RESUMEN
Abstract Stanozolol (ST) is a synthetic androgen with high anabolic potential. Although it is known that androgens play a positive role in bone metabolism, ST action on bone cells has not been sufficiently tested to support its clinical use for bone augmentation procedures. Objective: This study aimed to assess the effects of ST on osteogenic activity and gene expression in SaOS-2 cells. Material and Methods: SaOS-2 deposition of mineralizing matrix in response to increasing doses of ST (0-1000 nM) was evaluated through Alizarin Red S and Calcein Green staining techniques at 6, 12 and 24 days. Gene expression of runt-related transcription factor 2 (RUNX2), vitamin D receptor (VDR), osteopontin (SPP1) and osteonectin (ON) was analyzed by RT-PCR. Results: ST significantly influenced SaOS-2 osteogenic activity: stainings showed the presence of rounded calcified nodules, which increased both in number and in size over time and depending on ST dose. RT-PCR highlighted ST modulation of genes related to osteogenic differentiation. Conclusions: This study provided encouraging results, showing ST promoted the osteogenic commitment of SaOS-2 cells. Further studies are required to validate these data in primary osteoblasts and to investigate ST molecular pathway of action.
Asunto(s)
Humanos , Osteogénesis/efectos de los fármacos , Estanozolol/farmacología , Expresión Génica/efectos de los fármacos , Anabolizantes/farmacología , Osteoblastos/efectos de los fármacos , Factores de Tiempo , Calcificación Fisiológica/efectos de los fármacos , Modelos Lineales , Osteonectina/análisis , Osteonectina/efectos de los fármacos , Reproducibilidad de los Resultados , Análisis de Varianza , Receptores de Calcitriol/análisis , Receptores de Calcitriol/efectos de los fármacos , Línea Celular Tumoral/efectos de los fármacos , Subunidad alfa 1 del Factor de Unión al Sitio Principal/análisis , Subunidad alfa 1 del Factor de Unión al Sitio Principal/efectos de los fármacos , Osteopontina/análisis , Osteopontina/efectos de los fármacos , Reacción en Cadena en Tiempo Real de la PolimerasaRESUMEN
OBJECTIVES: The goal of this study was to evaluate bone changes around endosseous implants in partially edentulous patients. MATERIALS AND METHODS: A total of 632 two-stage implants were placed in 252 patients. The implants had straight emergence profile, ZirTi surface, 3.3 to 5 mm diameter, and 8.5 to 13 mm length. Bone levels were assessed on orthopantomography immediately after surgery and after 36 months and marginal bone loss (MBL) was calculated from their difference. RESULTS: Cumulative survival rate was 98.73%. Overall MBL was 0.8 mm ± 0.03 (mean ± SEM). Higher MBL was observed around implants in the maxilla than in the mandible (P < 0.007). A relation between implant diameter and MBL (P < 0.0001) was observed in male and, more limitedly, female patients. Older patients had higher MBL in the maxilla, but not in the mandible (P < 0.0001). MBL progressively increased with age in male patients, but reached a peak already in the 50-60 years age group in the female subset (P < 0.001). CONCLUSIONS: The overall MBL is consistent with the available literature. Site difference and patient age and gender appear to significantly affect MBL, representing important factors to be considered during implant placement.
Asunto(s)
Pérdida de Hueso Alveolar/epidemiología , Implantación Endodóntica Endoósea/instrumentación , Implantación Endodóntica Endoósea/estadística & datos numéricos , Implantes Dentales de Diente Único/estadística & datos numéricos , Adaptación Marginal Dental , Arcada Parcialmente Edéntula/epidemiología , Arcada Parcialmente Edéntula/cirugía , Distribución por Edad , Pérdida de Hueso Alveolar/diagnóstico por imagen , Causalidad , Comorbilidad , Fracaso de la Restauración Dental/estadística & datos numéricos , Femenino , Humanos , Incidencia , Italia/epidemiología , Arcada Parcialmente Edéntula/diagnóstico por imagen , Masculino , Persona de Mediana Edad , Complicaciones Posoperatorias/diagnóstico por imagen , Complicaciones Posoperatorias/epidemiología , Radiografía , Factores de Riesgo , Distribución por Sexo , Resultado del TratamientoRESUMEN
TRIAL DESIGN: This analysis compared the outcome of fresh-frozen versus autologous bone block grafts for horizontal ridge augmentation in patients with Cawood and Howell class IV atrophies. METHODS: Seventeen patients received autologous grafts and 21 patients received fresh-frozen bone grafts. Patients underwent CT scans 1 week and 6 months after surgery for graft volume and density analysis. RESULTS: Two autologous and 3 fresh-frozen grafts failed. Autologous and fresh-frozen grafts lost, respectively, 28% and 46% of their initial volume (P = 0.028). It is noteworthy that less dense fresh-frozen blocks lost more volume than denser grafts (61% versus 16%). CONCLUSIONS: According to these 6-month results, only denser fresh-frozen bone graft may be an acceptable alternative to autologous bone for horizontal ridge augmentation. Further studies are needed to investigate its behaviour at longer time points.