Influence of diameter in the stress distribution of extra-short dental implants under axial and oblique load: a finite element analysis

Aim: This study evaluated the influence of a wide diameter on extra-short dental implant stress distribution as a retainer for single implant-supported crowns in the atrophic mandible posterior region under axial and oblique load. Methods: Four 3D digital casts of an atrophic mandible, with a single implant-retained crown with a 3:1 crown-to-implant ratio, were created for finite element analysis. The implant diameter used was either 4 mm (regular) or 6 mm (wide), both with 5 mm length. A 200 N axial or 30º oblique load was applied to the mandibular right first molar occlusal surface. The equivalent von Mises stress was recorded for the abutment and implant, minimum principal stress, and maximum shear stress for cortical and cancellous bone. Results: Oblique load increased the stress in all components when compared to axial load. Wide diameter implants showed a decrease of von Mises stress around 40% in both load directions at the implant, and an increase of at least 3.6% at the abutment. Wide diameter implants exhibited better results for cancellous bone in both angulations. However, in the cortical bone, the minimum principal stress was at least 66% greater for wide than regular diameter implants, and the maximum shear stress was more than 100% greater. Conclusion: Extra-short dental implants with wide diameter result in better biomechanical behavior for the implant, but the implications of a potential risk of overloading the cortical bone and bone loss over time, mainly under oblique load, should be investigated

Zygomatic implants in intra-sinus versus extra-maxillary approaches for prosthetic rehabilitation in severely atrophic maxillae: finite element analysis / Implantes cigomáticos en abordajes intra sinusal versus extra maxilar para rehabilitación protésica en maxilares severamente atróficos: análisis de elementos finitos

Objetive: To compare the stresses and deformations generated on the surrounding bone of the zygomatic implants when using an intra sinusal and extra-maxillary approach, through the finite element method. Material and Methods: Computer aided designs (CADs) were constructed using SolidWorks Software of a skull with bone resorption to be rehabilitated through a fixed hybrid prosthesis using two zygomatic and two conventional straight implants. For the boundary conditions (load conditions), symmetry in the sagittal plane was assumed and that all the materials were isotropic, homogeneous and linearly elastic. Two zygomatic implantation techniques were simulated: intra sinusal (Is) and extra maxillary (Em). Vertical and lateral loads of 150 N and 50 N were applied to the finite element models to obtain Von Mises equivalent stress and strain (displacement). Results: The average measurement of the Von Mises stress (MPa) recorded were as follows: Approach of the implant body (Is: 0.24- Em: 0.28,) effort of implant body with vertical load: Is: 0.69 - Em: 0.96; effort of peri-implant surface under horizontal load: Is: 2.11 - Em: 0.94. Average displacement under vertical load of peri-implant surface Is: 0.35 - Em: 0.40, and of implant body Is: 1.34 - Em: 2.04. Average total deformation in approach Is: 2.23 mm - Em: 0.80mm, and average total deformation in the implant body under horizontal load was Is: 0.14 - Em: 0.21. Conclusion: The results of this study indicate that despite the differences that occurred in both stress and strain (displacement) between the intra-sinus and extra-maxillary approaches, the static strength of the bone, which is approximately 150 MPa in tension and 250 MPa in compression was not exceeded. Considering the limitations of finite element analysis, there seems to be no biomechanical reason to choose one approach over the other.

Objetivo: Comparar por el método de elementos finitos los esfuerzos y deformaciones generados sobre el hueso circundante de implantes cigomáticos tratados con un abordaje intra sinusal y extra maxilar. Material y Métodos: Se construyeron los diseños asistidos por computadora (CAD) utilizando el Software SolidWorks de un cráneo con una reabsorción ósea para ser rehabilitado, a través de una prótesis híbrida fija, mediante dos implantes cigomáticos y dos rectos convencionales. Para las condiciones de frontera (condiciones de carga) se asumió simetría en el plano sagital y que todos los materiales eran isotrópicos, homogéneos y linealmente elásticos. Se simularon dos técnicas de implantación cigomática: una intra sinusal (Is) y otra extra maxilar (Em). Se aplicaron cargas verticales y laterales de 150 N y 50 N a los modelos de elementos finitos para obtener el esfuerzo equivalente de Von mises y la deformación (desplazamiento). Resultados: La medición promedio del esfuerzo de Von Mises (MPa) registró: abordaje del cuerpo de implante (Is: 0.24-Em: 0.28) esfuerzo del cuerpo de implante con carga vertical: (Is:0.69 ­ Em: 0.96); esfuerzo de la superficie peri implantar ante carga horizontal (lateral):( Is:2.11 ­ Em:0.94). Desplazamiento promedio ante carga vertical de la superficie peri implantar (Is:0.35 ­ Em:0.40) y del cuerpo del implante (Is:1.34 ­ Em:2.04). Deformación total promedio en mm en abordaje (Is: 2.23 ­ Em:0.80) y deformación total promedio en el cuerpo del implante ante carga horizontal (Is:0.14 ­ Em:0.21). Conclusión: Los resultados de este estudio indican que a pesar de las diferencias que se presentaron tanto en el esfuerzo como en la deformación (desplazamiento) entre los abordajes intra sinusal y extra maxilar, la resistencia estática del hueso, que es de aproximadamente 150 MPa en tensión y 250 MPa en compresión no se superó. Considerando las limitaciones de los AEF, parece no haber razones biomecánicas para elegir uno u otro enfoque.

