial and oblique (45°) loads of 100 N were applied on the occlusal surface of the crowns. The fringe patterns were photographed and the analysis was performed by counting the number of high-intensity fringes and also according to the stress distribution region where they appeared. Among implants of the same connection, the external connections obtained a greater number of high intensity fringes when compared to the internal connections. From the biomechanical point of view, the association between different types of connections obtained positive results.


Asunto(s)
Prótesis e Implantes , Fenómenos Biomecánicos , Estrés Mecánico
6.
Acta Odontol Scand ; 76(8): 628-637, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-30156132

RESUMEN

INTRODUCTION: For many years, edentulous patients have had no other option than conventional dentures to reestablish their oral function. To avoid the need for bone graft surgery, some professionals have suggested the use of mini dental implants (MDIs) to support prostheses. The MDIs are narrow implants, ranging approximately from 1.8 to 2.9 mm in diameter. Recently, the promising results of mini implants regarding osseointegration and patient satisfaction have led clinicians to accept them as a definitive treatment option. OBJECTIVE: Therefore, the proposition of this systematic review was to assess information on the outcomes of MDIs supporting removable prostheses. METHODS: The PubMed and Cochrane databases were searched for articles published before September 2017, which yielded a total of 774 studies for analysis. After exclusion and inclusion criteria, 22 prospective studies were included in this systematic review. RESULTS: Most mini implants were placed in a flapless single-stage surgery and loaded immediately. Most studies reported failures in the first year and prosthetic complications. The mean survival rate of the selected studies was 95.6%, and mean follow-up was 22.8 months. CONCLUSION: The MDI-supported removable prostheses successfully improved patients' chewing and speaking ability, quality of life, and satisfaction, suggesting that MDIs are a viable and safe option to support removable prostheses in the mandibular arch.


Asunto(s)
Diseño de Prótesis Dental , Dentadura Parcial Removible , Satisfacción del Paciente , Calidad de Vida , Anciano , Prótesis Dental de Soporte Implantado , Femenino , Humanos , Masculino , Masticación , Persona de Mediana Edad , Boca Edéntula/cirugía , Oseointegración , Estudios Prospectivos , Resultado del Tratamiento
7.
Int J Oral Maxillofac Implants ; 33(4): 815-823, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30024997

RESUMEN

PURPOSE: To investigate if the presence of a cantilever influences the survival and success of partial fixed implant-supported prostheses, through a systematic review and meta-analysis, with additional analysis of the survival and marginal bone loss rates and prosthesis complications. MATERIALS AND METHODS: The register protocol of the review in the PROSPERO database is CRD42016052008. The MEDLINE and Scopus databases were used for an electronic search of relevant studies up to November 2016, by means of two independent reviewers. The keywords included the combinations "fixed partial denture" with "dental implants", and with "extension" or "cantilever"; and "implant-supported dental prosthesis" with "extension" or "cantilever". The inclusion criteria were randomized clinical trials and prospective and retrospective clinical studies in English that addressed the comparison of success and survival of the use of implant-supported fixed prostheses, with and without cantilevers. Data from the selected studies were used to perform the statistical analysis. RESULTS: Among the 408 articles identified, 4 articles met the eligibility criteria. The presence of a cantilever did not compromise marginal bone loss or the survival of the prostheses. However, minor complications were encountered for the group of partial fixed prostheses without cantilevers, with a statistical difference (P = .008). CONCLUSION: Cantilevers can be used in fixed prostheses and do not interfere negatively in the survival or success of the prosthesis or the marginal bone loss. However, there are minor complications when prostheses without cantilevers, or short cantilevers, are used.


