1,721,002 research outputs found
Impact of adhesive layer addition on the optical properties of remineralized white spot lesions
Full text linkBackground. The present in vitro study evaluated the camouflage effect of two treatments
for white spot lesions (WSLs): remineralization with Mi Paste Plus© (GC Europe N.V.) and
remineralization combined with a Scotchbond Multi-Purpose© (3M ESPE 2015) adhesive layer.
Additionally, the study assessed the color stability of the treatments when exposed to a staining
agent, such as coffee.
Methods. Sixty extracted anterior and posterior teeth were preserved in saline solution and
divided into two groups. Artificial WSLs were created using 37% orthophosphoric acid for 1
minute. Both groups underwent daily 6-hour remineralization treatments with Mi Paste Plus©
for 14 days. In the second group, a thin adhesive layer was applied after remineralization. Color
analysis was performed using an MHT SpectroShade Micro spectrophotometer at baseline (T1),
after remineralization (T2), after adhesive application for group 2 (TR), and after immersion in
coffee for 24 hours (T3). Color differences (ΔE) between healthy tissue and WSLs were assessed,
with ΔE ≤ 3.3 considered clinically acceptable. Data were analyzed using STATA 17 (P ≤ 0.05).
Results. ΔE analysis showed a statistically significant improvement in the camouflage effect in the
adhesive-treated group (TR) compared to remineralization alone (T2). After coffee exposure (T3),
ΔE values increased significantly in both groups, with higher values observed in the adhesive-
treated group. Intragroup analyses indicated significant differences between T2 and T3, as well
as TR and T3.
Conclusion. The application of an adhesive system can be considered a valid option to improve
the aesthetic outcome of a remineralization treatment; however, this approach carries the risk of
resin staining over time
Esthetic-functional rehabilitation: Orthodontics and restorative approach. A clinical case
No full textObjectives Aim of this paper was to bring the attention to the feasibility of using unconventional and customized dental treatment helped by composite materials for direct restorations. In this particular case a multidisciplinary dental approach was taken to restore the upper dental arch of a young female with high esthetical demand, specifically an orthodontic nontraditional procedure was carried out to avoid traditional orthodontic appliance before to restorations. Materials and methods A 25 years old patient came to our attention – at the Section of Dentistry and Maxillofacial Surgery of University of Verona – asking for the alignment of the upper central incisors and closure of the diastemas present between all the anterior teeth of the upper arch. An alginate dental impression of both arches was taken and the intraoral and extraoral photographs required for planning the clinical case were captured. Esthetical parameters and occlusal relationship were registered. All records were evaluated and a treatment plan was developed in agreement with functional and esthetical parameters, thereafter the treatment plan was submitted to patient in order to obtain her approval. With her informed written consent, the treatment began. Misalignment of upper central incisors was solved by using two palatal buttons positioned on elements 1.1 and 2.1 and applying a rotational force by means of metallic ligatures activated weekly for three months. After orthodontics, a diagnostic wax-up was made to better understand proportion and reshaping of restorations. A digital previsualization of final result was therefore performed using Keynote software (iWork, Apple, Cupertino, California, USA) in order to face the esthetical requirements of our young patient. Moreover a silicon index was built, based on diagnostic wax-up, to help the direct restoration phase performed using Ceram.x composite resin (Ceram.x duo, Dentsply Sirona, Konstanz, Germany), as a result all the diastemas were closed and reshaping of elements from first left premolar to first right premolar was performed. Results and conclusions The patient was immediately pleased with the final result both from esthetic and functional point of view. She reported to be satisfied that it was possible to avoid the traditional orthodontic treatment and the removal of natural dental tissue. With this in mind it could be advisable to remind that new composite resins, thanks to their high esthetical performances, allow to respect biological tissues and to perform mimetic changes of smile. With this perspective, a clinician could manage each case with a wider approach including different disciplines in order to guarantee the best results to his patients, also in challenging situations. In this particular case it was possible to restore the upper arch in a young girl avoiding all invasive and nonreversible procedures. Clinical significance This clinical case aimed to bring to the attention the possibility to achieve high-standards oral rehabilitations in patients with high esthetical and functional requirements. This could be possible avoiding invasive procedures, dental tissue removal and prosthetic definitive rehabilitations. Moreover, this case could be of interest because highlights the feasibility to use orthodontics in a nonconventional and individualized way, especially when the patient does not cooperate and does not accept the traditional treatment. Furthermore, the economic cost of a short-term orthodontic procedure and of direct composite resin restorations make more appealing the treatment proposed
Response to a Comment on “Malignant transformation evidences of Oral Lichen Planus: When the time is of the essence”
Full text linkDear Editor, We want to thank Desai et al. [1] for the comment and discussion on our article “Malignant transformation evidences of Oral Lichen Planus: When the time is of the essence” [2]. Firstly, we are pleased to inform you that our extended work about Oral Lichen Planus (OLP) and malignant transformation was recently published, which allows us to better understand unclear issues [3]. However, regarding the letter by Desai RS et al., some clarifications deserve to be provided. We are in agreement with Guan et al. [4] who highlighted that OLP malignant transformation occurred also in not smokers patients. Our findings, indeed, showed a significant malignant transformation rate associated with localization of OLP lesions (especially on tongue margins, OR = 3.55 and P = 0.04) and with features of them (particularly erosive and ulcerative lesions, OR = 2.48 and P = 0.1). Regarding habits, smoking was found to be significantly associated with cancer transformation with an Odds Ratio (OR) of 3.29 (IC 0.58–18.37) and P = 0.18; on the other side, it was difficult to estimate the role of alcoholic consumption, due to uncertain answers of patients interviewed. Nevertheless, in our opinion, the important focus to evaluate is the observation period of patients when OLP is diagnosed and lesions. Our work showed the great importance of extending follow-up to early diagnose malignant transformation; indeed some of them occurred later than 4 years of observation, meaning that the cancer transformation rate of OLP lesions is a significant risk during the life as Guan et al. suggested in their research. Considering our results, we can conclude that clinical features of OLP lesions must be carefully evaluated for the correct timing of the follow-up, which must be as long as possible for them. We sincerely thank Desai RS et al. for the discussion about our work
A Snapshot of Knowledge about Oral Cancer in Italy: A 505 Person Survey
Full text linkObjectives: Patients' knowledge about oral squamous cell carcinoma (OSCC) plays an important role in primary prevention, early diagnosis, and prognosis and survival rate. The aim of this study was to assess OSCC awareness attitudes among general population in order to provide information for educational interventions. Methods: A survey delivered as a web-based questionnaire was submitted to 505 subjects (aged from 18 to 76 years) in Italy, and the answers collected were statistically analyzed. Information was collected about existence, incidence, features of lesions, risk factors of oral cancer, and self-inspection habits, together with details about professional reference figures and preventive behaviors. Results: Chi-square tests of independence with adjusted standardized residuals highlighted correlations between population features (age, gender, educational attainment, provenance, medical relationship, or previous diagnoses of oral cancer in family) and knowledge about oral cancer. Conclusions: Knowledge about OSCC among the Italian population is limited, and it might be advisable to implement nudging and sensitive customized campaigns in order to promote awareness and therefore improve the prognosis of this disease
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
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