Uso de prótesis parcial removible con resina acrílica termoplástica: una revisión de literatura

La prótesis parcial removible (PPR) es una alternativa de tratamiento en pacientes que perdieron algunos elementos dentarios, debido al costo relativamente bajo y a la generación de una función masticatoria satisfactoria. Además, es una buena opción cuando hay pérdida de los tejidos óseos, dado que impide la instalación de implantes dentarios. La PPR convencional presenta una estructura metálica que ofrece retención y resistencia a la prótesis, convirtiéndola en poco agradable a los pacientes, por el hecho de dejar a la vista el metal en la cavidad oral. A partir de investigadores que decidieron ir más allá del simple estudio de la función y la estética de las PPR para adentrase en sus diversas formas de presentación, surgió la prótesis parcial flexible (PFlex). La PFlex es una prótesis parcial confeccionada con resina termoplástica, sin metal y con flexibilidad. Si bien, muchos profesionales la emplean como prótesis temporal, otros tantos la han usado como alternativa a la PPR convencional. Así, uno de los frecuentes interrogantes de los clínicos es si realmente es posible utilizar la PFlex como alternativa protética definitiva. Por tanto, el propósito de este trabajo fue realizar una revisión de la literatura para evaluar si el uso de prótesis parciales removibles con resina termoplástica puede ser una alternativa a las prótesis parciales convencionales, exponiendo las ventajas, desventajas, indicaciones, contraindicaciones y las propiedades del material protético.

Removable partial denture (RPP) is an alternative treatment when it comes to patients who have lost some dental elements, as they have the advantages of a relatively low cost and a satisfactory masticatory function. Furthermore, it is a good option when there is bone tissue loss, making dental implants placement unfeasible. Conventional PPR has a metallic frame that provides retention and resistance to the prosthesis, which makes it unpalatable to patients because it leaves the metal in the oral cavity evident. Many researchers, aiming to give back beyond function and aesthetics, are studying forms of presentation of PPR, thus emerging the flexible partial prosthesis (PFlex). PFlex is a partial denture made with thermoplastic, resin metal-free and with flexibility, however its use, for many professionals, is limited only as temporary prostheses, but there are some clinicians who use PFlex as an alternative to conventional PPR. Thus, one of the questions constantly asked by scientists is whether it is possible to use PFlex as a definitive prosthetic alternative. Therefore, the aim of this study was to conduct a literature review to assess whether the use of removable partial dentures with thermoplastic resin can be an alternative to conventional partial dentures, exposing the advantages, disadvantages, indications, contraindications, and the properties of the prosthetic material.

Bibliometric Analysis of Removable Partial Denture-related Research in Dentistry

@#The objective of this study was to characterise articles published in removable partial denture (RPD) research from 1948 to 2022 to identify the most influential journals, publications, authors, and core research areas using bibliometric analysis. The Scopus database was used to retrieve publications with titles containing the truncated search term (“removable partial denture*” OR “removable prostho*”). Data analysis and visualisation were done using Microsoft Excel, Biblioshiny software and VOSviewer. A total of 2,484 articles were analyses from 1948 till 2022, representing an annual growth rate of 4.9%. The Journal of Prosthodontic Research demonstrated the highest average normal citation rate, with productive authors with highest citations being from Japan. From 1948 to 1999, most in-vitro and clinical research focused on the basic concept of RPD using cobalt-chromium as a framework before shifting to titanium in 2000. RPD research after 2012 focuses on new technology and non-metalbased frameworks as an alternative to metal-based frameworks. Wakabayashi and Fueki were the most prominent researchers, according to a three-field plot analysis, with the Journal of Prosthetic Dentistry, Journal of Oral Rehabilitation, and Journal of Prosthodontic Research among the authors’ preferred journals. “CAD/CAM” and “3D printing” were identified as emerging themes in year 2020 to 2022, while “selective laser melting” was the trending keyword in 2017 to 2019. Research on “oral health and quality of life” has been identified as core research area in RPD-related research. RPD research on digital dentistry and new framework materials is anticipated to increase in the future with the incorporation of research on quality of life.

