A substituição total de restaurações dentais que apresentam pequenos defeitos são encontradas com muita frequência na prática da Odontologia. Entretanto, a possibilidade de reparos dessas porções defeituosas podem ser considerados alternativas viáveis à substituição. No entanto, pouco se conhece sobre a aplicação da técnica reparadora. O objetivo deste estudo foi analisar a formação acadêmica e as técnicas de reparos empregados em restaurações dentárias pré-existentes realizadas pelos Cirurgiões-Dentistas na Rede de Atenção em Saúde Bucal, em uma Capital da região Sul do Brasil. Identificando se os cirurgiões-dentistas realizam reparos em restaurações defeituosas, quando e como realizam, além de avaliar se receberam alguma forma de orientação no período acadêmico e se julgam obter sucesso em seus tratamentos reparadores. Para o desenvolvimento do estudo, foi escolhida a cidade de Curitiba. Dos 10 Distritos Sanitários que possui, foram selecionados 5 Distritos, totalizando 58 Unidades Básicas de Saúde. Um total de 134 Cirurgiões-Dentistas na ativa participaram da pesquisa e foram entrevistados aplicando-se um questionário realizado por um único pesquisador. Os questionários incluíam: dados pessoais, realização de reparos em restaurações; formação acadêmica para a execução desta conduta e a técnica empregada. Os resultados foram submetidos ao Teste Qui quadrado ou o Teste de Fisher e o software usado nas análises foi o Statistica 7.0 com nível de significância empregado de 5%. 99% dos Participantes relataram realizar reparos em restaurações e 69% deles não receberam orientação sobre a técnica de reparo durante o período acadêmico (graduação). Dos Participantes da pesquisa, 90% realizam o reparo independente do Profissional que realizou a primeira restauração (p=0,0001). As restaurações diretas são as mais comumente reparadas (65%) e a resina composta foi o material eleito (34%) para a realização do reparo (p=0,003). 77% dos Participantes pretendem utilizar o reparo em todas as situações possíveis (p=0,0001); 25% dos Participantes da pesquisa disseram que realizam o reparo da restauração independente da extensão da cárie (p=0,132); todas as idades são passíveis de receberem o reparo de restaurações defeituosas. A maioria dos Participantes realizam somente retenções adicionais no material restaurador remanescente e na estrutura dental (54%), 49% realizam retenções adicionais e bisel. Para o preparo do material restaurador remanescente e da estrutura dental, utilizam o ácido fosfórico e a aplicação do adesivo (98%) e somente 2% dos Participantes aplicam o silano previamente à aplicação do adesivo. As restaurações de reparo são muito bem aceitas pelos pacientes (98%) e o sucesso dos procedimentos de reparo, de acordo com os Participantes, é de 98%. Praticamente todos os Participantes da pesquisa (97%) acreditam que as técnicas de reparo devem fazer parte do currículo de graduação dos futuros Cirurgiões-Dentistas. Conclui-se que apesar da maioria dos Participantes afirmarem não ter recebido nenhuma orientação durante o período acadêmico (graduação) sobre a técnica de reparos, praticamente todos realizam reparos em restaurações defeituosas e julgam obter sucesso com esse tipo de tratamento. / The total replacement of dental restorations that present small defects are found very frequently in the practice of Dentistry. However, the possibility of repairing these defective portions can be considered viable alternatives to substitution. However, almost nothing is known about the application of the repair technique. The objective of this study was to analyze the academic training and repair techniques used in preexisting dental restorations performed by Dental Surgeons in the Dental Health Care Network in a Capital of Southern Brazil. Identifying whether dentists perform repairs on defective restorations, when and how they perform, and evaluate whether they have received some form of counseling in the academic period and are judged to succeed in their remedial treatments. For the development of the study, the city of Curitiba was chosen. Of the 10 Sanitary Districts it has, 5 Districts were selected, totaling 58 Basic Health Units. A total of 134 Active Dental Surgeons participated in the research and were interviewed applying a questionnaire carried out by a single researcher. The questionnaires included: personal data, repair of restorations; academic background for the execution of this conduct and the technique employed. The results were submitted to the Chi-square test or Fisher\'s test and the software used in the analyzes was Statistica 7.0 with a significance level of 5%. 99% of the Participants reported repairs on restorations and 69% of them did not receive orientation on the repair technique during the academic (graduation) period. The participants of the research, 90% performed the independent repair of the Professional who performed the first restoration (p = 0.0001). The direct restorations were the most commonly repaired (65%) and the composite resin was the material chosen (34%) to perform the repair (p = 0.003). 77% of Participants intend to use the repair in all possible situations (p = 0.0001); 25% of the participants of the study said that they performed repair of the restoration regardless of the extent of caries (p = 0.132); all ages are likely to receive repair of defective restorations. Most Participants only perform additional retentions on the remaining restorative material and dental structure (54%), 49% perform additional retentions and bevel. In order to prepare the remaining restorative material and dental structure, they use phosphoric acid and the adhesive application (98%) and only 2% of the participants apply the silane prior to the application of the adhesive. Repair restorations are very well accepted by patients (98%) and the success of repair procedures, according to the Participants, is 98%. Virtually all Research Participants (97%) believe that repair techniques should be part of the undergraduate curriculum of future Dental Surgeons. It is concluded that although most of the Participants affirm that they did not receive any orientation during the academic period (undergraduate) on the technique of repairs, practically all repairs in defective restorations and believe to be successful with this type of treatment.

