Analysis of scientific production in spanish implantology

The aim of the study was to quantify the scientific productivity of researchers, organizations, and regions in Spain that publish articles on implantology in dental journals indexed in Journal Citation Reports. A search was conducted among the core collection of Thomson Reuters? Web of Science database, on the basis of its broad thematic and geographic coverage of health sciences. The search identified original articles ? the main vehicle for the dissemination of research results. The search was conducted in July 2016, applying the truncated search term ?implant*? to locate original articles on implantology and its derivative forms. The search was conducted within the topic field (title, keywords and abstract) and two inclusion criteria were applied: documents denominated as articles were included; and articles categorized as Web of Science Medicine Dentistry and Oral Surgery. Finally only articles for which one of the participating organizations was located in Spain were selected. The final search identified a total of 774 records. The period 1988 to 2015 saw an exponential growth in scientific production, especially during the last 10 years. Clinical Oral Implants Research and Medicina Oral Patologia Oral y Cirugia Bucal (Oral Medicine, Oral Pathology, and Oral Surgery) were the most productive journals. Collaborative networks among authors and among institutions increased and this increase was related to the improving quality of the publications. Bibliometric analysis revealed a significant growth in the quantity and quality of Spanish implantology literature. Most key bibliometric indicators demonstrated upward trends

Relationship between indication for tooth extraction and outcome of immediate implants: a retrospective study with 5 years of follow-up

Objectives: The aims of this retrospective study were to evaluate the survival rate of a series of immediate implants after 3 years of follow-up and to study the relationship between survival and indication for tooth extraction. Study design: A retrospective study of patients treated with immediate implants between January 2003 and Dec - ember 2008 was carried out. All patients receiving at least one post-extraction implant and a minimum follow-up of 5 years were included. Results: After 60 months, 30 immediate implants had been lost in 17 patients, yielding a total implant success rate of 93.8%. None of the implants placed failed after the extraction of included canines (100% success rate). In 20 failed implants the reason for extraction had been severe periodontal disease (91.8% SR), in 4 endodontic failure (88.6%SR), in 3 unrestorable caries (95.9% SR), in 1 untreatable fracture (95.2% SR) and in 2 improvement of prosthetic design (98.1% SR). No statistically significant influence was found between immediate implant failure and the reason for tooth extraction ( p =0.11). Conclusions: The use of immediate implants is a successful alternative to replace missing teeth for severe perio - dontal disease, periapical pathology or by decay or untreatable fractures. Some reasons, such as periodontal disease itself is associated with a success rate significantly below the overall average. Similarly, the prosthetic design is associated with a better prognosis than all other reasons

Anxiety before extraction of impacted lower third molars

Objetives: Assess levels of trait anxiety, state anxiety and dental anxiety before extraction of lower third molars and check the correlation and reliability of the scales used for the measurement of preoperative anxiety. Study D esign: A prospective study of patients treated with extraction of a lower third molar between September 2010 to December 2010 was carried out. A total of 125 patients were included in the study. All of them were patients of the Oral Surgery and Implantology Department (Valencia University Medical and Dental School, Valencia, Spain). Before surgery, patients had to complete a preoperative protocol with 4 scales: the STAI-T (State-Trait Anxiety Inventory-Trait) for measuring trait anxiety, the STAI-S (State-Trait Anxiety Inventory-State) for measuring state anxiety, and DAS (Dental anxiety Scale of N. Corah) and APAIS (Amsterdam Preoperative anxiety and Information Scale) for measuring dental anxiety. Results: Patients undergoing extractions of an impacted lower third molar showed low levels of trait anxiety and moderate levels of state anxiety and dental anxiety. Higher levels of trait anxiety were obtained for older patients. Women had higher mean levels of dental anxiety and state anxiety that men with a statistically significant difference in STAI-S scales, DAS, and APAIS. Patients with higher trait anxiety and state anxiety showed higher levels of dental anxiety. A significant correlation ( p ≤ 0.01) ( p = 0.00) was found between the four scales used to measure anxiety. The scale showed higher correlation was STAI-S scale. The 4 scales showed high reliability (α of C.> 0.80). Conclusion s : Patients with highest levels of trait anxiety and state anxiety, had more dental anxiety. The STAI-T, STAI-S, DAS and APAIS scales provided useful information about anxiety before the extraction of lower impacted third molars. The STAI-S is the scale with highest correlation and reliability

Hemodynamic variations and anxiety during the surgical extraction of impacted lower third molars

