Orientador: Milton Carlos Kuga / Resumo: Objetivo: avaliar a influência do protocolo de irrigação: sem irrigação (WI), com irrigação alternada (AI) ou com a irrigação contínua (CI), em diferentes situações que influência diretamente na qualidade de adesão do pino de fibra de vidro ao substrato dentinário, para isso analisamos presença de resíduos, quantidade de túbulos dentinários abertos; resistência de união do sistema de cimentação na dentina; padrão de fratura da adesão e penetrabilidade dentinária. Material e métodos: raízes de incisivos bovinos foram obturadas, submetidas ao preparo para pino de fibra e distribuídas em grupos, de acordo com o protocolo de irrigação: (WI); (AI) e (CI), e o cimento utilizado (Allcem Core RelyX Ultimate). Após a conclusão do preparo, as raízes foram subdivididos em grupos (n=10), onde foram avaliadas em MEV para avaliar a presença de resíduos, em MEV para incidência de túbulos dentinários abertos na superfície dentinária, Microscopia Confocal a laser para avaliar a penetrabilidade, Estereomicroscopio para avaliar o padrão de fratura. Pinos de fibra foram cimentados com sistema de cimentação (RelyX Ultimate) nos demais espécimes (n=10) e submetidos ao teste de push-out e avaliação do padrão de fratura. Resultados: Em todas as avaliações os grupos que tiveram irrigação contínua no preparo do pino apresentaram valores significativamente melhores em relação ao que estava sendo analisado em especifico (P > 0,05). Os terços cervical e médio também apresentaram melhores resultado compar... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Objective: The aim of this study was to assess the influence of the irrigation protocol: without irrigation (WI), alternate irrigation (AI) or continuous irrigation (CI), in different situations that directly influence the adhesion quality of the fiber post to the dentin substrate, for this we analyzed the residues presence, the number of open dentinal tubules; bonding strength of the cementation system in dentin; adhesion failure pattern and dentin penetrability. Material and methods: roots of bovine were obturated, submitted to preparation for fiber post and distributed in groups, according to the irrigation protocol: (WI); (AI) and (CI), and the cement used (Allcem Core RelyX Ultimate). After the preparation was completed, the roots were subdivided into groups (n = 10), where they were evaluated in SEM to evaluate the residues, in SEM for incidence of open dentinal tubules on the dentin surface, Confocal laser microscopy to evaluate the penetrability, stereomicroscope to evaluate the failure pattern. Posts were cemented with cementation system (RelyX Ultimate) in the other specimens (n = 10) and submitted to the push-out test and evaluation of the failure pattern. Results: In all evaluations, the groups that had continuous irrigation in the preparation of the post showed significantly better values than the one being analyzed in specific (P> 0.05). The cervical and middle thirds also presented better results compared to the apical thirds. Conclusion: WI caused a greater p... (Complete abstract click electronic access below) / Doutor

No description available.

This thesis examines the development, production and function of dress pins in Anglo- Saxon England. It proposes a dated typology for the mid-5th to the mid-llth century and notes the implications of this for discussions of contact and cultural interaction between England and other parts of Europe. Chapter 1 defines the parameters of the study, and describes the data that was assembled on Anglo-Saxon pins. An evaluation of the previous work on pins from Northern Europe (Chapter 2) is followed by an investigation in Chapter 3 of the methods and process of typological analysis. After arguing that one of the most important (and neglected) aspects of typological research is 'the process of study1 the chapter provides terminological definitions for the components of pins. Chapter 4 examines the problems, principal methods and developments in pin production and discusses how changes in method reflected changes both in fashion and metalworking techniques. Building on this, Chapter 5 defines the groups of pins that have been found on sites of the Anglo-Saxon period, including: (1) definition of the types and sub-types; (2) determination of their date ranges; (3) description of their distribution; and (4) suggestions about the origin of each type. In Chapter 6 the types are put into chronological order, to demonstrate which types existed simultaneously and how pins developed over time. The function of pins is considered in Chapter 7 and several tentative hypotheses are put forward. The final chapter draws a number of conclusions from the study including: (1) Anglo-Saxon pins display a great deal of insularity during all periods, but particularly in the 8th and 9th centuries; (2) while regionalism may have been a feature of 6th century pins, it ceases to be important by the 8th century when many finds from middle Saxon trading sites seem consistently to be the same types, suggesting that in addition to trade between England and the Continent and Scandinavia it is time to evaluate the micro-economic and information exchange networks in Anglo- Saxon England; (3) lastly it notes the problem of dissemination of artefactual analyses and the difficulties to be encountered in using typologies and it puts forward a preliminary proposal for the use of expert systems (computer programs that simulate human performance in specialist task areas) as a tool to distribute this information. An example of a knowledge base that might be used to disseminate the typology presented here, The Anglo-Saxon Pin Identification Assistant, is to be found in Appendix 2, as are several sample identification sessions.

