Pretratamiento y mejoría de la fuerza de unión de los cementos autoadhesivos de resina a los postes / Pretreatment and improvement of bonding strength of self-adhesive resin cements to posts

ABSTRACT Introduction: Posts and core are frequently used in endodontically treated teeth with excessive loss of coronal tooth structure. Objective: To evaluate the effectiveness of self-adhesive cements under different pre-treatments of dentin in the resistance to extrusion of fiberglass posts. Methods: An experimental in vitro study was conducted. The randomly selected sample was 56 extracted bovine incisors with mature apices and without root curvature. Before the cementing procedure, pretreatment of dentin was performed with 11.5 percent polyacrylic acid, 17 percent EDTA or sodium hypochlorite. The type of failure between the post/cement/dentin was evaluated by stereomicroscope. Two hundred and sixteen bovine dentin discs were used. The disks were approximately 1 mm thick, and were obtained from 72 bovine roots restored with intraradicular retentions. Data were analyzed for better comprehension in an SPSS database for Windows version 15. Results: The highest values were found in groups G3, G4 and G5, and there was no bond strength significant difference in group G2. Conclusions: The pre-treatment had no effect on dentin bond strength, and the self-adhesive cement RelyX U100 appears to be a viable option in the cementation of fiber posts(AU)

RESUMEN Introducción: Los postes y el núcleo se utilizan con frecuencia en los dientes tratados endodónticamente con una pérdida excesiva de la estructura dental coronal. Objetivo: Evaluar la efectividad de los cementos autoadhesivos bajo diferentes pretratamientos de dentina en la resistencia a la extrusión de postes de fibra de vidrio. Métodos: Se realizó una investigación experimental in vitro en 56 dientes de ganado seleccionados al azar con cierre apical maduro y sin curvaturas radiculares. Antes del procedimiento de cementación, se llevó a cabo el pretratamiento de la dentina con 11,5 por ciento de ácido poliacrílico, 17 por ciento de EDTA o hipoclorito de sodio. El estereomicroscopio evaluó el tipo de falla entre el poste / cemento / dentina. Se usaron 216 discos de dentina bovina. Los discos tenían aproximadamente 1 mm de espesor y se obtuvieron de 72 raíces bovinas restauradas con retenciones intrarradiculares. Los datos se analizaron para una mejor comprensión en una base de datos de SPSS para Windows versión 15. Resultados: Los valores más elevados fueron encontrados en los grupos G3, G4 y G5 y no fue significativa la prueba de resistencia en el grupo G2. Conclusiones: El pretratamiento no tuvo efecto sobre la fuerza de unión dentinaria, y el cemento autoadhesivo RelyX U100 parece ser una opción viable en la cementación postes de fibra(AU)

Repair of Iatrogenic Furcal Perforation with Mineral Trioxide Aggregate: A Seven-Year Follow-up.

Teeth with furcal perforation present difficult resolution and dubious prognosis. Several materials have been proposed and calcium silicate-based cements such as mineral trioxide aggregate (MTA) are the most recommended. However, its long-term clinical behavior still remains poorly understood. The present study reports a clinical case of furcal perforation repair using Angelus MTA, with a 7-year follow-up. Patient sought treatment 2 months after iatrogenic accident. First lower right molar presented clinical signs such as fistula and bone loss between mesial and distal roots. Firstly, all root canals were treated and then furcal perforation was sealed with MTA Angelus and the dental crown was restored with composite resin. Radiographic evaluation was immediately performed to analyze the furcal perforation filling. After 7 years, a new clinical and imaging evaluation using periapical radiography and cone-beam computed tomography (CBCT) showed absence of clinical signs and symptoms, and alveolar bone reconstitution with periodontal space reduction. Angelus MTA presented good clinical behavior in the iatrogenic furcal perforation resolution based on long-term clinical evidence.

Self-Etching Enamel Bonding Using Acidic Functional Monomers with Different-length Carbon Chains and Hydrophilicity.

PURPOSE: To compare the enamel bonding performace of two commercial and three experimental two-step self-etch adhesives containing acidic functional monomers with different carbon-spacer length and hydrophilicity. The contact angle was also assessed to evaluate the wettability of each tested material. MATERIALS AND METHODS: Forty extracted human molars were sectioned into four parts (buccal, lingual, mesial, and distal) and divided into 5 groups, according to the adhesives used: Clearfil SE Bond (CSE), AdheSE (ADSE), 10-MDP (15 mol% 10-methacryloyldecylphosphate), CAP-P (15 mol% caprolactone phosphate), and MTEP (15 mol% methacryloyltetraethylene phosphate). Enamel specimens were bonded with each adhesive and submitted to microshear bond strength (µSBS) testing after 24 h. The adhesives were applied onto additional enamel specimens without light curing to assess contact angle. Then the etching pattern was analyzed using SEM and confocal laser scanning microscopy (CLSM). The µSBS and contact angle data were analyzed by one-way ANOVA and Tukey's test (α = 0.05). RESULTS: 10-MDP showed the highest µSBS of the tested groups (p < 0.05), followed by CAP-P and CSE (p < 0.05). MTEP and ADSE exhibited the lowest µSBS (p < 0.05), but the difference between them was not significant. 10-MDP, CSE, and CAP-P exhibited lower contact angles (p < 0.05) than did ADSE and MTEP. The SEM and CLSM analyses showed that 10-MDP and CSE had the most pronounced etching patterns and deepest adhesive penetration. ADSE and MTEP exhibited weak etching ability and adhesive penetration, while CAP-P produced moderate etching and intermediate penetration. CONCLUSIONS: The length and hydrophilicity of the functional monomer spacer chain tested in this study influenced the enamel bonding performance. Functional monomers with longer chains and more hydrophobic properties, such as 10-MDP and CAP-P, may interact better with enamel and achieve higher enamel bond strength.

