Influence of the geometry of the screwdriver-screw connection on the reverse torque of UCLA screws.

The aim of this study was to evaluate the influence of the geometry of the screwdriver-screw connection on the reverse torque of UCLA screws after repeated cycles of tightening and loosening in an implant-supported prosthesis. Thirty sets of external hex titanium implants, UCLA abutments, and UCLA abutment screws were divided into 3 experimental groups (n = 10). In the square group, the implant and UCLA abutment system were mounted in an upright position using a screw with a square screwdriver-screw connection. In the hexagonal group, the implant and UCLA abutment system were mounted in an upright position using a screw with a hexagonal screwdriver-screw connection. In the hexalobular group, the implant and UCLA abutment system were mounted at 70° using a dynamic UCLA abutment and screw with a hexalobular screwdriver-screw connection. Ten alternating torque-reverse torque cycles were applied to each screw using a screwdriver fixed at the end of a digital torque meter. The screws with a square connection resulted in less loss of reverse torque than the other types. Screws with a hexagonal connection showed a statistically significant loss of torque initially but remained constant for the remaining cycles. For the screws with a hexalobular connection, the loss of torque was greater, and substantial deformation of the plastic in the microstructure was noted. The screwdriver-screw connection geometry had a direct influence on the reverse torque of UCLA screws, and the initial reverse torque of the abutment screws with a square connection was greater than that of the hexagonal and hexalobular designs.

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

BACKGROUND: This study aimed to evaluate the impact of home bleaching with 10% carbamide peroxide on the quality of life and aesthetic perception of patients. MATERIAL AND METHODS: A total of 107 patients between 18 and 38 years of age with good oral and general health and at least one anterior tooth in color A2 or darker were selected. Patients who previously underwent any type of bleaching procedures were excluded. All patients received a home bleaching treatment with 10% carbamide peroxide. Before beginning the bleaching treatment, the selected patients responded a form with the Oral Health Impact Profile short form (OHIP-14) and Oral Aesthetic Subjective Impact Scale (OASIS) questionnaire. One month after the bleaching treatment, the patients answered the same questionnaires again. The mean ΔE after bleaching was obtained for the canines and lateral and central incisors. The OHIP-14 and OASIS data were measured for the total sample before and after bleaching using the Wilcoxon signed-rank test with a 5% significance level. RESULTS: The effectiveness of whitening by significant color variation was observed in all groups of teeth with less variation in ΔE for central incisors. Comparing before and after bleaching, there was no significant difference in impact for any of the seven domains and total OHIP-14 scores, although a decrease was observed in the discomfort and psychological disability domains. As for the self-perception of dental aesthetics, measured by the OASIS, there was also no significant difference for all the items evaluated; however, it was possible to observe an increase in "concern with dental appearance" after bleaching. CONCLUSIONS: Home bleaching with 10% carbamide peroxide did not have a significant impact on patients' quality of life and aesthetic perception, although there was a decrease in the domain of psychological discomfort and an increase in concerns about dental appearance. Key words:Tooth Bleaching, quality of life, self-perception, dental aesthetics.

Avaliação do impacto do clareamento dental na qualidade de vida de pacientes adultos / Evaluation of the impact of dental bleaching on the quality of life of adult patients / Evaluación del impacto del blanqueamiento dental en la calidad de vida de pacientes adultos

Objetivo: este trabalho teve como objetivo avaliar o impacto do clareamento dental profissional na qualidade de vida de pacientes. Método: foram selecionados 40 pacientes em tratamento de clareamento dental de consultório com peróxido de hidrogênio a 35%, e que atenderam a critérios específicos de inclusão e exclusão. Para determinar o impacto do clareamento dental na qualidade de vida dos pacientes, foi aplicado o questionário OHIP-14, contendo 14 perguntas divididas em 7 domínios avaliando os aspectos: limitação funcional, dor física, desconforto psicológico, incapacidade física, incapacidade psicológica, incapacidade social e desvantagem social, antes do inicio e 30 dias após finalizado o clareamento dental. Resultados: os escore total do Ohip-14 e dos domínios foram comparados nos dois momentos (antes e após o clareamento), por meio do teste de Wilcoxon, que não mostrou diferencia significante (p<0.05%), para todos os domínios, com exceção do domínio desconforto psicológico no qual foi observado uma diminuição de impacto após o procedimento clareador. Conclusão: o OHIP 14 mostrou que o procedimento clareador favorece a estética dos indivíduos, melhorando sua qualidade de vida e, diminuindo assim, o estresse frente aos impactos psicológicos em sociedade.(AU)