Asunto(s)
Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental/estadística & datos numéricos , Dentadura Parcial Fija , Pérdida de Hueso Alveolar/rehabilitación , Implantación Dental , Implantación Dental Endoósea , Implantes Dentales , Diseño de Prótesis Dental , Diseño de Dentadura , Humanos , Estudios Prospectivos , Estudios Retrospectivos
8.
Rev. Odontol. Araçatuba (Impr.) ; 39(1): 28-32, Jan.-Abr. 2018. tab
Artículo en Portugués | LILACS, BBO - Odontología | ID: biblio-910432

RESUMEN

O objetivo desse trabalho foi avaliar a satisfação e a qualidade de vida de pacientes desdentados que tiveram suas próteses totais mandibulares reembasadas com material resiliente (Ufi Gel SC, VOCO, Alemanha). Foram selecionados 20 pacientes desdentados divididos aleatoriamente nos grupos de reembasamento direto ou indireto (n=10). Foram aplicados dois questionários, o OHIP Edent para avaliar a qualidade de vida e um questionário desenvolvido para verificar a satisfação dos pacientes com o uso do reembasador. Os testes clínicos foram realizados em quatro fases durante o tratamento: inicialmente com as próteses totais sem intervenção, 30, 60 e 90 dias após o reembasamento. A análise de variância ANOVA demonstrou que houve uma diferença estatisticamente significante para o fator tempo tanto para a qualidade de vida como para a satisfação (p d" 0,05). Observamos que a qualidade de visa e a satisfação aumentaram após o reembasamento, mas não houve diferença entre os métodos de polimerização testados. O método de polimerização direto é mais simples, menos demorado e menos oneroso para o paciente. Portanto, se não houver diferença entre os métodos de polimerização a longo prazo, não há porque submeter o paciente ao reembasamento indireto(AU)


The aim of this paper was to assess the quality of life and satisfaction for edentulous individuals who had their complete dentures relined with a soft liner material (Ufi Gel SC, VOCO, Germany). A total of 20 patients were selected and divided into two experimental groups, one for a chairside procedure and one for a laboratorial reline (n=10). Two questionnaires were used, the OHIP Edent and a satisfaction form to assess information on the reline material. The tests were performed initially and at 30, 60 and 90 days after the reline. The analysis of variance ANOVA presented a difference for the period evaluation, the quality of life improved after the procedure, but there was no difference between the polymerization methods. The chairside procedure is more simple, faster and more practical for both, professionals and patients. Therefore, if there are no difference in long term results, there is no reason to the patient undergo the laboratorial reline process(AU)


Asunto(s)
Humanos , Masculino , Femenino , Alineadores Dentales , Dentadura Completa , Calidad de Vida , Boca Edéntula
9.
Araçatuba; s.n; 2018. 63 p. ilus, tab.
Tesis en Portugués | LILACS, BBO - Odontología | ID: biblio-1009562

RESUMEN

Os reembasadores resilientes têm sido amplamente utilizados em pacientes portadores de próteses totais para melhorar a adaptação da base de resina ao rebordo. Esses apresentam dois métodos de polimerização, um feito diretamente na boca do paciente e outro feito indiretamente em laboratório. Não há estudos na literatura que avaliem a percepção dos pacientes com relação a esse tratamento. Portanto o objetivo desse trabalho foi avaliar a satisfação a qualidade de vida, força de mordida e halitose de pacientes desdentados que tiveram suas próteses totais mandibulares reembasadas com material resiliente (Ufi Gel SC, Voco, Alemanha). Foram selecionados 20 pacientes desdentados seguindo critérios de inclusão e exclusão predefinidos para terem suas próteses mandibulares reembasadas. Estes foram divididos aleatoriamente nos grupos de reembasamento direto ou indireto (n=10). Os ensaios clínicos verificaram a qualidade de vida (OHIP Edent), a satisfação com o reembasamento, a força de mordida e também presença e etiologia de halitose. Os testes clínicos foram realizados inicialmente com as próteses totais sem intervenção, após o reembasamento, aos 30, 60, 90 e 180 dias após o reembasamento. A análise de variância ANOVA (significância de 5%) demonstrou que houve uma diferença estatisticamente significante para o fator tempo para todos os testes, mas a técnica de reembasamento não. Observamos que a qualidade de vida, a satisfação, a força de mordida e halitose melhoraram após o reembasamento. A halitose foi influenciada pelo reembasamento e pela higiene bucal dos pacientes. Apesar de não ter demonstrado diferença estatisticamente entre os métodos de polimerização, foi um resultado favorável tanto para o clínico como para o paciente. Portanto, se não houver diferença entre os métodos de polimerização a longo prazo, não há porque submeter o paciente ao reembasamento indireto. Independentemente do método de polimerização escolhido, o reembasamento com material resiliente a base de silicone demonstrou ser uma alternativa viável para melhorar os aspectos funcionais e a satisfação em pacientes que apresentem dificuldades em utilizar próteses totais mandibulares(AU)


