1,720,970 research outputs found
A successful treatment of implant periapical lesion: surgical re-entry after 12 years from the reconstructive approach
No full textAIM: This poster describes a 12 years follow up case-report of reconstructive bone surgery on Implant Periapical Lesion (IPL).
METHODS: A 49 woman, at 3-month control after #4.6 implant placement, manifested a fistula at the vestibular side of the area. Clinical and radiographic exams led to active IPL diagnosis. The aim was to preserve the entire fixture, eliminating the acute infection at the apical portion of the implant and creating the biological conditions for osseointegration. The surgical-pharmacological treatment was performed in October 2005 at the Department of Periodontology and Implantology of Bologna University. After intrasulcular incision a vestibular full-thickness flap was raised and a careful soft tissue curettage of the defect was carried out. Confirmed the primary stability of the fixture, decontamination of the bone cavity and of the exposed implant portion was performed with a chlorhexidine irrigant. Finally, the area was filled with a particulate allograft added with tetracycline and the flap sutured. Chlorhexidine rinse and antibiotic-analgesic therapy were prescribed.
The healing was uneventful and a complete resolution of the lesion was clinically and radiographically recorded. The minimally invasive approach and the definitive prosthetic finalization led to a full patient satisfaction.
Stability of the result was confirmed for several years until a new periimplantitis scenario manifested. Another surgical approach was consequently planned to treat the periimplantitis.
RESULTS: This surgery allowed a direct observation of the vestibular cortical area confirming a complete resolution of the previous IPL bone lesion.
CONCLUSION: In conclusion this case-report shows that active IPL, even for extensive implant involvement, can be successfully resolved with a “preserving approach”. More clinical confirmations of this observation are anyway demanded
OZONIZED-OIL, POVIDONE-IODINE, CHLORHEXIDINE-DIGLUCONATE AGAINST ORAL-BIOFILM ON MICROSTRUCTURED-TITANIUM SURFACE. AN IN-VITRO COMPARISON.
No full textOBJECTIVES Implant surface decontamination is a crucial aspect for peri-implantitis treatment. The purpose of this preclinical-study was to compare the efficacy of 100% ozonated-oil (O3-OIL) to 0.2% chlorhexidine-digluconate (CHX) and 10% povidone-iodine (PVP-I) against an oral-biofilm developed on a microstructured-titanium surface.
METHODS Four overly-healthy adults with good oral-hygiene and good oral-health were enrolled. Oral-biofilm was formed in-situ on 144 sandblasted titanium specimens (Ra: 1.68). Specimens were fixed on custom-made splints and exposed into the oral cavity overnight (12h). Biofilm-covered specimens were then randomly assigned to four groups: O3-OIL(n=36), CHX(n=36), PVP-I(n=36) and phosphate-buffered-saline (PBS)(n=36) as negative-control. Specimens were tested for a 1min of incubation-time. Viable biofilm was than quantified by bioluminescence on microtiter-plates.
A linear mixed effects model was used to evaluate the influence of the type of antiseptic on the effectiveness, considering as fixed effects the antiseptic and the experiment. The distributive normality of the bioluminescence was evaluated with the Shapiro-Wilk test. The Mann-Whitney U-test was performed for the comparison among the antiseptics. The α significance level was set at 0.05; for the multiple comparisons was applied the Bonferroni correction (α=1.7e-2).
RESULTS Each antiseptic was able to significantly reduce (p<0,001) the oral-biofilm when compared to the negative-control. The comparison among the tested antiseptics reveals that O3-OIL was less effective than both PVP-I (p<0,001) and CHX (p<0,001) against the oral-biofilm. PVP-I and CHX showed to be equally effective against the oral-biofilm since the difference between them is not significant (p=0,386).
CONCLUSIONS The present work contrast with previous promising findings, where O3-OIL resulted as effective as or superior to CHX and PVP-I against planktonic microorganisms. Biofilm seems to be a significant limit to O3-OIL effectiveness. Since a possible explanation could be ascribed to the formulation of the final product and to its potential inability in biofilm penetration, further pre-clinical trials considering this aspect are strongly needed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Variation of Efficacy of Filtering Face Pieces Respirators over Time in a Dental Setting: A Pilot Study
Full text linkSince aerosol continuously persists in dental settings, where different procedures and patients come in succession, the use of oronasal masks is highly recommended. Among them, respirators known as Filtering Face Pieces (FFP) show a protective superiority compared to surgical masks. Even concerning respirators classified as non-reusable, it is not known how many hours of use are necessary to compromise their filtering capacity. The aim of this study is to investigate the variations of filtering capacity of an FFP2 respirator over time, in order to safely optimize the timing of its use. Five respirators were worn by the same operator during clinical activity for different usage times (8, 16, 24, 32, 40 h), and one respirator was kept unused. All respirators underwent a bacterial filtration efficacy (BFE) test. T-test for paired data with Bootstrap technique and Wilcoxon test for paired data compared BFE values of the five tested FFP2s respectively at each time, and the areas with the corresponding values of the control respirator (FFp2-F). A generalized linear mixed effect model (GLM) was applied considering type of respirator and time as fixed effects and intercept as random effect. No significant statistical differences were present in the BFE of each time. Data obtained by the present study highlight the important ability of FFP2s to maintain their BFE over time, suggesting a long lasting protective function
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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