RESUMEN
The aim of this meta-analysis was to verify the clinical viability of single implant-retained mandibular overdentures (SIMO). An electronic search of the PubMed and Cochrane databases was performed (end date July 2017); this was supplemented by a manual search of the literature. Only prospective clinical trials and randomized controlled trials (RCTs) that evaluated SIMO with a minimum follow-up of 12 months were included. The meta-analysis was based on the Mantel-Haenszel method. Dental implant and prosthetic failure were the dichotomous outcome measures; these were evaluated through the risk ratio (RR) and odds ratio (OR), with corresponding 95% confidence intervals (CI). Of 499 articles identified, nine fulfilled the inclusion criteria. A total of 205 implants were placed in patients with a mean age of 64.1 years; the cumulative survival rate was 96.6% over a mean follow-up period of 37.3 months. The procedure used (SIMO vs. two implant-retained mandibular overdenture) did not affect dental implant failure (P=0.45) or prosthetic failure (P=0.65): RR 1.06 (95% CI 0.91-1.23) and RR 0.88 (95% CI 0.51-1.51), respectively; OR 2.56 (95% CI 0.27-24.39; P=0.41) and OR 0.44 (95% CI 0.15-1.26; P=0.13), respectively. Within the limitations of this systematic review and meta-analysis, SIMO with a complete denture as the opposing arch may be considered an alternative treatment for completely edentulous patients. However, this study also confirmed the need for more RCTs on this topic.
Asunto(s)
Prótesis Dental de Soporte Implantado , Prótesis de Recubrimiento , Mandíbula , Implantes Dentales de Diente Único , Diseño de Prótesis Dental , Fracaso de la Restauración Dental , HumanosRESUMEN
The aim of this study was to perform a systematic review and meta-analysis to evaluate the possible benefits of platform-switching (PSW) implants when compared to regular platform (RP) implants in the categories of bone preservation and longevity. This systematic review and meta-analysis was performed in accordance with the PRISMA statement, PICO question, and Jadad scale. The relative risk (RR) of failure and the mean difference for marginal bone loss were calculated considering a confidence interval (CI) of 95%. Heterogeneity and subgroup analyses were performed, and funnel plots drawn. Twenty-five studies (17 randomized controlled trials (RCTs) and eight prospective studies) involving 1098 patients and 2310 implants were analysed. The meta-analysis revealed a significant reduction in crestal bone loss for PSW implants compared with RP implants (-0.41mm, 95% CI -0.52 to -0.29, P<0.00001). However, there was no statistically significant difference in implant failure (RR 1.10, 95% CI 0.6-2.02, P=0.75). A reduction in bone loss with PSW implants was observed for the following subgroups: RCTs only, implants in the maxilla, and implants in the mandible. PSW implants presented lower bone resorption compared with RP implants. RCTs should be done to explain the possible biases.
Asunto(s)
Pérdida de Hueso Alveolar/prevención & control , Diseño de Implante Dental-Pilar , HumanosRESUMEN
The retaining screw of the implant-supported dental prosthesis is the weakest point of the crown/implant system. Furthermore, crown height is another important factor that may increase the lever arm. Therefore, the aim of this study was to assess the stress distribution in implant prosthetic screws with different heights of the clinical crown of the prosthesis using the method of three-dimensional finite element analysis. Three models were created with implants (3.75 mm × 10 mm) and crowns (heights of 10, 12.5 and 15 mm). The results were visualised by means of von Mises stress maps that increased the crown heights. The screw structure exhibited higher levels of stresses in the oblique load. The oblique loading resulted in higher stress concentration when compared with the axial loading. It is concluded that the increase of the crown was damaging to the stress distribution on the screw, mainly in oblique loading.
Asunto(s)
Implantes Dentales , Retención de Prótesis Dentales/instrumentación , Prótesis Dental de Soporte Implantado/instrumentación , Análisis de Elementos Finitos , Humanos , Estrés MecánicoRESUMEN
The aim of this systematic review was to identify clinical studies on implants placed in the tuberosity region to determine the survival rate of these implants when compared to implants placed in other regions of the maxilla. A search for data published up until March 2014 was undertaken using the PubMed, Cochrane Library, Embase, and ScienceDirect databases. Eligible studies were selected according to inclusion and exclusion criteria. The first database search revealed 310 titles. After inclusion and exclusion criteria were applied, five studies remained for the detailed analysis. A total of 113 patients were followed for a period of 6-144 months; 289 implants were placed in the patients evaluated. There were eight failures/losses of dental implants in the tuberosity region; the overall survival rate was 94.63% for these implants. In controlled studies, the cumulative survival rates for implants placed in the maxillary tuberosity and other maxillary regions were 96.1% and 95%, respectively. In conclusion, implants placed into the maxillary tuberosity are a predictable alternative for the treatment of patients with insufficient bone volume in the maxillary region. However, randomized trials are needed to assess the effectiveness of this treatment.