In 1995, the Swedish government recommended the discontinuation of amalgam as restorative in paediatric dentistry. Because the mercury content in amalgam constitutes an environmental hazard, its use has declined. The use of resin composites is increasing, but the polymerisation shrinkage of the material is still undesirably high, and the handling of uncured resin can cause contact dermatitis. A new restorative material has recently been developed in Sweden as an alternative to amalgam and resin composite: a calcium aluminate cement (CAC). CAC has been marketed as a ceramic direct restorative for posterior restorations (class I, II) and for class V restorations. This thesis evaluates mechanical properties and clinical durability of the calcium aluminate cement when used for class II restorations. Hardness, in vitro wear, flexural strength, flexural modulus, and surface roughness were evaluated. A scanning electron replica method was used for evaluation of the interfacial adaptation to tooth structures in vivo. The durability was studied in a 2-year intra-individually clinical follow-up of class II restorations. Major results and conclusions from the studies are as follows: • The CAC was a relatively hard material, harder than resin-modified glass ionomer cement but within the range of resin composites. The CAC wore less than resin-modified glass ionomer cement but more than resin composite. • Flexural strength of CAC was in the same range as that of zinc phosphate cement and far below that of both resin composite and resin-modified glass ionomer cement. Flexural modulus of CAC was higher than both resin composite and resin-modified glass ionomer cement. The low flexural strength of CAC precludes its use in stress-bearing areas. • Surface roughness of CAC could be decreased by several polishing techniques. • For CAC restorations, interfacial adaptation was higher to dentin but lower to enamel compared with resin composite restorations. Fractures were found perpendicular to the boarders of all CAC restorations and may indicate expansion of the material. • After 2 years of clinical service, the class II CAC restorations showed an unacceptably high failure rate. Material fractures and tooth fractures were the main reasons for failure.

This study investigated the effect on microleakage of different bonding agents and glass and polyethylene fibers inserted at gingival margins of class V composite restorations. Sixty premolars were sterilized. Class V cavities were prepared, 1 mm below the cementoenamel junction. Prepared tooth were randomly divided into 12 groups (n=10). In experimental groups fiber inserts were inserted at the gingival seat. The control groups had no inserts. Restorations were incrementally placed and polymerized. Specimens were then stored in water and thermocycled for 500 cycles, then immersed in 2% procion dye and sectioned buccolingually, then dye penetration was assessed. Data were analyzed with the Kruskal-Wallis test and analysis of variance of ranks. No significant differences were found among the types of fiber or the two types of composites. Significant differences were found between the bonding agents. SE and LS show significantly lower microleakage than NT in class V composite restorations in dentin.

This study investigated the effect on microleakage of different bonding agents and glass and polyethylene fibers inserted at gingival margins of class V composite restorations. Sixty premolars were sterilized. Class V cavities were prepared, 1 mm below the cementoenamel junction. Prepared tooth were randomly divided into 12 groups (n=10). In experimental groups fiber inserts were inserted at the gingival seat. The control groups had no inserts. Restorations were incrementally placed and polymerized. Specimens were then stored in water and thermocycled for 500 cycles, then immersed in 2% procion dye and sectioned buccolingually, then dye penetration was assessed. Data were analyzed with the Kruskal-Wallis test and analysis of variance of ranks. No significant differences were found among the types of fiber or the two types of composites. Significant differences were found between the bonding agents. SE and LS show significantly lower microleakage than NT in class V composite restorations in dentin.

