177,738 research outputs found
Upper arch dimensional changes with clear aligners in the early mixed dentition: A prospective study
No full textBackground One goal of orthodontic treatment in mixed dentition is to expand the maxillary arch to allow proper tooth alignment and a correction of sagittal and vertical malocclusions. However, for most treatment protocols, expected outcome is not really clear to allow for a standardization of phase I orthodontic treatments. This lack of information makes it difficult for clinicians to predict tooth movements, including transverse expansion efficacy with Invisalign (R) (Align Technology, Santa Clara, CA, USA) in children. Therefore, the aim of the present study was to evaluate the transverse maxillary arch development with the Invisalign First System (R) in growing subjects.Methods The study group included 23 subjects (9 females, 14 males, mean age 9.4 +/- 1.2 years). Patients were treated nonextraction with Invisalign First System (R) clear aligners with no auxiliaries other than Invisalign (R) attachments. Transverse interdental widths were measured only in the upper arch on each model at the start (T1) and at the end (T2) of treatment. A paired t-test was chosen to compare T2-T1 changes. The level of significance was set at 5%.Results The greatest increase of maxillary width was detected at the level of the upper first deciduous molars (+3.7 +/- 1.4 mm; P < 0.001), followed by the level of the second deciduous molars (+3.4 +/- 1.6 mm; P < 0.001) and by the deciduous canine (+2.6 +/- 2.0 mm; P < 0.001). Upper first molars showed a greater expansion in the intermolar mesial width (+3.2 +/- 1.2 mm; P < 0.001) than in the intermolar distal (+1.7 +/- 1.2 mm; P < 0.001) and transpalatal width (+1.2 +/- 1.2 mm; P < 0.01).Conclusions The Invisalign First System (R) can be considered effective in growing patients who require maxillary arch development. The greatest net increase was detected at the level of upper first deciduous molars, whereas the upper first molars showed a greater expansion in the intermolar mesial width due to a rotation that occurs around its palatal root
Clear aligners in pediatric age in a case of gingival recession due to malocclusion | [Allineatori in età pediatrica in un caso di recessione gengivale dovuta a malocclusione]
No full textAppropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Synchrotron radiation in radiology: radiology techniques based on synchrotron sources
No full textThe characteristics of synchrotron X-ray sources-quite different from those of conventional sources-are exploited by several new imaging techniques. These techniques expand the capabilities of conventional radiology and find interesting application in special cases. We briefly review the basic principle, applications and limitations of the most important of them: monochromatic mammography, two-wavelength digital subtraction angiography, phase-contrast/edge-enhancement imaging, diffraction-enhanced imaging and microtomography.LSELPRXCHU Vaudois, Serv Radiodiagnost & Radiol Intervent, CH-1011 Lausanne, Switzerland. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. Pohang Univ Sci & Technol, Dept Mat Sci, Pohang, South Korea. Ecole Polytech Fed Lausanne, Fac Sci Base, CH-1015 Lausanne, Switzerland. Meuli, R, CHU Vaudois, Serv Radiodiagnost & Radiol Intervent, CH-1011 Lausanne, Switzerland. [email protected] Document Delivery No.: 859O
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Clear aligners effects on aesthetics: evaluation of facial wrinkles
No full textBackground: To evaluate the facial aesthetic effects of orthodontic treatment performed with clear aligners and
to compare it to an untreated control group, on lower third facial ageing in adult patients through the use of the
Wrinkle Severity Rating Scale (WSRS) at the beginning (T0) and at the end (T1) of the study period.
Material and Methods: A clear aligners treated group (TG) of 68 patients was compared to a control group of 33
untreated patients (UG). Each group was divided in 2 subgroups according to age: subgroup 1 if under 40 years
of age and subgroup 2 if over. Facial aesthetics of the lower third was evaluated at T0 and T1 by a panel of five
aesthetic experts with WSRS.
Results: Statistically significant changes were found in all subgroups comparing WSRS scores at T0 and T1. The
between group comparisons revealed that wearing clear aligners produces a statistically relevant improvement in
lower third facial aesthetics both in younger (p < 0.05) and older (p < 0.001) patients.
Conclusions: The present retrospective cohort study has successfully shown that malocclusion therapy conducted
through the use of clear aligners in a population of adults affected by dental crowding has beneficial effects on
lower third facial ageing
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