Reabilitação Oral

Influence of popular beverages on the fracture resistance of implant-supported bis-acrylic resin provisional crowns: an in vitro study

2024-02-17T03:00:09Z

Influence of popular beverages on the fracture resistance of implant-supported bis-acrylic resin provisional crowns: an in vitro study Ribera, Oriana Karolina Caldeira Implant-supported provisional restorations are critical for improving the esthetics and shaping of the peri-implant tissue. The mechanical properties of these provisional materials can be influenced by saliva, food, beverages, and interactions between these materials in the oral environment. Therefore, integrity of provisional restorations should be preserved throughout the treatment period. This study aimed to evaluate the fracture strength of implant-supported polymethyl methacrylate (PMMA) provisional restorations made of computer-aided design and computer-aided manufacturing when immersed in different solutions at a controlled temperature of 37° C for 7 days. Each analog-pillar-crown set was submerged in different liquids (distilled water, tea, coffee, red wine, and Coca Cola®) for 1 week at a controlled oral temperature of 37° C. The samples were then subjected to fracture forces. The moment of fracture of the crown was recorded and compared with those of the other samples. Specimens immersed in distilled water (control group) had the highest fracture resistance (mean [M]=1331.00, standard deviation [SD]=296.74), while those immersed in tea had the lowest mean strength to fracture (M=967.00, SD=281.86). Nutritional deficiency and inappropriate eating habits influence the fracture strength of temporary crowns, rendering them more elastic or less resistant to fractures.

Forças ortodônticas originadas na expansão maxilar: Ancoragem esquelética VS Ancoragem dentária uma revisão sistemática

2024-02-10T03:00:07Z

Forças ortodônticas originadas na expansão maxilar: Ancoragem esquelética VS Ancoragem dentária uma revisão sistemática Rego, Maria Carlota Cardoso Introdução: A expansão maxilar procura estabelecer a dimensão transversal esquelética em crianças ou adultos, através de movimentos ortodônticos, ortopédicos ou combinação de ambos. A força de expansão para separação das extremidades ósseas da sutura palatina mediana pode causar vestibularização dos dentes posteriores e deflexão alveolar. Objetivo: Analisar e comparar, os efeitos esqueléticos e dentários, no tratamento da discrepância maxilar transversal, pela distribuição de tensões e deslocamento no complexo craniofacial, durante a ativação dos aparelhos de expansão. Material e métodos: Realizou-se uma pesquisa bibliográfica na base de dados Medline/ Pubmed com as seguintes palavras-chave em conjugação ou individuais para a pesquisa: “MARPE”, “Hyrax”, “Hyrax expander”, “RME”, “Skeletal disjunction”, “Dentoalveolar expansion”, tendo selecionado 13 artigos científicos dos 72 encontrados sobre o respetivo tema. Resultados: Existe expansão maxilar significativa tanto com o uso de aparelho de expansão SARPE, MARPE como convencional. Constatou-se que o aparelho convencional requer cooperação dos pacientes ou seus responsáveis para a sua devida ativação, enquanto que o MARPE pode ser utilizado em qualquer idade minimizando os efeitos indesejados e que este último pode ser usado como alternativa ao SARPE, que é um tratamento mais dispendioso e que exige hospitalização por parte do paciente. Conclusões: Expansores com micro-implantes produzem maior aumento na cavidade nasal e largura maxilar comparativamente aos convencionais.É necessário conhecimento da anatomia óssea palatina e sutura palatina média para correto diagnóstico e planeamento da expansão maxilar. Tanto o uso de MARPE como de expansores convencionais tiveram efeitos dentários semelhantes e forma e tamanho do arco maxilar semelhantes. MARPE e SARPE consideram-se técnicas de tratamento eficazes em pacientes esqueleticamente maduros, no entanto, MARPE apresenta menos riscos associados e um custo mais reduzido em comparação ao SARPE. Contudo, ainda não há consenso das forças ótimas e qual a direção sobre as quais as mesmas devem ser aplicadas, de modo a originar as deformações necessárias nas estruturas de suporte para se obter o movimento pretendido, a qual ajudaria a minimizar os efeitos adversos.