Orientador: Caio Cezar Randi Ferraz / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-22T04:14:56Z (GMT). No. of bitstreams: 1 Clavijo_ErikaManuelaAsteria_M.pdf: 12544846 bytes, checksum: e5ccc90481f71cac564a4038b3f3cc5f (MD5) Previous issue date: 2013 / Resumo: Este trabalho avaliou in vitro a resistência à fratura de raízes de incisivos bovinos com 3 espessuras de dentina, nas quais, foram cimentados pinos de fibra de vidro com e sem reembasamento com resina composta. 180 raízes bovinas foram padronizadas em 14 mm. Os espécimes foram divididos em 3 grupos de acordo com a espessura da parede dentinária: Grupo1 (G1) = 1 milímetro de espessura (n=60); Grupo 2 (G2): 2 milímetros de espessura (n=60) e Grupo Controle (G3)= raízes sem fragilização (n=60). Os 4 mm apicais dos canais radiculares foram selados com Coltosol® e as raízes foram inseridas em um material de moldagem a base de poliéter e resina acrílica para simulação ligamento periodontal. Em seguida, cada grupo foi subdividido em 2 sub-grupos (n=30): raízes que receberam cimentação de pino de fibra de vidro somente (P) e raízes que receberam cimentação com pino reembasado com resina composta (PR). O cimento Relyx ARC ® foi utilizado para cimentação dos retentores intrarradiculares. Os corpos-de-prova foram submetidos ao teste de resistência à fratura em máquina de ensaio com aplicação de carga em ângulo de 135º com o longo eixo do espécime por lingual (n= 90) e por vestibular (n=90). Os valores foram registrados em Newtons (N) submetidos à Análise de variância e teste de Tukey. As fraturas foram avaliadas em microscópio clínico e classificadas quanto à possibilidade de reabilitação pós-fratura em favoráveis e desfavoráveis. O dado obtido deste estudo mostrou não haver diferença estatística significativa entre os grupos avaliados (p>0,05) com relação ao teste de resistência a fratura com forças aplicadas por vestibular. Por lingual, o grupo G1PR apresentou diferença estatística quando comparado aos grupos G2P e G3P (p<0,05). No teste por vestibular, os espécimes do grupo PR que tiveram fratura radicular, tiveram a incidência de fraturas favoráveis em G1: 87,5%, G2: 80% e G3: 83,3%. Por Lingual, o grupo G3PR apresentou fraturas apenas nos núcleos de preenchimento, não havendo fraturas em raiz. O G1PR e o G1P apresentaram 80% dos espécimes com fraturas radiculares, das quais 91,67% e 66,67% foram classificadas como favoráveis. As diferentes espessuras de dentina não interferiram na resistência à fratura, sugerindo que dentes com paredes fragilizadas são passíveis de serem restaurados. No ensaio realizado por Lingual G1PR apresentou maior resistência a fratura. A maioria das fraturas radiculares, ocorridas nas raízes restauradas com pinos de fibra de vidro e núcleos de preenchimento em resina composta, foram consideradas favoráveis / Abstract: The aim of this is study was to evaluate in vitro fracture strength of weakened roots with 3 thicknesses of dentin, in which were cemented fiberglass posts and anatomic fiber posts (fiberglass post with composite resin). 180 freshly extracted bovine incisors were used. The crowns and apices of were sectioned to create the samples with 14 mm of root. The samples were divided into 3 groups: Group 1 (G1) = dentin walls with 1 mm thickness (n = 60), Group 2 (G2): dentin walls with 2 mm thickness (n = 60) and Control Group (G3) = roots without weakening (n = 60). 