Audit to assess the quality of 916 prosthetic prescriptions of removable partial dentures / 华西口腔医学杂志

OBJECTIVES@#The objectives of this study were to assess the quality of prosthetic prescriptions of removable partial dentures (RPDs) and to analyze the current situation of the communication and information delivery between clinicians and technicians.@*METHODS@#All RPD prosthetic prescriptions received by a major dental laboratory in 4 weeks were involved in a quality audit, and the prescriptions were divided into three groups in accordance with the grades of clients. The filling of prosthetic prescriptions was recorded. The items in the prescriptions for audit included the general information of the patient, the general information of the clinician, the design diagram information, other detailed information, and the return date. The prescriptions were categorized into four levels on the basis of their quality by two quality inspectors who have been working for more than 10 years.@*RESULTS@#A total of 916 prescriptions were collected and assessed. The names in the general information of the patient and the clinician were filled out best, both at the rate of 97.6% (n=894). The return date was filled out worst, only at the rate of 6.4% (n=59). Of those prescriptions, 86.8% (n=795) exhibited inadequate design diagram information. The results of the quality assessment demonstrated that 74.2% of prescriptions were assessed as noncompliant ones and failed to meet the acceptable clinical quality standard.@*CONCLUSIONS@#At present, the overall quality of RPD prosthetic prescriptions is poor. The responsibilities of clinicians and technicians are unclear, and the communication between them is not ideal.

Aesthetic rehabilitation of the severe bone loss on anterior region using Andrew’s Bridge: A case report

@#A patient with several missing teeth in the anterior region usually experiences severe hard and soft tissue loss, posing a greater challenge for the prosthodontist to treat. This is a case of a 50-year-old female patient who came to the RSGMP UNAIR department of prosthodontics needing to replace the old denture that felt loose and had a change of color to rehabilitate the loss of large residual ridges involving hard and soft tissue. The patient has lost the central and lateral right maxillary incisors with severe hard and soft tissue defect after cyst removal in the region. The patient considered to restore an anterior region with severe hard and tissue loss. Andrew’s Bridge successfully restores an anterior region with severe hard and soft tissue loss.

Familial gigantiform cementoma with Ehlers - Danlos syndrome: A report of 2 cases

Ehlers-Danlos syndrome is an autosomal dominant hereditary disorder of connective tissue, while familial gigantiform cementoma is a condition that usually manifests as multiple radiopaque cementum-like masses throughout the jaws. This case report discusses the oral management and prosthetic rehabilitation of two patients presenting familial gigantiform cementoma with Ehlers-Danlos Syndrome.

Familial gigantiform cementoma with Ehlers - Danlos syndrome: A report of 2 cases

Ehlers-Danlos syndrome is an autosomal dominant hereditary disorder of connective tissue, while familial gigantiform cementoma is a condition that usually manifests as multiple radiopaque cementum-like masses throughout the jaws. This case report discusses the oral management and prosthetic rehabilitation of two patients presenting familial gigantiform cementoma with Ehlers-Danlos Syndrome.

Prótesis Parcial Removible con Extensión Distal y Apoyo sobre Implantes, Comportamiento y Consideraciones Clínicas / Removable Partial Denture with Distal Extension and Implant Support, Behavior and Clinical Consideration

La rehabilitación de los extremos libres, en mandíbula uni o bilaterales, suponen un gran reto para el odontólogo, siendo un problema a resolver en la práctica clínica habitual. Tales casos suelen ser resueltos mediante prótesis parcial removible, las cuales deben soportar fuerzas horizontales y de torsión, con efectos adversos durante la función, al producir fuerzas terminales de torque contra pilares y tejidos blandos principalmente por la diferente resiliencia de estas estructuras afectando así la retención, estabilidad y el soporte de la prótesis dental. En el último tiempo se han reportado prótesis parcial removible mandibular en combinación con implante en extremo libre distal como una alternativa a las tradicionales prótesis parcial removible mucodentosoportada y a las prótesis fijas implantosoportadas para el manejo de la desdentición parcial en extremo libre; sin embargo, los reportes publicados en la literatura sobre esta alternativa es limitada respecto a la funcionalidad y el pronóstico. Este artículo presenta una revisión sistematizada de la literatura cuyo objetivo fue identificar y sintetizar la mejor evidencia disponible respecto a las consideraciones y comportamiento clínico de esta modalidad de tratamiento en desdentados de la clase I y II de Kennedy mandibular.