Asunto(s)
Implantación Dental Endoósea/métodos , Implantes Dentales , Maxilar/cirugía , Pérdida de Hueso Alveolar , Diseño de Prótesis Dental , Fracaso de la Restauración Dental , Humanos , OseointegraciónRESUMEN
Bone quality and quantity are important factors with regard to the survival rate of dental implants. The aim of this study was to conduct a systematic review of dental implants inserted in low-density bone and to determine the survival rate of dental implants with surface treatments over time. A systematic review of the literature was undertaken by two independent individuals; the Medline/PubMed database was searched for the period July 1975 to March 2013. Relevant reports on bone quality and osseointegration of dental implants were selected. The search retrieved 1018 references, and after inclusion and exclusion criteria were applied, 19 studies were selected for review. A total of 3937 patients, who had received a total of 12,465 dental implants, were analyzed. The survival rates of dental implants according to the bone density were: type I, 97.6%; type II, 96.2%; type III, 96.5%; and type IV, 88.8%. The survival rate of treated surface implants inserted in low-density bone was higher (97.1%) than that of machined surface implants (91.6%). Surface-treated dental implants inserted in low-density bone have a high survival rate and may be indicated for oral rehabilitation. However, more randomized studies are required to better evaluate this issue.
Asunto(s)
Implantación Dental Endoósea , Implantes Dentales , Retención de Prótesis Dentales , Densidad Ósea , Diseño de Prótesis Dental , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Humanos , Oseointegración , Propiedades de SuperficieRESUMEN
The purpose of this systematic review was to evaluate clinical studies on the follow-up survival of implants inserted in the zygomatic bone for maxillary rehabilitation. A comprehensive search of studies published from 2000 to July 2012 and listed in the PubMed/MEDLINE, Embase, and Cochrane Library databases was performed in accordance with the PRISMA statement. Relevant studies were selected according to predetermined inclusion and exclusion criteria. The initial database search yielded 751 titles. After filtering, 313 abstracts were selected, culminating in 42 full text articles. Application of eligibility criteria led to the elimination of 17 articles. Hence 25 full-text articles were considered clinically relevant and were included. Calculations of the interval survival rates and cumulative survival rates of implants could be carried out on the data extracted from the final list of included studies for the different time intervals. These studies reported the insertion of a total of 1541 zygomatic implants and 33 implant failures. Failure generally occurred during the first year interval and was related to clinical complications, such as recurrent acute and chronic sinusitis. After a 36-month follow-up, the survival rate was 97.86%. Additional studies with longer follow-up periods, including the number of zygomatic implants inserted and details of the variations in the surgical techniques used and the impact of the maxillary morphology are still required.
Asunto(s)
Implantación Dental Endoósea/métodos , Implantes Dentales , Fracaso de la Restauración Dental , Arcada Edéntula/rehabilitación , Maxilar/cirugía , Procedimientos Quirúrgicos Preprotésicos Orales/métodos , Cigoma/cirugía , Prótesis Dental de Soporte Implantado , Humanos , Resultado del TratamientoRESUMEN
The Almendares River is the most important surface water body of the Cuban capital, Havana. In the present work, the environmental quality of waters was studied as a function of the following 14 variables: content of calcium, cadmium, iron, potassium, magnesium, manganese, sodium, nickel, zinc, chlorine, bicarbonate, and sulfate; pH; and electric conductivity parameters, which were reduced to three new variables by means of principal component analysis (PCA). The content of metal increased in waters sampled at stations located near garbage dumps and decreased inside the Ejercito Rebelde dam. The variation of the river water environmental quality with rainy and dry seasons and the differentiation of samples in three groups along the river course were obtained by PCA and corroborated by discriminant analysis. Applied statistical techniques showed their ability for environmental interpretation of limited experimental data.
Asunto(s)
Metales Pesados/análisis , Ríos/química , Contaminantes Químicos del Agua/análisis , Cuba , Análisis Discriminante , Monitoreo del Ambiente/estadística & datos numéricos , Análisis Multivariante , Análisis de Componente PrincipalRESUMEN
AIM: While it is well-known that there is 18F-FDG uptake in breast tumors, clinical impact of (18)F-FDG PET in managing breast cancer patients is not well-studied. METHODS: One hundred and thirty-three consecutive breast cancer patients from May 1996 to June 2000 were studied. All patients were treated and being followed. Reasons of referral included equivocal conventional studies, staging/re-staging, clinical suspicion of recurrence, and elevated serum tumor markers. Clinical status at 6 months postPET is used as the gold standard in lesions of worsening versus stable or improving. RESULTS: PET was 69% sensitive and 80% specific in predicting clinical stage at 6 months. This 69% of the patients who got worse at 6 months was PET positive and 80% of the patients who were stable or improving at 6 months were PET negative. There was a significant association between PET results and clinical outcome, after adjusting for stage of disease (P=0.04), or for the treatment patients received (P<0.01). Negative PET results changed therapy as often as positive ones did. PET influenced treatment decisions in 74% of the patients referred for study. CONCLUSIONS: PET holds promise as a sensitive and specific modality in following treated breast cancer patients. PET results contain information on 6 month outcome that is independent of stage or past treatment and influence patient management.
