Interaction effect of Nd:YAG laser and universal adhesive system for dentin sealing

To evaluate the influence of the association of the universal adhesive system to different energy densities of the Nd:YAG laser on the hydraulic conductance of dentin. Fifty bovine dentin discs were made. The samples were stratified into four groups (

Efeito da carga cíclica na resistência de dentes tratados endodonticamente restaurados com pinos dentários convencionais e estéticos

INTRODUCTION: Esthetic post and core systems were recently introduced. There are few reports regarding their behavior under cyclic loading. OBJECTIVES: This study compared the effect of cyclic loading on survival rate, residual strength and mode of fracture of endodontically treated teeth restored with esthetic and direct metallic post systems subjected to mechanical cyclic loading. MATERIALS AND METHODS: Thirty canines were endodontically treated, decoronated and prepared for metal free ceramic crowns, leaving 1.5 mm of dentin for ferrule effect. They were distributed in 3 groups and restored as follows: group 1 with zirconia posts (Cosmopost) and glass-ceramic cores (IPS Empress Cosmopost); group 2 with fiber reinforced composite posts (FibreKor) and group 3 with titanium posts (AZthec Anchor). Direct resin composite (Build It FR Resin Composite) was used as core in groups 2 and 3. All specimens were restored with all ceramic crowns (IPS Empress 2). A resin cement/adhesive system (Cement It/Bond It Primer A+B) was used to lute the posts to root canals and metal free porcelain crowns to the teeth preparation. Specimens were subjected to mechanical load of 250 N for 500,000x at a frequency of 1.7 Hz and then to static load until failure in a universal testing machine. Data were analyzed using One-way ANOVA and Fischer Exact tests alpha=0.05. RESULTS: All groups had 100% survival rate after cyclic loading; fracture strength values (SD) in N were: group 1 = 886.5(170.6), group 2 = 762.2(113.6) and group 3 = 768.9(72.9); there was no difference among groups (p=0.08); the percentage of mode of favorable fracture found was: group 1 = 60%, group 2 = 90% and group 3 = 50%; there was no correlation between the mode of failure and post and core system used (P=0.142). CONCLUSIONS: Esthetic post and core systems showed statistically equivalent fracture strength values, mode of failure and survival rate compared to conventional direct metallic post and resin composite core system after cyclic loading.INTRODUÇÃO: Os sistemas de núcleos intra-radiculares estéticos foram recentemente introduzidos no mercado. Não existem muitos trabalhos na literatura comparando seu comportamento em relação aos sistemas de pinos metálicos convencionais quando submetidos à testes com carga cíclica. OBJETIVOS: este estudo comparou a taxa de sobrevivência, resistência à fratura e modo de fratura de dentes tratados endodonticamente reconstruídos com sistemas de núcleos intra-radiculares metálicos convencionais e estéticos, restaurados com coroas de porcelana pura e submetidos à carga cíclica. MATERIAIS E MÉTODOS: trinta caninos tiveram as coroas removidas 1,5mm acima da junção cemento-esmalte e preparados para coroa de porcelana pura deixando 1,5mm de dentina acima do término do preparo. Os dentes foram distribuídos em 3 grupos de 10. O grupo 1 foi restaurado com pinos de cerâmica de zircônia e núcleos de preenchimento em cerâmica vítrea termo-injetada. O grupo 2 foi restaurado com pinos de resina composta reforçada por fibra de vidro e o grupo 3 com pinos de titânio. Nos grupos 2 e 3 foi usada resina composta reforçada com fibra de vidro como material para núcleo de preenchimento; os dentes foram restaurados com coroas totais e tanto os pinos quanto as coroas de porcelana foram cimentados com um sistema de cimentação resinosa de polimerização dupla. Os espécimes foram incluídos em resina acrílica e submetidos à uma carga de 250N por 500,000 ciclos, numa freqüência de 1,7Hz sendo em seguida submetidos à carga estática em uma máqina de testes universal até a falha. Os dados foram analisados estatisticamente com os testes ANOVA a 1 critério e Exato de Fischer (alfa=.05). RESULTADOS: a taxa de sobrevivência foi de 100%; os valores de resistência à fratura em N (DP) foram: grupo 1 = 886,50(170,6), grupo 2 = 762,2(113,6) e grupo 3 = 768,9(72,9). Não houve diferença estatística de resistência à fratura entre os grupos (P=0.08). O percentual de modo de fratura favorável encontrado foi: grupo 1 = 60%; grupo 2 = 90% e grupo 3 = 50%. Não houve correlação entre o tipo de pino e modo de fratura (P=0.142). CONCLUSÃO: dentes restaurados com sistemas de núcleos intra-radiculares estéticos e coroas totais de porcelana tiveram as mesmas taxas de sobrevivência, valores de resistência à fratura e modo de fratura que os metálicos convencionais diretos após aplicação de carga cíclica