4mm apical root canal was sealed with Coltosol ®, and the samples were inserted into artificial periodontal ligament with an impression material and acrylic resin. Then, each group was divided into two subgroups (n = 30) that received roots luting of glass fiber post only (P) and roots receiving cementing anatomic fiber post (PR). The cement Relyx ARC ® was used for cementation of intracanal retainers. The samples were tested for fracture strength in a universal testing machine with load application angle of 135 degrees with the long axis of the specimen by palate (n = 90) and vestibular (n = 90). The values were recorded in Newtons (N) and statistically analyzed by ANOVA. The fractures were evaluated in clinical microscope and classified after fracture as favorable and unfavorable. Results from this study showed no statistically significant difference among the groups (p > 0.05) to the fracture strength test with forces applied by vestibular. On the lingual face there was statistically significant difference between groups G1PR and G1P when compared to CPR (p< 0.05). On the vestibular face the specimens restored with anatomic post that had root fracture from groups G1, G2 and G3 had the incidence of favorable fractures in 87.5%, 80% and 83.3% of the cases. By lingual the CPR group had fractures only in filling cores, with no root fractures. The G1PR and G1P showed 80% of specimens with root fractures, of which 91.67% and 66.67% were classified as favorable. The different thicknesses of dentin did not affect the fracture strength, suggesting that teeth with weakened walls are easily restorable. By Lingual. The anatomic post showed higher resistance to fracture. Most root fractures, when occur in teeth restored with fiberglass posts are considered favorable / Mestrado / Endodontia / Mestra em Clínica Odontológica

Orientador: Milton Carlos Kuga / Resumo: Os objetivos dos estudos foram avaliar os efeitos da cimentação provisória intrarradicular de um pino metálico com cimentos temporários, de composição química diferentes, e analisar a influência da irrigação com agitação ultrassônica passiva (PUI), sobre a resistência de união do cimento resinoso autoadesivo (Relyx U200) na dentina do espaço radicular preparado para pino de fibra de vidro. Noventa raízes unirradiculares de dentes humanos, foram padronizadas com o comprimento de 17,0 mm, a partir do ápice radicular. Os canais radiculares foram instrumentados até o instrumento F5, irrigados a cada troca de instrumento com 5 mL de hipoclorito de sódio a 2,5% e obturados com cimento contendo resina epóxi (AH Plus; Dentsply DeTrey GmbH, Konstanz, GER). Após 7 dias, foi preparado o espaço intrarradicular para pino de fibra de vidro, na extensão de 11mm, a partir da face cervical radicular, com brocas tipo Largo #1 e #2, e dada a conformação final com a broca #2 do sistema White Post DC (FGM, Joinville, SC, BR). No estudo 1, quarenta espécimes foram distribuídos em 4 grupos (n =10), de acordo com o tipo de protocolo de cimentação provisório do pino metálico: G1 (CO), sem a realização prévia da cimentação provisória do pino metálico intrarradicular; G2 (PR), cimentação provisória do pino metálico com o sistema Provy (Dentsply); G3 (RT) cimentação provisória do pino metálico com o sistema Relyx Temp NE (3M) e G4 (TB), cimentação provisória do pino metálico com o sistema Temp Bond NE (... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The aims of this study are to evaluate the effects of temporary intraradicular cementation of a metallic pin with temporary cements made from different chemical composition, and to analyze the influence of agitation with passive ultrasonic irrigation (PUI) on the bond strength of the self-adhesive resin cement (Relyx U200) in the root space dentin prepared for fiberglass pin. Ninety one-root human teeth were standardized with a length of 17.0 mm from the radicular apex. The root canals were instrumented up to instrument F5, irrigated at each instrument change with 5 mL