scholarly journals Аналіз методів оцінки та впливу полірованості композитних матеріалів на функціональний прогноз реставрацій

Author(s):  
S. B. Kostenko ◽  
I. Y. Hangur ◽  
I. V. Sorokopud ◽  
M. Y. Goncharuk-Khomyn ◽  
G. N. Nakashidze

Summary. Among the proposed USPHS criteria approved by FDI, the level of gloss and polishing of restorations plays a key role in preventing not only such complications  as disocorporations or changes in their texture in the future, but also preventing secondary caries and sealing disintegration, since areas with high roughness play the role of retention points for the accumulation of bacterial plaque and the further progression of the above-described complications.The aim of the study – to analyze the methods for assessing the quality of polishing composite restorations and to determine the role of influence roughness factor of their surface on the prediction of their functioning and change of color stability parameters, formation of biofilm and shine.Materials and Methods. Search of publications related to the topic of this analysis was conducted by the Google Scholar search engine by the keywords "roughness", "polishing", "composite restorations" and their analogues in English. The depth of search, taking into account the age of key articles, determined by the level of their citation in later periodicals, did not exceed 15 years. In order to organize the received data, Microsoft Excel 2016 (Microsoft Office) table editor was used to group  pre-selected articles based on the results of the provided content analysis.Results and Discussion. In the course of the analysis, it was established that the basic laboratory methods for assessing the roughness of the restoration surface, as an indicator of the quality of polishing, are atomic force microscopy, scanning electron microscopy and profilometry. Most often, in order to verify the aforementioned parameter in the analyzed studies, the Ra value of mean arithmetic deviation of the profile was used, on the basis of which analysis it was possible to determine the dependence of the possibilities for achieving the corresponding level of restoration polishing on the structure of the composite material used, the system and phases of polishing, and the tribological nature of the interaction of the polishing system and the surface of the restoration.Conclusions. The results of the analysis show that the data obtained in the course of previous clinical and laboratory studies dedicated to the effect of polishing on various restoration parameters are debatable and a more specific systematization is required, with the selection of the investigated aspects of brightness, roughness, color stability and functional prediction changes due to the polishing method in separate independent subjects for research, with further phased combination of them after obtaining unambiguous numerical data, subjected to appropriate objective interpretation.

2021 ◽  
Vol 5 (2) ◽  
pp. 268
Author(s):  
Sarlota Singerin

Teaching skills are one of the skills that must be possessed by a teacher. Whether or not the pedagogical competence possessed by teachers can be seen from the quality of school performance. Supervision still tends to lead to inspection. So far, the implementation of academic supervision is considered effective. In order for the Academic Supervision to provide objective and detailed results, collaborative self-evaluation is carried out, namely peer evaluation to find teacher strengths that need to be maintained and deficiencies that must be corrected. This study aims to determine the effect of collaboration-based Academic Supervision model with Peer Evaluation Approach to Improve Pedagogical Competence and Quality of School Performance: The Role of Principal's Motivation as Moderation Variable. This research is a quantitative study with numerical data analyzed using the Structural Equation Model (SEM) assisted by the Smart PLS application. The results showed that Academic Supervision has an effect on Pedagogical Competence with a P-Value of 0.000 (p <0.05). Academic Supervision affects the Quality of Performance with a P value of 0.000 (p <0.05). motivation is able to moderate positively pedagogical competence with a P value of 0.032 (p <0.05). Motivation is not able to moderate supervision of the quality of performance with a P value of 0.138 (p> 0.05). Supervision is able to explain the Pedagogical Competence (Y1) variable of 69.4%. Supervision is able to explain the Performance Quality variable (Y2) of 40.1%. The principal should be able to periodically monitor the learning carried out by the teacher in the classroom, so that the principal knows the problems faced by the teacher in learning. Researchers who want to research further on this topic can use other variables and a wider sample.


2017 ◽  
Vol 42 (6) ◽  
pp. 587-595 ◽  
Author(s):  
J Estay ◽  
J Martín ◽  
P Vildosola ◽  
IA Mjor ◽  
OB Oliveira ◽  
...  

SUMMARY Objectives: The aim of this study was to clinically evaluate posterior amalgam and resin composite restorations refurbished over a period of 12 years by investigating the influence of refurbishing on the survival of restorations and comparing their behaviors with respect to controls. Methods and Materials: Thirty-four patients were enrolled, ages 18 to 80 years, with 174 restorations, 48 restorations of resin composite (RC), and 126 restorations of amalgam (AM). Restorations with localized defects in anatomy, roughness, luster, or marginal staining that were clinically judged as suitable for refurbishing according to US Public Health Service (USPHS) Ryge criteria were assigned to group A—refurbishing (n=85; 67 AM, 18 RC)—or group B—control (n=89; 59 AM, 30 RC); the quality of the restorations was evaluated blindly according to the modified USPHS criteria. Two observers conducted evaluations at the initial state (k=0.74) and after one to five, 10, and 12 years (k=0.88). Wilcoxon, Friedman, and Mantel-Cox tests were performed to compare the groups, respectively. Results: After 12 years, both groups experienced a similar decline, except for an evidently better performance in marginal adaptation in RC control (p=0.043) and in anatomy in AM refurbished (p=0.032). Conclusions: After 12 years, no difference was found in the clinical condition and longevity of the refurbished restorations compared to the control group.


Author(s):  
Mihaela Păpușa Vasiliu ◽  
Liliana Sachelarie ◽  
Laura Ecaterina Romila ◽  
Elena Folescu ◽  
Leonard Atanase ◽  
...  

In this work we accomplished a study concerning the surface state of acrylic prosthetic biomaterials both optimized and non-optimized and we studied their compatibility on test animals. Various methods are seeking to improve the quality of implants and minimally invasive devices for body analysis, the increase of biocompatibility and resistance to corrosion of materials intended to come into contact with biological tissues. Poly (methyl methacrylate) is used in a wide range of applications and offers increased resistance and color stability over time and it can be relatively easy to smooth and polish. The morphology and roughness of the surfaces in case of acrylic prosthetic biomaterials were analyzed by atomic force microscopy that provides qualitative information regarding the chemical uniformity from phase.


2013 ◽  
Vol 21 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Anne Eschen ◽  
Franzisca Zehnder ◽  
Mike Martin

This article introduces Cognitive Health Counseling 40+ (CH.CO40+), an individualized intervention that is conceptually based on the orchestration model of quality-of-life management ( Martin & Kliegel, 2010 ) and aims at improving satisfaction with cognitive health in adults aged 40 years and older. We describe the theoretically deduced characteristics of CH.CO40+, its target group, its multifactorial nature, its individualization, the application of subjective and objective measures, the role of participants as agents of change, and the rationale for choosing participants’ satisfaction with their cognitive health as main outcome variable. A pilot phase with 15 middle-aged and six older adults suggests that CH.CO40+ attracts, and may be particularly suitable for, subjective memory complainers. Implications of the pilot data for the further development of the intervention are discussed.


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