Introduction Endodontically treated teeth are more susceptible to root fracture than vital teeth. In order to reduce the risk of fracture, the use of intra-radicular posts and crowns is indicated. However, their own fracture resistance remains unclear. Objective To analyze the behavior of metal-ceramic crown copings cemented to two types of intra-radicular posts under tensile stress. Material and method Sixteen metal-ceramic crown copings cemented with zinc phosphate cement to cast metal posts and cores (group 1, n = 8) or with self-adhesive resin cement to glass-fiber posts rebased with composite resin (group 2, n = 8) were subjected to tensile testing after endodontic treatment and standardized preparation. Failure occurred when the crown coping and/or post-core assembly fractured and/or detached. Result In group 1, after the application of a mean tensile load of 46.83 N, 7 crown copings and metal cores separated as a whole, while in 1 specimen the coping detached from the metal core. In group 2, a mean tensile load of 127.68 N resulted in glass-fiber post fracture, and in 1 case the entire crown-post-core assembly was detached. Tensile strength differed significantly between the two groups (p = 0.0085). Conclusion Our findings suggest that metal-ceramic crown copings cemented with self-adhesive resin cement show strong adhesion to composite resin cores associated with glass-fiber posts, thus providing a safe alternative to the use of cast metal posts and cores.

<p><span lang="EN-US">Among all desired requirements to dental prosthesis, marginal adaptation and passive fit are the most important. In some cases, in order to achieve these goals, it is necessary to cut and weld the teeth / implant-supported framework. Nowadays, the laser welding process shows a great advantage in comparison to other methods. The aim of this study was to evaluate the optimal laser welds point that is more appropriate to Ni-Cr prosthetic framework. A total of 60 specimens of Ni-Cr (35 mm x 4 mm) were designed and welded using a Nd:YAG laser device model EV 900. They were fixed in a metal piece 0.27 mm between the ends to be welded. All specimens were welded with 21 laser pulses diametrically opposed (frequency of 1.0Hz, load time 3.0 ms and 0.5 mm of diameter pulse). They were divided into three groups according to the electric current of the laser weld: A – 180A; B – 200A and C – 220A. To determinate the flexural mechanic strength, all specimens were submitted to a three-point bending test. The results obtained were: Group A = 553 Mpa; B = 751 Mpa and C = 802.1 Mpa. The control group was 1040.9 Mpa. ANOVA and Tukey’s test were performed and statistical significance differences were observed between group A and B as well as between group A and C. However, no significant difference was observed between B and C.</span></p>

superfície radicular mais benéfica para a regeneração do periodonto ainda não está estabelecida. Visando uma busca por esta superfície este trabalho utilizou 14 dentes de humanos recém extraídos, seccionados em corpos de prova e tratados com raspagem e condicionamentos com ácido cítrico e EDTA e analisados em microscopia eletrônica de varredura. As superfícies hígidas apresentavam grânulos regulares provenientes de fibras do ligamento periodontal rompidas na exodontia. As superfícies contaminadas apresentavam massas de cálculo aderidas e áreas de reabsorção cementária. Quando raspadas com curetas manuais as superfícies foram cobertas por "smear layer". O condicionamento com ácido cítrico foi eficiente na remoção total do "smear layer", assim como o condicionamento com EDTA gel, e o condicionamento com EDTA líquido não teve efetividade total na sua remoção. Tomando como padrão as superfícies hígidas, conclui-se que os tratamentos que mais se aproximam do ideal são a raspagem e condicionamento com ácido cítrico e EDTA gel sem diferenças entre si.

Every day have been increased the number of patients in the dental office looking for oral reabilitações, many of them being a challenge to the dentist surgeon. Currently, implants are installed on guided bone regeneration, the use of membranes, titanium threads and bone substitutes are key parts for correcting bone defects and to support the implant. Thereunto, the aim of this study was the description of a case addressing the methods and materials used for guided bone regeneration with the use of L-PRF for vertical bone gain. The patient showed the absence of the elements 22, 23 and 24, and a bony defect arc in this region. The installation of the implants, followed by guided bone regeneration support with a titanium mesh was indicated. The use of guided bone regeneration technique involving the mesh titanium implants, bone and lyophilized bovine L-PRF membrane showed a viable technique, the succeeding vertical bone gain until the implant platform.