Resilient reliners have been widely used for patients wearing complete dentures to improve the adaptation of the base. They present two polymerization methods, one done directly in the patient's mouth and another done indirectly in the laboratory. There are no studies in the literature that assess the perception of patients regarding this treatment. Therefore, the purpose of this paper was to assess, the satisfaction, quality of life of edentulous patients who had their total mandibular prostheses rebased with resilient material (Ufi Gel SC, Voco, Germany). 20 edentulous patients were selected according to predefined inclusion and exclusion criteria. These were randomly divided into the direct or indirect soft reline groups (n = 10). The clinical trial evaluated the quality of life (OHIP Edent), the satisfaction regarding the treatment, the bite force and presence and prevalence of halitosis. The assays were performed in six phases during the treatment: initially with the total prostheses without intervention, after the reline procedure, 30, 60, 90 and 180 days after the reline. The analysis of variance ANOVA (5% significance) demonstrated a statistically significant difference for period in all parameters, but the technique did not influence any of the parameters (P ≤ 0.05). We observed that the QoL, satisfaction, bite force and halitosis increased after the reline. The halitosis was influenced by patients' oral hygiene and the reline procedure. Although it has not demonstrated a statistical difference between polymerization methods, it was a favorable result for both clinicians and patients. The direct polymerization method is simpler, less time consuming and less costly for the patient. Therefore, if there is no long-term difference between polymerization methods, there is no need to perform an indirect procedure. Regardless of the method of polymerization chosen, relining with resilient silicone-based material is a viable alternative to improve the quality of life, satisfaction, bite force and halitosis in patients who have difficulties wearing mandibular dentures(AU)


Asunto(s)
Humanos , Masculino , Femenino , Calidad de Vida , Dentadura Completa , Alineadores Dentales , Fuerza de la Mordida , Polimerizacion , Halitosis
10.
RGO (Porto Alegre) ; 65(3): 243-248, July-Sept. 2017. tab, graf
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-896027

RESUMEN

ABSTRACT Objective The aim of this study was to investigate the subjective aspects related to the perception of dental appearance and expectations of patients who receive dental treatment in graduation clinics of the Araçatuba Dental School. Methods It was evaluated 362 patients of both gender aged over 18. The questionnaire included questions of demographic data, questions to assess facial and dental aesthetics, dental satisfaction and treatments considering patients notion to improve dental esthetics. The data collected was analyzed using descriptive statistics and the chi-square test. Results The factor teeth for facial analysis and factor positioning in the arch for smile analysis were considered the most important subjects regarding the esthetic according to the respondents. 67.5% of patients were dissatisfied with the appearance of their teeth, and dissatisfaction with the color was the most important factor (66.8%). The treatment most desired was tooth whitening and 85.0% of patients said yes to it. Conclusion Respondents place great value on the teeth on the face appearance, and it can be seen that aesthetic treatments are highly valued in all age groups. There is a need for treatments to restore the function, but treatments to improve dental appearance were the most requested.


