Thesis (Ph. D.)--Medical College of Georgia, 1997. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--Medical College of Georgia, 1997. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.D.S.)--University of Hong Kong, 2009. / Includes bibliographical references (p. 87-98)

Thesis (M.A.)--Ohio State University, 1998. / Includes bibliographical references.

Thesis (Dr.)--Universidade de Sa︢o Paulo, 1968. / Includes bibliographical references.

Thesis (Dr.)--Universidade de Sa︢o Paulo, 1968. / Includes bibliographical references.

Orientador: Mário Fernando de Góes / Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-22T14:40:39Z (GMT). No. of bitstreams: 1 Arita_CarlaHarueMartins_M.pdf: 3875036 bytes, checksum: a7eb7c2f429f80e13807b4154f6963ae (MD5) Previous issue date: 2013 / Resumo: O objetivo do estudo foi avaliar a união de cimentos à base de metacrilato à superfície de um compósito à base de silorano, com ou sem prétratamento de superfície, em teste de microtração. No total, 84 discos de resina à base de silorano (3mmX10mm) foram confeccionados, 42 discos tiveram a superfície tratada (ST) com jatos de óxido de alumínio (50?m) e os demais (42) não tiveram a ST. Os discos foram divididos em 6 grupos e foram cimentados aos pares (n=5) conforme descrição: G1 (SAM+CD)-discos sem ST com aplicação do sistema adesivo à base de metacrilato (SAM) e cimentados com cimento resinoso dual (CD); G2 (JSAM+CD)-discos com ST com aplicação do SAM e cimentados com CD; G3 (CA)-discos sem ST cimentados com cimento resinoso autoadesivo (CA); G4 (JCA)-discos com ST cimentados com CA; G5 (SAS+CD)-discos sem ST com aplicação do sistema adesivo da resina à base de silorano (SAS), foi feita a aplicação do adesivo hidrófobo seguido da aplicação do primer, e cimentação com CD; G6 (JSAS+CD)-discos com ST com aplicação do SAS e cimentados CD. Os conjuntos (disco/cimento/disco) foram armazenados em água deionizada por 24 horas. Os conjuntos foram seccionados para a obtenção de amostras em forma de palitos de (0,7 ± 0,1mm). O teste de microtração (?TBS) foi realizado à velocidade de 0,5mm/min até a fratura. Foram calculadas as médias, desvios-padrão e análise estatística (?=0,05). Foram analisados os modos de fratura. Quatro discos, de cada grupo, foram tratados, cimentados aos pares e seccionados ao meio para análise da interface de união. As médias e desvios-padrão dos grupos foram: G1=0(0); G2=47,96(9,12); G3=50,37(8,63); G4=57,07(12,01); G5=70,74(9,18); G6=59,24(9,91). A média do G1 foi inferior e estatisticamente diferente dos demais grupos, que não apresentaram diferenças estatísticas entre eles (p>0,05). A união dos materiais à base de metacrilato à superfície da resina composta à base de silorano é influenciada pelo tratamento de superfície. Em contra partida, a união de materiais à base de metacrilato fosfatado parece não ser influenciada pelo tratamento de superfície / Abstract: The aim of this in vitro study was the investigation of microtensile bond strength of low-shrinkage silorane-based composite discs (with or without pretreatment) cemented with methacylate based-cements. In total, 84 discs of silorane-based composite (3mmX10mm) were fabricated, 42 were pretreated (PT) and 42 were not (sandblasting with oxide aluminium of 50?m) and cemented in pairs. They were divided in 6 groups (n=5) as described: G1 - no PT discs with methacrylate based adhesive applied (MA) and cemented with a methacrylate based dual cure cement (DC); G2 - PT discs with MA applied and cementes with DC; G3 - no PT discs cemented with self-adhesive cement (SA); G4 - PT discs cemented with SA; G5 - no PT discs with the adhesive of silorane based composite (ASC) applied, in this group the bond was applied first followed by the primer, and cemented with DC; G6 - PT discs with ASC cemented with DC. After 24h of deionized water storage, the sets were serially sectioned into sticks (0,7 ± 0,1mm). The microtensile bond strength test (?TBS) was performed at a crosshead speed of 0,5mm/min until failure. The means were calculated and statistically analyzed (?=0,05). Modes of falure were also determined. Four discs, for each group, were PT, cemented in pairs and cut in half to interface analysis. The means and standard deviations for all groups were: G1=0(0); G2=47,96(9,12); G3=50,37(8,63); G4=57,07(12,01); G5=70,74(9,18); G6=59,24(9,91). The mean presented by group 1 was the lowest and statistically different comparing with the others, wich did not differ statistically among each other(p>0,05). The ?TBS strength of methacylated materiais was significantly influenced by the surface pretreatment. On the other hand, the ?TBS strength of methacrylate materials with phosphate groups does not seem to be influenced by surface pretreatment / Mestrado / Materiais Dentarios / Mestra em Materiais Dentários

