An alternative adhesive based technique of raising the occlusal vertical dimension.

Purpose: Decimated dentitions may require raising the vertical dimension in some conditions while performing a full mouth rehabilitation treatment. Increase in a vertical dimension should be diagnosed by reversible methods prior to performing any irreversible methods for a minimum time period. Reversible methods like splints and overlay dentures are often used for this purpose. These methods however cannot be used in some conditions like in cases of brittle teeth. Method: An alternative technique based on adhesive technology has been described which is reversible and yet minimally traumatic to teeth. Conclusions: The technique has two basic aims. The first is to accurately implement the occlusal scheme as planned in the diagnostic wax‑up in the reversible method of altering the vertical dimension. The second aim is to increase the vertical dimension with minimal damage to the teeth.

The effect of temporary hydrostatic splint on occlusion with computerized occlusal analysis system.

Aims: The aim of this study was to evaluate the effect of temporary hydrostatic splint on occlusion with computerized occlusal analysis system. Material and Methods: Maximal bite force was recorded in intercuspal position by use of computerized occlusal analysis system from 11 female, 9 male, 20 subjects, (average age of 20) with normal intact dentitions. Subjects were instructed to use the hydrostatic splint for 24 h. Occlusal records were repeated three times before and after splint. All recordings were evaluated to determine the repeatability of the computerized occlusal analysis system. Results and Conclusion: Hydrostatic splint increased maximum biting force. Relative percentage of left and right bite forces changed in the direction of neurophysiological position of the muscles. Hydrostatic splint can be a viable option for occlusal adjustments.

Sistemas de medicion de fuerzas oclusales puntuales / Systems for measurement puctual occlusal forces

The purpose of this investigation is to construct a device to measure occlusal stresses at a fixed point, to include in the design of a fixed restoration the concept of strength produced when occluding. Once this is done numerically the level of error can be decreased. The basic procedure used was the analysis of internal stressed produced on a tooth when occluding, through the study of photoelasticity in two-dimensions and the system of finite elements. In order to design the Strain Gauge several types of transducers were studied: a) Strain Gauge B) Pressure of Force Gauges c) Displacement Gauges.

Distribuiçäo periodontal das tensöes internas relacionadas com o primeiro molar inferior, após secçäo dental / Periodontal internal stress distribution related to the first molar, after dental sectioning

Realizou-se trabalho experimental empregando-se dentes de resina acrílica incluídos em silicona Sylgard 184, simulando lesäo de furcaçäo em dentes com suporte periodontal normal e reduzido em 1/3 na área marginal. Foram confeccionados 5 modelos fotoelásticos utilizando-se o 2§ PM, 1§ e 2§ M inferiores direitos, estando o 1§ Molar seccionado longitudinalmente, porém mantendo-se ambas as raízes. Esses modelos foram montados em articulador Dentatus ARL em oclusäo normal com modelos superiores. Os testes fotoelásticos nos modelos com periodonto normal mostraram que a força é transmitida à regiäo apical dos dentes, com maior concentraçäo na raiz mesial. Nos dentes com periodonto debilitado, a característica principal de distribuiçäo de forças continuou sendo apical, com maior concentraçäo na raiz mesial, porém quantitativamente foi necessária menor força que no caso anterior. A seguir, esplintou-se as duas secçöes dentais ao nível coronal e repetiram-se os testes fotoelásticos, sendo o comportamento muito semelhante àquele quando do periodonto normal, tanto no aspecto quantitativo como no qualitativo, evidenciando-se o efeito da esplintagem na distribuiçäo de forças