RESUMO Objetivo Avaliar os aspectos subjetivos relacionados à percepção da aparência dental e expectativas de pacientes que recebem tratamento odontológico nas clínicas de graduação da Faculdade de Odontologia de Araçatuba. Métodos Foram avaliados 362 pacientes de ambos os sexos com idade superior a 18. O questionário incluiu perguntas sobre dados demográficos, perguntas para avaliar a estética facial e dentária, a satisfação dental e tratamentos considerando a noção dos pacientes de melhorar a estética dental. Os dados coletados foram analisados por meio de estatística descritiva e o teste do qui-quadrado. Resultados O fator dentes para análise facial e o fator posicionamento no arco para análise sorriso foram considerados os temas mais importantes a respeito da estética, de acordo com os entrevistados. 67,5% dos pacientes estavam insatisfeitos com a aparência de seus dentes, a insatisfação com a cor foi o fator mais importante (66,8%). O tratamento mais desejado foi o clareamento dental e 85,0% dos pacientes disse sim a ele. Conclusão Os pacientes dão grande valor aos dentes sobre a aparência rosto, e ele pode ser visto que os tratamentos estéticos são altamente valorizados em todos os grupos etários. Há uma necessidade de tratamentos para restabelecer a função, mas os tratamentos para melhorar a aparência dentária foram os mais solicitados.

11.
J Med Eng Technol ; 41(4): 309-313, 2017 May.
Artículo en Inglés | MEDLINE | ID: mdl-28351185

RESUMEN

New systems are released in the odontological market with the objective of bringing improvements and advancements in the clinical success of implants and implant-supported prostheses. The distribution of tension for the bone/implant system of these new systems is important. The purpose of this work was to evaluate, by photoelastic analysis and strain gauges, the distribution of tension for the bone/implant system, using the Slim system. A photoelastic cast with an external hexagon implant was manufactured and a metal prosthesis was screwed below it, with or without the tested system. For the photoelasticity methodology, a photoelastic cast, with or without the tested system, was positioned in a circular polariscope, and axial loads of 100 N were applied to the centre of the crown. The pattern of tension generated was photographed and analysed qualitatively in an imaging programme. For the extensometry methodology, two extensometers were placed in the mesial and distal region of the implant in the photoelastic cast. The axial loads were applied to the group again, with or without the system (n = 10). The t test of independent samples with a significance level of 5% was used for this analysis. This study demonstrated greater tension values for both the photoelastic and extensometry methods when the tested system was used. Clinical studies must be performed to evaluate the tested system because the results might not be clinically significant to a bone reabsorption.


Asunto(s)
Implantes Dentales , Fenómenos Biomecánicos , Humanos , Ensayo de Materiales , Estrés Mecánico
12.
Clin Oral Implants Res ; 28(10): e169-e174, 2017 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-27616640

RESUMEN

OBJECTIVES: The aim of this study was to investigate the outcomes of the installation of two implant-supported overdentures until such treatment is complete. Although this treatment is well established in the literature, there are no studies comparing what happens to muscles and the quality of life (QoL) of patients during the treatment. METHODS: We selected 13 completely edentulous patients, according to inclusion and exclusion criteria, to rehabilitate with mandibular overdentures retained by two dental implants and a complete denture as antagonists. We evaluated the efficacy of the treatment and its evolution in five steps: (i) initially, with the old complete dentures, (ii) after the implants' placement with the mandibular prosthesis relined, (iii) after the placement of the healing abutments, (iv) after the installation and adaptation of new prostheses, and (v) after a 3-month follow-up period. At each stage, we evaluated patients via temporal and masseter electromyography (EMG), molar and incisive bite force, and QoL. RESULTS: The results for EMG found a decrease in muscle activity during rest, the mastication of raisins, and lateral movements when the overdentures were installed. For the bite force and QoL, there was a gradual improvement from the placement of the healing abutments period (P Ë‚ 0.05), which was sustained until the follow-up. CONCLUSIONS: Comfort and stability improved during the treatment, demonstrated by the QoL and bite force results. These results are positive for elderly patients who might refuse an implant-supported overdenture due to treatment length.