The surgical removal of an impacted third molar can cause patient anxiety. Such anxiety and the use of vasoconstrictor drugs and local anesthetics in turn can induce hemodynamic variations during the operation. A study is made of the variations in hemodynamic parameters (systolic and diastolic blood pressure and heart rate) and their correlation to patient gender and anxiety during surgical removal of an impacted lower third molar. A prospective study was carried out in the Oral Surgery Unit of a university clinic, with the inclusion of 125 patients (mean age 24.9 years). Anesthesia was administered in the form of 4% articaine and adrenalin 1:200,000 for surgical removal of the impacted lower third molars. Women experienced greater anxiety than men. Systolic blood pressure showed few changes ? the maximum and minimum values being recorded at the time of incision and upon suturing, respectively. Diastolic blood pressure in turn showed maximum and minimum values before the start of surgery and during extraction, respectively, while heart rate proved maximum during incision and minimum upon suturing. The differences in systolic and diastolic blood pressure, and heart rate, between men and women, and between patients with and without anxiety, failed to reach statistical significance. The fact that these were young patients could contribute to explain the absence of significant hemodynamic changes in our study

Clima familiar y ansiedad escolar en el aprendizaje de la matemática en estudiantes de secundaria San Juan de Lurigancho - 2016

El objetivo de la investigación fue determinar la influencia, del Clima familiar y ansiedad escolar en el aprendizaje de la matemática en los estudiantes del nivel de Educación Secundaria de la Institución Educativa N° 156 El Porvenir, de San Juan de Lurigancho año 2016. Metodológicamente se trata de una investigación básica descriptiva no experimental, correlacional-causal multivariable. Se consideró la muestra a 115 estudiantes, de ambos sexos a una población total de 344 estudiantes de Educación Secundaria de la Institución Educativa N° 156 “El Porvenir, de San Juan de Lurigancho año 2016.Se usó el análisis descriptivo de las variables y el análisis inferencial desarrollado para conocer el nivel de influencia de las hipótesis general como de las especificas mediante la prueba de Regresión lineal. Se llegó a la conclusión de que influyen significativamente el clima familiar y ansiedad escolar en el aprendizaje de la Matemática en los estudiantes de Educación Secundaria de la Institución Educativa N° 156 “El Porvenir, de San Juan de Lurigancho año 2016

Comparative study of mandibular linear measurements obtained by cone beam computed tomography and digital calipers

Objectives: Cone beam computed tomography (CBCT) is an innovative dental of imaging system characterized by rapid volumetric imaging with patient exposure to a single dose of radiation. The present study was carried out to compare the linear measurements obtained with CBCT and digital caliper in 20 mandibles from human cadavers. Study design: A total of 4800 linear measurements were measured between different mandibular anatomical po - ints with CBCT and digital caliper. The real measurements were defined as those obtained with the digital caliper. Posteriorly, the mandibles were scanned to obtain the CBCT images, with software-based measurements of the distances. Results: The measurements obtained with the digital caliper were greater. The CBCT technique underestimated distances greater than 100 mm. Conclusions: CBCT allows to obtain linear mandibular anatomical measurements equivalent to those obtained with digital caliper. The differences existing between both methods were clinically acceptable

Diseño de un sistema de control y pago de peaje por medio de lectores ópticos con identificación vehicular en Perú

Uno de los problemas más agobiantes para la población peruana es el exceso de tráfico vehicular, principalmente en las zonas de peaje, por ello en el presente trabajo de investigación se diseña un sistema automático de control de pago de peaje, haciendo uso la tecnología RFID pasiva, la cual mediante el uso de un lector se encarga de detectar e identificar a un TAG (Tarjeta IC o Llavero NFC) que mediante una antena se energiza cuando se encuentra a una determina frecuencia; de ese modo, el usuario poseerá una tarjeta o llavero según sea de su preferencia, para que al momento de acceder por el peaje pueda mostrarlo y así ser identificado para lograr pasar por la zona de peaje sin problema alguno; desde luego el control de peaje automático puede ser usado de manera indistinta por todos los usuarios, por lo que se muestra indiferente a ciertas características físicas adicionales del vehículo, ello llega a ser un aporte al presente trabajo de investigación, además de ser compatible con cualquier control de acceso como estacionamientos, debido a la frecuencia con la que funciona el presente diseño de investigación; obteniendo como resultado una alta fiabilidad al momento en que el lector identifica a la tarjeta, lo cual dura un tiempo promedio de 0.30 segundos, de tal modo que los resultados experimentales ponen en manifiesto la capacidad de utilizar de manera exitosa una tecnología como el RFID pasivo.Trabajo de investigaciónCampus Lima Centr

