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La barra trans palatale secondo la tecnica di Norman Cetlin
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Mechanobiology of the tooth movement during the orthodontic treatment: A literature review
No full textOrthodontic tooth movement differs significantly from the physiological tooth movement, as it determines a biological response of the surrounding tissues of the teeth, resulting in a remodelling of the periodontal ligament and the alveolar bone. The result is a biochemical adaptive response to the application of the orthodontic force with the reorganization of the intracellular and the extracellular matrix, in addition to a change of the local vascularization. This in turn leads to the synthesis and the release of arachidonic acid, growth factors, metabolites, cytokines and various enzymes. Biologically, not only the intensity of the force, but also its duration and the tissue response to the application of the same are important for tooth movement. Having these insights it will possible to examine the concept of optimal orthodontic force, a determining factor for the success of orthodontic treatment. The purpose of this revision was to describe the biological processes and future perspective of the application of orthodontic force, by providing relevant information to understand the changes at the molecular and cellular level occurring when the tissues are subjected to such forces. Knowledge on the subject of mechanics and biology in orthodontics is constantly growing, producing an increasingly strong basis for clinical success.Orthodontic tooth movement differs significantly from the physiological tooth movement, as it determines a biological response of the surrounding tissues of the teeth, resulting in a remodelling of the periodontal ligament and the alveolar bone. The result is a biochemical adaptive response to the application of the orthodontic force with the reorganization of the intracellular and the extracellular matrix, in addition to a change of the local vascularization. This in turn leads to the synthesis and the release of arachidonic acid, growth factors, metabolites, cytokines and various enzymes. Biologically, not only the intensity of the force, but also its duration and the tissue response to the application of the same are important for tooth movement. Having these insights it will possible to examine the concept of optimal orthodontic force, a determining factor for the success of orthodontic treatment. The purpose of this revision was to describe the biological processes and future perspective of the application of orthodontic force, by providing relevant information to understand the changes at the molecular and cellular level occurring when the tissues are subjected to such forces. Knowledge on the subject of mechanics and biology in orthodontics is constantly growing, producing an increasingly strong basis for clinical success
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
Combined orthodontic-surgical management of a transmigrated mandibular canine
No full textThe presence of an impacted mandibular canine is one of the most difficult challenges that an orthodontist will meet. Orthodontic treatment is planned on an individual basis after thoroughly considering the patient's overall facial and dentoskeletal characteristics; the duration, risks, and costs of treatment; patient preferences; and the orthodontist's experience. This article reports an orthodontic treatment of a boy, age 12.9 years, with an impacted mandibular canine in the permanent dentition that was successfully managed. Radiographic analysis indicated a transmigration of the mandibular right canine. The orthodontic treatment plan included extraction of the deciduous right canine followed by surgical exposure and ligation of the permanent canine. Eruption was properly guided, and the correct position of the tooth was achieved. This challenging treatment approach is described in detail, including the mechanics used to align the impacted canine.The presence of an impacted mandibular canine is one of the most difficult challenges that an orthodontist will meet. Orthodontic treatment is planned on an individual basis after thoroughly considering the patient's overall facial and dentoskeletal characteristics; the duration, risks, and costs of treatment; patient preferences; and the orthodontist's experience. This article reports an orthodontic treatment of a boy, age 12.9 years, with an impacted mandibular canine in the permanent dentition that was successfully managed. Radiographic analysis indicated a transmigration of the mandibular right canine. The orthodontic treatment plan included extraction of the deciduous right canine followed by surgical exposure and ligation of the permanent canine. Eruption was properly guided, and the correct position of the tooth was achieved. This challenging treatment approach is described in detail, including the mechanics used to align the impacted canine
Étude de la temporomandibulaire chez les patients atteints de sclérodermie : étude d'une cohorte du sud de l'Italie
No full textPeriodontal biotype: characteristic, prevalence and dimensions related to dental malocclusion. [Il biotipo parodontale: Caratteristiche, prevalenze e dimensioni correlati alla malocclusione dentale]
No full textBACKGROUND: Knowledge of periodontal anatomy is essential when performing surgical and non-surgical procedures in the field of oral healthcare. Gingival biotype is often assessed for this purpose. The aim of this study was to assess the prevalence of the gingival biotypes in a group of patients and to evaluate if the gingival biotypes were related with the different types of Angle's classification of malocclusion.
METHODS: The study was performed on 76 volunteer patients (38 males, 38 females, mean age 14.7 years old). Gingival biotypes were assessed with the evaluation on the translucence of a periodontal probe through the gingival margin of the tooth during the probing, at the mid facial aspect of both maxillary central, lateral incisors and canine; on each patient, Angle's classification of malocclusion was also recorded.
RESULTS: The prevalence in the whole sample of thin gingival biotype was 43.4% and thick gingival biotype was 56.6%. The frequency of female with thin gingival biotype was significantly less respect to male patients (42.4% and 55.6%, respectively) while the thick gingival biotype was higher in the female respect to male patients (55.8% and 44.2%, respectively) (χ2=1.339, P=0.247). There was not a significant association between type of malocclusion and gingival biotype (P=0.143). There was however a prevalence of thick gingival biotype in patient with class II malocclusion and a slight prevalence of thin gingival biotype in patient with class I malocclusion.