The rehabilitation of free ends in a unilateral or bilateral jaw represents a major challenge for the dentist, and is a problem to solve in the daily clinical practice. These cases are usually resolved by removable partial dentures, which should be able to withstand horizontal forces. Torque adverse effect can occur during functioning, because of torque forces terminals against pillars and soft tissue mainly caused by the different resilience of these structures, therefore affecting retention, stability and support of the dental prosthesis. In recent times it has been reported that mandibular removable partial dentures in combination with distal free end implants can be a viable alternative to traditional removable partial dentures and implant-supported fixed partial dentures for treatment of partial toothless free end, however literature regarding functionality and prognosis of this alternative is limited. This paper presents a systematic literature review aimed to identify and synthesize the best available evidence regarding the considerations and clinical behavior of this treatment modality in edentulous Class I and II of the edentulous Kennedy mandibular.

Necesidades protésicas de la población de Rio Chico Edo. Miranda: agosto-noviembre 2010 / Prosthetic needs in population of Río Chico Edo. Miranda agust-november 2010

La pérdida parcial o total de la dentición natural es el resultado más frecuente de caries dental o enfermedad periodontal. Estos, ocasionan la extracción temprana de las piezas dentarias permanentes trayendo como consecuencia la necesidad de rehabilitación al individuo afectado. Determinar las necesidades protésicas de los pacientes de la población de Río Chico-Edo. Miranda. Estudio descriptivo y transversal. El instrumento de recolección de datos fue la Historia Clínica empleada por ambos centros, se estudiaron 701 pacientes entre masculinos y femeninos que acudieron a solicitar tratamiento odontológico al ambulatorio urbano tipo III Centro de Especiales Médico Odontológicas (C.E.M.O.) y el ambulatorio urbano tipo II Asociación Damas Salesianas (ADS) durante el período agosto-noviembre 2010. Se elaboró una matriz de datos en el programa Excel para la organización de los datos. 72% de la muestra eran mujeres y 28% eran hombres. La edad más afectada fue entre 21 y 30 años (28%). De acuerdo a las necesidades protésicas el 71% requiere una o más prótesis fija, 26% requerían prótesis parciales removibles tanto dento-soportadas como dento-muco-soportadas y 3% requería de prótesis totales. Se ratifica la importancia de este estudio para proveer información a las entidades del Estado encargados de brindar los recursos para rehabilitar a nivel bucal a esta población.

The partial or complete loss of the natural dentition is the most frequent result of dental caries or periodontal disease. There from the early extraction of teeth permanent bringing as a result the need for rehabilitation tothose affected individual. To determine the population of Río Chico- Miranda State, Venezuela, patients prosthetic needs. descriptive and transversal study. The data collection instrument was the clinical history, used by bothenters, 701 patients of both sexes who came to seek dental treatment to urban ambulatory type III special medical dental (C.E.M.O.) Centre and urban ambulatory type II partnership Damas Salesianas (ADS) during the period August-November 2010. Developed an array of data inthe Excel program for the Organization of the data 72% 28% to the masculine and feminine gender. The most affected age was between 21 and 30 years (28%). Needs prosthetic : 71% requires one or more fixed prosthesis, 26% require removable dento-supported both dento-muco-supported partial dentures and dentures requires 3%. Confirms the importance of this study to provide information to State entities responsible for providing resources to rehabilitate oral level to this population.

Manejo de impresiones en prótesis parciales removibles en la práctica odontológica en tres laboratorios dentales / Management wrapped removable partial dentures in dental practice dental laboratories in three

Se estudió el manejo de impresiones en prótesis parciales removibles en la práctica odontológica a través del análisis de los patrones de frecuencias en relación a la clasificación de Kennedy, tipos de impresión, técnica utilizada, material de impresión y forma de envío; para tal fin se realizaron encuestas en tres laboratorios de la ciudad de Caracas, Venezuela. Se evidenció que en la práctica privada existe una falla en el manejo impresiones enviadas al laboratorio; el tipo de impresión enviada con mayor frecuencia es la anatómica aún en casos a extensión distal. Finalmente, se ratifica la importancia de estudios de este tipo de impresiones para proveer información a los programas de pregrado, postgrado y educación continua...