Asunto(s)
Neoplasias de la Mama/diagnóstico por imagen , Neoplasias de la Mama/epidemiología , Fluorodesoxiglucosa F18 , Tomografía de Emisión de Positrones/estadística & datos numéricos , Pautas de la Práctica en Medicina/estadística & datos numéricos , Adulto , Anciano , Anciano de 80 o más Años , Neoplasias de la Mama/terapia , Femenino , Humanos , Incidencia , Persona de Mediana Edad , Pronóstico , Radiofármacos , Reproducibilidad de los Resultados , Estudios Retrospectivos , Medición de Riesgo/métodos , Factores de Riesgo , Sensibilidad y Especificidad , Estados Unidos/epidemiologíaRESUMEN
AIM OF THE STUDY: To assess the impact of repeated F-18 FDG studies on the management of patients with bone and soft tissue (B&S) sarcomas. MATERIAL AND METHODS: Twenty patients with B&S tissue tumors (11 M and 9 F age 17-72 years) had 52 F-18 FDG Dual Head Coincidence Imaging (DHCI) studies. 7 patients were followed for 6 months to 2 years clinically after removal of the primary tumor. Thirteen patients were evaluated for suspected recurrences. Patient's preparation, F-18 FDG injection and imaging procedure were done according to department protocol. Attenuation corrected images were interpreted visually by 3 trained physicians. Tumor to background ratios were calculated for all lesions. RESULTS: In 13 patients having both studies, baseline FDG and CT/MRI were concordant in 8 patients, FDG detected more lesions in 3 patients but it did not detect 4 metastatic pulmonary nodules in 2 patients. Follow up studies showed stable disease in 10 patients while 6 patients who showed worsening disease needed to change their chemotherapy. Surgery was avoided in 2 patients and 2 patients showed improved response. CONCLUSION: Repeated F-18 FDG DHCI examinations proved to have an impact on the clinical management of patients with malignant bone and soft tissue sarcoma. It helps to differentiate postoperative changes from local recurrence.
Asunto(s)
Neoplasias Óseas/diagnóstico por imagen , Fluorodesoxiglucosa F18 , Metástasis de la Neoplasia/diagnóstico por imagen , Recurrencia Local de Neoplasia/diagnóstico por imagen , Radiofármacos , Sarcoma/diagnóstico por imagen , Neoplasias de los Tejidos Blandos/diagnóstico por imagen , Tomografía Computarizada de Emisión , Adolescente , Neoplasias de las Glándulas Suprarrenales/diagnóstico por imagen , Neoplasias de las Glándulas Suprarrenales/secundario , Adulto , Anciano , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Neoplasias Óseas/tratamiento farmacológico , Neoplasias Óseas/cirugía , Terapia Combinada , Progresión de la Enfermedad , Femenino , Estudios de Seguimiento , Humanos , Neoplasias Pulmonares/diagnóstico por imagen , Neoplasias Pulmonares/secundario , Masculino , Persona de Mediana Edad , Postura , Estudios Retrospectivos , Sarcoma/tratamiento farmacológico , Sarcoma/secundario , Sarcoma/cirugía , Neoplasias de los Tejidos Blandos/tratamiento farmacológico , Neoplasias de los Tejidos Blandos/cirugíaRESUMEN
The authors report the findings of a radionuclide diuretic renogram in a patient with markedly dilated pelves bilaterally that filled most of the abdominal cavity. With the patient in the sitting position, at the end of the furosemide injection, there was good delineation and filling of the dilated calyces. These findings are unusual because of the extensive pelvicaliceal dilatation, and they emphasize the importance of the sitting position.
Asunto(s)
Enfermedades Renales/diagnóstico por imagen , Pelvis Renal/diagnóstico por imagen , Radiofármacos , Tecnecio Tc 99m Mertiatida , Anciano , Dilatación Patológica/diagnóstico por imagen , Diuréticos , Furosemida , Humanos , Cálices Renales/diagnóstico por imagen , Masculino , Postura , CintigrafíaRESUMEN
The authors describe a patient with the acquired immunodeficiency syndrome who had active pulmonary tuberculosis and was receiving anti-tuberculosis treatment. High-grade fever and a right-sided pleural effusion had recently developed. Results of a Ga-67 scan were negative for any focal infection in the chest. Fluorine-18 fluorodeoxyglucose positron emission tomography showed increased uptake in the right lower lung field, which correlated with the diagnosis of concomitant bacterial pneumonia. Anti-tuberculosis treatment can decrease the sensitivity of the Ga-67 scan and could have contributed to this discrepancy. The authors predict that the fluorine-18 fluorodeoxyglucose positron emission tomographic scan will play an important diagnostic role in the management of such a selected group of patients.