Asunto(s)
Fuerza de la Mordida , Prótesis Dental de Soporte Implantado , Prótesis de Recubrimiento , Electromiografía , Músculo Masetero/fisiología , Boca Edéntula/rehabilitación , Boca Edéntula/cirugía , Calidad de Vida , Músculo Temporal/fisiología , Anciano , Femenino , Humanos , Masculino , Mandíbula
13.
J Med Eng Technol ; 41(2): 115-121, 2017 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-27696920

RESUMEN

Short dental implants have been used as an attempt to avoid bone grafts surgery, however there are few literature reports that evaluate changes to their design. Therefore, the aim of this study was to assess the effect of different short implant design on stress distribution through photoelastic analysis. Six external hexagon (5 × 5 mm) short dental implants with different design were used. Each group was treated with a single crown and a three element fixed partial dental prosthesis, resulting in a total of 12 photoelastic models. The assembling photoelastic model-implant-prosthesis was set in a circular polariscope where loads of 100N were applied on the occlusal surface with a Universal Test Machine (UTM). The tension fringes were photographed and later assessed qualitatively by a graphic software (Adobe Photoshop). Less high-intensity fringes were observed on the short implants with triangular threads, short external hexagon and flat apical profile. In conclusion, the macrodesign influenced the amount of stress distributed to the bone when short dental implants are placed.


Asunto(s)
Implantes Dentales , Dentadura Parcial Fija , Estrés Mecánico , Fenómenos Biomecánicos , Humanos , Ensayo de Materiales , Diseño de Prótesis
14.
Mater Sci Eng C Mater Biol Appl ; 71: 755-763, 2017 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-27987770

RESUMEN

The material used for interim prostheses fabrication must present excellent physical properties for greater longevity in the face of environmental conditions, which can occur in the oral cavity. The purpose of this study was to evaluate the effect of a photopolymerized glaze on the physical and mechanical properties of polymers used for the fabrication of interim prostheses, before and after thermocycling and immersion in staining solutions. One hundred samples of composite and acrylic resins were fabricated: Dencor chemically activated acrylic resin (CAAR) (n=20) and heat-polymerized acrylic resin (HPAR) (n=20), Charisma (n=20), Structur (n=20), and Protemp (n=20). A mechanical polishing was performed on half of the samples, and a chemical polishing was performed on the remaining samples. Subsequently, all samples were submitted to thermocycling and immersion in coffee staining solution for 21days. Analysis of color and microhardness, as well as atomic force microscopy (AFM), scanning electron microscopy (SEM), and energy dispersive x-ray spectrometry (EDS) were performed. The data were submitted to repeated-measures analysis of variance (ANOVA), followed by the Tukey test (α=0.05) and the Student t-test (α=0.05). It was verified that the glaze decreased the chromatic alteration values, and increased the microhardness values of the samples, with the exception of the Charisma resin. The samples that did not receive chemical polishing had the greatest number of surface irregularities. This study concluded that the groups with glaze presented less color alteration. In addition, Charisma and Structur resins exhibited the greatest chromatic stability. As to the microhardness, the values were greater when the samples were treated with the glaze, with the exception of the Charisma group.


Asunto(s)
Luz , Polimerizacion , Polímeros/química , Prótesis e Implantes , Análisis de Varianza , Color , Dureza , Microscopía Electrónica de Rastreo , Espectrometría por Rayos X , Propiedades de Superficie
15.
Mater Sci Eng C Mater Biol Appl ; 69: 995-1003, 2016 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-27612795

RESUMEN

The effect of a photopolymerized glaze on different properties of acrylic resin (AR) for ocular prostheses submitted to accelerated aging was investigated. Forty discs were divided into 4 groups: N1 AR without glaze (G1); colorless AR without glaze (G2); N1 AR with glaze (G3); and colorless AR with glaze (G4). All samples were polished with sandpaper (240, 600 and 800-grit). In G1 and G2, a 1200-grit sandpaper was also used. In G3 and G4, samples were coated with MegaSeal glaze. Property analysis of color stability, microhardness, roughness, and surface energy, and assays of atomic force microscopy, scanning electron microscopy, and energy-dispersive spectroscopy were performed before and after the accelerated aging (1008h). Data were submitted to the ANOVA and Tukey Test (p<0.05). Groups with glaze exhibited statistically higher color change and roughness after aging. The surface microhardness significantly decreased in groups with glaze and increased in groups without glaze. The surface energy increased after the aging, independent of the polishing procedure. All groups showed an increase of surface irregularities. Photopolymerized glaze is an inadequate surface treatment for AR for ocular prostheses and it affected the color stability, roughness, and microhardness. The accelerated aging interfered negatively with the properties of resins.