of 2.5% sodium hypochlorite and filled with cement containing epoxy resin (AH Plus; Dentsply DeTrey GmbH, Konstanz, GER). After 7 days, the intraradicular space, 11mm in length, was prepared for the fiberglass pin, from the root cervical face with Largo # 1 and # 2 drills, and given the final conformation with the drill # 2 from White Post DC system (FGM, Joinville, SC, BR). In study 1, forty specimens were distributed into 4 groups (n = 10), according to the type of provisional cementation protocol of the metal pin: G1 (CO), without executing beforehand the provisional cementation of the intraradicular metallic pin; G2 (PR), provisional cementation of the metallic pin with Provy system (Dentsply); G3 (RT) temporary cementation of the metallic pin with Relyx Temp NE (3M) and G4 (TB) system, provisional cementing of the metallic pin with Temp Bond NE system (Sybron Kerr). In all groups, with exception of CO, met... (Complete abstract click electronic access below) / Mestre

Several methods of surgical stabilization of the atlantoaxial joint are described in the veterinary literature. Threaded acrylic pins placed ventrally together with polymethylmethacrylate (PMMA) is a well-established technique that has been widely used in clinical cases. However, Kishigami tension bands are a less technically demanding procedure with potentially fewer complications. The purpose of this study was to biomechanically compare these two techniques in ventral-to-dorsal bending in both mature and immature dogs. Seventeen normal canine cadavers <15kg were collected and radiographed to determine skeletal maturity. The cervical spines were dissected leaving bony and ligamentous structures intact. Eight mature spines and 9 immature spines were randomly divided into two groups. In one group a Kishigami tension band was applied over the dorsal arch of the atlas and attached to the spinous process of the axis using orthopedic wire. In the second group, six acrylic pins were placed ventrally in the atlas, axis, and transarticularly. The pins were then cut and covered with PMMA. The specimens were potted in custom steel pots and biomechanically analyzed in ventral-to-dorsal four-point bending. Load-displacement curves representing the degree of stiffness were compared between the groups. Stabilization using ventral pins and PMMA had a significantly greater stiffness than a Kishigami tension band when bending in ventral to dorsal bending. Within the stabilized vertebral segment, there was no significant difference between the stiffness of immature vs. mature bone. Further analysis in torsion and analysis in abnormal dogs will be helpful in establishing the clinical significance of these findings. / Master of Science

The purpose of this thesis is to analyse the pins from Bunge church, in order to investigate how what they can tell us about the burials inside the church. During the post medieval and early modern period pins were used to fasten the burial shrouds, and to stabilize the fabric on the inside of the coffin lids. Therefore these pins appear in grave contexts, and thus offer possibilities for interpretation of burials. The pins have been ordered according to the shape of the needlehead. A total of 697 pins have been analysed, amongst which four main pin types have been detected. The next step in the study was a chorological study where the pins positions were analysed in comparison to other finds such as craniums and coffin handles. Comparisons were also made with the placement of wall paintings, furnishings and the natural light intake in the church. The spatiality and dating of the pins have been used for the interpretation of the graves temporal and physical placement.