Concept of functional dentition and impact on the quality of life of partially edentulous patients / Concepto dentición funcional e impacto en la calidad de vida de los pacientes desdentados parciales

Main Objective: To compare, through the OHIP-7Sp, the impact on the quality of life of partially edentulous patients, according to WHO criteria "with functional dentition", 21 or more teeth and "without functional dentition", less than 21 teeth. Material and Methods: 97 partially edentulous patients were selected between 35 and 75 years old, ASA I or II with ≤ 28 teeth remaining. Were divided in two groups, non-functional dentition (NFD) n=47 and functional dentition (FD) n=50. OHIP-7Sp survey was applied to each patient to measure the impact on quality of life in the seven dimensions considered in this survey. The scale of measurement ranges from 0 to 4, in which 0 is "never" and 4 "always", with a maximum value of 28, considering the instrument in its entirety. Highest score indicates a greater impact on quality of life. For comparison of both groups, the non-parametric Mann-Whitney test was used with a level of 95% significance. Results: Concerning all patients evaluated through the OHIP-7Sp, the mean age was 53 years. There were significant differences in the total OHIP-7Sp score, with a mean and median for the NFD group of 9.53 and 9 and for the FD group 5.02 and 5, respectively. Disaggregating the analysis, significant differences emerged in dimensions 2, 3, 4, 5, and 6 (p<0.05). Conclusion: There was a significantly greater impact on the quality of life, measured with the OHIP-7Sp, in the NFD group compared to the FD group.

Objetivo Principal: Comparar mediante el OHIP-7Sp, el impacto en la calidad de vida de pacientes desdentados parciales, según criterio OMS "con dentición funcional", 21 o más dientes y "sin dentición funcional", menos de 21 dientes. 0 Material y Métodos: Fueron seleccionados 97 pacientes desdentados parciales entre 35 y 75 años, ASA I o II con remanencia de ≤ 28 dientes. Fueron divididos en 2 grupos, dentición no funcional (DNF) n=47 y dentición funcional (DF) n=50. Se aplicó encuesta OHIP-7Sp a cada paciente para medir el impacto en la calidad de vida en las 7 dimensiones que contempla esta encuesta. La escala de medición, abarca de 0 a 4, en la cual 0 es "nunca" y 4 "siempre", con un valor máximo de 28, considerado el instrumento en su totalidad. El puntaje más alto indica un mayor impacto en la calidad de vida. Para la comparación de ambos grupos se utilizó el test no paramétrico de Mann-Whitney con un nivel de significancia del 95%. Resultados: Del total de pacientes evaluados mediante el OHIP-7Sp, el promedio de edad fue de 53 años. Hubo diferencias significativas en el puntaje del OHIP-7Sp total, con una media y mediana para el grupo DNF de 9,53 y 9 y para el grupo DF de 5,02 y 5, respectivamente. Desagregando el análisis, emergieron diferencias significativas en las dimensiones 2, 3, 4, 5, y 6 (p<0,05). Conclusión: Hubo significativamente mayor impacto en la calidad de vida, medido con el OHIP-7Sp, en el grupo DNF comparado con el grupo DF.

Rehabilitation of atrophic posterior partial edentulous maxilla with TTPHIL ALL TILT® technique: 3 year follow-up case report / Reabilitação de maxila atrófica posterior parcialmente desdentada com técnica TTPHIL ALL TILT®: relato de caso de acompanhamento de 3 anos

Maxillary sinus pneumatisation pose a grave clinical challenge for implant fixed rehabilitation in posterior maxilla owing to diminished bone volume. This necessitates sinus lift and grafting which increase the duration and cost and possible surgical complications. Pterygoid implant has a greater short term osseointegration and is a proven treatment method for rehabilitation of highly resorbed posterior maxilla. To overcome the limitations of sinus grafting techniques, the current case report describes the use of flapless, tilted and pterygoid implant for restoration of partially edentulous atrophic maxilla eliminating grafting (AU).

A pneumatização do seio maxilar representa um grande desafio clínico para a reabilitação fixa por implante na região posterior da maxila devido ao volume ósseo diminuído. Isso requer elevação do seio e enxerto, fatores que aumentam a duração, o custo e as possíveis complicações cirúrgicas. O implante pterigóide tem uma osseointegração maior em curto prazo e é um método de tratamento comprovado para reabilitação de maxila posterior altamente reabsorvida. Para superar as limitações das técnicas de enxerto de seio, o relato de caso atual descreve o uso de implante sem retalho, inclinado e pterigóide para restauração de maxila atrófica parcialmente edêntula eliminando o enxerto.(AU)

Atención odontológica humanizada a un paciente con neurofibromatosis tipo 1 atendido en una clínica de odontología de especialización infantil: reporte de Caso / Humanized dental care for a patient with type 1 neurofibromatosis attended in a specialized children's dentistry clinic: case report / Atendimento odontológico humanizado a paciente com neurofibromatose tipo 1 atendido em ambulatório especializado de odontologia infantil: relato de caso

Este trabajo tiene como objetivo relatar el abordaje individualizado, inclusivo y humanizado de un niño de 4 años y tres meses, con diagnóstico de neurofibromatosis tipo 1, atendido en la Carrera de Especialización en Odontopediatría de la Escuela de Graduados, Facultad de Odontología, Universidad de la Repú blica, Montevideo, Uruguay. En el examen clínico se pudo observar cicatrices derivadas del tratamiento quirúrgico del neurofibroma plexiforme en la zona cervical y la presencia de hipotonicidad muscular oral. Al examen clínico intraoral, se observaron amplias zonas desdentadas a consecuencia de exodoncias de quince dientes deciduos. Presentaba lesiones activas de caries en los dientes remanentes, acompañado de biopelícula generalizada y sangrado gingival provocado. Se realizó un abordaje integral del paciente y la terapia rehabilitadora mediante el uso de prótesis parcial removible superior e inferior. Concluímos que el tratamiento odontológico educativo, preventivo, restaurador y rehabilitador fue satisfactorio y la empatía, como proceso dinámico, involucró mecanismos cognitivos, afectivos y conductuales, y fue reconocida por sus efectos positivos en la promoción de la salud bucal del paciente.