Made available in DSpace on 2014-06-11T19:31:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-07-30Bitstream added on 2014-06-13T20:41:42Z : No. of bitstreams: 1 roberto_ar_dr_arafo.pdf: 452023 bytes, checksum: 43fcf27450c655f9ab84cfbe7a78de11 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este estudo teve o objetivo de investigar a influência de diferentes procedimentos restauradores diretos com resina composta e pinos de fibra de vidro, na resistência à fratura de dentes com cavidades Classe IV, tratados endodonticamente e submetidos ao clareamento interno. Quarenta (n=40) incisivos laterais superiores humanos hígidos foram utilizados. Todos os dentes, com exceção do Grupo controle, foram submetidos ao tratamento endodôntico e então divididos em 5 Grupos (n=8): GI: Dentes hígidos; GII: Dentes tratados endodonticamente + resina composta (RC); GIII: Dentes tratados endodonticamente + clareamento com peróxido de hidrogênio (PH) a 35% + RC; GIV: Dentes tratados endodonticamente + Clareamento com PH a 35% + pino de fibra de vidro (Everstick/StichTeck) + RC; GV: Dentes tratados endodonticamente + Clareamento PH a 35% + RC e pino de fibra de vidro (Fibrekor Post; Jeneric Pentron Inc., Wallingford, CT, USA);. Os dentes tratados endodônticamente receberam cortes na coroa simulando uma classe IV e posteriormente restaurações de resina composta. O sistema LED-LASER Whitening Lase Light Plus (DMC Equipamentos Ltda, São Carlos, SP, Brasil) foi utilizado para ativação do agente clareador. Após o processo de clareamento, a restauração provisória e o tampão cervical dos dentes submetidos ao clareamento foram removidos para que cada Grupo fosse submetido ao procedimento restaurador. Após a confecção das restaurações as mesmas foram submetidas ao teste de resistência a fratura, em máquina de ensaios (EMIC). A Análise de Variância apontou efeito significativo de Grupos sobre a resistência (p=0,041). O teste de Tukey foi aplicado nas comparações múltiplas das médias de resistência, identificando somente a média de GIII (dentes tratados endodonticamente +clareamento com PH... / This study aimed to investigate the influence of restorative procedures on fracture resistance of teeth with Class IV cavities endodontically treated and submitted to internal bleaching with light source acceleration using LED-LASER system. Forty (n = 40) lateral incisors and healthy humans were used. All teeth, except for the control Group, were submitted to endodontic treatment and then divided into 5 Groups (n = 8): GI: healthy teeth, GII: endodontically treated teeth + composite, GIII: Teeth whitening endodontically treated with PH 35% + composite, GIV: Teeth whitening endodontically treated with PH 35% glass fiber post (Everstick / StichTeck) + composite, GV: Teeth whitening endodontically treated PH 35% + composite fiber and glass post (Fibrekor Post; Jeneric Pentron Inc., Wallingford, CT, USA). The crow of endodontically treated tooth was cut simulating a Class IV. The system LED LASER-Light Plus Whitening Lase (DMC Equipment Ltda, São Carlos, SP, Brazil) was used to activate the bleaching agent. After the whitening process, the buffer cervical and the temporary restoration of teeth submitted to bleaching have been removed so that each Group was subjected to the restorative procedure. After restorations the specimens were subjected to the same fracture toughness test, in a testing machine (EMIC). Analysis of Variance (ANOVA) showed significant effect on the resistance Group (p = 0.041). The Tukey test was applied in multiple comparisons for resistance means values, identifying only the mean of GIII (endodontically treated teeth bleaching with PH 35% + composite) significantly lower than GI (healthy teeth) (p = .026). It was concluded that teeth endodonticamentes treated with cavity class IV, subjected to internal dental bleaching with PH 35% and only restored with RC, have lower fracture toughness when compared to... (Complete abstract click electronic access below)

Orientador: José Roberto Cury Saad / Coorientador: Alessandra Nara de Souza Rastelli / Banca: Edson Alves de Campos / Banca: Marcelo Ferrarezi de Andrade / Banca: Marcos Porto de Arruda Filho / Banca: Jacy Ribeiro de Carvalho Junior / Resumo: Este estudo teve o objetivo de investigar a influência de diferentes procedimentos restauradores diretos com resina composta e pinos de fibra de vidro, na resistência à fratura de dentes com cavidades Classe IV, tratados endodonticamente e submetidos ao clareamento interno. Quarenta (n=40) incisivos laterais superiores humanos hígidos foram utilizados. Todos os dentes, com exceção do Grupo controle, foram submetidos ao tratamento endodôntico e então divididos em 5 Grupos (n=8): GI: Dentes hígidos; GII: Dentes tratados endodonticamente + resina composta (RC); GIII: Dentes tratados endodonticamente + clareamento com peróxido de hidrogênio (PH) a 35% + RC; GIV: Dentes tratados endodonticamente + Clareamento com PH a 35% + pino de fibra de vidro (Everstick/StichTeck) + RC; GV: Dentes tratados endodonticamente + Clareamento PH a 35% + RC e pino de fibra de vidro (Fibrekor Post; Jeneric Pentron Inc., Wallingford, CT, USA);. Os dentes tratados endodônticamente receberam cortes na coroa simulando uma classe IV e posteriormente restaurações de resina composta. O sistema LED-LASER Whitening Lase Light Plus (DMC Equipamentos Ltda, São Carlos, SP, Brasil) foi utilizado para ativação do agente clareador. Após o processo de clareamento, a restauração provisória e o tampão cervical dos dentes submetidos ao clareamento foram removidos para que cada Grupo fosse submetido ao procedimento restaurador. Após a confecção das restaurações as mesmas foram submetidas ao teste de resistência a fratura, em máquina de ensaios (EMIC). A Análise de Variância apontou efeito significativo de Grupos sobre a resistência (p=0,041). O teste de Tukey foi aplicado nas comparações múltiplas das médias de resistência, identificando somente a média de GIII (dentes tratados endodonticamente +clareamento com PH... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This study aimed to investigate the influence of restorative procedures on fracture resistance of teeth with Class IV cavities endodontically treated and submitted to internal bleaching with light source acceleration using LED-LASER system. Forty (n = 40) lateral incisors and healthy humans were used. All teeth, except for the control Group, were submitted to endodontic treatment and then divided into 5 Groups (n = 8): GI: healthy teeth, GII: endodontically treated teeth + composite, GIII: Teeth whitening endodontically treated with PH 35% + composite, GIV: Teeth whitening endodontically treated with PH 35% glass fiber post (Everstick / StichTeck) + composite, GV: Teeth whitening endodontically treated PH 35% + composite fiber and glass post (Fibrekor Post; Jeneric Pentron Inc., Wallingford, CT, USA). The crow of endodontically treated tooth was cut simulating a Class IV. The system LED LASER-Light Plus Whitening Lase (DMC Equipment Ltda, São Carlos, SP, Brazil) was used to activate the bleaching agent. After the whitening process, the buffer cervical and the temporary restoration of teeth submitted to bleaching have been removed so that each Group was subjected to the restorative procedure. After restorations the specimens were subjected to the same fracture toughness test, in a testing machine (EMIC). Analysis of Variance (ANOVA) showed significant effect on the resistance Group (p = 0.041). The Tukey test was applied in multiple comparisons for resistance means values, identifying only the mean of GIII (endodontically treated teeth bleaching with PH 35% + composite) significantly lower than GI (healthy teeth) (p = .026). It was concluded that teeth endodonticamentes treated with cavity class IV, subjected to internal dental bleaching with PH 35% and only restored with RC, have lower fracture toughness when compared to... (Complete abstract click electronic access below) / Doutor

A substituição total de restaurações dentais que apresentam pequenos defeitos são encontradas com muita frequência na prática da Odontologia. Entretanto, a possibilidade de reparos dessas porções defeituosas podem ser considerados alternativas viáveis à substituição. No entanto, pouco se conhece sobre a aplicação da técnica reparadora. O objetivo deste estudo foi analisar a formação acadêmica e as técnicas de reparos empregados em restaurações dentárias pré-existentes realizadas pelos Cirurgiões-Dentistas na Rede de Atenção em Saúde Bucal, em uma Capital da região Sul do Brasil. Identificando se os cirurgiões-dentistas realizam reparos em restaurações defeituosas, quando e como realizam, além de avaliar se receberam alguma forma de orientação no período acadêmico e se julgam obter sucesso em seus tratamentos reparadores. Para o desenvolvimento do estudo, foi escolhida a cidade de Curitiba. Dos 10 Distritos Sanitários que possui, foram selecionados 5 Distritos, totalizando 58 Unidades Básicas de Saúde. Um total de 134 Cirurgiões-Dentistas na ativa participaram da pesquisa e foram entrevistados aplicando-se um questionário realizado por um único pesquisador. Os questionários incluíam: dados pessoais, realização de reparos em restaurações; formação acadêmica para a execução desta conduta e a técnica empregada. Os resultados foram submetidos ao Teste Qui quadrado ou o Teste de Fisher e o software usado nas análises foi o Statistica 7.0 com nível de significância empregado de 5%. 