Objective: this study aimed to evaluate the impact of professional tooth bleaching on patients' quality of life. Methods: a total of 40 patients were selected in the treatment of office tooth bleaching with 35% hydrogen peroxide, which met specific inclusion and exclusion criteria. To determine the impact of dental bleaching on patients' quality of life, the OHIP-14 questionnaire was used, containing 14 questions divided into 7 domains assessing aspects: functional limitation, physical pain, psychological discomfort, physical incapacity, psychological incapacity, social incapacity and social disadvantage, before the beginning and 30 days after dental bleaching was completed. Results: the total Ohip-14 score and domains were compared at both time points (before and after bleaching) using the Wilcoxon test, which showed no significant difference (p <0.05%) for all domains, except for the psychological discomfort domain in which a reduction in impact was observed after the bleaching procedure. Conclusion: OHIP-14 showed that the bleaching procedure favors the aesthetics of individuals, improving their quality of life, thus reducing the stress on the psychological impacts on society.(AU)

Objetivo: este trabajo tuvo como objetivo evaluar el impacto del blanqueamiento dental profesional en la calidad de vida de pacientes. Métodos: se seleccionaron 40 pacientes en tratamiento de blanqueamiento dental de consultorio con peróxido de hidrógeno al 35%, y que atendieron a criterios específicos de inclusión y exclusión. Para determinar el impacto del blanqueamiento dental en la calidad de vida de los pacientes, se aplicó el cuestionario OHIP-14, conteniendo 14 preguntas divididas en 7 áreas evaluando los aspectos: limitación funcional, dolor físico, incomodidad psicológica, incapacidad física, incapacidad psicológica, incapacidad social y desventaja social, antes del inicio y 30 días después de finalizado el blanqueamiento dental. Resultados: los puntajes totales del Ohip-14 y de los dominios fueron comparados en los dos momentos (antes y después del blanqueamiento), por medio de la prueba de Wilcoxon, que no mostró diferencia significante (p <0.05%), para todos los dominios, excepción del dominio de incomodidad psicológica donde se observó una disminución de impacto después del procedimiento blanqueador. Conclusión: el OHIP-14 mostró que el procedimiento blanqueador, favorece la estética de los individuos mejorando, su calidad de vida disminuyendo así el estrés frente a los impactos psicológicos en sociedad.(AU)

Association between Tooth Loss and Degree of Temporomandibular Disorders: A Comparative Study.

OBJECTIVE: The aim of this study was to evaluate the association between tooth loss and the signs and symptoms of temporomandibular disorders (TMDs). MATERIALS AND METHODS: One hundred fifty patients with an average age of 49.2 (±14.06) years were divided into three groups (n = 50/group) according to the degree of tooth loss: GI (dentate -control), GII (edentulous), GIII (partially dentate). After performing anamnesis and clinical examination, a questionnaire was used, so that the patients could fill in information on signs and symptoms of TMD. After analyzing this information, it was possible to classify the degree of severity of TMD. As age is a confounding variable to the level of TMD, an analysis of covariance (ANCOVA) was used to check for differences in the degree of TMD between groups (covariate = age). A post hoc test (Bonferroni) was performed to compare the groups two by two (5% significance level). RESULTS: The mean level of TMD according to the groups was GI - 1.95; GII - 2.15; GIII - 2.55. There were significant differences between the study groups (p > 0.05). A post hoc test (Bonferroni) confirmed the difference between edentulous patients and the other groups. CONCLUSION: The tooth loss is directly related to the signs and symptoms of TMD. The degree of TMD was significantly higher in edentulous patients.