Charles University, Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Technology Author: Jiří Doubek Supervisor: Dr. Georgios Paraskevopoulos, Ph.D. Title of Thesis: Calcium phosphate bone cements: Synthesis, characterization and drug release properties Non-healing bone traumas are currently a complication, which may disable a patient from active life for a long period. Due to the fact that bone mass consists mostly of hydroxyapatite, a derivative of calcium phosphate - calcium phosphate cement (CPC) - is studied as an injectable bone substitute. The cement's characteristics (low setting temperature, injectability, bioactivity, and resorbability) are very promising. Furthermore, the possibility to incorporate a drug in the formulation that would support the healing process opens a way for new therapeutic options. Firstly, the aim of this research was to synthesize a high-quality α-tricalcium phosphate (α-TCP) and characterize its properties. Subsequently, the prepared α-TCP was used for the preparation of an injectable and washout resistant cement paste. Finally, the properties of developed pure or ibuprofen-loaded cement were examined by X-ray diffraction, Raman spectra, compressive strength, scanning electron microscopy, and dissolution studies. The obtained data revealed that...

Indiana University-Purdue University Indianapolis (IUPUI) / Background: Increasing prevalence of dental erosion has been observed in many countries, in both children and adults. This condition is often associated with softening of the dental surface by acid exposure, which may lead to severe and irreversible damage. The use of fluoride, pit and fissure sealants, dental adhesives and more recently a resin infiltrant has been suggested to manage dental erosion. Objective: To compare the protective effect of a resin infiltrant and other resin-based materials against dental erosion/toothbrushing abrasion in vitro. Materials and methods: Bovine enamel and dentin slabs were prepared, embedded, flattened and polished. Dental erosion lesions were created using 0.01 M of hydrochloric acid (pH 2.3 for 30 sec) and treated with resin-based materials (HS: Helioseal pit and fissure sealant; SP: Seal and Protect dentin 78 sealant, and IC: Icon resin infiltrant) or fluoride varnish (FV: Duraphat). A no-treatment group represented the negative control (C). The specimens were subjected to an erosion-abrasion cycling model for a total of 10 days. Each cycling day consisted of 2 min immersion in 0.01M HCl, at room temperature, for 4 times; and toothbrushing with either of the abrasive suspensions (low and high, as previously determined by the radioactive dentin abrasivity method). Enamel and dentin surfaces were scanned at baseline, after treatment, at 5 days and at 10 days using an optical profilometer. Surface change (loss/gain) was determined by subtracting the treated area from the reference (protected) areas. Significance level of 5% was adopted for the statistical analysis. Results: No differences were found among groups at baseline, regardless of substrate. After treatment, surface deposition was found for all test groups except for IC, which did not differ from C. For enamel, at day 5, FV, HS and SP had less surface loss than C and IC (p<0.0008), which did not differ from each other (p=1.00). At day 10, similar trend was observed except for FV, which showed surface loss similar to C, when brushed with high abrasive suspension. High abrasive caused more surface loss than low abrasive only for C at day 5 (p=0.0117) and 10 (p=0.0162). For dentin, at day 5, FV, HS and SP had less surface loss than C and IC (p≤0.0001), which did not differ from each other (p=1.00). At day 10, HS and SP had less surface loss than C, IC, and FV (p<0.0001), and FV had less surface loss than C for low abrasive (p=0.0009). Overall, high abrasive had significantly more surface loss than low abrasive at 10 days (p=0.0280). Conclusion: HS was the most effective material protecting enamel and dentin from erosion-abrasion, followed by SP. FV offered limited protection, while no benefit was observed for resin infitrant IC.

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