ABSTRACT
Cytotoxic and pro-inflammatory effects of mini-screws subject to corrosion in oral cells culture. To analysis the products of corrosion of three different commercial orthodontic mini-screws and evaluate the cytotoxicity and pro-inflammatory effects in culture with human gingival fibroblast cells (HGFs) and human osteoblast-like bone surface cells (HBCs). An experimental in vitro study was carried out with 3 different type of mini-screws: Vector-Tas®, Forestadent ORTHOEasy®, Bio-Ray® (n = 30/gp). The samples were subjected to accelerated corrosion for 24, 48, 72 and 96 hours, which were observed with a stereomicroscope and scanning electron microscope. The corrosion products were analyzed by inductively coupled plasma with mass spectrometry. The direct and indirect cytotoxicity was tested in culture with HGFs and HBCs, cell viability was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. The pro-inflammatory effect was determined by the expression of prostaglandin E2 (PGE2) with the ELISA test. The data were subjected to Shapiro-Wilks normality tests, paired t-tests and Tukey's post hoc ANOVA. The mini-screw topography showed significant morphological changes after corrosion. The main ions after corrosion were Al, Ti, and Fe. Corrosion products by direct and indirect contact with cells slightly reduced (P < 0.05) cell viability, considered non-cytotoxic. The expression of PGE2 was not increased by the presence of the corrosion products even in a previous pro-inflammatory state. The corrosion products were not cytotoxic and did not induce a pro-inflammatory state in culture with HGFs and HBCs.
Subject(s)
Bone Screws , Titanium , Cell Culture Techniques , Corrosion , Humans , OsteoblastsABSTRACT
En este informe de caso clínico se muestra el tratamiento exitoso de un paciente con anodoncia parcial de órganos dentales 13 y 23 debido a que fueron extraídos por presentar impactación y mal pronóstico de tracción. En este artículo se presenta un paciente masculino de 29 años clase I esquelética con un perfil convexo, maloclusión de clase III, overjet disminuido, ausencia de guías funcionales, discrepancia oseodentaria positiva en arcada superior y negativa en arcada inferior. El tratamiento se realizó con extracciones de los órganos dentales 34 y 44 para nivelar las discrepancias óseo dentarias interarcadas, se llevó a cabo mediante un cierre de espacios recíproco por medio de cadenas elásticas para ambas arcadas, con lo que se logró crear un overjet y overbite adecuados. La creación de las guías caninas funcionales se consiguió mediante el cambio de morfología de los órganos dentales 14 y 24, los cuales fueron llevados a la posición de los caninos ausentes. El tiempo total de tratamiento para este paciente fue de 24 meses. Se realizaron ameloplastias positivas, la aplicación de agregados de resina para mejorar la funcionalidad y proveer salud articular. Se sugiere que ante casos de anodoncia de caninos en la arcada superior, un tratamiento favorable se puede llevar a cabo mediante el cierre de espacios, la caracterización morfológica de los caninos ausentes mediante ameloplastias positivas en premolares (AU)
This case report shows the successful treatment of a patient with partial anodontia of dental organs 13 and 23 because they have been extracted due to present impactation and poor traction prognosis. This article presents a 29-year-old male class I skeletal patient with convex profile, class III malocclusion, overjet reduction, absence of functional guidance, positive bone-teeth discrepancy in the upper arch and negative in the lower arch. The treatment was carried out with the extractions of the dental organs 34 and 44 for correcting oral dental discrepancies between upper and lower arches; it was done using reciprocal closing of spaces by using elastic chains for both arches in order to achieve a suitable overjet and overbite. The creation of the canine guides was achieved by changing the morphology of the dental organs 14 and 24, which were taken to the position of the absent canines. The total treatment timing for this patient was 24 months. Positive ameloplasties were performed by application of resin aggregates to improve functionality and provide joint health. A favorable treatment for these kinds of cases of canine anodontics in the upper arch is carried out by closing spaces and the morphological characterization of the absent canines by positive in-premolar ameloplasties (AU)
