Aplicación del Mantenimiento Autónomo para mejorar los indicadores de la eficiencia global del equipo en la empresa Grúas América S.A.C. Santa Anita, 2017

El presente trabajo de investigación tuvo como finalidad la aplicación del mantenimiento autónomo para mejorar los indicadores de la eficiencia global del equipo en la empresa Grúas América S.A.C. Santa Anita, 2017. El diseño de la investigación fue cuasiexperimental ya que se manipulará la variable independiente (mantenimiento autónomo) para obtener y observar el efecto en la variable dependiente (eficiencia global del equipo); de tipo aplicada, porque se realiza una comparación de resultado de un antes y un después. Teniendo como población y muestra a 12 semanas antes y 12 semanas después, el tipo de muestreo es no probabilístico ya que no se utilizarán fórmulas para la obtención de la muestra. La recolección de estos datos se realizó mediante hojas de registro de la empresa Grúas América S.A.C. en el área de operaciones, se adaptó a los alcances del estudio aplicativo, buscando determinar si la aplicación del mantenimiento autónomo mejora los indicadores de la eficiencia global del equipo. Se llegó a la conclusión que una buena gestión del mantenimiento autónomo incrementa significativamente los indicadores de la eficiencia global del equipo conforme se puede evidenciar en el cuadro N°3 de la página 47, en donde el incremento fue de un 43.75%

Changes in Color Stability and Surface Roughness of Teflon-Coated Arch Wires After Clinical Use

Objective:Peeling of polytetrafluoroethylene (Teflon)-coated esthetic arch wires results in rough surfaces that may cause plaque accumulation, and the exposed core material may not meet the esthetic expectations of patients. The aim of this study was to evaluate the in-vivo surface roughness, Streptococcus mutans colonization, and color stability of Teflon-coated arch wires from 3 different manufacturers.Methods:Surface roughness and color data of 0.016-inch and 0.016 × 0.022-inch Teflon-coated arch wires from 3 different manufacturers were recorded as they were received (T0) and after 28 days of clinical exposure (retrieved) (T1) using an atomic force microscope and a spectrophotometer. The amount of S. mutans was assessed in terms of colony-forming units on the as-received and retrieved wires.Results:The surface roughness increased significantly, and a clinically noticeable color change was observed in all groups after clinical use (P < .005). There was no statistically significant difference in the amount of S. mutans adhesion for most of the wires. No significant correlation was found between the amount of S. mutans adhesion and the surface roughness.Conclusion:All the arch wires showed increased surface roughness and clinically noticeable color change. The surface roughness values were not found to be correlated with the amount of S. mutans adhesion

The Accuracy of Information about Orthodontics Available on the Internet

Objective:The aim of the present study was to evaluate the content of the informative websites related to orthodontic terms in Turkish and in English.Methods:Five different orthodontic terms (“orthodontic appliances (ortodontik aygıtlar),” “orthodontic braces (ortodontik braketler),” “orthodontic elastics (ortodontik elastikler),” “orthognathic surgery (ortognatik cerrahi),” and “orthodontic treatment (ortodontik tedavi)”) both in Turkish and in English were searched using Google. There were 25 websites evaluated for each term. A total of 137 different websites were evaluated with three measurement tools: DISCERN (questionnaire, University of Oxford, 1999) (quality of information), LIDA (v1.2 Minervation, 2007) (accessibility, usability, and reliability), and AChecker (v0.1 ATutor, 2011) (accessibility).Results:The mean overall score of the quality of information was “good” for terms in Turkish and in English. The LIDA score was classified as “moderate” for terms in Turkish and in English. More accessibility errors were found on the Turkish websites than on the English counterparts. Most of the statistical evaluations between Turkish and English terms were insignificant. However, intragroup evaluation of the terms mostly showed significant differences.Conclusion:Accessibility, usability, and reliability; quality of information; and scores of access errors showed variations among Turkish and English sites. The collaboration of website designers and clinicians to increase the quality level of the websites is recommended

Stress Distribution and Displacement of Craniofacial Structures Following Rapid Maxillary Expansion in Different Types of Cleft Palate: A Three-Dimensional FEM Study

Objective: To evaluate displacements and stress distributions in finite element models (FEMs) of the craniofacial complex of 13-yearold male patient with complete unilateral cleft palate (UCP), a 15-year-old female patient with complete bilateral cleft palate (BCP), and a 15-year-old female patient with isolated cleft palate (ICP), which may respond differently to expansive forces.Methods: The FEMs were based on computed tomography scans of patients with UCP, BCP, and ICP who needed maxillary expansion. Von Mises stress distribution after 0.2 mm of expansion and displacements after 5 mm of expansion were investigated.Results: The highest amount of stress was observed in the ICP model. Surprisingly, no stress was noted around the nose in the BCP model. The amount of dentoalveolar expansion decreased from anterior to posterior on the cleft side of the UCP, BCP, and ICP models. In contrast, on the non-cleft side of the UCP model, the maximum dentoalveolar expansion occurred at the molar area, decreasing toward the anterior parts. Anatomical structures expressed posterior displacement in the UCP model. In the ICP model, structures close to midline showed anterior displacement, while structures in the lateral parts showed posterior displacement. In contrast with the other 2 models, the structures in the BCP model showed anterior displacement. Vertically, all the anatomic structures in the BCP model showed inferior displacement, while in the ICP and UCP models, only the structures close to the midline showed inferior displacement.Conclusion: Maxillary expansion caused different patterns of stress distribution and displacement in different types of clefts. Clinicians should consider the type of the cleft, and may expect differing patterns of widening following maxillary expansion

