ABSTRACT
RESUMEN: Factores como el tipo de resina compuesta y sistema de matrices son clave para lograr una adecuada intensidad del punto contacto, la cual puede determinar el éxito de una restauración clase II. Con el objetivo de comparar la intensidad del punto de contacto obtenida en restauraciones de resina clase II, cuando se usan diferentes consistencias de resinas compuestas y sistemas de matrices en estudios in vitro, se realizó una revisión sistemática según la pauta PRISMA. Los estudios fueron seleccionados a través de una estrategia de búsqueda para cada base de datos electrónica (MEDLINE/ PubMed, Scopus, Web of Science y EBSCO host). En cada artículo seleccionado, se tabularon: autor/año, tamaño muestral, diente utilizado y preparación cavitaria, tipo de resina compuesta, tipo de sistema matriz e intensidad del punto de contacto (resultado medido en Newton). La calidad metodológica se analizó mediante una pauta modificada para estudios in vitro. De 90 artículos, un total de 5 artículos reunieron los criterios de selección y fueron incluidos. De estos cinco artículos, sól o dos artículos estudiaron la influencia de la consistencia de la resina compuesta y los sistemas de matrices en forma simultánea. El riesgo de sesgo para los estudios fue bajo para 1 artículo, medio para 2 y alto para los otros 2 artículos. No se obtiene la misma intensidad de punto de contacto entre diferentes consistencias de resina compuesta y distintos sistemas de matrices, ya que los mayores valores se obtuvieron al utilizar matrices seccionales combinadas con anillo de separación y resinas compuestas de mayor viscosidad.
ABSTRACT: Factors such as the type of composite resin and matrix system are key to achieving an adequate proximal contact tightness, which can determine the success of a class II restoration.To compare the proximal contact tightness obtained in class II resin restorations, when different consistencies of composite resins and matrix systems are used, on in vitro studies. The systematic review was carried out according to the PRISMA Statement guidelines. The studies were selected through a search strategy for each electronic database (MEDLINE/PubMed, Scopus, Web of Science and EBSCO host). In each selected article, the following were tabulated: author/year, sample size, tooth used and cavity preparation, type of composite resin, type of matrix system and proximal contact tightness (result measured in Newton). The methodological quality was analyzed using a modified guideline for in vitro studies. Of 90 articles, a total of 5 articles met the selection criteria and were included. Of these five articles, only two articles studied the influence of the consistency of the composite resin and the matrix systems simultaneously. One of the articles was a low risk of bias, two of medium and two of high. The same proximal contact tightness is not obtained between different consistencies of composite resin and different matrix systems, since the highest values were obtained when using sectional matrices combined with a separation ring and composite resins of higher viscosity.
ABSTRACT
The study compared the proximal contact strength (CS) of different fixed dental prosthesis (FDP) materials. Materials and Methods: Thirty volunteers participated in this study with definitive inclusion and exclusion criteria. Participants were divided into full metal, zirconia, and metal ceramic groups. The CS between the natural teeth and the maxillary posterior quadrant FDP was measured with force gauge. The data were evaluated with one-way analysis of variance test, and Tukey's honest significant difference post hoc was done to compare the mean values. Paired samples t-test was used to compare the mean values between pre- and postoperative CS. Results: The postoperative CS observed in the full metal group in premolar was 0.320 ± 0.1092 N and in second molar was 0.385 ± 0.1130 N. CS obtained with zirconia FDP in both premolar (0.679 ± 0.0927 N) and molar (0.770 ± 0.0960 N) was highest among all groups. The results were statistically significant (P < 0.001). Conclusion: Postoperative CS was greater in zirconia when compared with metal and metal ceramic FDP. Clinical Relevance: FDP materials had acceptable CS. Zirconia is preferable for optimal CS.
ABSTRACT
STATEMENT OF PROBLEM: Proper proximal contact is important for maintaining and stabilizing the dental arch. However, the proximal contact strength (PCS) is not a constant value and can be affected by a variety of factors. PURPOSE: This study examined the influences of postural changes on the posterior PCS. MATERIAL AND METHODS: Twelve adults with a normal occlusion and had not undergone prosthetic treatment or proximal restoration were participated in this study. A metal strip was inserted into the proximal surface and removed at a constant velocity. The contact strength was measured in every contact point between canine to second molar in both arches. The PCSs were obtained initially in the upright position, secondly in the supine position and finally in the upright position again. All measurements were repeated after a 2 hour period. Statistical analysis was carried out using the Friedman test (P < .05). RESULTS: Generally, a decrease in PCS occurred when the posture was changed from the initial upright to supine position, while it increased when the posture was changed from the supine to upright position. A significant change was observed in all areas except for between the canine-first premolar in the maxilla and between the first molarsecond molar in the mandible areas. CONCLUSION: The posterior PCS, which dentists generally believe to be a static feature of occlusion, is affected significantly by posture.