Impression techniques in removable partial dentures in private practice were studied. The frequency patterns related to Kennedy classification, types of impression, techniques, impression materials and referral form to laboratory technicians were analyzed. The results showed a poor handling of impression procedures. Anatomical impression was the most often impression sent even in distal extension cases. Finally, it confirms the importance of such studies to provide information to undergraduate programs, graduate and continuing education...

Impacto de las prótesis removibles en la posición lingual, patrón de deglución y calibre sagital de la vía aérea orofaríngea / The impact of removable prosthesis on the position of the tongue during resting and swallowing states, and on the sagittal size of the oropharyngeal airway

Introducción: las prótesis dentales removibles y su influencia en las praxis linguales, no han sido analizadas clínica y radiográficamente. El objetivo fue determinar si las prótesis removibles causan modificaciones clínicas en la posición lingual y en el patrón de deglución; y cambios radiográficos en el calibre sagital de la vía aérea orofaríngea en pacientes con pérdida de mesa molar. Métodos: mediante un diseño preexperimental preprueba posprueba en un solo grupo, se evaluaron 15 pacientes en tres tiempos distintos: pretratamiento (T1), inmediatamente al insertar las prótesis (T2) y a los 6 meses posteriores (T3). La posición lingual se evaluó según Kotsiomiti. El patrón de deglución se evaluó según Bossart. Se hizo el análisis cefalométrico basado en Delaire y Argandoña para medir la vía área orofaríngea. Los datos clínicos fueron analizados estadísticamente con la prueba de Friedman, para la cefalometría se usó el análisis de varianza (ANOVA) y la prueba de Duncan. (p > 0,05) Resultados: se encontraron diferencias altamente significativas en la posición lingual, variando desde la posición anormal superior a la normal inferior. En el patrón de deglución se encontraron diferencias significativas, variando del linguo-mandibular al linguo-dentario. El calibre sagital de la vía aérea orofaríngea disminuyó significativamente entre T1 y T2. Conclusiones: línicamente ocurren cambios positivos en la posición lingual en reposo y en el patrón de deglución. Los cambios negativos que ocurren en la vía aérea orofaríngea al insertar las prótesis tienden a revertirse a los 6 meses de uso, producto de la acomodación estructural y funcional del macizo lingual.

Introduction: removable dentures and their influence on lingual position have not been clinically and radiographically tested. The objective of this study was to determine whether dentures cause clinical changes in tongue position and swallowing patterns, as well as radiographic changes in the sagittal caliber of the oropharyngeal airway in patients with molar table loss. Methods: by means of a pretest-posttest preexperimental design in a single group, 15 patients were evaluated at three different times: pretreatment (T1), immediately after inserting the prosthesis (T2) and 6 months afterwards (T3). Lingual position was evaluated according to Kotsiomiti. Swallowing patterns were assessed according to Bossart. The cephalometric analysis by Delaire and Argandoña was conducted in order to measure the oropharyngeal airway. The clinical data were statistically analyzed by using the Friedman test, and for cephalometry both the variance analysis test (ANOVA) and Duncan test were used (p > 0.05). Results: highly significant differences were found in tongue position, ranging from upper abnormal position to lower normal position. In terms of swallowing pattern, significant differences were found, ranging from lingual-mandibular to lingual-dental. The sagittal caliber of oropharyngeal airway significantly decreased between T1 and T2. Conclusions: clinically, positive changes occur in tongue position at rest and in swallowing pattern. Negative changes in the oropharyngeal airway after inserting dentures tend to revert within 6 months of use as a consequence of the structural and functional accommodation of the tongue mass.

Evaluación de la condición periodontal en individuos tratados con prótesis parciales removibles y su relación con el diseño aplicado / Assessment of periodontal status in individuals treated with removable partial dentures and its relationship to the applied design