Aspectos odontológicos a serem considerados para o tratamento de portadores da doença de Alzheimer / Dental issues to be considered on the treatment of patients with AlzheimerÆs disease

A doença de Alzheimer é uma doença neurodegenerativa que provoca o declínio das funções intelectuais, reduzindo as capacidades de trabalho e relação social, interferindo no comportamento e personalidade do indivíduo. O objetivo deste estudo foi analisar os aspectos relativos às necessidades odontológicas dos pacientes idosos portadores de Alzheimer. Para tanto, foi realizada uma revisão de literatura utilizando as bases de dados, em que os resultados foram divididos em dois tópicos: considerações relativas ao tratamento odontológico e alterações bucais frequentes em pacientes com doença de Alzheimer. Concluiu-se que o cirurgião dentista deve conhecer as características dos pacientes com doença de Alzheimer planejando o tratamento mais adequado, e orientando a equipe de saúde, cuidadores e familiares a fim de ser obter sucesso na implementação de medidas preventivas e curativas...

Alzheimer disease is a neurodegenerative disease that causes the decline of intellectual functions, reducing the capacity for work and social relationships, interfering with the behavior and personality of the individual. The aim of this study was to analyze factors related to dental needs of elderly patients with AlzheimerÆs. Therefore, it was conducted a literature review and the results were divided into two topics: considerations about dental treatment and frequent buccal alterations in patients with AlzheimerÆs. It was concluded that it is important that the dentist knows the characteristics of patients with degenerative diseases in order to develop proper treatment planning, and guide caregivers and family in order to achieve successful adoption of preventive and healing measures...

An harmonic smile resulted from the use of ceramic prosthesis with zirconia structure: a case report.

The rehabilitation of patients requiring an esthetic smile demands a multidisciplinary approach. This clinical report describes a treatment plan for recovery aesthetics' smile of anterior teeth using ceramic prosthesis with zirconia structure. Initially, a review of aesthetic parameters, diagnostic waxing, mock-up and provisional restorations was performed. A contextual assessment of aesthetic, proportion and shape of teeth was done to recreate a natural looking for teeth in consonance with the smile line. Subsequently, based on these parameters, fixed prostheses of the upper anterior teeth using ceramic restorations with zirconia infrastructures were performed. The use of ceramic restorations with zirconia structures associated with a careful treatment plan allows the professional to integrate esthetic and function for satisfactory clinical results. How to cite the article: Tavarez RR, Gonçalves LM, Dias AP, Dias AC, Malheiros AS, Silva AC, Bandeca MC. An harmonic smile resulted from the use of ceramic prosthesis with zirconia structure: A case report. J Int Oral Health 2014;6(3):90-2.

Overlays or ceramic fragments for tooth restoration: an analysis of fracture resistance.

PURPOSE: The aim of this study was to evaluate the mode of fracture and resistance of partial ceramic restorations of posterior teeth. MATERIALS AND METHODS: Thirty healthy upper premolars were selected and divided into three groups (n = 10): Group 1- control, healthy unrestored teeth, group 2-teeth restored with ceramic fragments; and group 3-teeth restored with ceramic overlays. The restorations were manufactured with feldspathic ceramic and cemented with RelyX ARC resin cement. After being stored in distilled water for 7 days, the teeth were subjected to axial compression mechanical testing with a universal testing machine. Force was applied to the long axis of the tooth at a speed of 0.5 mm/min until fracture. The data were analyzed with one-way ANOVA and Tukey's test (5%). The mode of fracture was scored according to the degree of involvement of the tooth structure and the type of restoration. RESULTS: A significant difference (p < 0.05) was showed between groups 2 (1155 N) and 3 (846.6 N), but there was no significant difference between group 1 and the other groups (1046 N), More extensive fractures were prevalent in the healthy teeth group (Group 1), which had no occlusal coverage; less severe fractures were found in groups 2 and 3. CONCLUSION: We conclude that teeth restored with ceramic fragments may offer greater resistance to fractures compared to teeth that have overlay restorations.