Endodontic Management of Open Apex Teeth Using Lyophilized Collagen Sponge and MTA Cement: Report of Two Cases.

Teeth with open apices, such as in immature teeth or those with apical root resorption are clinical cases with difficult immediate resolution. With the use of mineral trioxide aggregate (MTA) in dentistry, it was possible to optimize the treatment time of these cases by immediate placement of apical plug and the root canal filling. However, some negative effects can occur if MTA is extruded beyond the apex. To avoid this accident, it has been recommended to use of an apical matrix prior to placement of MTA. This study reports two clinical cases of apical plug placement in teeth with pulp necrosis and open apices. One case had an immature apex due to dental trauma and the other case had apical resorption due to the presence of endodontic infection in the root canal. MTA apical plug with approximately 4 mm thickness, was placed in the apical zone of the root and immediately the canal was obturated with gutta-percha and endodontic sealer. Follow-up evaluations showed clinical and radiographic evidence of success.

Sistemas cerámicos puros parte 2: materiales, propiedades ópticas y consideraciones clínicas / Pure ceramic systems part 2: materials, optical properties and clinical considerations

Mientras la odontología continúa avanzando, las técnicas estéticas han evolucionado en procedimientos más efectivos, funcionales y biocompatibles. Al mismo tiempo, la odontología estética se ha tornado un poco más compleja y técnicamente dificultosa. Con la mejoría de las propiedades (físicas y ópticas) de las cerámicas y el establecimiento de un protocolo de trabajo, las restauraciones cerámicas se han tornado cada día más populares. Actualmente existen diversos sistemas cerámicos que poseen excelentes propiedades ópticas como opalescencia, fluorescencia, translucidez, cromaticidad, que permiten mimetizar la restauración a la estructura dentaria. Desde el punto de vista físico se ha logrado devolver integridad biomecánica y estructural reforzando al remanente dentario. Todo esto ha llevado a la profesión a experimentar el uso de nuevos sistemas cerámicos que van desde las convencionales cerámicas feldespáticas hasta las modernas cerámicas reforzadas, inyectadas o confeccionadas con auxilio de computadoras. Su selección debe estar basada en la necesidad clínica, exigencias estéticas y funcionales, localización de la restauración, diseño protético y técnicas de laboratorio. Durante este artículo estarán abordadas las características de los materiales, sus propiedades ópticas y consideraciones clínicas para una correcta selección

While dentistry continues to advance, the aesthetic techniques have evolved in proceedings more effective, functional and biocompatible. Meanwhile, cosmetic dentistry has become a bit more complex and technically difficult. With improvement of the properties (physical and optical) of the ceramics and the establishment of a working protocol, ceramic restorations have become increasingly popular. Currently there are several ceramic systems have excellent optical properties such as opalescence, fluorescence, translucency, chromaticity, which allow the restoration to mimic the tooth structure. From the physical point of view has restored biomechanical integrity and strengthening the remaining tooth structure. All this has led the profession to experience the use of new ceramic systems ranging from conventional feldspathic ceramics to modem ceramic reinforced, injected or computer-aid made. The material selection should be based on clinical need, aesthetic and functional requirements, restoration site, prosthetic design and laboratory techniques. In this article we will deal with the characteristics of the materials, their optical properties and clinical considerations for proper selection

Sistemas cerámicos puros parte I: una evolución basada en la composición / Pure ceramic systems part I: an evolution based on composition

Los continuos avances en la tecnología, materiales dentales y equipamientos han contribuido significativamente con el nivel que la Odontología estética está logrando hoy. Entre estas innovaciones, el desarrollo de restauraciones de cerámica pura ha evolucionado aportando diferentes alternativas. Las cerámicas han presentado una rápida evolución desde el punto de vista tecnológico con el objetivo de mejorar las propiedades mecánicas y ópticas. En la actualidad existen varios sistemas de cerámicas libres de metal con propiedades mecánicas y ópticas excelentes, para la confección de coronas unitarias y plurales. Estos sistemas modernos se presentan con variadas composiciones y diferentes técnicas de confección, haciendo de estos más versátiles. Dentro de esta perspectiva, el mercado odontológico ofrece una gama enorme de nuevos materiales indirectos y sistemas libres de metal para la confección de prótesis, lo que proporciona nuevas opciones, más también nuevas interrogantes para decidir entre las alternativas disponibles. En este contexto esta revisión de la literatura tiene como objetivo abordar los diferentes sistemas cerámicos del punto de vista de su composición y sus diferentes técnicas de obtención

The continuing advances in technology, dental materials and equipment have contributed significantly to improve the level of esthetic dentistry today. Among these innovations, development of pure ceramic restorations has evolved to give different alternatives. Dental ceramics have presented a rapidly technological changing to improve mechanical and optical properties. Currently there are several systems of metal free ceramics with excellent mechanical and optical properties, for making crowns and plurals. These modern systems are presented with various compositions and different preparation techniques, making these more versatile. Within this perspective, the dental market offers a huge range of new indirect and metal-free materials for prostheses, providing new options, plus also new questions to decide among the available alternatives. The aim of this review is take a view of the different ceramic systems in terms of its composition and different techniques of production