IMPORTÂNCIA DO USO DO PROTETOR BUCAL NA PREVENÇÃO DE TRAUMAS DENTAIS DURANTE A PRÁTICA ESPORTIVA – ARTIGO DE REVISÃO / IMPORTANCE OF MOUTHGUARD IN DENTAL TRAUMA PREVENTION DURING SPORTS

Introdução: A prática de esportes promove grandes benefícios para a saúde do indivíduo, porém as atividades físicas constituem um dos principais fatores etiológicos de injúrias orofaciais. Objetivo: Analisar, por meio de revisão da literatura, a importância, a efetividade do uso e os tipos de protetores bucais empregados durante as práticas esportivas bem como, avaliar os seus efeitos na prevenção dos traumatismos dentários. Métodos: Com o auxilio das bases de dados, PUBMED e MEDLINE e LILACS foram obtidos 79 resumos publicados de jan/2009 a ago/2013 que fundamentaram grande parte do estudo. Estes foram analisados e selecionou-se 63 resumos potencialmente relevantes para o estudo em questão. Obtiveram-se 48 pesquisas, 13 revisões de literatura e 01 caso clínico e 32 artigos foram considerados nesta revisão de literatura, de acordo com os critérios de inclusão e exclusão estabelecidos. Resultados: Devido a elevada prevalência de fraturas orofaciais ocasionados por práticas esportivas de contato e não contato, verificou-se a grande necessidade da prevenção. A adoção de protetores bucais mostrouse como uma manobra importante a ser adotada, com isto a técnica mais adequada precisa ser adequadamente implementada. Conclusão: Após a avaliação da literatura, observou-se que são necessários mais programas sócio-educativos organizados pela classe odontológica a fim de alertar aos treinadores e atletas sobre as injúrias dentais ocasionadas durante a prática esportiva.Palavras-chave: Traumatismos em atletas. Prevenção de acidentes. Esportes.AbstractIntroduction: Sports practice promotes great benefits to individual health, but physical activity is a major etiological factor of orofacial injuries. Objective: To analyze, by literature review, the importance and effectiveness of use and the different types of mouthguards used during sports practices by evaluating their effects in the prevention of dental trauma. Methods: Considering books and PubMed, MEDLINE and LILACS databases, 79 abstracts published between Jan/2009 and Ago/2013 were obtained and substantiated much of the study. These were analyzed and 63 potentially relevant abstracts were selected to the study. Forty eight researches, 13 literature reviews and one clinical case were evaluated, and only 32 articles were considered in this literature review, in accordance with inclusion and exclusion criteria established. Results: Because the observation of high prevalence of orofacial fractures caused by contact and no-contact sports practices, there was a great need for prevention. The adoption of mouthguards appeared as important alternative to be adopted, thus the most suitable technique needs to be properly implemented. Conclusion: After the literature review, it was observed that social and educational programs organized by the dental class to alert coaches and athletes of dental injuries caused in sports are needed.Keywords: Athletic injuries. Accident prevention. Sports

