1,720,967 research outputs found
BIOMECHANICAL CONSIDERATIONS ON MACROMORPHOLOGY OF ENDOSSEOUS DENTAL IMPLANTS
No full textThe aim of the present study is to define the optimal thread form and why the macroscopic shape of the dental intra-osseous implant interacts with the biological environment thus conditioning its lifespan and long-term success
Infraposition of Implant-Retained Maxillary Incisor Crown Placed in an Adult Patient: Case Report
No full textSeveral studies have clearly shown that osseointegrated implants, when inserted in growing bone, such as in adolescents, do not follow the eruptive path of adjacent teeth; instead, they act like ankylosed teeth, remaining in a stationary position for the lifetime, thus developing a progressive infraposition of the implant-supported crown. However, further studies have demonstrated that similar changes also occur in adult patients, although mostly in a small amount and over long time spans. Here the case of a female patient aged 35 years is presented, in which infraposition of the maxillary central incisor developed in a very short time (15 months). The treatment provided was a combined orthodontic/prosthetic approach with a 4-year follow-up
Continuous craniofacial growth in adult patients treated with dental implants in the anterior maxilla
No full textBACKGROUND:
In the Literature, there are several studies demonstrating that infraposition happens also in adult patients.
PURPOSE:
To conduct a retrospective evaluation of infraocclusion of implant-retained crowns in the anterior maxilla of adult patients and of the patient awareness and perception of the problem.
MATERIAL AND METHODS:
From January to June 2017, all adult patients who in the last 5 to 20 years had received in the same clinic implant restorations in the upper anterior maxilla were recalled to assess the presence of crown infraocclusion. Ninety-four patients were recalled. Twenty-six males, 34 females, with 76 implants were included in the study. According to the age, patients were divided into group I (30 years: 14 males, 20 females). Digital photographs, taken at the time of final prosthesis delivery (T0) and at time of the study examination (T1) were compared by three blinded previously calibrated examiners. Cast models of the dental arches were taken at T1 and served as a reference for infraocclusion measurements. According to the Literature, cases were included in three categories: infraocclusion 1 mm. An awareness and perception score (APS) was prepared to classify patients in: "unaware patients" (0), "aware but disinterested patients" (1), "aware patients requiring explications" (2), and "aware patients requiring treatment" (3).
RESULTS:
Infraocclusion was present in 73.3% of all cases, 65.4% among males, 79.4% among females. Infraocclusion was less than 1 mm in 88.2% of males and in 85.1% of females. No significant differences were found for sex (P = .223). No significant differences were found for age: group I: 47.7%, group II: 52.2%, (P = .481). The overall APS was: "unaware patients" = 38.6%, "aware but disinterested patients" = 27.3%, "aware patients requiring explications" = 15.9%, "aware patients requiring treatment" = 18.2%
Static and fatigue resistance of two types of implant/abutment connectors
No full textThe aim of this study is to determine in an experimental way through mechanical tests the static, fatigue and torque resistance of two types of implant/abutment connectors with diameters of 3.45.2 mm
A combined investigation of bone microstructure around nanotite mini-implants placed in humans
No full text
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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