99% dos Participantes relataram realizar reparos em restaurações e 69% deles não receberam orientação sobre a técnica de reparo durante o período acadêmico (graduação). Dos Participantes da pesquisa, 90% realizam o reparo independente do Profissional que realizou a primeira restauração (p=0,0001). As restaurações diretas são as mais comumente reparadas (65%) e a resina composta foi o material eleito (34%) para a realização do reparo (p=0,003). 77% dos Participantes pretendem utilizar o reparo em todas as situações possíveis (p=0,0001); 25% dos Participantes da pesquisa disseram que realizam o reparo da restauração independente da extensão da cárie (p=0,132); todas as idades são passíveis de receberem o reparo de restaurações defeituosas. A maioria dos Participantes realizam somente retenções adicionais no material restaurador remanescente e na estrutura dental (54%), 49% realizam retenções adicionais e bisel. Para o preparo do material restaurador remanescente e da estrutura dental, utilizam o ácido fosfórico e a aplicação do adesivo (98%) e somente 2% dos Participantes aplicam o silano previamente à aplicação do adesivo. As restaurações de reparo são muito bem aceitas pelos pacientes (98%) e o sucesso dos procedimentos de reparo, de acordo com os Participantes, é de 98%. Praticamente todos os Participantes da pesquisa (97%) acreditam que as técnicas de reparo devem fazer parte do currículo de graduação dos futuros Cirurgiões-Dentistas. Conclui-se que apesar da maioria dos Participantes afirmarem não ter recebido nenhuma orientação durante o período acadêmico (graduação) sobre a técnica de reparos, praticamente todos realizam reparos em restaurações defeituosas e julgam obter sucesso com esse tipo de tratamento. / The total replacement of dental restorations that present small defects are found very frequently in the practice of Dentistry. However, the possibility of repairing these defective portions can be considered viable alternatives to substitution. However, almost nothing is known about the application of the repair technique. The objective of this study was to analyze the academic training and repair techniques used in preexisting dental restorations performed by Dental Surgeons in the Dental Health Care Network in a Capital of Southern Brazil. Identifying whether dentists perform repairs on defective restorations, when and how they perform, and evaluate whether they have received some form of counseling in the academic period and are judged to succeed in their remedial treatments. For the development of the study, the city of Curitiba was chosen. Of the 10 Sanitary Districts it has, 5 Districts were selected, totaling 58 Basic Health Units. A total of 134 Active Dental Surgeons participated in the research and were interviewed applying a questionnaire carried out by a single researcher. The questionnaires included: personal data, repair of restorations; academic background for the execution of this conduct and the technique employed. The results were submitted to the Chi-square test or Fisher\'s test and the software used in the analyzes was Statistica 7.0 with a significance level of 5%. 99% of the Participants reported repairs on restorations and 69% of them did not receive orientation on the repair technique during the academic (graduation) period. The participants of the research, 90% performed the independent repair of the Professional who performed the first restoration (p = 0.0001). The direct restorations were the most commonly repaired (65%) and the composite resin was the material chosen (34%) to perform the repair (p = 0.003). 77% of Participants intend to use the repair in all possible situations (p = 0.0001); 25% of the participants of the study said that they performed repair of the restoration regardless of the extent of caries (p = 0.132); all ages are likely to receive repair of defective restorations. Most Participants only perform additional retentions on the remaining restorative material and dental structure (54%), 49% perform additional retentions and bevel. In order to prepare the remaining restorative material and dental structure, they use phosphoric acid and the adhesive application (98%) and only 2% of the participants apply the silane prior to the application of the adhesive. Repair restorations are very well accepted by patients (98%) and the success of repair procedures, according to the Participants, is 98%. Virtually all Research Participants (97%) believe that repair techniques should be part of the undergraduate curriculum of future Dental Surgeons. It is concluded that although most of the Participants affirm that they did not receive any orientation during the academic period (undergraduate) on the technique of repairs, practically all repairs in defective restorations and believe to be successful with this type of treatment.

