Approaches to the preparation of the oral cavity for prosthetics using computer simulation: An analysis of domestic and foreign experience / 国际药学研究杂志

The article analyzes domestic and foreign experience in planning the preparation of oral cavity for prosthetics. Recently, thanks to the development of computer technology, the possibility of virtual 3D-modeling of the prosthesis design and its further prototyping has appeared [1; 2; 5]. Digital treatment planning, based on three-dimensional imaging procedures, allows you to plan therapy with absolute precision and makes the outcome of treatment exactly predictable. Analysis of domestic experience shows that one of the most common in the practice of orthopedic dentistry is the program Blue Sky Plan. Patterns made in the program are easily exported to STL files and do not require additional processing. The program contains a wide range of implant systems. In foreign practice, guided surgery from DENTSPLY Implants is very popular, which offers a comprehensive solution for digital treatment planning and placement of implants based on SIMPLANT software templates.

Making dentition model from negative dental impression in implant treatment / Fabricación de un modelo de dentición a partir de una impresión dental negativa para el tratamiento con implantes

In dental implant treatment or corrective surgery, a dental plaster model is produced to recognize the shape of the teeth. Understanding this dentition model is an important issue in prosthetic dentistry and craniomaxillofacial surgery. However, dental models are time consuming and costly to produce via traditional casting methods. We provide a method which makes dentition model from both a positive and a negative dental impression. Also we produce a system for making a digital dentition model using computed tomography (CT) data during the impression process. Additionally, the system allows the digital dentition model to be realized via a three-dimensional printer. The result simplifies production of the dentition model, since a physical model can be produced directly from an impression of the patient. Our system can simplify the dentition process and treatment intervention involved in making a dentition model. The digital model enables clinicians to manage the patient's cumulative data and to predict changes during the course of treatment.

En el tratamiento de implantes dentales, o cirugía correctiva, se produce un modelo de yeso dental para reconocer la forma de los dientes. La comprensión de este modelo de dentición es un tema importante en la odontología protésica y la cirugía craniomaxilofacial. Sin embargo, los modelos dentales con sumen tiempo y son costosos de producir a través de los métodos tradicionales de fundición. Proporcionamos un método que hace que el modelo de dentición sea tanto positivo como negativo. También proponemos un sistema para hacer un modelo de dentición digital utilizando datos de tomografía computarizada (TC) durante el proceso de impresión. Además, el sistema permite que el modelo de dentición digital se imprima a través de una impresora tridimensional. El resultado simplifica la producción del modelo de dentición, ya que un modelo físico puede ser producido directamente a partir de una impresión del paciente. Nuestro sistema puede simplificar el proceso de dentición y la intervención de tratamiento involucrados en la elaboración de un modelo de dentición. El modelo digital permite a los médicos manejar los datos acumulados del paciente y predecir los cambios durante el curso del tratamiento.

Avaliação da alteração dimensional de técnicas de moldagem de trabalho em prótese fixa / Accuracy's Evaluation of Impression Techniques in Fixed

A moldagem de trabalho é a transferência de informações da arcada do paciente para um modelo de gesso a ser encaminhado ao laboratório para realizar o trabalho protético. Este trabalho teve como objetivo avaliar quatro técnicas de moldagem de trabalho em prótese fixa, utilizando-se o material de moldagem Zetaplus Orangewash (Zermack), a saber: a técnica em fase única e três técnicas de reembasamento: a primeira, utilizando espaçadores de 1 mm; a segunda, espaçadores de 2 mm e a terceira, a técnica com plástico de polietileno ("PVC"). Foi confeccionada uma matriz de aço inoxidável com dois cilindros e estipuladas cinco marcações na matriz: distância entre os centros dos cilindros, diâmetro do cilindro 1, diâmetro do cilindro 2, altura do cilindro 1 e altura do cilindro 2. Foram realizadas cinco moldagens de trabalho para cada grupo, totalizando vinte amostras. Estas foram levadas para se realizarem as medições em uma lupa Askania Variant, com o auxílio de uma câmera e enviadas ao programa Image Pro Plus. Como resultado, verificou-se não ter havido diferença significativa entre os grupos testados, podendo, portanto, se concluir que as quatro técnicas testadas neste estudo podem ser utilizadas em moldagem de trabalho em prótese fixa.

The impression is one of the most important clinical procedure in prosthetic dentistry, because it transfer the bucal informations of the pacient to a model cast that will go to prosthetic department to do the reabilitation one. This study purpose was to valuate four impression techniques: 1-one step technique, 2- two step with 1 mm relief, 3- two step with 2 mm relief and two step with a polyethylene spacer, using Zetaplus Oranwash (Zermack). A stainless cast was built with two cylinder like crown of dental prepares. Five mensures were done: Distance between the center of the cylinders, diameter of cylinder 1, diameter of cylinder 2, height of cylinder 1, height of cylinder 2. Were done three mensures for the stainless cast to get a medium one. The mensures were: 2,332 cm, 0,980 cm, 0,768 cm, 0,957 cm and 0,967 cm, respectively. Were done five impressions for each group, about twenty at the total. These master model were mensured in a microscope Askania-Variant, MZM1 with a camera that gets information to a Image Pro Plus program, wich was mensured 24 hours later then the model cast were built. The result gave that the distance between all the mensures don't have difference between the groups with 5 % of ANOVA. The conclusion of this study is: The four impression techniques can be used for prosthetic dentistry.