CONCLUSIONS: No relationship was found between gingival biotypes and Angle's classification of malocclusion. In this sample, a higher prevalence of thick gingival biotype especially among female subjects was observed
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
Occlusal and MRI characterizations in systemic sclerosis patients: A prospective study from Southern Italian cohort
No full textObjectives: The aim of the present study was to assess the prevalence of temporomandibular joint (TMJ)symptoms, clinical and magnetic resonance imaging (MRI) findings in a cohort of Southern Italian patientswith SSc.Methods: Twenty-seven patients with SSc (12 diffuse, 15 limited, mean age 53.9, SD ± 1.2) and 28 healthysubjects (mean age 54.8, SD ± 4.2) were enrolled in this observational cohort study. In all patients, clinicalexamination for assessing the presence of TMJ sounds, pain in the TMJ area, tenderness of masticatorymuscles, limited mouth opening, pain assessment, MRI scan and Anamnestic and Dysfunctional Indexwere performed.Results: The test groups reported more clinical and MRI findings of TMJ symptoms and dysfunction thancontrol group. The frequency distributions of symptoms were significantly different (P < 0.05), in thetest groups for TMJ sounds, pain during mandibular movement and difficulty in the maximum mouthopening. There was also a significant decrease (P < 0.001), in the test groups, in the mean of leftward,rightward laterotrusion and protrusion. Correlation analysis allowed to affirm that maximum openingleftward laterotrusion, protrusion and click were significantly correlated to Modified Rodnan Skin Score.The mean duration of disease was significantly correlated, ever in total SSc group, only for the maximummouth opening value.Conclusion: This study demonstrates that TMJ involvement is common in SSc patients and is correlatedwith a length and involvement of disease and supports the notion that TMJ examination should be encour-aged in the rheumatology setting and clinicians should provide a right pain management and patientsupport.Objectives: The aim of the present study was to assess the prevalence of temporomandibular joint (TMJ)symptoms, clinical and magnetic resonance imaging (MRI) findings in a cohort of Southern Italian patientswith SSc.Methods: Twenty-seven patients with SSc (12 diffuse, 15 limited, mean age 53.9, SD ± 1.2) and 28 healthysubjects (mean age 54.8, SD ± 4.2) were enrolled in this observational cohort study. In all patients, clinicalexamination for assessing the presence of TMJ sounds, pain in the TMJ area, tenderness of masticatorymuscles, limited mouth opening, pain assessment, MRI scan and Anamnestic and Dysfunctional Indexwere performed.Results: The test groups reported more clinical and MRI findings of TMJ symptoms and dysfunction thancontrol group. The frequency distributions of symptoms were significantly different (P < 0.05), in thetest groups for TMJ sounds, pain during mandibular movement and difficulty in the maximum mouthopening. There was also a significant decrease (P < 0.001), in the test groups, in the mean of leftward,rightward laterotrusion and protrusion. Correlation analysis allowed to affirm that maximum openingleftward laterotrusion, protrusion and click were significantly correlated to Modified Rodnan Skin Score.The mean duration of disease was significantly correlated, ever in total SSc group, only for the maximummouth opening value.Conclusion: This study demonstrates that TMJ involvement is common in SSc patients and is correlatedwith a length and involvement of disease and supports the notion that TMJ examination should be encour-aged in the rheumatology setting and clinicians should provide a right pain management and patientsupport
TOOTH TRANSPOSITION BETWEEN UPPER MOLAR AND PREMOLAR: A CASE REPORT
No full textAim. Tooth transposition is defined as a type of ectopic eruption with a permanent tooth developing and erupting in the position normally occupied by another permanent tooth. Although transpositions can appear in both the maxilla and the mandible, the maxillary canine is the most frequently involved tooth, followed by the first premolar, and less often by the lateral incisor. The aim of this work was to show an unusual tooth transposition between a molar and a premolar.
Materials and methods. A 10-year-old girl showed a Class I dental relationship in early mixed dentition: the maxillary arch was slightly constricted with no crossbite. Mild crowding in both arches and a tendency to open bite with tongue thrust were observed. The facial profile was slightly convex. The panoramic radiograph showed a developing ectopic premolar. The treatment had two phases. The first phase, lasting 1 year, was interceptive with a transpalatal bar in the maxillary arch and a lip bumper in the mandibular arch. The second phase of the treatment began with the placement of 0.022 x 0.028 standard edgewise appliances associated with high-pull headgear to supplement the anchorage and achieve vertical control. Initial leveling was accomplished with 0.016 and 0.018 Australian round wires and an open-coil springs to gain the space for the unerupted bicuspid. Then, the left second premolar was surgically exposed from the palatal side and showed an enamel hypoplasia of the crown. During the surgery a button for orthodontic traction was bonded and an elastomeric chain was applied. The tooth erupted palatally close to the distal cusp of the first molar. Once the premolar tooth was in the buccal position, rectangular archwires were used to move the roots progressively buccally and to complete the leveling of the arch. The fixed phase lasted 18 months. After active orthodontic treatment, maxillary and mandibular Hawley retainers were used for retention.
Results. The panoramic radiograph during treatment showed that the crown and the root of the maxillary left second premolar were into the correct position. The final occlusion was good, although the ectopic maxillary left second premolars had an ovoid shape and required reshaping with composite materials. However, the gingival height at the buccal side of the left premolar was satisfactory. Facial esthetics was preserved. The total treatment time was 3 years 6 months. Bilateral Class I molar and canine relationships and ideal overjet and overbite were achieved.
Conclusions. The tooth transposition is among the most difficult challenges for orthodontists. As shown by the occlusal and esthetic outcome of this clinical case, early diagnosis and treatment are suggested, albeit the complexity and the length of the treatment protocol. Moreover, a cost-benefit evaluation is always to be considered. Light forces and extra care, however, are required to prevent any possible damage to the teeth and the supporting structures. Therefore, early treatment of an unusual tooth transposition, even if carefully, should be considered
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