Introduction: Marginal discrepancies may lead to cement washout and marginal leakage, damaging periodontal and pulp tissues or causing premature loss of the restoration. Purpose: This study evaluated the influence of application site of provisional cement on the marginal adaptation of provisional crowns. Material and Methods: Four different application sites of provisional cement (Temp Bond NE, Kerr Corporation) were used for cementation of provisional crowns on phantom teeth prepared for full crown restorations, performing 4 experimental groups (n=10): cement applied to all internal surfaces of the crown (CAO); cement applied to all internal surfaces of the crown, except for the occlusal surface (CA); cement applied to the cervical crown margin (CM); and cement applied to the cervical tooth margin (TM). A comparison microscope (Mitutoyo America Corporation) was used to measure the distances between the internal tangents of two circular marks, one made on the provisional crown and one made apical to the tooth preparation margin, in areas corresponding to buccal, lingual, mesial and distal surfaces. Marginal adaptation was determined before and after cementation, with 0.0001-mm accuracy. Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. Results: Mean values of marginal opening obtained for each group were: CAO: 145 μm; CA: 67 μm; CM: 46 μm; TM: 34 μm. CA, CM and TM presented significantly lower marginal openings than CAO (p<0.05). Conclusion: complete filling of the crown with provisional cement, including the occlusal surface, provided grater marginal discrepancies when compared to the other methods evaluated.
any temporary cements are commercially available; therefore, it is necessary to indicate them for each clinical requirement with regard to the tensile strength of prosthetic retainers. Thus, the purpose of this study was to compare the retention of provisional crowns cemented with eight temporary cements, over full crown preparations with standardized mechanical principles as height, taper, and length. For that purpose, eighty human first premolars received full crown preparation with standardized height and taper. Provisional crowns were fabricated and luted with eight brands of temporary cements. Twenty four hours after cementation, the restorations were submitted to tensile strength test in a universal testing machine and the data submitted to ANOVA and Bonferroni tests. Mean tensile strength values ranged from 20.1N for Nogenol cement to 67.5N for Hydro C cement. Statistically significant difference (p<0.05) was found between Hydro C and the other groups, except for Temp Bond and Rely X Temp, which presented statistically significant difference when compared to Freegenol and Nogenol temporary cements. The crowns cemented with Hydro C cement were more retentive that than those cemented with the other cements, except for Rely X Temp and Temp Bond. The less retentive crowns were those cemented with Nogenol and Freegenol temporary cements. Uniterms: Temporary cements; Tensile strength; Tooth crown preparation. uitas marcas de cimentos temporários estão disponíveis no mercado odontológico, sendo necessário adequá-los a cada necessidade clínica no que diz respeito à resistência à remoção dos retentores protéticos. Assim, o objetivo desse estudo foi avaliar a retenção de coroas provisórias cimentadas com oito cimentos temporários sobre preparos para coroa total com princípios mecânicos padrozinados como altura, conicidade e extensão. Para isso, oitenta primeiros pré-molares humanos receberam preparos para coroa total com altura e conicidade padronizadas. Coroas provisórias foram confeccionadas e cimentadas com oito marcas de cimentos temporários. Vinte e quatro horas após a cimentação, as restaurações foram tracionadas em uma máquina universal de ensaios e os dados submetidos aos testes estatísticos de ANOVA e Bonferroni. Os valores médios de resistência à tração variaram de 20,1 para o Nogenol a 67,5 para o Hydro C. Diferença estatisticamente significante (p<0.05) foi encontrada entre o cimento Hydro C e os outros grupos, com exceção do Rely X Temp e do Temp Bond, que apresentaram diferença estatisticamente significante quando comparados aos cimentos Freegenol e Nogenol. As coroas cimentadas com Hydro C foram mais retentivas do que aquelas cimentadas com os outros cimentos com exceção do Rely X Temp e do Temp Bond. As coroas menos retentivas foram aquelas cimentadas com os cimentos Nogenol e Freegenol.