Correlation between the Periapical Index and Lesion Volume in Cone-Beam Computed Tomography Images

Introduction: The study aimed to correlate the Periapical Index (PAI), obtained by way of periapical radiographs, with the volume of chronic periapical lesion, obtained through cone-beam computed tomography (CBCT), in the permanent teeth. Methods and Materials: Radiographs and CBCT images were selected from 35 single-rooted permanent teeth, with fully formed apices, with a diagnosis of pulp necrosis and chronic apical periodontitis that was radiographically visible. Two independent raters evaluated the radiographs on two separate occasions and classified the periapical lesions in accordance with Ørstavik’s PAI. The periapical lesion volume was calculated in the CBCT images. The correlation between the PAI and the lesion volume was calculated using Spearman’s correlation test. Results: There was a positive, moderate correlation between the PAI and the volume (rs=0.596; P<0.001) where rs2 is equal to 0.355, showing that only 35% of the PAI variation was dependent upon the variation in periapical lesion volume. Conclusion: The radiographic evaluation of the periapical lesion does not reflect the lesion’s volumetric characteristics as the volume had a moderate effect on the choice of PAI score.Keywords: Apical Periodontitis; Cone-Beam Computed Tomography; Endodontics; Periapical Radiograph

Cardiovascular risk factors in military personnel of the brazilian airforce at Alcântara (MA)

Objective: To investigate the frequency of cardiovascular risk factors in military personnel of the Brazilian Air Force in Alcântara, Brazil. Methods: A retrospective cross-sectional study was conducted with clinical records of 240 active military personnel from the Medical and Statistical Archives Service and nutritional assessment from the Nutrition Subsection Sector. The modifiable (diabetes mellitus - DM, systemic arterial hypertension - SAH, generalized obesity, abdominal obesity, hypercholesterolemia, hypertriglyceridemia, sedentarism, smoking, and alcoholism) and non-modifiable (gender and age) cardiovascular risk factors, anthropometric data, and cardiovascular diseases (CVD) were extracted. Descriptive statistics and chi-square test was applied (a=5%). Results: The sample was predominantly male (55.8%) and with a mean age of 33 (±8.4) years. The most prevalent risk factors were overweight (43.8%), abdominal obesity (42.9%), generalized obesity (21.3%), alcoholism (34.6%), and sedentary lifestyle (31.3%). Regarding the distribution of cardiovascular risk factors in relation to gender, a significant association was found with SAH, sedentarism, abdominal obesity and nutritional status (p=0.004, p=0.027, p=0.040 and p=0.018, respectively). For the sample studied, 2.7% had CVD. Conclusions: The predominant cardiovascular risk factors were overweight, abdominal obesity, generalized obesity, alcoholism and sedentary lifestyle. In men, hypertension and overweight were predominant, and in women, sedentarism and abdominal obesity.Objetivo: investigar a frequência de fatores de risco cardiovascular em  militares da Força Aérea Brasileira em Alcântara, Brasil. Metodologia: estudo transversal retrospectivo foi realizado            com registros clínicos de 240 militares ativos e oriundos de prontuários do Serviço de Arquivo Médico         e Estatístico, e de avaliação nutricional do Setor de Subseção de Nutrição. Foram extraídos os fatores de risco cardiovascular modificáveis (diabetes mellitus - DM, hipertensão arterial sistêmica - HAS, obesidade geral, obesidade abdominal, hipercolesterolemia, hipertrigliceridemia, sedentarismo, tabagismo e etilismo) e não modificáveis (sexo e idade), dados antropométricos e de doenças cardiovasculares (DCV). Estatística descritiva e teste qui-quadrado foi aplicado (a=5%). Resultados: a amostra foi predominantemente de homens (55,8%) e com média de idade de 33 (±8,4) anos. Os fatores de risco  mais prevalentes foram sobrepeso (43,8%), obesidade abdominal (42,9%), obesidade geral (21,3%), etilismo (34,6%) e   sedentarismo (31,3%). Quanto a distribuição dos fatores de risco cardiovascular em relação ao gênero, foi constatada  associação significativa com HAS, sedentarismo, obesidade abdominal e estado nutricional (p=0,004, p=0,027, p=0,040 e p=0,018, respectivamente). Para a amostra, 2,7% apresentavam DCV. Conclusão: os fatores de risco cardiovascular predominantes foram sobrepeso, obesidade abdominal, obesidade geral, etilismo e sedentarismo. Nos homens foi  predominante a hipertensão e o excesso de peso e nas mulheres, o sendentarismo e a obesidade abdominal