O estabelecimento de uma camada híbrida adequada no canal radicular representa um dos principais desafios clínicos devido à dificuldade de acesso. Dessa forma, o uso de inibidores proteolíticos poderia tornar-se um recurso favorável. O objetivo deste estudo foi avaliar o efeito de inibidores proteolíticos na união de pino de fibra de vidro fixado com cimento adesivo, considerando os terços radiculares e tempos distintos, por meio da resistência de união (RU). Cento e quarenta e quatro raízes bovinas foram selecionadas e divididas em 6 grupos de tratamento, e redivididas em 3 subgrupos de acordo com os tempos de avaliação de 24 horas, 6 e 12 meses (n=8). Após o tratamento endodôntico e desobturação padronizados, as raízes foram cimentadas com pinos de fibra de vidro cônicos (Exacto/Angelus). As raízes foram tratadas com sistema adesivo convencional de três passos, Adper Scotchbond Multipurpose/ 3M ESPE (SBMP) e cimento dual RelyX ARC/ 3M ESPE. Após prévia divisão, foram alocadas em grupos CN (Controle Negativo- sem pré tratamento associado), CP (Controle Positivo- com agentes ativador e catalisador), EDTA (ácido etilenodiamino tetra-acético a 17%), CHX (digluconato de clorexidina a 2%), E-5 (E- 64 a 5 M) e E-10 (E-64 a 10 M). Após 24 horas, as raízes foram seccionadas perpendicularmente ao longo eixo e identificadas quanto à região, obtendo-se fatias de 1 mm de espessura (cervical, médio e apical), que foram armazenadas em saliva artificial para serem testadas. Todas as fatias foram submetidas ao teste de extrusão (push-out) na máquina de teste universal (Instron) com célula de carga de 50 N a 0,5 mm/min. Os dados foram analisados pelo teste de ANOVA a três critérios e comparações múltiplas com Tukey, ambos com p<0,05. Após 24 horas, não se observou diferenças entre os tratamentos. Após 6 meses, a CHX demonstrou melhor desempenho, cujo efeito não se prorrogou até os 12 meses. O uso de inibidores proteolíticos não foram capazes de preservar a resistência de união dos pinos intrarradiculares até o tempo de 12 meses. / The adequate establishment of hybrid layer in the root canal on bonding process is still a clinical challenge due to its hard access. Thus, the use of proteolytic inhibitors could become a favorable tool. The aim of this study was to evaluate the effect of proteolytic inhibitors in the bonding of a glass- fiber post fixed with a luting cement, regarding the root thirds and different times through the bond strength. One hundred and forty four bovine roots were selected and divided into 6 treatment groups, and subdivided according to the time of evaluation of 24 hours, 6 and 12 months (n=8). After endodontic treatment and standardized removal procedure, the roots were cemented with tapered glass fiber posts (Exacto/ Angelus). The roots were treated with three-step etch-and-rinse adhesive system Adper Scotchbond Multipurpose/ 3M ESPE (SBMP) and dual cement RelyX ARC/ 3M ESPE. After previous division, CN (negative- control without pre associated treatment), CP (Control positive- with activator and catalyst agents) EDTA (17% ethylenediaminetetraacetic acid) CHX (2% chlorhexidine digluconate) E-5 (5M E-64) and E-10 (10M E-64). After 24h, the roots were sectioned perpendicular to the long axis and identified according to third in 1mm thick slices (cervical, middle and apical), which were stored in artificial saliva to be tested. All slices were subjected to extrusion tests (push-out) in the universal test machine (Instron) at 50 N load cell at 0.5 mm/min. Data were analyzed with three-way ANOVA and multiple comparisons with Tukey test, both with p <0.05. After 24 hours, no differences were observed between treatments. After 6 months, CHX showed better performance, which did not last up 12 months. The proteolytic inhibitors performed differently in the bonding process over time; only CHX promoted inhibition at 6 months. The use of proteolytic inhibitors were not able to maintain the bond strength of intraradicular posts up time of 12 months.