Este trabalho tem como objetivo relatar uma abordagem odontológica individualizada, inclusiva e humanizada, enfatizando a importância do tratamento de uma criança de 4 anos e três meses, com diagnóstico de neurofibromatose tipo 1, que foi encaminhada e tratada en la clínica de la Carrera de Especialización en Odontopediatria de la Escuela de Graduados, Facultad de Odontología, Universidad de la República. O exame clínico revelou cicatrizes decorrentes do tratamento cirúrgico do neurofibroma plexiforme que acometia o pescoço da criança e hipotonicidade muscular oral. Ao exame clínico intraoral, quinze dentes decíduos estavam ausentes e cinco com lesões de cárie na primeira infância, além de presença generalizada de biofilme microbiano nas superfícies dentais e sangramento gengival provocado. Foi realizado tratamento odontológico necessário ao paciente, com os devidos cuidados e terapia reabilitadora com prótese parcial removível superior e inferior. Concluímos que o tratamento odontológico educacional, preventivo, restaurador e reabilitador foi satisfatório e a empatia, como processo dinâmico, envolveu mecanismos cognitivos, afetivos e comportamentais e foi reconhecida por seus efeitos positivos na promoção da saúde bucal do paciente.

This paper aims to report an individualized, inclusive, and humanized dental approach, emphasizing the importance of treating a child aged four years and three months with neurofibromatosis type 1. The patient was referred and treated at the Clinic of the Specialization Course in Pediatric Dentistry of the Graduate School, School of Dentistry, Universidad de la República, Montevideo, Uruguay. The clinical examination revealed scars from the surgical treatment of the plexiform neurofibroma and neck and oral muscle hypotonicity. The intraoral clinical examination showed large edentulous areas as 15 deciduous teeth were missing. The patient had active carious lesions, generalized microbial biofilm on the tooth surfaces, and gingival bleeding. A comprehensive treatment was provided, as well as restorative therapy with upper and lower removable partial dentures. We conclude that the dental educational, preventive, restorative, and rehabilitation treatment was satisfactory. Furthermore, empathy, as a dynamic process, involved cognitive, affective, and behavioral mechanisms. It also helped enhance the patient's oral health.

Estudio de trastornos temporomandibulares en pacientes parcialmente desdentados / A study of temporomandibular disorders in partially edentulous patients

El objetivo de este estudio es determinar la frecuencia y características del edentulismo parcial y patologías de la articulación temporomandibular en pacientes adultos. Se realizó un estudio observacional y descriptivo de pacientes que concurrieron al Módulo de Odontología Rehabilitadora de la Facultad de Odontología, se seleccionaron 60 pacientes que necesitaban rehabilitación protésica parcial. Las variables estudiadas fueron: edad, sexo, clase de Kennedy, dolor articular, ruidos articulares, restricción y desviación mandibulares. Los datos fueron cargados en una base de datos diseñada a tal efecto, para su análisis estadístico. Del análisis del estudio se observó ausencia parcial de piezas dentarias con mayor frecuencia en el sexo femenino (58%), el 52% correspondieron a la clase I de Kennedy: el 64% en el maxilar inferior, el 17% presentó dolor articular, 28% ruidos articulares, 68% presentó desviación mandibular (siendo lo más frecuente hacia la derecha), y el 42% presentó restricción mandibular leve y solo un n=1, grave. Las pérdidas de las piezas dentarias bilaterales posteriores del maxilar inferior son las de mayor frecuencia asociado a patologías frecuentes del ATM. Partiendo desde la prevención, evitando las pérdidas de piezas dentarias y con una correcta rehabilitación se podrá lograr una buena salud bucodental (AU)

The objective of this study is to determine the frequency and characteristics of partial edentulism and pathologies of the temporomandibular joint in adult patients. An observational and descriptive study of patients who attended the Rehabilitation Dentistry Module of the Faculty of Dentistry was carried out; 60 patients who needed partial prosthetic rehabilitation were selected. The variables studied were age, sex, Kennedy class, joint pain, joint noises, mandibular restriction, and mandibular deviation. The data were loaded into a database designed for this purpose, for statistical analysis. From the analysis of the study, partial absence of teeth was observed with greater frequency in females (58%), 52% corresponded to Kennedy Class I: 64% in the lower jaw, 17% presented joint pain, 28 % joint noises, 68% presented mandibular deviation being the most frequent to the right, 42% presented mild mandibular restriction and only one n = 1 severe. Loss of the posterior bilateral teeth of the lower jaw are the most frequent associated with frequent TMJ pathologies. Starting from prevention, avoiding the loss of teeth and with correct rehabilitation, good oral health can be achieved (AU)

Morbilidad en ancianos con pérdida dentaria / Morbidity in elderly with dental loss

Introducción: La pérdida dentaria tiene consecuencias en la apariencia y en la función fisiológica general del adulto mayor, lo cual constituye un problema aún no resuelto en la República Bolivariana de Venezuela. Objetivo: Describir la morbilidad en adultos mayores con pérdida de dientes permanentes. Método: Se realizó un estudio descriptivo, observacional y de corte transversal en la Clínica Simón Bolívar del municipio de Diego Ibarra, perteneciente al estado venezolano de Carabobo, desde enero hasta junio del 2016. El universo estuvo constituido por 100 adultos mayores de 60 años y más, ambos sexos y desdentados parciales o totales. Las variables analizadas fueron edad, sexo, higiene bucal, número de dientes permanentes perdidos, así como el tipo de aparatología protésica requerida. Se emplearon las frecuencias relativa y absoluta como medidas de resumen. Resultados: Se encontró que 73,0 % de los ancianos perdieron sus dientes por caries dental, siendo las féminas y el grupo de 60-64 años de edad el más afectado. Asimismo, predominaron la higiene bucal deficiente y la necesidad de prótesis parcial. Conclusiones: Existió una elevada morbilidad en los adultos mayores con pérdida dentaria, lo cual afectó su funcionalidad, estética y autoestima, que de no ser corregida pudiera provocar consecuencias importantes en la cavidad bucal y en el resto del cuerpo, sin olvidar la prevención o detección precoz de cualquier otra enfermedad bucal que la genere.