Asunto(s)
Resinas Acrílicas/química , Ojo Artificial , Luz , Polimerizacion , Dureza , Microscopía de Fuerza Atómica , Microscopía Electrónica de Rastreo , Espectrometría por Rayos X , Factores de Tiempo
16.
J Clin Diagn Res ; 10(5): ZC84-7, 2016 May.
Artículo en Inglés | MEDLINE | ID: mdl-27437367

RESUMEN

INTRODUCTION: The use of removable partial denture (RPD) is considered as low-cost and common treatment option to rehabilitate edentulous areas. AIM: This study aimed to investigate the epidemiological data of patients rehabilitated with removable partial denture (RPD) in order to assess treatment survival rate and failures. MATERIALS AND METHODS: Epidemiological data and medical records of patients treated with RPD between 2007 and 2012 at the RPD discipline of a Brazilian University (Aracatuba Dental School- UNESP) were evaluated as well as dental records of patients who underwent RPD treatments (fabrication or repairs) between 2000 and 2010. Factors such as gender, age, presence of systemic disease, main complaint, edentulous arch, period and cause of denture replacement and the prosthesis characteristics were recorded. The chi-square test was used to assess the differences between the variables and the Kaplan Meyer to assess the survival of the RPDs evaluated. RESULTS: A total of 324 maxillary RPD and 432 mandibular RPD were fabricated. Most of the patients were women aging 41 to 60-year-old. The number of mandibular RPD Kennedy class I (26%) was statistically higher for the maxillary arch (p<.05). There was no association between main complaint to gender or the presence of systemic disease. The lingual plate was the most common major connector used in the mandible (32%). The main reason for altering the design of replaced RPDs were changes during treatment plan. CONCLUSION: The number of patients who require RPD is large; most of RPDs are Kennedy Class I. A good treatment plan is very important for achieving a positive treatment outcome, and it is strictly related to the survival rate.

17.
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.

18.
Rev. Odontol. Araçatuba (Impr.) ; 36(1): 70-74, jan.-jun. 2015. tab
Artículo en Portugués | BBO - Odontología | ID: biblio-857011

RESUMEN

A prótese obturadora é uma alternativa para a reabilitação funcional e estética de pacientes que se submeteram a ressecção cirúrgica total ou parcial da maxila. Para a obtenção de maior estabilidade e retenção desta prótese, faz-se necessário a associação de implantes osseointegrados para a maioria dos pacientes. Porém, quando se trata de pacientes com história de câncer de cabeça e pescoço, ainda não há consenso na literatura quanto a essa associação, devido ao envolvimento da radioterapia e/ou quimioterapia durante o tratamento, as quais possuem efeitos secundários como: xerostomia, diminuição do suprimento vascular, dificuldade na abertura de boca e deglutição, e a dificuldade em tolerar a prótese. Contudo, a oxigenoterapia hiperbárica tem sido utilizada como um recurso para melhorar a osseointegração dos implantes, aumentando a oxigenação dos tecidos irradiados. Pode-se verificar que a associação da prótese obturadora com implantes osseointegrados, conjuntamente com a radioterapia e/ou quimioterapia, resultaram em melhora na qualidade de vida da maioria dos pacientes estudados