El propósito de este estudio fue determinar la condición periodontal de individuos tratados con Prótesis Parcial Removible (PPR) y su relación con el diseño empleado. Metodología: La población estudiada consistió en 34 individuos rehabilitados con PPR en el pregrado de la Facultad de Odontología de la UCV que aceptaron ser evaluados de acuerdo a Consentimiento Informado aprobado por la Comisión de Bioética de la Facultad de Odontología y que su plan de tratamiento incluía la instalación de una PPR Clase I o II de Kennedy mandibular. Los parámetros periodontales evaluados en los dientes pilares y no pilares fueron: Índice de Placa (IP), Índice Gingival (IG), profundidad de surco gingival (PSG) (promedio en mm) y movilidad dental con el método Periotest (VPT). En relación al diseño se consideró el tipo de retenedor directo y conector mayor empleado. Las variables, fueron comparadas aplicando la prueba de Chi-cuadrado, considerando un nivel de significancia de p < 0,05. Resultados: El IP, PSG y VPT de los dientes pilares fueron mayores a lo observado en los dientes no pilares con diferencias estadísticamente significativas. Conclusiones: La condición periodontal según los parámetros observados no es la ideal y los dientes pilares tienen un grado de afectación mayor; la aplicación del retenedor combinado colado-forjado está supeditada a la condición periodontal observada, mientras que la condición periodontal parece no haber influenciado la selección del conector mayor

Periodontal condition evaluation of individuals treated with removable partial dentures and association to prosthesis design.The purpose of this study was to analyze the periodontal condition of individuals treated with removable partial dentures (RPD) and the relationship with prosthesis design. Methodology: 34 individuals rehabilitated with RPD, by undergraduate dental students, were included in the study after approval of ethical consent. As inclusion criteria, all RPD consisted in mandibular Class I or II of Kennedy. Periodontal parameters evaluated in abutment and non-abutment teeth were as follow: Plaque index (PI), gingival index (GI), depth of gingival sulcus (DGS) (mean of values expressed in mm) and tooth mobility using the Periotest method (VPT). Regarding to prosthesis design, type of major connector and direct retainer were considered. Variables were compared using Chi2 test, and p values <0,05 were considered statistically significant. Results: PI, DGS and VPT in abutment teeth were higher tham non abutment teeth and this values were statistical difference. Conclusions: periodontal status analyzed by parameters is not ideal, and abutment teeth are more affected, the use of wire wrought clasp is related with periodontal status. Additionally, selection of major connector in the design was not influence by periodontal status

Masticatory muscle activity evaluation by electromyography in removable partial denture users / Avaliação da atividade dos músculos da mastigação por eletromiografia em usuários de prótese parcial removível

Objectives: The aim of this study was to evaluate by electromyography the activity of the temporalis and masseter muscles in removable partial dentures (RPDs) users, before and after new RPDs installation. Material and Methods: Ten patients were selected for this study. All subjects were edentulous in the posterior mandibular region (Kennedy class I or II), fully dentate in the antagonist arch, and dental prosthesis users, which needed to be replaced. The electromyographic activity (EMG) recorded the superficial masseter and temporalis muscles, during the maximum voluntary bite force and the rest position. Maximum mouth opening was also verified. The measurements were recorded at four specific times: using the old prosthesis (T0), right after the new prosthesis installation (T1), two weeks (T2) and four weeks (T4) after installing the new prosthesis. All the RPDs were made by an experienced dentist and the same laboratory. Data were statistically analyzed by ANOVA and Tukey tests (α = 0.05). Results: EMG values had high standard deviation at the time T0. Generally, the mean values decreased after new prosthesis installation, especially after two weeks from the installation (T2). During the rest position, the left masseter and left temporalis muscles showed statistically significant gradual decrease in their activities over time. Conclusion: New prostheses have positive effect on the patient’s muscular activity. However, an adaptation period of the muscle fibers to the new prosthesis is needed

