1,721,075 research outputs found
Condylar morphology in growing patients related to vertical dimension
No full textAim of the study was to evaluate the mandibular morphology, especially the condylar one, in growing patients, according to the different vertical patterns. The objective was to analyze which condylar dimensions significantly vary in low, normal and high angle divergency growing patients with the use of the orthopantomogram (OPG).From a database of randomly selected 514 patients, 96 subjects (48 males and 48 females) with skeletal Class I according to lateral cephalograms were selected and divided in three equal groups in relation to their vertical dimension (32 low FMA angle, 32 normal FMA angle and 32 high FMA angle). Each patient was examined with three OPGs at three different stages of dentition. OPGs were taken at the time of initial observation (T0 = first transitional phase of mixed dentition), after an average time of 12±1 months (T1=inter-transitional phase of mixed dentition) and after 36±3 months (T2=second transitional phase of mixed dentition). The radiological technician and the radiologic device were the same for each x-ray. On each OPG, condylar and mandibular ramus morphology of both sides was traced. Eleven linear and angular measurements were reported on each tracing. Data were analyzed by Wilcoxon's signed rank test and the Student's t-test.The study showed different condylar characteristics according to the vertical patterns. Differences were evident between males and females.The length of the mandibular ramus resulted longer in short-face patients respect to long-face subjects
L’articolazione temporo-mandibolare in dentatura decidua e mista : revisione della letteratura
No full textObjectives. Aim of this work is to provide a detailed description of the development of the temporomandibular joint (TMJ) in primary and mixed dentition. Methods. The most important joint structures (condyle, glenoid fossa, articular eminence, articular disk and articular capsule) are analyzed separately in relation to histomorphology at birth and during the following stages of maturation and development. Results. During growth the glenoid fossa acquires its characteristic S shape and a tubercle develops. The articular eminence height grows at a very high rate until the age of seven (the period of primary dentition), almost stops until the age of eleven (the period of mixed dentition) and reaches its full height by the age of 20. Conclusions. The knowledge of TMJ evolution during craniofacial growth could help to establish more biological treatment modalities
A pilot study about emotional experiences by using CFSS-DS in young patients
No full textAim The aim of this work is to study fears and anxieties of school age Italian children regarding dental experience. In particular, to assess the prevalence of this phenomenon and understand its possible correlation with five different variables: sex, aged social context, previous dental experiences, and self-consciousness of fear Materials and methods 725 Italian children were divided according to five variables, and their anxiety studied through the self-filling of the Children's Fear Survey Schedule-Dental Subscale (CFSS-DS). Statistical analysis: The obtained results are descriptive and the), are expressed as percentage values. For the stud), of the five variables considered, we have carried out a statistical regression analysis, by using the S-PLUS 6.0 Professional software. Results 26% of the total sample are anxious about the dental experience (total score CFSS-DS>39). The objects of greater anxiety are: fear of being admitted to hospital, injections, and the use of drilling instruments. Every variable considered in the selection.of the sample was significant (p <0.05) in explaining and influencing the phenomenon "anxiety". In particular, the subjects aged 8, attending the third class of primal-V school were more anxious (they were also the most conscious of their emotional difficulties), and so little girls and subjects living in areas of low level of urbanisation and those who had never lived previous dental experiences. Conclusion The percentage of children who may exhibit more or less serious behaviours to dental treatments, including the borderline subjects, is above 50%. So it is easy to realise how this problem still exists in clinical dental reality, and it is fundamental for the dentist to understand and identify these frequent difficulties
pH of tooth surface in healthy adolescents at rest and after a glucose rinse : effect of 72 hours of plaque accumulation
No full textThis study was performed to evaluate the effect of a glucose rinse and of plaque accumulation on pH of tooth surface in healthy adolescents with a device used in gastroenterology and never tested in the oral cavity. MATERIALS AND METHODS: Values of pH were monitored in 12 adolescents using a portable device (pH-day 2® Menfis, bioMedica S.r.l., Bologna, Italy) with a disposable antimonium electrode kept in contact with the interproximal surface of the upper molars for 40 minutes respectively before and after a one-minute rinse with 10 ml of a 10% glucose solution. The same procedure was repeated in the same subjects after 72 hours of plaque accumulation.The device tested resulted difficult to use on the tooth surface because of the size of the active part of the probe. The glucose rinse caused a statistically significant decrease of the mean pH, restrained in basal conditions (d = -0.16, p <0.05), clinically relevant after plaque accumulation (d = -1.24, p <0.05). Time in minutes of pH < 6 grew considerably only in case of combination of plaque accumulation and glucose rinse (d = 20.90, p <0.05). A Stephan's curve of drop and recover of the pH values was not recorded.The continuous recording of pH of natural plaque present on the tooth could represent an alternative to other techniques found in literature. More studies are necessary to verify the suitability of this new device for the monitoring of pH in the oral cavity
Spontaneous correction of anterior crossbite by RPE anchored on deciduous teeth in the early mixed dentition
No full textThe purpose of this study was to evaluate the effectiveness of Haas RPE anchored on deciduous teeth in the early mixed dentition, for inducing the spontaneous correction of permanent incisor's crossbite, without compliance, without post bite-plane and no involvement of the permanent teeth.The sample group comprised 50 consecutive patients (mean age 8y 5m, SD 2y 1m), 31 males, 19 females. They showed a cross-bite affecting one or more permanent incisors, for a total of 70 teeth. The patients were treated with Haas RPE appliance anchored on second deciduous molars and bonded on deciduous canines. No direct forces were applied on the permanent teeth.Anterior crossbite self-corrected 'spontaneously' in 84% of the cases. Lateral incisors had a higher rate of self-correction than central incisors. All hyper-divergent subjects showed a spontaneous crossbite self-correction.The early maxillary expansion by Haas RPE anchored on deciduous teeth is an efficient and effective procedure to induce the anterior crossbite self-correction in the early mixed dentition without the need of a bite-plane, no involvement of the permanent teeth and without compliance
Indagine conoscitiva sulle attività e competenze del coordinatore delle attività teorico pratiche nel Corso di Laurea in Igiene Dentale
No full textGoing 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
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