Evaluation of Initial Stress Distribution and Displacement Pattern of Craniofacial Structures with 3 Different Rapid Maxillary Expansion Appliance Models: A 3-dimensional Finite Element Analysis

Objective: This study aimed to describe the displacement of anatomical structures and the stress distributions caused by the Hyrax, fan-type, and double-hinged expansion screws via the 3-dimensional (3D) finite element method (FEM).Methods: The 3D FEM was based on the computed tomography data of a 12-year-old patient with a constricted maxilla. The Hyrax model included 1,800,981 tetrahedral elements with 2,758,217 nodes. The fan-type model included 1,787,558 tetrahedral elements with 2,737,358 nodes. The double-hinged model included 1,777,080 tetrahedral elements with 2,722,771 nodes. The von Mises stress distributions after 0.2 mm of expansion and displacement patterns after 5 mm of expansion were evaluated.Results: The highest stress accumulation was observed in the sutura zygomatico maxillaris area with all 3 appliances. An increase in stress was noted at the pterygomaxillary fissure, the medial and lateral pterygoid process of the sphenoid bone, and the nasal areas. The wedge-shaped skeletal opening was observed with all 3 appliances. In the transverse plane, maximum posterior expansion was achieved with the Hyrax appliance, whereas the maximum anterior expansion was observed with the double-hinged appliance. The maxilla moved inferiorly and anteriorly with all the 3 appliances. The greatest inferior displacement of the maxilla was recorded with the Hyrax appliance, whereas anterior maxillary displacement was the greatest with the double-hinged appliance.Conclusion: All the appliances showed similar stress distributions. The use of double-hinged screw caused a slight anterior displacement of point A. The fan-type and double-hinged appliances were shown to be more effective on anterior maxillary constriction, whereas the Hyrax appliance might be chosen for resolving maxillary posterior constriction

Comparison of Postoperative Condylar Functions of Orthognathic Surgery Patients with Control Subjects Using SAM Axiograph

Aim:The aim of this study is to compare temporomandibular joint tracings of healthy individuals, who do not manifest any TMD symptoms, with those of the patients who have undergone orthognathic surgery operations after a certain period of time.Subjects and Methods:Fifty adults who have undergone orthognathic surgery operations have been divided into subgroups in accordance with the type of surgery plan and they were compared with the control group without any TMJD, as well as with the other surgery subgroups. SPSS packed programe's Student's t test were used for the statistical analysis.Results:Significant tracing widening and shortening was observed in the advancement surgery and setback surgery groups compared to the control group. Especially the postoperative data of mandibular advancement cases showed reduced mobility and more discrepancy in width compared to the control group and mandibular setback group.Conclusion:Patients, who have undergone advancement surgery, have to be analyzed carefully since these patients are more prone to develop TMDS. None of the patients among mandibular advancement surgery group in our study needed help for their current status. This study shows that after orthognathic surgery, lower jaw movements are more limited and less reproducible, and these results are even more severe in mandibular advancement surgery cases

Comment on "The European response to the WHO call to eliminate cervical cancer as a public health problem"

Funding Information: This work was supported through grant EMP416 from the EEA (European Economic Area) and Norway Grants.publishersversionPeer reviewe

Is There a Relationship between Maxillary Sinus Findings and Skeletal Malocclusion?

Objective:No study has investigated the relationship between maxillary sinus findings and skeletal malocclusion based on conebeam computed tomography (CBCT). The aim of the present study was to determine the relationship between the frequency of sinus findings and patients’ skeletal malocclusion classification.Objective: No study has investigated the relationship between maxillary sinus findings and skeletal malocclusion based on conebeam computed tomography (CBCT). The aim of the present study was to determine the relationship between the frequency of sinus findings and patients’ skeletal malocclusion classification.Methods:A total of 105 CBCT scans were examined and divided into three groups according to skeletal classification. Two experienced observers reviewed the CBCT images and recorded all the maxillary sinus findings. The patients’ skeletal malocclusion, thickness of the Schneiderian membrane, and pathological sinus findings were evaluated.Results:The sinus findings were classified into four groups: 0=no finding, 1=mucosal thickening, 2=partial opacification with liquid accumulation, and 3=total opacification. Statistical analysis showed that there was no correlation between the skeletal malocclusion and pathological sinus findings. However, there were significant differences in the Schneiderian membrane thickness between the groups.Conclusion:The Schneiderian membrane thickness was significantly different in Class II and Class III patients. There was no relationship between pathological sinus findings and skeletal malocclusions

Is There a Relationship Between Maxillary Sinus Findings and Skeletal Malocclusion?

Objective:No study has investigated the relationship between maxillary sinus findings and skeletal malocclusion based on conebeam computed tomography (CBCT). The objectives of this study were to determine the relationship between the frequency of sinus findings and patients’ skeletal malocclusion classification.Materials and Method:A total of 105 CBCTscans were examined and divided into 3 groups according to skeletal classification. Two experienced observers reviewed the CBCT images and recorded all maxillary sinus findings. The patients’ skeletal malocclusion, the thickness of the Schneiderian membrane, and the pathologic sinus findings were evaluated.Results:The sinus findings were classified into 4 groups: 0 = no finding, 1 = mucosal thickening, 2 = partial opacification with liquid accumulation, and 3 = total opacification. The statistical analysis showed that there was no correlation between the skeletal malocclusion and pathological sinus findings. However, there were significant differences in the Schneiderian membrane thicknesses between the groups.Conclusion:The Schneiderian membrane thickness was significantly different for Class II and Class III patients. There was no relationship between pathological sinus findings and skeletal malocclusions