Introduction: Dental loss has consequences in the elderly general physiologic function and appearance, that constitutes an unsolved problem in the Bolivian Republic of Venezuela. Objective: To describe the morbidity in elderly with loss of permanent teeth. Method: A descriptive, observational and cross-sectional study was carried out in Simón Bolívar Clinic from Diego Ibarra municipality, belonging to Carabobo in Venezuela, from January to June, 2016. The universe was constituted by 100 elderly of 60 years and more from both sexes and partially or totally toothless. The analyzed variables were age, sex, oral hygiene, number of lost permanent teeth, as well as the type of prosthesis required. The relative and absolute frequencies were used as summary measures. Results: It was found that 73.0 % of the elderly lost their teeth due to dental decay, being women and the 60-64 age group the most affected one. Also, the poor oral hygiene and the necessity of partial prosthesis prevailed. Conclusions: A high morbidity existed in elderly with dental loss, which affected their functionality, aesthetics and self-esteem that could cause important consequences in the oral cavity and in the rest of the body if it is not corrected, without forgetting the prevention or early detection of any other oral disease that generates it.

Sinus floor elevation using a new bovine bone grafting material: case report and bone grafting materials update / Actualización en materiales de relleno óseo: reporte de un caso clínico de elevamiento del piso del seno maxilar usando un nuevo material de relleno óseo bovino

Bone grafting is important to preserve the alveolar bone ridge height and volume for dental implant placement. Even though implant-supported overdentures present highly successful outcomes, it seems that a great number of edentulous individuals have not pursued implant-based rehabilitation. The cost of the treatment is one of the reasons of discrepancy between highly successful therapy and its acceptance. Therefore, the development of biomaterials for bone grafting with comparable characteristics and biological effects than those renowned internationally, is necessary. In addition, domestic manufacture would reduce the high costs in public health arising from the application of these biomaterials in the dental feld. The purpose of this clinical case report is to provide preliminary clinical evidence of the efficacy of a new bovine bone graft in the bone healing process when used for sinus floor elevation. (AU)

El uso de injertos óseos es importante para preservar la altura y el volumen de la cresta alveolar para la colocación de implantes dentales. Si bien las sobredentaduras implanto-soportadas presentan resultados altamente exitosos, la mayoría de las personas desdentadas no han sido rehabilitadas mediante implantes dentales. Uno de los principales motivos por los cuales los pacientes no aceptan este tipo de tratamiento, altamente exitoso, es el elevado costo del mismo. Por ello, es necesario el desarrollo de biomateriales de injerto óseo con características y efectos biológicos comparables a los reconocidos internacionalmente. Asimismo, la fabricación nacional reduciría los altos costos en Salud Pública derivados de la aplicación de estos biomateriales en el campo dental. El objetivo de esta comunicación es presentar un caso clínico a fin de proporcionar evidencia preliminar acerca de la eficacia de un nuevo injerto de hueso bovino en el proceso de cicatrización ósea en el levantamiento del piso del seno maxilar. (AU)

Prevalence of partial edentulism according to Kennedy and Applegate in patients treated at a university dental clinic in Lambayeque-Peru / Prevalencia de edentulismo parcial según Kennedy y Applegate en pacientes de la clínica odontológica de una universidad de Lambayeque-Perú

Introduction: Edentulism is an irreversible chronic condition that seriously affects the stomatognathic system. Consequently, determining its prevalence may contribute to prioritize preventive and rehabilitative oral health interventions. Objective: To determine the prevalence of partial edentulism according to the Kennedy and Applegate classification in patients attending the Dental Clinic at Universidad San Martín de Porres - Lambayeque Campus, Peru, in the years 2016 and 2017. Materials and methods: A descriptive, retrospective and cross-sectional study was designed. The study comprised 321 clinical records that previously underwent a quality control stage, which included a calibration process (k=0.86). The criteria and rules proposed by Kennedy and Applegate were applied to estimate the prevalence of edentulism in each jaw according to sex; tables of frequency distribution containing percentage results were used. Results: The highest prevalence of partial edentulism in the upper jaw corresponded to Class III (42.4%), followed by Class I (34.6%), and Class II (16.5%). In the lower jaw, the most prevalent were Class I (42.4%), Class III (36.4%), and Class II (15.6%). According to sex, Class III and Class I were the most prevalent in both females and males. Conclusion: Class III and I were the most prevalent in the upper jaw in both females and males; while in the lower jaw, Classes I and III were the most prevalent for both sexes.

El edentulismo se presenta como una alteración irreversible y crónica, que genera consecuencias en el sistema estomatognático, por lo cual es necesario conocer su prevalencia para priorizar intervenciones de salud bucal preventivas y de rehabilitación. Objetivo: Determinar la prevalencia de edentulismo parcial según la clasificación de Kennedy y Applegate en pacientes atendidos en la Clínica Odontológica de la Universidad San Martín de Porres - Filial Lambayeque, en los años 2016 y 2017. Material y Método: Se diseñó un estudio descriptivo, retrospectivo y transversal, con 321 historias clínicas que pasaron previamente por un control de calidad que incluyó un proceso de calibración (k=0.86). Para estimar la prevalencia de edentulismo en cada maxilar y de acuerdo al género, fueron aplicados los criterios y reglas de kennedy y Applegate, utilizando tablas de distribución de frecuencias con resultados porcentuales. Resultados: La mayor prevalencia de edentulismo parcial para maxilar superior corresponde a la Clase III con 42,4%, siguiendo en orden descendente la Clase I con 34.6% y la Clase II con 16.5%. En el maxilar inferior, la más prevalente fue la Clase I con 42,4%, continuando la Clase III con 36.4% y la Clase II con 15.6%. De acuerdo a género, resultaron más prevalentes la Clase III y la Clase I tanto para mujeres como para hombres. Conclusiones: Las clases III y I fueron las más prevalentes en el maxilar superior, tanto para género masculino como femenino; mientras que en el maxilar inferior, fueron las clases I y III las más prevalentes también para ambos géneros.