Objetivo: O objetivo deste estudo foi avaliar, através de eletromiografia, a atividade dos músculos masseter e temporal em usuários de próteses parciais removíveis (PPR), antes e depois da instalação da nova prótese. Materiais e Métodos: Dez pacientes foram selecionados para este estudo. Todos os indivíduos eram edêntulos na região mandibular posterior (Classes I e II de Kennedy), totalmente dentados no arco antagonista, e usuários de próteses removíveis, com necessidade de substituição. A atividade eletromiográfica (EMG) dos músculos masseter superficial e temporal foi verificada, durante as posições de contração máxima voluntária e repouso. A abertura bucal máxima também foi mensurada. As mensurações foram efetuadas em quatro momentos: durante a utilização da prótese antiga (T0), logo após a instalação da nova prótese (T1), duas semanas (T2) e quatro semanas (T4) após a instalação da nova prótese. Todas as próteses foram fabricadas por um único dentista com experiência e no mesmo laboratório. Os dados foram analisados estatisticamente pelos testes de ANOVA e Tukey (α = 0,05). Resultados: Os valores de EMG tiveram um alto desvio padrão no momento T0. Em geral, a atividade dos músculos mastigatórios sofreu uma diminuição após a instalação da prótese, especialmente após duas semanas da instalação (T2). Durante a posição de repouso, os músculos masseter e temporal esquerdos demonstraram um decréscimo gradual estatisticamente significativo em suas atividades ao longo do tempo. Conclusão: Novas próteses desempenham efeito positivo sobre a atividade muscular dos pacientes. Ainda, um período de adaptação das fibras musculares com a nova prótese se faz necessário.

Reestablishment of occlusion through overlay removable partial dentures: a case report

Loss of posterior teeth may cause an imbalance in the stomatognathic system. Overlay removable partial dentures (ORPD) are a reversible and relatively inexpensive treatment for patients with severely worn teeth. This paper presents a treatment with ORPD in a 55-year-old male patient who had severe attrition in the maxillary and mandibular teeth, temporomandibular joint pain and reduced vertical dimension of occlusion (VDO). The treatment consisted in the reestablishment of the VDO using Lucia’s jig, fabricating removable partial denture with reconstruction of the worn teeth without preparation. This therapy can be used as an alternative treatment to provide esthetic, function and stable occlusion in patients with severely worn teeth.

A perda de dentes posteriores pode provocar o desequilíbrio do sistema estomatognático. As próteses parciais removíveis terapêuticas atuam como terapia reversível e não dispendiosa para os pacientes com desgastes dentais severos. Este trabalho apresenta um tratamento com as próteses parciais removíveis terapêuticas (overlay) em um paciente de 55 anos, do gênero masculino que apresentava atrição severa nos dentes superiores e inferiores, dor na articulação temporomandibular e dimensão vertical de oclusão reduzida. O tratamento consistiu em restabelecer a dimensão vertical de oclusão utilizando o Jig de Lucia, próteses parciais removíveis com reconstrução dos dentes desgastados e sem preparos. Esta terapia pode ser utilizada como uma alternativa de tratamento para a obtenção de estética, função e estabilidade oclusal em pacientes com desgastes dentais severos.

Aceptación clínica de dentaduras paraciales removibles en sujetos tratados con la facultad de odontología de la universidad central de venezuela / Clinical acceptance of removable partial dentures in subjects treated in the faculty of dentistry at the Central University of Venezuela

Se realizó un estudio descriptivo de corte transversal con la finalidad de analizar la aceptación clínica de DPR a extensión distal instaladas en 84 sujetos tratados en la Facultad de Odontología de la UCV que admiten ser evaluados de acuerdo a consentimiento informado; los parámetros evaluados son los establecidos en los "Principios, Conceptos y Práctica en Prostodoncia 1994" de la Academia Americana de Prostodoncia. Los porcentajes de menor aceptación están en los parámetros de evaluación del soporte y retención; el 25% de los sujetos presentaron como aceptables los ocho parámetros evaluados y 17% de los casos cumplen con 4 o menos de los parámetros evaluados

A descriptive study of cross section was conducted with the purpose of analyzing the clinical acceptance of installed distal extension DPR in 84 subjects treated at the Faculty of Dentistry of the UCV. These subjects admitted to be evaluated according to an informed consent; the evaluated parameters are the ones established in the "Principles, Concepts and Practice in Prosthodontics 1994" by the American Academy of Prosthdontics. The percentage of lower acceptance are in the parameters of evaluation of the support and retention; 25% of the subjects displayed as acceptable the eight evaluated parameters and 17% of the cases just fulfill with 4 or less of the evaluated parameters

Alternativas de restauraciones empleadas en la preparación de dientes pilares de prótesis parciales removibles y su frecuencia en pacientes tratados en la Facultad de Odontología de la Universidad Central de Venezuela en el 2008 / Alternatives restorations used in the preparation of abutment teeth of removable partial dentures and their frequency in patients treated at the Facultad de Odontología at the Universidad Central de Venezuela in 2008