Alinhamento dental por meio de faceta cerâmica - relato de caso / Dental alignment using ceramics veneers - case report

Dentes em uma correta posição e com um adequado contorno gengival são peças-chaves para a obtenção da harmonia e estética do sorriso. Em pacientes com mau posicionamento dentário e necessidade de recuperação estética, um planejamento multidisciplinar com a interrelação entre tratamento ortodôntico e reabilitador permite a recuperação da estética. Mas devido ao tempo de tratamento, idade e tipo de paciente, em muitas ocasiões nos vemos impossibilitados a planejar e executar o tratamento ortodôntico. Assim procuram-se alternativas que permitam a recuperação estética do paciente. Este trabalho apresenta a descrição de um caso clínico com abordagem estética, onde devido a impossibilidade de realização de tratamento ortodôntico optou-se pela recuperação do alinhamento dental utilizando-se facetas cerâmicas. Conclui-se que com um correto planejamento e a técnica utilizada ‚ possível recuperar a estética e harmonia do sorriso

Precisely positioned teeth and proper gingival contour are fundamental aspects to achieve an aesthetically harmonious smile. In patients with poor dental alignment orthodontic and rehabilitation treatments allow aesthetic improvement. However, sometimes it is not possible to plan and execute the orthodontic treatment due to the time of treatment, age of the patient and other particularities. Thus we search for alternatives that allow the recovery of the patient aesthetics. This paper presents the description of a clinical case with aesthetic approach in which the recovery of dental alignment was performed using ceramic veneers since an orthodontic treatment wasn’t possible. It was concluded that with proper planning and the utilized technique it is possible to recover aesthetics and harmony of the smile

Atraumatic extraction, implant placement and immediate provisionalization.

Front tooth extraction typically results in significant loss of hard and soft tissue volume, both in the vestibular-lingual and mesiodistal directions. As these changes can compromise the esthetic results of prosthetic rehabilitation, extraction techniques that cause minimal trauma to the remnant tissues are applied in combination with immediate implant placement to minimize such alterations. The case reported in the present article illustrates a therapeutic plan consisting of atraumatic extraction followed by immediate implant placement and provisionalization. When carefully indicated and planned, our results indicate that this technique may provide promising immediate results relative to the maintenance and stability of the peri-implanted tissues.

Preoperative gingival conditioning as a guide for implant installation and to achieve proper dentogingival contours.

A successful esthetic outcome for implant-supported dentures depends on the careful manipulation of peri-implant tissue as well as the precise placement of the implant. In addition, careful surgical and prosthetic planning is essential for esthetically important areas, especially in partially edentulous cases. This study describes a clinical case that presented absent maxillary central incisors in which prior prosthetic planning was used to perform provisional restorations, that was used to condition the gingival tissues and guide implant installation. These procedures made it possible to achieve a dentogingival contour, interdental papillae, and an emergence profile in the edentulous area. The techniques outlined here proved to be sufficient and support the peri-implant tissues to create a more esthetic final prosthesis.

Prevalência e gravidade de disfunção temporomandibular em professores do ensino superior / Temporomandibular disorder and severity in university professors

BACKGROUND AND OBJECTIVES: University professors are part of a category of professionals constantly submitted to stress, which may trigger a temporomandibular disorder (TMD). By recognizing this relationship, this study aimed at evaluating the prevalence and severity of TMD in university professors. METHODS: A sample of 200 individuals of both genders, above 25 years of age, who were still not diagnosed with TMD, was divided in two groups: Group I, made up of university professors, and Group II made up of individuals of any other professional activity, different from teaching. Volunteers were asked to fill a historical questionnaire which allowed a classification of the presence and severity of TMD. RESULTS: Participated in this study 95 males and 105 females. With regard to TMD severity in Group I, it was observed that 62.7% of evaluated individuals were classified as having mild TMD; 25.3% as having moderate TMD; and 12% as having severe TMD. In Group II, 73.9% had mild TMD; 24.6% had moderate TMD; and 1.4% had severe TMD. CONCLUSION: The prevalence of TMD among professors was not different from the group of non professors. When professors had TMD, the level severity was higher as compared to non professors.