Tipo de edentulismo parcial bimaxilar y su asociación con el nivel socioeconómico-cultural / Type of bimaxillary partial edentulism and its association with socioeconomic cultural level

Introducción: El edentulismo parcial es una condición final a la presencia de caries dental relacionado con diversos factores sociales, demográficos y culturales. Actualmente, existen escasos estudios que valoren el estado de edentulismo parcial y su asociación con el nivel socioeconómico-cultural. Objetivo: Determinar la frecuencia del tipo de edentulismo parcial bimaxilar según la Clase de Kennedy y su posible asociación con el nivel socioeconómico-cultural en los pacientes de la clínica de la Facultad de Odontología de la Universidad Nacional Mayor de San Marcos del año 2016. Material y Métodos: Estudio descriptivo, observacional y transversal. La muestra estuvo conformada por 100 pacientes adultos edéntulos parciales seleccionados aleatoriamente que fueron evaluados mediante una encuesta y un examen clínico oral. La encuesta estuvo conformada por los datos sobre el nivel socioeconómico-cultural. El examen clínico se evaluó con un odontograma para determinar el tipo de edentulismo según la clasificación de Kennedy. Resultados: El tipo de edentulismo parcial más frecuente fue la Clase III de Kennedy en la arcada maxilar (50 por ciento) y en la mandibular (49 por ciento), los portadores pertenecían en gran medida al nivel socioeconómico-cultural medio (83 por ciento). No se evidenció una asociación estadísticamente significativa entre el nivel socioeconómico-cultural y el tipo de edentulismo parcial según la Clase de Kennedy en ambas arcadas dentarias. Conclusiones: En la población estudiada existe una mayor frecuencia de edentulismo parcial bimaxilar Clase III de Kennedy y una preponderancia del nivel socioeconómico-cultural medio. Sin embargo, no existe asociación entre el tipo de edentulismo parcial según la Clase de Kennedy y el nivel socioeconómico-cultural(AU)

Introduction: Partial edentulism is a final condition to the presence of dental caries related to various social, demographic and cultural factors. Currently, there are few studies that assess the state of partial edentulism and its association with the socioeconomic cultural level. Objective: To determine the frequency of the type of bimaxillary partial edentulism according to Kennedy´s Class and its possible association with the socioeconomic cultural level in patients treated in the clinic of the Faculty of Dentistry of the National University of San Marcos in 2016. Material and methods: A descriptive, observational and cross-sectional study was conducted. The sample consisted of 100 randomly selected partial edentulous adult patients who were evaluated by means of a survey and an oral clinical examination. The survey was made up of the data that relate socioeconomic cultural level. The clinical examination was evaluated with an odontogram to determine the type of edentulism according to Kennedy´s classification. Results: The most frequent type of partial edentulism was Kennedy's Class III in the maxillary arch (50 percent) and in the mandible (49 percent), which was mainly present in patients that belonged to the average socioeconomic cultural level (83 percent). There was no statistically significant association between the socioeconomic cultural level and the type of partial edentulism according to Kennedy´s Class in both dental arches. Conclusions: In the studied population, there is a greater frequency of partial bimaxilar edentulism according to Kennedy's Class III and a preponderance of the socioeconomic cultural level. However, there is no association between the type of partial edentulism according to Kennedy´s Class and the socioeconomic cultural level(AU)

Restabelecimento da dimensão maxilomandibular em prótese total pela técnica do arco inferior: relato de caso clínico / Reproduction of the maxillo-mandibular dimension in complete denture by the lower arc technique: clinical case report

O registro da relação maxilo-mandibular (RMM) é considerado um passo crítico na confecção de novas próteses totais (PT) pois exige uma precisão técnica capaz de permitir o seu reestabelecimento, de forma confortável e equilibrada com a musculatura oral. O registro é obtido em dois planos, um vertical e outro horizontal: o plano vertical é determinado pela dimensão vertical (DV) e o plano horizontal é estabelecido pela relação cêntrica (RC). Ambos recuperam o suporte labial, altura incisal, linha do sorriso e o corredor bucal de forma natural e personalizada. Esse registro pode ser obtido, iniciando pelo arco inferior, seguindo a fisiologia e anatomia orofacial. Nessa técnica, considerase três princípios fisiológicos: crista alveolar, situada sobre o rebordo alveolar, musculatura relacionada que determinará o corredor bucal e posição lingual do rodete e a linha úmida do lábio inferior que determinará a altura do rodete inferior. Dessa forma, este trabalho tem por objetivo descrever por meio de condução de caso clínico a técnica de restabelecimento da RMM em paciente edentado bimaxilar iniciando pelo arco inferior(AU)

The maxillo-mandibular relation (MMR) is considered a critical step in the preparation of new complete denture (CD), since it requires a technical precision capable of allowing its reestablishment, in a comfortable and balanced way with the oral musculature. The register is obtained in two planes, one vertical and one horizontal: the vertical plane is determined by the vertical dimension (VD) and the horizontal plane is established by the centric relation (CR). Both recover the lip support, incisal height, smile line and buccal corridor in a natural and personalized way. This record can be obtained, beginning with the lower arch, following the physiology and orofacial anatomy. In this technique, three physiological principles are considered: alveolar crest, located on the alveolar ridge, related musculature that will determine the buccal corridor and the lingual position of the wax rim and the humid line of the lower lip which will determine the height of the lower wax rim. Thus, this study aims to describe, by way of conducting a clinical case, the technique of restoration of RMM in a bimaxillary edentulous patient starting with the inferior arch(AU)