The obturator prosthesis is an alternative for functional and esthetic rehabilitation of patients who have been submitted total or partial surgical resection of the jaw. To obtain increased stability and retention of this prosthesis, osseointegrated implants are due for most patients. However, when dealing with patients with head and neck cancer history, there is no consensus in the literature about this association due to the involvement of radiotherapy and / or chemotherapy during treatment, which have side effects such as: dry mouth, decreased vascular supply, difficulty of mouth opening and swallowing, and difficulty tolerating the prosthesis. Although, the hyperbaric oxygen therapy has been used as a resource to improve osseointegration of the implants, increasing the oxygenation of the irradiated tissues. It was shown that the combination of obturator prosthesis with osseointegrated implants in conjunction with radiotherapy and / or chemotherapy, resulted in improved quality of life for most patients


Asunto(s)
Implantes Dentales , Oseointegración , Prótesis Maxilofacial , Quimioterapia , Radioterapia , Rehabilitación Bucal
19.
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.

20.
Araçatuba; s.n; 2015. 80 p. ilus, tab.
Tesis en Portugués | LILACS, BBO - Odontología | ID: biblio-870093

RESUMEN

Apesar dos avanços da odontologia preventiva mundial, o número de indivíduos desdentados ainda é grande. Muitos pacientes têm dificuldades na utilização das próteses totais convencionais, principalmente, as mandibulares. Uma alternativa de tratamento nessas situações é a instalação de overdentures implanto suportadas. Esse tratamento já é bem estabelecido na literatura, mas ainda não há estudos que comparem o que ocorre com a atividade elétrica, força de mordida e qualidade de vida dos pacientes até o momento da adaptação com as novas dentaduras. Avaliamos a eficiência do tratamento bem como sua evolução em cinco etapas distintas, com as próteses totais antigas (I), após a cirurgia de instalação dos implantes com as próteses mandibulares reembasadas (II), após a instalação dos cicatrizadores (III), no momento da instalação das novas próteses (IV) e após três meses de uso (V). Foram selecionados 12 pacientes completamente desdentados, de acordo com critérios de inclusão e exclusão preestabelecidos, para a instalação de overdentures retidas por dois implantes mandibulares e próteses totais maxilares como antagonistas. Em cada etapa avaliamos os pacientes por meio da eletromiografia de temporal e masseter, da força de mordida e também aplicamos o questionário OHIP edent para avaliar a qualidade de vida desses pacientes. Nos resultados encontramos uma diminuição da atividade elétrica para a mastigação habitual de uvas passas, repouso e movimento de lateralidade, a força de mordida e a qualidade de vida dos pacientes aumentaram progressivamente durante o estudo (p ˂ 0,05). Comprovando que essa reabilitação deveria se tornar padrão para indivíduos desdentados e que seus benefícios já são observados antes mesmo de sua completude.


Despite advances in preventive dentistry in Brazil, the number of edentulous individuals is still great. Many patients present difficulty when using conventional dentures, especially towards the mandibular one. A treatment option for these situations is the installation of implant-retained prostheses. Although this treatment is well established in the literature, there are no studies comparing what happens to muscles and quality of life of patients during the treatment. We selected 12 completely edentulous patients, according to pre-established inclusion and exclusion criteria, to rehabilitate with mandibular overdentures retained by two dental implants and a complete denture as antagonists. We evaluated the efficacy of the treatment and its evolution in five distinct steps, initially with the old complete dentures (I) after the implants placement with the mandibular prosthesis relined (II) after the placement on of the healing abutments (III), after the installation and adaptation of new prostheses (IV) and after three months of its use (V). At each stage, we evaluated patients through the temporal and masseter electromyography (EMG), bite force and the questionnaire OHIP Edent to assess the quality of life of these patients. The results for EMG found a decrease in muscle activity during the mastication of raisins, rest and lateral movements, while the bite force and the quality of life of patients gradually improved during the study (p ˂ 0.05). Proving that this rehabilitation should become standard for edentulous individuals and that the benefits of treatment are observed even before its completion.


Asunto(s)
Humanos , Masculino , Femenino , Anciano , Anciano de 80 o más Años , Implantes Dentales , Dentadura Completa , Electromiografía , Músculo Masetero , Calidad de Vida , Músculo Temporal
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...