Simple modeling of FtsZ polymers on flat and curved surfaces: correlation with experimental in vitro observations

FtsZ is a GTPase that assembles at midcell into a dynamic ring that constricts the membrane to induce cell division in the majority of bacteria, in many archea and several organelles. In vitro, FtsZ polymerizes in a GTP-dependent manner forming a variety of filamentous flexible structures. Based on data derived from the measurement of the in vitro polymerization of Escherichia coli FtsZ cell division protein we have formulated a model in which the fine balance between curvature, flexibility and lateral interactions accounts for structural and dynamic properties of the FtsZ polymers observed with AFM. The experimental results have been used by the model to calibrate the interaction energies and the values obtained indicate that the filaments are very plastic. The extension of the model to explore filament behavior on a cylindrical surface has shown that the FtsZ condensates promoted by lateral interactions can easily form ring structures through minor modulations of either filament curvature or longitudinal bond energies. The condensation of short, monomer exchanging filaments into rings is shown to produce enough force to induce membrane deformations

Influence of root width and dentin wall thickness evaluated by endoscopy upon the outcome of periapical surgery. A cohort study

Background: An analysis was made of the correlation between root width, the thickness of the remaining dentinal wall as determined by endoscopy, and the outcome of periapical surgery. Material and Methods: A retrospective cohort study was carried out involving patients subjected to periapical surgery between 2017 and 2019 at the University of Valencia (Valencia, Spain). One year after surgery, cone-beam computed tomography (CBCT) was used to evaluate healing against the preoperative volumes. The maximum root width was measured on the postoperative CBCT scan at the apical section of the treated root. This measurement was transferred to the intraoperative endoscopic image, where the minimum root width, peripheral dentin thickness, and minimum dentin thickness were recorded. Root measurements, and the position (maxillary or mandibular) and type of tooth (roots of incisors, canines, premolars or molars) were further correlated to periapical surgery outcome. Results: A total of 51 patients, comprising 52 teeth and 62 roots, were included in the study. The mean measurements were: maximum root width (4.13 +/- 0.84 mm), minimum root width (2.46 +/- 0.72 mm), peripheral dentin thickness (0.77 +/- 0.2 mm) and minimum dentin thickness (0.4 +/- 0.2 mm). The success rate was 82.2%. Premolar roots showed a greater minimum dentin thickness (0.58 +/- 0.25 mm) ( p<0.003) than incisor roots. No significant association was found between the different measurements and the healing rate at one year, though the roots that failed to heal showed smaller minimum dentin thickness values than the roots that healed correctly. The position and type of tooth did not influence healing outcome. Conclusions: The root width and thickness of the remaining dentin wall did not significantly influence healing. However, the roots that failed to heal showed smaller minimum dentin thickness values than the roots that healed correctly

Endoscopic findings in periapical surgery. A cross-sectional study of 206 roots

A study is made of the findings of high-magnification rigid endoscopy at the root end surface following apicoectomy of teeth subjected to periapical surgery. A cross-sectional study was made of patients subjected to periapical surgery at the Unit of Oral Surgery and Implantology (University of Valencia, Valencia, Spain) between 2011 and 2019. Following apicoectomy, the root end surfaces were inspected, with the evaluation of untreated canals, isthmuses, craze lines, crack lines, opaque dentin and gaps. Likewise, an analysis was made of the association between patient age and the tooth type and restoration and the presence of craze lines, cracks, opaque dentin and gaps. The final sample consisted of 168 patients subjected to periapical surgery, with 177 operated teeth and 206 roots. Untreated canals were observed in 14 roots (6.8%). Isthmuses were identified in 74 roots (35.9%), particularly in the mesial root of the lower first molar (94.1%). In turn, craze lines were identified in 8.3% of the roots, cracks in 3.9%, and gaps in 53.4%. The prevalence of opaque dentin was 78.3%, with a greater presence in posterior teeth (90.3% in premolars and 86.2% in molars) than in anterior teeth (50.6%) (p<0.001). Patient age and tooth restoration showed no correlation to the studied parameters. Craze lines and crack lines were observed in less than 10% of the roots, though opaque dentin was identified in 73% of the roots, particularly in posterior teeth, and gaps were found in over half of the canals