Factores de riesgo de la atrición dental severa: un estudio de casos y controles / Severe dental attrition and associated factors: a case-control study

Objetivo: identificar los factores de riesgo de la atrición dental severa en pacientes que acudieron a instituciones de atención odontológica, públicas y privadas, de la ciudad de Cuenca, Ecuador. Materiales y métodos: fueron analizados 237 pacientes adultos, 79 casos con atrición dental grados 2, 3 y 4, según el índice de Smith y Knight, y 158 contro- les con atrición grados 0 y 1. Se realizó un examen clínico y fotográfico para determinar la relación entre la atrición dental y factores como edad, sexo, procedencia, número de dientes residuales, pH salival y bruxismo. Resultados: los pacientes mayores de 25 años (OR= 2,47; IC= 1,41 ­ 4,35; X2= 10,21; p= 0,001), con menos de 20 dientes en boca (OR= 4,95; IC= 1,47 ­ 16,62; X2= 7,97; p= 0,004 ) y con bruxismo (OR= 2,64; IC= 1,45 ­ 4,81; X2= 10,49; p= 0,001) tienen más probabilidades de presentar atrición dental severa. Luego de una regresión logística binaria se confirmó dicha relación: pacientes mayores de 25 años (OR= 2,03; IC= 1,08 ­ 3,818) con menos de 20 dientes en boca (OR= 3,90; IC= 1,07 ­ 14,19) y con bruxismo (OR= 3,22; IC= 1,70 ­ 6,10); sin embargo, se observó una capacidad predictora muy baja de la variables ajustadas según el R­cuadrado de Cox y Snell (0,123) y el R­cuadrado de Nagelkerke (0,172). Conclusiones: edad avanzada, menor cantidad de dientes en boca y bruxismo aumentaron la posibilidad de presentar atrición dental severa en los pacientes analizados. Mientras que el sexo masculino, la procedencia rural y el pH salival crítico (menor a 6) no se comportaron como factores de riesgo.

Alteraciones anatómicas del conducto nasopalatino en pacientes dentados y desdentados en el sector anterosuperior utilizando tomografía computarizada de haz cónico / Anatomical alterations of the nasopalatine canal in dentate and edentulous patients at the front superior sector based on cone beam computed tomography

Introducción: el conducto nasopalatino (CNP) es un trayecto intraóseo largo y delgado presente en la línea media anterior del maxilar, conecta el paladar con el piso de la cavidad nasal. El objetivo del estudio fue comparar las medidas del conducto nasopalatino y su forma mediante tomografía de haz cónico en pacientes dentados y pacientes desdentados en el sector anterosuperior. Materiales y métodos: estudio descriptivo y comparativo, se tomaron del archivo del Departamento de Imagenología 150 tomografías de pacientes dentados anterosuperiores y 52 tomografías de pacientes desdentados anterosuperiores. Mediante Excel y su herramienta "aleatoria" se seleccionaron 30 tomografías de pacientes dentados y 30 tomografías de pacientes desdentados. Se midió en el plano sagital oblicuo la distancia anteroposterior del conducto nasopalatino a nivel de su tercio superior, medio e inferior. Para determinar su altura se tomó el plano axial del nivel de la bifurcación superior hasta la desembocadura palatina. La adquisición de imágenes se realizó través del software i-Dixel del equipo 3D Accuitomo 170 MORITA, sistema DICOM. Resultados: los pacientes dentados presentan alturas mayores en relación a los pacientes edéntulos. En diámetro transversal los pacientes edéntulos presentan mayor tamaño a nivel del canal del CNP. Las medidas a nivel inferior, medio y superior en las corticales del diámetro del CNP en pacientes dentados son menores en relación a los pacientes edéntulos. Conclusión: los pacientes de 40 a 70 años de ambos sexos con edentulismo anterosuperior presentaron variaciones estructurales topográficas que consisten en mayor anchura, menor longitud y mayor dimensión transversal, siendo conductos agrandados.

Background: The nasopalatine canal (NPC) is a long and thin intraosseous passage present in the anterior midline of the maxilla that connects the palate with the floor of the nasal cavity. The objective of the study was to compare the measures of nasopalatine duct and its shape by cone beam tomography in dentate patients with respect to edentulous patients in the frontal anterior sector. Materials and methods: descriptive and comparative study, was taken from the files of the Imagenology Department 150 tomographies of anterosuperior dentate patients and 52 tomographies of edentulous in the frontal anterior sector. Unsing the Excel program and its tool "random", 30 tomographies of dentate patients were selected as well as the 30 tomographies of edentulous. Were measured in the oblique sagittal plane the anteroposterior distance of the nasopalatine canal at the level of its upper, middle and lower third. To determine its height, the axial plane was taken from the level of the upper bifurcation to the palatal opening. The acquisition of images was done through the i-Dixel software of the 3D Accuitomo 170 MORITA, DICOM system. Results: the dentate patients present higher heights in relation to the edentulous patients. In edentulous patients the diameter have a larger size at the NPC channel level. The measurements at the lower, middle and upper levels in the cortices of the diameter of the NPC in dentate patients are lower in relation to the edentulous patients. Conclusion: Patients of 40 to 70 years old, male and female, with frontal anterior edentulism presented structural topographic variations that consist of greater width, smaller longitudinal dimension and larger transversal dimension being enlarged canals.