The influence of cleaning solutions on the retention of overdenture attachments systems

2024-02-10T03:00:06Z

The influence of cleaning solutions on the retention of overdenture attachments systems Monteiro, Sofia Fernandes Dental-implant-supported reconstructions provide comfort and improvements in prosthetic function, adaptation, and stability over conventional treatment options. The objective of this study was to evaluate the effect of different denture cleansing solutions and their influence on the deterioration and loss of retention of overdenture attachments in a 12-month clinical-use simulation. In this way, ten specimens each of different brands of retentive caps made of Teflon (OT Equator® (Rhein83, Bologna, Italy), Locator® (Zest Anchors, Escondido, CA, USA), Kerator® (KJ Meditech, Gwangiu, Republic of Korea), and Locator R-Tx® (Zest Anchors, Escondido, CA, USA)) were immersed in five different cleaning solutions (Kukident® (P&G Tech, Oxford Parkway, UK), Benfix® (Laboratorios URGO S.L., Guipúzcoa, Spain), Corega® (Stafford Miller, Waterford, Ireland), and Protefix® (Neuhofer Weiche, Parchim, Germany)), and tap water was used as the control group, in a simulation that lasted 12 months. Data were analyzed using two-way ANOVA and a Tukey HSD. Furthermore, a Levene Test and Shapiro–Wilk tests were performed to assess the validation of the ANOVA assumptions. The statistical analysis was performed using R version 4.2.2 software with the significance level set to p < 0.05. There were significant statistical differences between the different manufacturers regarding the retention forces of the attachment’s retentive caps (F = 322.066, p < 0.001). For the cleaning solution groups, different statistical results between Kukident® (P&G Tech, Oxford Parkway, UK) (p < 0.05) and Benfix® (Laboratorios URGO S.L., Guipúzcoa, Spain) (p < 0.05) were observed. There were no significant statistical differences between Corega® (Stafford Miller, Ireland), Protefix® (Neuhofer Weiche, Parchim, Germany), and tap water, even though the retention forces decreased in all of them.

Opportunistic Pathogens Isolated from Peri-Implant and Periodontal Biofilm from Adjacent Teeth

2024-02-10T03:00:07Z

Opportunistic Pathogens Isolated from Peri-Implant and Periodontal Biofilm from Adjacent Teeth Sá, Ana Maísa Malheiro de Even though most studies consider strict anaerobe Gram-negative bacteria as the main factor associated with peri-implantitis, other studies have identified other microorganisms present in implants and related to peri-implant disease that have the ability to reduce the effectiveness of treatment, such as Candida spp., Enterococcus faecalis and Pseudomonas aeruginosa. Therefore, microbiologic diagnosis is important for the success of implant treatment. The main goal of this study was to detect Candida spp., E. faecalis and P. aeruginosa in periodontal and peri-implant biofilms in the presence or absence of disease and relate the presence of these microorganisms with demographic data, systemic diseases, hygiene habits, the type of implant connection and endodontic treatment. The study population consisted of 20 patients that filled out a questionnaire regarding gender, age, systemic diseases, and oral hygiene. Peri-implant and periodontal biofilms from an adjacent tooth, both with and without disease, were analysed for the presence of these three opportunistic pathogens. Microbiological analysis revealed a higher prevalence of E. faecalis in patients with and without periodontal and peri-implant disease. Candida spp. was identified in a higher degree in cases with disease, and P. aeruginosa was mostly detected in peri-implantitis. The detection of these three pathogens suggested a possible means of transmission of infection from adjacent teeth to implants, with implant design associated with rehabilitation as a primary cause of pathogen growth. Although this study did not relate pathogen growth directly to periodontal disease, the high values UFC/mL values of E. faecalis may reveal an etiologic role of this bacterium in peri-implantitis.