Orientador : Luis Roberto Marcondes Martins / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-07-28T01:38:07Z (GMT). No. of bitstreams: 1 Worschech_ClaudiaCia_M.pdf: 487323 bytes, checksum: 63eea6a7fe297dfbe424400140e629bb (MD5) Previous issue date: 2000 / Resumo: O propósito deste estudo foi avaliar a resistência à fratura de pré-molares superiores com extensos preparos cavitários e restaurados com sistemas adesivos e não adesivos. Trinta pré-molares superiores extraídos e livres de cáries ou fendas foram aleatoriamente divididos em 6 grupos com 5 dentes cada. Os dentes do grupo 1 não receberam preparos cavitários mésio-oclusais (controle positivo). No grupo 2, os dentes receberam preparos cavitários, mas não receberam restaurações (controle negativo). Os grupos 3, 4, 5 e 6 receberam os preparos cavitários e foram restaurados de acordo com os respectivos grupos experimentais: G3: Single Bond + Solitaire; G4: Single Bond + Z250; G5: Amálgama (Dispersalloy); G6: Amálgama (Dispersalloy) + Panavia. Todos os grupos foram submetidos ao teste de resistência à fratura numa Máquina de Ensaio Universal (Instron). O carregamento foi aplicado verticalmente através de uma esfera metálica de 4,7 mm de diâmetro, posicionada sobre as vertentes das cúspides dos pré-molares, numa velocidade de 0,5 mm/ min. As médias de carregamento necessárias para fraturar as amostras em cada grupo foram (em kgf), G6 = 168,46 (A) ; G5 = 155,19 (A) ; G1 = 153,54 (A) ; G4 = 148,86 (A); G3 = 80,08 (B) ; G2 = 20,51 (C). Os resultados do teste de TUKEY revelaram diferenças entre os grupos mostrados acima com letras diferentes. Assim, pôde-se concluir que os pré-molares restaurados através dos materiais citados foram capazes de resistir à fratura tanto quanto um dente íntegro, exceto aqueles restaurados com resina composta Solitaire / Abstract: The aim of this study was to evaluate the fracture resistance of maxillary premolars with large cavities preparations. Thirty extracted maxillary premolars, sound and free from cracks were randomly assigned to six groups of five teeth each. The teeth from group 1 did not receive cavity preparations (positive control). In group 2, the teeth received preparations but did not receive restorations (negative control). From groups 3 to 6, the teeth received MO preparations and were restored according to the following techniques: G3: single Bond + Solitaire; G4: Single Bond + Z250; G5: Amalgam; G6: Amalgam + Panavia. All groups were submitted to fracture resistance test in a Universal Test Machine (Instron). The load was applied vertically through a metallic sphere of 4,7 mm diameter, touching only the cusps and never the restorations or cavity margins. The average load necessary to fracture the samples in each group was (in Kgf), G6= 168,46 (A); G5 = 155,19 (A) ; G1=153,54 (A) ; G4= 148,86 (A); G3= 80,08 (B) ; G2= 20,51 (C). The data were submitted to Tukey¿s test that revealed differences among some groups showed above with different letters. These results show that all materials tested can recover the fracture resistance of maxillary premolars as much as a sound tooth, except Solitaire resin / Mestrado / Dentística / Mestre em Clínica Odontológica

Magister Scientiae Dentium - MSc(Dent) / To determine the total volumetric change and the relative speed of shrinkage of bulk fill flowable composites during polymerization. The volumetric change that occur during the polymerization of dental composite restorations are considered to be one of the most significant contributing factors when considering the failure in composite restorations. Volumetric shrinkage of more than 2% is considered to be enough to result in the occurrence of secondary caries resulting in fracture of restorations and failure in the adhesive layer of a resin restoration. The total volumetric change of dental resins can be attributed to three main factors: Firstly, the polymerization reaction that results in the formation of a polymer chain. Secondly, the increase of the exothermic thermal effects produced by the polymerization reaction and thirdly, light irradiance energy that is transferred to the dental resin.

Magister Scientiae (Medical Bioscience) - MSc(MBS) / Introduction: Nosocomial infections are infections that occur 48 hours after receiving care for an unrelated condition in a clinic or a hospital environment, many of which are resistant to at least one of the drugs most commonly used to treat them. The dental clinical settings are reservoirs for the transmission of microbes through aerosols produced by routine dental procedures.