Avaliação biomecânica da angulação dos implantes posteriores nas reabilitações totais implantossuportadas em mandíbula através de método de elementos finitos / Biomechanical evaluation of hindraft implant anglulation in total implant-su-pported mandible rehabilitations through finite element method

Introdução: Como uma opção de tratamento ao edentulismo mandibular foi desenvolvido o conceito All-on-4®, uma técnica de ancoragem com a instalação de quatro implantes distribuídos na região anterior da mandíbula edêntula para uma reabilitação total implantossuportada. Objetivo: Neste estudo, analisamos pelo método de elementos finitos o comportamento biomecânico dos implantes e tecidos ósseos. Material e métodos: Foram utilizados 3 modelos tridimensionais computadorizados, cada um com 4 implantes hexágono externo 3,75x13mm na região interforames mentuais, os implantes anteriores mantidos na posição axial e a variação ocorreu nos implantes posteriores: grupo 1, implantes posteriores retos; grupo 2, implantes posteriores com inclinação em 17° e grupo 3, com implantes posteriores inclinados em 30°. Uma carga axial de 150N foi aplicada nos molares e de 100N nos pré-molares bilateralmente. Resultados: Após análises evidenciou-se que nos grupos 17° (13,68Mpa, 34,76Mpa e 14,36Mpa para as tensões de tração, compressão e cisalhamento respectivamente) e 30° (14,26Mpa, 23,14Mpa e 10,31Mpa para as tensões de tração, compressão e cisalhamento respectivamente) apresentaram menores picos de tensão no osso. O mesmo padrão de distribuição de tensões foi observado para os implantes, com redução quando inclinamos os implantes distais. Conclusão: Os resultados mostraram que a angulação dos implantes favoreceu a distribuição das tensões no osso e implantes, interferindo positivamente na performance biomecânica das reabilitações totais implantossuportadas em mandíbulas edêntulas, considerando que no grupo dos implantes retos os valores das tensões foram maiores.

Introduction: As a treatment option for mandibular edentulism, the All-on-4® concept was developed, an anchoring technique with the installation of four implants distributed in the anterior region of the edentulous mandible for total implant-supported rehabilitation. Objective: In this study, we analyzed by the finite element method the biomechanical behavior of implants and bone tissues. Material and methods: Three computerized three-dimensional models were used, each with 4 external hexagon 3.75x13mm implants in the mental interforam region, the anterior implants kept in the axial position and the variation occurred in the posterior implants: group 1, straight posterior implants; group 2, posterior implants inclined at 17° and group 3, posterior implants inclined at 30°. An axial load of 150 N was applied to the molars and 100 N to the premolars bilaterally. Results: After analysis, it was found that in the 17° (13.68Mpa, 34.76Mpa and 14.36Mpa groups for tensile, compressive and shear stresses respectively) and 30 ° (14.26Mpa, 23.14Mpa and 10.31Mpa for tensile, compressive and shear stresses respectively) presented lower stress peaks in the bone. The same pattern of stress distribution was observed for the implants, with reduction when the distal implants were tilted. Conclusion: The results showed that the angulation of the implants favored the distribution of stresses in the bone and implants, positively interfering in the biomechanical performance of the total implant-supported rehabilitations in edentulous jaws, considering that in the group of straight implants the stress values were higher.

An assessment of accuracy of half-guided implant surgery using implant surgical guide: A case report / 대한치과보철학회지

Nowadays, dental implant is one of the widely used treatment options for edentulous patients. Recently, a method of improving the accuracy of implant surgery using an implant surgical guide has been introduced and widely used in order to accurately place the implant in a proper position. Full-guided and half-guided implant surgery can be distinguished according to the level of surgical guide application during the implant surgery. It is true that full-guided implant surgery exhibits higher accuracy, but half-guided implant surgery is often performed in a clinical situation due to the factors such as the circumstances of the operation. A partially edentulous patient who lost teeth due to tooth fracture and periodontal disease was treated using implant and fixed prosthesis. Half-guided implant surgery was performed using an implant surgical guide during implant surgery, the accuracy of implant placement was analyzed.

Clinical and radiographic evaluation of implant-supported mandibular overdentures subjected to immediate loading: a 36-month follow-up / Evaluación clínica y radiográfica de implantes rehabilitados con sobredentaduras mandibulares y sometidos a carga inmediata: 36 meses de observación

ABSTRACT. Introduction: the aim of this study was to clinically and radiographically evaluate 54 implant-supported mandibular overdentures under the protocol of immediate loading, using a retention system with ball attachments. This evaluation was performed within 36 months of function of the implants. Methods: observational descriptive study in 27 fully edentulous patients who were evaluated in a 36-months follow-up period, after having two internal connection implants placed in the interforaminal area of the lower maxilla. The implants were evaluated in terms of survival rate, amount of peri-implant bone loss, condition of peri-implant tissues, prosthesis behavior, and degree of patient satisfaction. Results: survival rate at 36 months was 98.1% and the average radiographic bone loss was 0.45 mm (SD 0.6); there was a low level of plaque and average probing depth was 1.75 ± 0.75 mm. 57% of prosthesis showed active retention. 43% did not show retention or it was provided by one of its elements. 53.8% of overdentures were stable. A high percentage of patients showed total satisfaction. Conclusion: in a 36-months follow-up, a mandibular overdenture with ball attachments placed on two non-splinted implants immediately loaded is a predictable treatment in patients with fully edentulous lower maxilla, with high implant survival rates, low levels of peri-implant bone loss, and a high degree of patient satisfaction.

RESUMEN Introducción: el objetivo de este estudio consistió en evaluar clínica y radiográficamente, después de 36 meses de función, 54 implantes colocados en el maxilar inferior y rehabilitados con sobredentaduras bajo el protocolo de carga inmediata, utilizando un sistema de retención tipo bola. Métodos: estudio observacional descriptivo que consideró 27 pacientes totalmente desdentados que fueron evaluados en un seguimiento a 36 meses, luego de haber recibido cada uno dos implantes de conexión interna, instalados en la región interforaminal del maxilar inferior. Los implantes fueron evaluados en términos de supervivencia, cantidad de pérdida ósea periimplantar, estado de los tejidos periimplantares, comportamiento de la prótesis y grado de satisfacción de los pacientes. Resultados: la tasa de supervivencia a los 36 meses fue de 98,1%, el promedio de pérdida ósea radiográfica fue de 0,45 mm (DE 0,6); se presentó un nivel de placa bajo y el promedio de profundidad al sondaje fue de 1,75 ± 0,75 mm. El 57% de las prótesis presentaron retención activa. El 43% no presentó retención, o su retención estaba dada por uno solo de sus elementos. El 53,8% de las sobredentaduras se encontraron estables. Un alto porcentaje de los pacientes manifestaron satisfacción total. Conclusión: a 36 meses de observación, una sobredentadura mandibular retenida por pilares en bola colocada sobre dos implantes no ferulizados y cargados inmediatamente es un tratamiento predecible en pacientes con desdentación total inferior, con una alta tasa de supervivencia de los implantes, bajos niveles de pérdida ósea periimplantar y alto grado de satisfacción de los pacientes.