En este estudio se analizaron las superficies en el área de soporte y retención en la preparación de los dientes pilares de prótesis parciales removibles inferiores a extensión distal en pacientes atendidos en la Facultad de Odontología de la Universidad Central de Venezuela en el 2008. Para esto se realizaron evaluaciones clínicas a 81 pacientes, previo consentimiento informado, para evidenciar el uso de materiales de restauración y la integridad de los tejidos dentales en estas superficies. Los datos obtenidos fueron registrados en tablas diseñadas para tal fin y los resultados mostraron que las superficies dentarias en el área de soporte y retención fueron preparadas en esmalte, dentina, materiales de restauración y en interfase diente restauración en porcentajes variables, además de registrar la frecuencia de los dientes inferiores empleados como pilares de prótesis parciales removibles a extensión distal y el empleo de retenedores indicados para tales casos

This study analyzed the lower distal extension removable partial denture's abutment teeth rest seats and retention surfaces in patients treated at the Faculty of Dentistry, Universidad Central de Venezuela in 2008. These clinical evaluations were performed to 81 patients, previous informed consent, to show the use of restorative materials and the integrity of dental tissues in these areas. The data were recorded in tables designed for this purpose and the results showed that the tooth surfaces in the area of support and retention were prepared in enamel, dentin, restorative materials and tooth restoration interface in varying percentages, as well as record the frequency lower teeth used as abutments for removable partial dentures with distal extension and the use of retainers suitable for such cases

Comparative study of two commercially pure titanium casting methods

The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies evaluating the effects of casting methods on clasp behavior. OBJECTIVE: This study compared the occurrence of porosities and the retentive force of commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial denture circumferential clasps cast by induction/centrifugation and plasma/vacuum-pressure. MATERIAL AND METHODS: 72 frameworks were cast from CP Ti (n=36) and Co-Cr alloy (n=36; control group). For each material, 18 frameworks were casted by electromagnetic induction and injected by centrifugation, whereas the other 18 were casted by plasma and injected by vacuum-pressure. For each casting method, three subgroups (n=6) were formed: 0.25 mm, 0.50 mm, and 0.75 mm undercuts. The specimens were radiographed and subjected to an insertion/removal test simulating 5 years of framework use. Data were analyzed by ANOVA and Tukey's to compare materials and cast methods (α=0.05). RESULTS: Three of 18 specimens of the induction/centrifugation group and 9 of 18 specimens of plasma/vacuum-pressure cast presented porosities, but only 1 and 7 specimens, respectively, were rejected for simulation test. For Co-Cr alloy, no defects were found. Comparing the casting methods, statistically significant differences (p<0.05) were observed only for the Co-Cr alloy with 0.25 mm and 0.50 mm undercuts. Significant differences were found for the 0.25 mm and 0.75 mm undercuts dependent on the material used. For the 0.50 mm undercut, significant differences were found when the materials were induction casted. CONCLUSION: Although both casting methods produced satisfactory CP Ti RPD frameworks, the occurrence of porosities was greater in the plasma/vacuum-pressure than in the induction/centrifugation method, the latter resulting in higher clasp rigidity, generating higher retention force values.

Aplicación del método periotest en prostodoncia parcial removible: revisión de la literatura / Application of the method periotest removable partial prosthodontics: a literature review

El método periotest es un parámetro cuantitativo reproducible de la reacción del periodonto a estímulos de percusión, está medida es un parámetro biofísico basado en una escala numérica de -8 a +50. El Periotest por si mismo no es una herramienta de diagnóstico, sin embargo, su empleo en evaluaciones sucesivas genera información precisa y objetiva de la evolución del caso ante la aplicación de tratamientos en diferentes áreas de la odontología

The periotest method is a reproducible quantitative parameter of the reaction of periodonto to percussion stimuli, this measurement is a biophysic parameter based on a representative fraction from -8 to +50. The Periotest to per itself is not a diagnosis tool, nevertheless, its use in successive evaluations generates precise and objective information of the evolution of the case before the application of treatments in different areas from dentistry

Avaliação in vitro de três condicionadores de tecido, submetidos a testes de penetração / In vitro evaluation of three temporary tissue conditioners, submitted to penetration tests

