The Role of Occlusal Factors in the Presence of Noncarious Cervical Lesions in Young People: A Case-Control Study.

OBJECTIVE:: The aim of this retrospective case-control study was to evaluate the influence of different occlusal characteristics and self-referred bruxism in the presence of noncarious cervical lesions (NCCLs). METHODS AND MATERIALS:: The participants were 280 students (140 cases and 140 controls), with an average age of 24.5 years, from six schools of dentistry in Spain. Clinical examination was carried out to record the NCCLs and the static and dynamic occlusal characteristics. The side of mastication and bruxism was collected by questionnaire. Data variables were analyzed by means of univariate and multivariate logistic regression. Odds ratios and the respective 95% confidence intervals were calculated ( p<0.05). RESULTS:: The presence of NCCLs was significantly more likely in subjects with protrusive interferences (odds ratio [OR]=1.82); with lateral interferences, especially on the nonworking side (OR= 1.77); or who were self-reported bruxists (OR=1.72). In the multivariate analysis, protrusive interferences, bruxism, age, and the presence of attrition were risk factors for the development of NCCLs. These factors resulted in a model with an area under the receiver-operating characteristic curve of 0.667 and a positive predictive value of 61.43%. CONCLUSIONS:: There was no significant relationship between most occlusal factors and the presence of NCCLs. Only bruxism, protrusive interferences, age, and occlusal wear were risk factors. The predictive model was not sufficiently explanatory. Occlusal factors alone do not appear to be sufficient to explain the presence of NCCLs.

Relación céntrica: revisión de conceptos y técnicas para su registro. Parte I / Centric relation: concepts revision and recording techniques. Part I

La relación céntrica ha sido objeto de disparidad de criterios en la odontología durante más de un siglo. A lo largo de este trabajo, vamos a exponer diferentes métodos usados tanto para obtener el registro, como para comprobar su certeza y corroborar la posición condilar. Dado que no existe evidencia científica en el tema, en este trabajo, revisaremos los estudios experimentales que aparecen en la literatura. Los hemos divididos en dos partes, la primera relacionada con la definición de relación céntrica y la segunda parte relacionada con técnicas de registro, posición condilar y la discrepancia entre relación céntrica y oclusión céntrica (AU)

The centric relation has been controversial on dentistry during more of one century. Along of this work, we are going to expose different methods to recording as checking the accuracy and condilar position. Given that there aren’t scientific evidence, in this work, we review the researches publicated. We have divided them into two parts; the first is related with the definition of centric relation and the second part is related with recording techniques, condilar position and centric relation- centric occlusion discrepancy (AU)

Relación céntrica: revisión de conceptos y técnicas para su registro. Parte II / Centric relation: concepts revision and recording techniques. Part II

La relación céntrica ha sido objeto de disparidad de criterios en la odontología durante más de un siglo. A lo largo de este trabajo, vamos a exponer diferentes métodos usados tanto para obtener el registro, como para comprobar su certeza y corroborar la posición condilar. Dado que no existe evidencia científica en el tema, en este trabajo, revisaremos los estudios experimentales que aparecen en la literatura. Los hemos divididos en dos partes, la primera relacionada con la definición de relación céntrica y la segunda parte relacionada con técnicas de registro, posición condilar y la discrepancia entre relación céntrica y oclusión céntrica (AU)

The centric relation has been controversial on dentistry during more of one century. Along of this work, we are going to expose different methods to recording as checking the accuracy and condilar position. Given that there aren’t scientific evidence, in this work, we review the researches publicated. We have divided them into two parts; the first is related with the definition of centric relation and the second part is related with recording techniques, condilar position and centric relation- centric occlusion discrepancy (AU)

Estudio piloto comparativo entre cubetas individuales en implantoprótesis / Comparative pilot study between custom trays in implant prosthetic

El presente trabajo tiene por objeto realizar un estudio piloto sobre las características más idóneas de las cubetas de impresión para prótesis sobre implantes, adjuntando una revisión de la literatura y proponiendo un material y diseño específico para cubetas individuales en prótesis sobre implantes (AU)

The present work have to object to make a pilot study about the ideal characteristics of impression trays for implant prosthodontic, attaching a literature review and suggesting a specific material and design for custom trays in implant prosthodontic (AU)

Variations in the number of human permanent teeth: hypodontia

The partial absence of teeth germs is a hereditaryor acquired congenital defect called hypodontia.The present report analyses and discusses hypodontiain permanent dentition on the basis ofeleven clinical cases. In these, the hypodontiacorresponded to mandibular central incisors,maxillary lateral incisors, maxillary canines, ormaxillary and mandibular premolars and molars.All these cases of hypodontia were recorded byphotographs of the oral cavity and/or by orthopantomographicstudies. Together with themost-frequent types of hypodontia already reportedin the literature, other unusual anomaliesthelack of permanent canines, central incisors,or molars - from both the maxillary andmandibular alveolar arches- were also detected (AU)

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Oral anatomical defects associated with cleft palate and cleft lip

Patients suffering from a cleft palate and/or cleftlip present evident anatomical defects in bothformations. However, these developmentaldisorders are often accompanied by importantdisturbances in other anatomical structures ofthe mouth and adjacent tissues that may affectnormal dental occlusion and, consequently, thebasic functions of mastication and phonation.The objectives of the present work were to describeand discuss the above structural modifications,presenting several clinical cases in whichthe anatomical defects are described togetherwith the functional implications. The anomaliesfound include important variations in the numberof teeth, the position, disposition and relationof the alveolar processes, and the impairmentof dental occlusion. In the cases studied,these anatomical defects have elicited prominentalterations in the normal functions of masticationand phonation, and also in facial aesthetics. Photographsof mouths, dental casts, and X-rays areused to illustrate our report

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Arcos faciales de transferencia. Estudio comparativo / Transfers Face-bow. Comparative study

En el presente trabajo pretendemos analizar la influencia que el empleo de distintos arcos faciales de transferencia puede tener sobre la inclinación del plano de oclusión y la distancia del modelo al eje de giro. Para ello utilizamos un articulador semiajustable Dentatus ARI, con tres arcos faciales, empleando como referencia posterior sucesivamente el centro real de rotación condilar, un centro promedio y el conducto auditivo externo. La muestra empleada fue de 20 pacientes en los que se repetían tres transferencias del modelo superior sobre los que se determina la inclinación del plano de oclusión así como la distancia del modelo al eje de giro en ambos casos en el plano sagital y frontal. Los resultados por nosotros obtenidos demuestran que las diferencias obtenidas entre los tres procedimientos son clínicamente irrelevantes (AU)

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