JUSTIFICATIVA E OBJETIVOS: O professor de ensino superior faz parte de uma categoria de profissionais que é submetida constantemente a estresse, podendo desencadear uma disfunção temporomandibular (DTM). Ao reconhecer essa relação, este trabalho teve como objetivo avaliar a prevalência e grau de gravidade de DTM em professores de ensino superior. MÉTODOS: Uma amostra de 200 indivíduos, de ambos os gêneros, maiores de 25 anos, que ainda não tinham diagnóstico de DTM, foi dividida em dois grupos: o Grupo I, formado por indivíduos que exerciam a profissão de professor de ensino superior e o Grupo II, formado por indivíduos que exerciam qualquer outra atividade profissional desvinculada da docência. Aos voluntários, foi solicitado o preenchimento de um questionário anamnésico que permitiu estabelecer uma classificação em relação à presença e ao grau de gravidade da DTM. RESULTADOS: Foram avaliados 95 homens e 105 mulheres. Em relação ao grau de gravidade de DTM no Grupo I, detectou-se que 62,7% dos avaliados foram classificados como portadores de DTM leve; 25,3% como portadores de DTM moderada; e 12% como portadores de DTM grave. No Grupo II, constatou-se que 73,9% como portadores de DTM leve; 24,6% DTM como portadores de DTM moderada; e 1,4% como portadores de DTM grave. CONCLUSÃO: A prevalência de DTM em professores não foi diferente da encontrada no grupo de não professores; quando professores foram acometidos por DTM, o grau de gravidade foi maior quando comparado com o grupo de não professores.

Torque aplicado de forma manual em diferentes tipos de parafusos utilizados em próteses implantossuportadas / Torque produced by hand in different types of screws used in implant prostheses

Este estudo teve por objetivo avaliar in vitro a quantidade de torque manual gerada por profissionais de diferentes gêneros em parafusos utilizados em próteses implantossuportadas. Um manequim odontológico foi usado para simular uma condição clínica. Quatro implantes osseointegrados foram instalados na área de primeiro e segundo molar inferior direito e esquerdo. Dez profissionais participaram do estudo sendo que aos mesmos foi solicitado aplicar o torque máximo a quatro tipos de parafusos diferentes (Parafusos UCLA de titânio, UCLA de ouro, de retenção de ouro e esteticone). Após o torque aplicado, foi medido o destorque que foi considerado como o torque gerado. Cada participante realizou este procedimento três vezes em cada parafuso, com intervalo de tempo de 1 minuto. Os resultados encontrados mostraram diferenças significativas entre os profissionais, mas não entre o gênero masculino e feminino. Concluiu-se que quando o torque é aplicado de forma manual espera-se uma variabilidade na quantidade de torque gerada, mas não existindo diferenças estatisticamente significantes entre profissionais de diferentes gêneros

This study aimed to evaluate in vitro the amount of torque generated manually by professionals from different genres in different types of screws used in implant prosthesis. A dental mannequin was used to simulate a clinical condition. Four dental implants were attached in the area of the first and second molar right and left. Ten professionals have participated, and were asked to apply the maximum torque to four different types of screw (titanium and gold screws UCLA, gold retention screw and esteticone). After applying the torque, detorque was measured and considered as generated torque. Each professional has performed this procedure three times with each screw with one minute interval. Results have shown significant differences among professionals, but not between males and females. Therefore it was concluded that when torque is applied manually a variability in the quantity of generated torque is expected, but with no significant differences between professionals from different genres

Atraumatic extraction and immediate implant installation: The importance of maintaining the contour gingival tissues.