O objetivo deste estudo foi comparar à resistência à fratura de três técnicas de colagem usadas para restaurar dentes fraturados hígidos e com tratamento endodôntico associado ou não a colocação de pino de fibra de vidro. Noventa incisivos humanos foram aleatoriamente divididos em três grupos de 30 dentes cada. No grupo A, os dentes não foram tratados endodonticamente, enquanto os dentes dos grupos B e C foram submetidos ao tratamento endodôntico, seguido de restauração da câmara pulpar com resina composta. Todos os dentes foram fraturados por uma carga axial aplicada na superfície vestibular para obter fragmentos dentais. Os dentes de cada grupo foram novamente subdivididos em três subgrupos: colagem simples [CS], chanfro vestibular [CV] e chanfro circunferencial [CC]). Antes da colagem dos fragmentos, pinos de fibra de vidro foram colocados nos dentes do grupo C. Todos os fragmentos dos dentes (grupos A, B e C) foram colados utilizando um cimento de dupla ativação (Duo- Link, Bisco Inc). No grupo CS, nenhum preparo adicional foi realizado após colagem, porém no restante dos dentes realizou-se uma canaleta vestibular (grupo CV) ou uma canaleta circunferencial ao redor da linha de colagem (CC) com aproximadamente 1,0 mm de profundidade. As canaletas foram restauradas com resina composta microhíbrida. Por fim, os espécimes foram submetidos a mesma carga axial no mesmo ponto pré-determinado. A resistência à fratura após o procedimento restaurador foi expressa em porcentagem de resistência do dente íntegro. Os dados foram submetidos a uma análise de variância de dois fatores (Grupo vs. Técnica de colagem) e teste de Tukey (?=0,05). Somente o fator principal Técnica de colagem foi estatisticamente significante (p<0,05). Nenhuma das técnicas de colagem empregadas conseguiu restabelecer a resistência à fratura do dente hígido. A confecção de uma canaleta vestibular e circunferencial proporcionaram uma recuperação de resistência similar (p>0,05) entre si e superior ao alcançado pela técnica de colagem simples (p<0,05). Concluiu-se que o uso de pino de fibra de vidro não é essencial para reforço da estrutura dental antes da colagem de fragmentos de dentes tratados endodonticamente. As técnicas de chanfro vestibular e chanfro circunferencial devem ser preferidas ao se realizar a colagem de fragmentos devido a maior recuperação da resistência do dente hígido em relação a técnica de colagem simples. / The aim of this study was to compare the fracture strength of three techniques used to reattach tooth fragments in sound and endodontically-treated fractured teeth either associated or not with fiber post placement. Ninety human lower incisors were randomly divided into three groups of 30 teeth each. In group A teeth were not subjected to endodontic treatment; while teeth from groups B and C were endodontically treated and the pulp chamber restored with a composite resin. All teeth were fractured by an axial load applied to the buccal area in order to obtain tooth fragments. Teeth from each group were divided again into three subgroups: bonded only [BO], buccal chamfer [BC] and circumferential chamfer [CC]). Before the re-attachment procedures, fiber posts were placed in teeth from group C. All teeth (groups A, B and C) had the fragments re-attached using a dual cure resin luting cement (Duo-Link, Bisco Inc., Itasca, IL). In the BO group, no additional preparation was made. Teeth from groups BC and CC groups had a 1.0 mm-depth chamfer placed in the fracture line either on buccal surface [group BC] or along the buccal and lingual surfaces [group CC]. Increments of microhybid composite resin were used in subgroups BC and CC to restore the chamfer. The specimens were loaded until fracture in the same pre-determined area. The force required to detach each fragment was recorded and a percentage of fracture strength recovery calculated for each tooth. The data was subjected to a two-way analysis of variance (Group vs. Re-attachment technique) and Tukey\'s test (?=0.05). Only the main factor Re-attachment technique was statistically significant (p<0.05). None of the techniques used for teeth re-attachment restored the fracture strength of the intact teeth. The placement of buccal and circumferential chamfer yielded statistically similar (p>0.05) fracture strength recovery, which was superior to the bonded only technique (p<0.05). The use of fiber post is not mandatory for the reinforcement of the tooth structure before reattachment of fragments in endodontically-treated teeth. When bonding a fractured fragment, the buccal or circumferential re-attachment techniques should be preferable in comparison with the simple re-attachment without any additional preparation.

No description available.