PurposeThis study aimed at evaluating the bacterial colonization in dental implants inserted in the crestal or supracrestal position and correlated it to radiographic bone measurements.MethodsThirty-five implants with regular platform in nine patients (mean age 62.4±11.2 years) were inserted either at the bone crest level (control group) or at a suprecrestal level (test group). Radiographic examination was performed at baseline (implant installation) and after 6 months. Clinical and microbiological data were collected after 6 months. Digital radiography was used to assess bone remodeling (marginal bone loss and optical alveolar density). Bacterial profile was analyzed by checkerboard DNA–DNA hybridization, including a panel of 40 bacterial species.ResultsAfter 6 months, there were significantly higher counts of Actinomyces gerencseriae (p=0.009) and Streptococcus constellatus (p=0.05) in the test group. No significant differences between test and control groups were observed for marginal bone loss (p=0.725) and optical alveolar density (p=0.975). Probing depth was similar in both groups.ConclusionSignificantly higher counts of A. gerencseriae and S. constellatus were found in implants placed at the supracrestal level compared to the ones placed at the bone level. No relation was found between the installation level of dental implants and peri-implant bone remodeling.
RESUMOReabilitações orais sobre implantes osteointegráveis enfrentam crescentes exigências protéticas e estéticas, necessitando de um planejamento protético-cirúrgico preciso. O planejamento em pacientes edêntulos pode ser realizado usando análise cefalométrica para determinar o posicionamento dos dentes na prótese e conseqüentemente dos implantes. Esse caso clínico descreve o planejamento e tratamento de uma reabilitação oral sobre implantes usando análise cefalométrica para otimizar o sucesso protético assim como o conforto do paciente. Paciente apresentando edentulismo total mandibular e parcial maxilar com elementos anteriores insatisfatórios estética e funcionalmente, com inclinação vestibular acentuada. Para a determinação do correto posicionamento dos elementos superiores foi necessário a utilização de traçado cefalométrico de Steiner para o posicionamento do incisivo central superior no enceramento diagnóstico. Dessa forma, foi realizado exodontia dos elementos anteriores superiores, instalação de implantes osteointegraveis (Neodent ® , Curitiba, Brasil) e instalação de prótese fixa provisória imediata. Após 30 dias, foi realizada cirurgia para instalação de 4 implantes osteointegráveis (Neodent ® , Curitiba, Brasil) na região intermentoniana, sobre os quais foi instalada uma prótese total implanto-suportada inferior provisória. Após período de osteointegração, as próteses sobre implantes definitivas foram confeccionadas.Termos de indexação: Circunferência craniana. Implantação dentária. Prótese dentária. it is impossible to use these method because of the presence these teeth in the arch. This makes it imperative to perform a cephalometric evaluation to guide the positioning of the teeth in the denture 4 . Steiner [5][6] , in his cephalometric studies, determined standard measurements of both the angle formed by the intersection of the long axis of the maxillary central incisor (1/) with line N-A (of the most anterior point of the Planning and treatment in oral rehabilitation with implant-supported prostheses using cephalometric analysis
Este estudo avaliou a influência de técnicas de tratamento superficial da resina acrílica na adesão de placa bacteriana utilizando microbiota encontrado na cavidade bucal. Foram confeccionados noventa corpos de prova cilíndricos em resina acrílica autopolimerizável e divididos em nove grupos, para utilização de várias técnicas de tratamento superfi¬cial usualmente utilizadas nesse material. Os corpos-de-prova foram inseridos em meio de cultura contendo microbiota colhido de um paciente adulto por sete dias, corados e avaliados em relação à área de superfície coberta pela placa bacteriana. Dos métodos avaliados, a cola instantânea Super-Bonder, o verniz Extoral, o uso do torno + pedra pomes + branco de Espanha e o polimento químico propiciaram menor aderência bacteriana quando comparados a métodos de tratamento menos abrasivos.
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