Reliability and accuracy of a radiographic analysis method for posterior maxillary mini-implant location

OBJECTIVE: The purpose of this study was to evaluate the reliability and accuracy of a radiographic analysis method for the location of mini-implants inserted in the posterior region of the maxilla. MATERIAL AND METHODS: Two self-drilling mini-implants were installed between the second premolar and the first molar on the right side and left side in three dry skulls. Three operators performed three occlusal radiographs, using an occlusal x-ray film holder, at three different times in each of the three skulls. RESULTS: The interclass correlation coefficient showed a significantly high, positive correlation (

Correlation between the Rotation of the First Molars and the Severity of Class II Division 1 Malocclusion

This study aimed to evaluate the potential correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation of the maxillary first molars. Scanned images of 104 cast models were grouped according to the severity of Class II malocclusion as follows: Group 1, 1/4 Class II malocclusion; Group 2, 1/2 Class II malocclusion; Group 3, 3/4 Class II malocclusion; and Group 4, complete Class II malocclusion. The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively. The correlation was evaluated using the Spearman's correlation coefficient. The rotational indicators were compared using one-way analysis of variance. For all statistical analyses used < 0.05, a positive correlation was observed between the severity of Class II malocclusion and the mesiopalatal rotation of the maxillary first molar. This correlation was statistically significant for indicator 1 between Groups 1 and 3 and for indicator 2 between Groups 1 and 4, which include cases of extreme malocclusion. In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars

Clinical Efficiency of Two Sequences of Orthodontic Wires to Correct Crowding of the Lower Anterior Teeth

This study compared time to correction of mandibular anterior crowding using two arch wire sequences, one with conventional nickel-titanium (NiTi) arch wires and the other with conventional and NiTi heat-activated arch wires. Twenty-two boys and girls (mean age: 16.68 ± 2.66) with moderate crowding (3–6 mm) were assigned randomly to one of two groups and followed up for five months (six assessments) when arch wires were changed. Time to crowding correction was analyzed statistically using the Kaplan-Meier method. Data were collected during the five-month follow-up, and time to correction was compared between groups using the log rank test. At the end of follow-up, mandibular crowding was corrected in 100% of the cases in the group treated with the sequence that included NiTi heat-activated arch wires, whereas about 30% of those treated with NiTi arch wires were not completely corrected. There was a significant difference in time to complete treatment between groups (log rank = 5.996; p<0.05). In the group treated with the sequence that included heat-activated wires, alignment and leveling of mandibular anterior teeth were completed earlier than in the group treated only with conventional NiTi arch wires. Clinical trial registration is found at RBR-7g5zng

Assessment of the aesthetic impact and quality of life of home dental bleaching in adult patients

This study aimed to evaluate the impact of home bleaching with 10% carbamide peroxide on the quality of life and aesthetic perception of patients. A total of 107 patients between 18 and 38 years of age with good oral and general health and at least on

Could sonic delivery of bulk-fill resins improve the bond strength and cure depth in extended size class I cavities?

The implementation of restorative procedures that guarantee success and optimize clinical time is the target of investigations in Restorative Dentistry. This study aimed to analyze the influence of sonic insertion of bulk-fill (BF) and conventional (C) r