There is an accelerated resorption in the first six months after the extraction of the dental element, both horizontally and vertically. These clinical changes normally undertake the aesthetic result of prosthetic rehabilitation, and implant installation after the extraction can be a resource to decrease resorption. The clinical case described in this paper demonstrates a sequence of clinical atraumatic extraction, and then the Immediate installation provisionalization. It is concluded that when carefully indicated and planned, this technique can provide an immediate result promising with maintaining the tooth gingival contour. How to cite this article: Tavarez RR, Machado dos Reis WL, Rocha AT, Firoozmand LM, Bandéca MC, Tonetto MR, Malheiros AS. Atraumatic extraction and immediate implant installation: The importance of maintaining the contour gingival tissues. J Int Oral Health 2013; 5(6):113-8 .

Remodelação do contorno gengival como forma de otimizar o resultado estético de próteses fixas anteriores / Gingiva contour remodeling as a way to improve aesthetics results of anterior fixed prosthesis

A harmonia dento gengival é fundamental na estética do sorriso. Reabilitações protéticas dos dentes anteriores precisam de uma avaliação cuidadosa do arco côncavo gengival, presença de papilas interdentárias, espessura das áreas de pônticos, assim como do zênite gengival. Este trabalho apresenta a descrição de um caso clínico com abordagem estética multidisciplinar onde foi recuperada a espessura da área de pôntico a partir de cirurgia de enxerto gengival livre. Posteriormente realizado condicionamento dessa área, usou-se como guia as restaurações provisórias para obtenção do arco côncavo gengival em harmonia com os dentes. Associado a isto, foram confeccionadas restaurações cerâmicas com infraestruturas em zircônia, tendo como guia as restaurações provisórias e aplicação dos princípios estéticos

The harmony is fundamental in dento gingival smile esthetics. Prosthetic rehabilitation of anterior teeth requires careful evaluation of gingival concave arc, the presence of interdental papillae, thick areas of pontics and the gingival zenith. This paper presents the description of a clinical case with aesthetic multidisciplinary approach where the thickness was recovered from the area of the pontic from free gingival graft surgery. Later gingival conditional, used as a guide the provisional restorations for obtaining gingival concave arc in harmony with his teeth. Additionally, were fabricated ceramic restorations with zirconia infrastructures, guided the temporary restorations and application of aesthetic principles

Prótese fixa associada à PPR com encaixe extracoronário uma alternativa de planejamento em reabilitação oral / Fixed prosthesis associated with RPD extracoronal attachment an alternative planning in oral rehabilitation

Atualmente as próteses implantossuportadas são a primeira alternativa de tratamento na reabilitação de arcos desdentados parciais ou totais, porém muitas vezes, existem limitações de ordem anatômica, sistêmica ou econômica que impossibilitam esse tipo de tratamento. Um recurso que pode ser considerado, quando não é possível este tipo de tratamento é o uso de próteses fixas conjugadas a PPR com encaixes (attachments). Esses são componentes alternativos aos grampos convencionais e sua indicação é baseada nas particularidades de cada caso e na disponibilidade, normalmente os encaixes rígidos são indicados para casos próteses conjugadas dentossuportadas enquanto que os semirígidos ou resilientes para os casos de extremidades livres. Com base nessas considerações o presente trabalho tem como objetivo apresentar dois casos clínicos de reabilitação com PPR retida por encaixes resilientes de semiprecisão associados à prótese fixa. Obteve-se resultados satisfatórios, quanto a estética e funcionalidade, destacando-se a importância de um bom planejamento para o sucesso do tratamento

Currently implant supported prostheses are the first choice of treatment in rehabilitation of partially or totally edentulous arches, but there are often limitations in anatomic, systemic or economic precluding this type of treatment. One feature that may be considered when this kind of treatment is not possible the use of bridges combined with the RPD attachments. These components are alternatives to conventional clips and its indication is based on the particularities of each case and the availability, attachments normally rigid prostheses are indicated for cases combined dental-supported while the semi rigid or resilient to the cases of free ends. Based on these considerations this paper aims to present a case of rehabilitation with RPDs retained by resilient attachments for semi precision associated with the fixed prosthesis. We obtained satisfactory results, as the aesthetics and functionality, highlighting the importance of good planningfor successful treatment