Reabilitação oral de paciente com síndrome da combinação: relato de caso / Patient oral rehabilitation with combination syndrome: case report

Objetivo: o tratamento de pacientes desdentados com reabsorção alveolar severa é uma temática desafiadora na reabilitação protética. Identificada por Kelly em 1972, a síndrome da combinação é uma manifestação intraoral encontrada em pacientes totalmente desdentados na arcada superior, em oposição a uma prótese mandibular de extensão distal bilateral. Relato de caso: este estudo revisa e discute, por meio de um caso clínico, as características clínicas presentes em um paciente com manifestações da síndrome da combinação. Além disso, apresenta uma proposta de tratamento reabilita¬dor, restabelecendo a função fonética e a estética do paciente. Considerações finais: diagnosticar a síndrome e estabelecer um plano de tratamento adequado às necessidades do paciente, criando condições clínicas para o restabelecimento da saúde, são imprescindíveis para obter resultado e, assim, impedir o avanço do quadro clínico. (AU)

Objective: treatment of patients with reactivity with respiratory problems. Identified by Kelly in 1972, a combination syndrome and an intraoral manifestation found in fully edentulous patients in the upper arch as opposed to a mandibular prosthesis of bilateral distal extension. Case report: the present study reviews and discusses, through a clinical case, as clinical features present in a patient with manifestations of the combination syndrome, in addition, to present a proposal of rehabilitative treatment, restoring function, phonetics and esthetics to the patient. Final considerations: diagnosing a syndrome and establishing a treatment plan appropriate to the needs of the patient and creating clinical conditions for the reestablishment of health are essential to obtain the result and thus impeding the advancement of the clinical picture. (AU)

Prosthetic, orthodontic and implant-supported rehabilitation of five maxillary anterior teeth with alveolar bone loss

ABSTRACT Introduction: Treatment of maxillofacial injuries is complex and requires the establishment of a comprehensive and accurate diagnosis and correct treatment planning. Objective: The objective of this case report was to describe the re-treatment of a 27-year-old woman who was involved in a severe car accident that resulted in the loss of five anterior teeth and alveolar bone, and whose previous orthodontic and surgical treatments had been unsuccessful. Case report: In this case, the space for the missing mandibular molar was reopened to allow for rehabilitation. The positions of the mandibular incisors were improved. The right mandibular canine was moved to the mesial, allowing for correction of the Class II canine relationship on that side, and implants were placed to replace the maxillary anterior teeth. Conclusion: Anterior aesthetic and functional rehabilitation using a multidisciplinary approach was essential to improve the patient's facial aesthetics, to obtain great improvement in function and to achieve occlusal stability after 2 years of follow-up.

RESUMO Introdução: o tratamento de danos bucomaxilofaciais é complexo e requer diagnóstico abrangente e preciso, além de um correto plano de tratamento. Objetivo: o objetivo deste relato de caso foi descrever o retratamento de uma paciente do sexo feminino, 27 anos de idade, envolvida em acidente automobilístico grave, que resultou na perda de cinco dentes, além de perda óssea alveolar na região anterior. Relato de caso: a paciente apresentava histórico de insucesso de tratamento ortodôntico e cirúrgico. No caso apresentado, o espaço referente aos molares inferiores ausentes foi reaberto, para possibilitar a reabilitação. Houve melhora no posicionamento dos incisivos inferiores. O canino inferior direito foi deslocado para mesial, possibilitando a correção da relação de Classe II intercaninos do mesmo lado. Implantes foram inseridos a fim de substituir os dentes superiores da região anterior. Conclusão: a reabilitação estética e funcional da região anterior, realizada por meio de uma abordagem multidisciplinar, foi fundamental para valorizar a estética facial da paciente, melhorar a função e promover estabilidade oclusal após dois anos de acompanhamento.

Horizontal Bone Reconstruction on sites with different amounts of native bone: a retrospective study

Abstract: The lack of guidelines for bone augmentation procedures might compromise decision making in implantology. The objective of this study was to perform a retrospective study to verify the outcomes of horizontal bone reconstruction in implant dentistry with different types of materials and amounts of native bone in the recipient bed to allow for a new guideline for horizontal bone reconstruction. One hundred preoperative CT scans were retrospectively evaluated and categorized in accordance to horizontal bone defects as presence (Group P) or absence (Group A) of cancellous bone in the recipient bed. Different approaches were used to treat the edentulous ridge and the outcomes were defined either as satisfactory or unsatisfactory regarding the possibility of implant placement. The percentage distribution of the patients according to the presence or absence of cancellous bone was 92% for Group P and 8% for Group A. In Group P, 98% of the patients had satisfactory outcomes, and the use of autografts had 100% of satisfactory outcomes in this group. In Group A, 37.5% of the patients had satisfactory outcomes, and the use of autografts also yielded 100% of satisfactory outcomes. The use of allografts and xenografts in Group A had 0% and 33.3% of satisfactory outcomes, respectively. Therefore, it seems reasonable to speculate that the presence of cancellous bone might be predictive and predictable when the decision includes bone substitutes. In cases of absence of cancellous bone in the recipient bed, the use of a vitalized graft seems to be mandatory.