Introdução e Objetivo: O objetivo do estudo foi avaliar a existência de alterações na resiliência de quatro diferentes condicionadores de tecido: Coe Comfort (CC), Ufi-Gel (UG), Sofreliner S (SS) e Sofreliner MS (SMS), associados aos seus respectivos selantes de superfície em diferentes intervalos de tempo. Material e Método: Foram confeccionadas 160 cápsulas de resina acrílica que, após seu acabamento, foram preenchidas com os condicionadores de tecidos. Para o Grupo CC, não houve tratamento da superfície interna das cápsulas, sendo o material preparado conforme as indicações do fabricante e acomodado nas cápsulas e para os condicionadores de tecido UG, SS e SMS realizou-se o tratamento interno das cápsulas. Após a obtenção dos corpos de prova, estes foram submetidos a testes de penetração, os testes foram realizados nos intervalos de 1h, 24hs, 30, 60 dias. Resultados: Avaliou-se o efeito do fator tempo na resiliência destes materiais e foi observado que o CC foi o condicionador que mais perdeu essa característica com o passar do tempo, comprovando que seu uso está limitado apenas por curto período. Já os condicionadores UG, SS e SMS, apesar de terem uma pequena deficiência na resiliência na primeira hora, demonstraram-se mais estáveis após todos os testes ao final de 60 dias. Conclusão: Condicionadores de tecidos a base de silicona permanecem com as características iniciais por até 60 dias, enquanto condicionadores de tecido a base de resina acrílica perdem progressivamente sua viscoelasticidade.

Introduction and Objective: The aim of this study was to evaluate resilience changes of four tissue conditioners: Coe Comfort (CC), Ufi-Gel (UG), Sofreliner S (SS) and Sofreliner MS (SMS), associated to their respective surface sealers at different times. Material and Method: 160 capsules of acrylic resin were made and then finished prior to the filling with the tissue conditioners. For the CC group the capsules were not treated and were filled with the material. For the conditioners UG, SS and SMS, the capsules were internally treated prior to the material insertion. All the materials were used following the manufacturer?s instructions. The test were carried out after 1h, 24h, 30 days and 60 days. Results: The effect of time at the materials resilience was evaluated and observed that CC loses more resilience than UG, SS and SMS what proofs his use in a short period. UG, SS and SMS despite bad results in a first moment, shows better results after 60 days. Conclusion: Were concluded that silicon based materials are more stable than acrylic resin based materials.

Stress analysis of distal-extension removable partial dentures supported by mini implants / 上海交通大学学报（医学版）

Objective To analyse the stress distribution of distal-extension removable partial dentures supported by mini implants. Methods The finite element analysis models of conventional removable partial dentures ( CRPD) and mini implants supported removable partial dentures (ISRPD) were established by modular denture model. The stress distribution of abutments and supporting tissues was compared by finite element analysis software Abaqus 6.5.Results Under vertical loading, the stress of abutment teeth, mucosa of edentulous region and alveolar bone of ISRPD model was lower than that of CRPD model. Under oblique loading, the stress of each part of CRPD model and alveolar bone of ISRPD model significantly increased, while that of abutment teeth and parodontium of ISPRD model decreased. Conclusion The distal-extension removable partial dentures supported by mini implants work well in protecting the abutments and supporting tissues.

Valplast(R) flexible removable partial denture for a patient with medically compromised conditions: a clinical report / 대한치과보철학회지

STATEMENT OF PROBLEM: As the number of elders is growing with the advancement of medicine, partially or fully edentulous patients have increased. Medically compromised conditions are common in the older population so that it should be taken into account in prosthetic treatment planning as well as their economic conditions. In the older patients, removable prosthesis has been preferred to implant prosthesis. However, cast metal based removable partial dentures also has several limitations. PURPOSE: In this report, we present several cases of Valplast(R) flexible denture which were fabricated in patients who had medically compromised conditions or whose remaining teeth showed a relatively poor prognosis. RESULTS & CONCLUSION: This article describes an alternative treatment for a partially edentulous patient with mouth opening limitation, after cancer surgery, compromised general condition and questionable remaining teeth. In these patients, Valplast(R) flexible denture was used because of its unique characteristics and the results were all satisfactory. Patients had 1-2 check-up and there were no postoperative pain or fracture of denture up to now.