1,721,046 research outputs found
Cranio-facial growth and relaps factors in class iii malocclusions [Crescita cranio-facciale e fattori di recidiva delle iii classi]
No full textObjectives. To analyze cranio-facial growth in Class III malocclusions and relapse factors. Methods. Information about growth in different types of malocclusions and dentoskeletal disharmonies are essential to plan orthodontic treatment, to forecast growth trends and to refer to adequate control data when evaluating treatment outcomes. Mandibular growth in Class III subjects is more pronounced, occurring with a delayed peak during adolescence and lasting longer than in subjects with normal occlusion. Results. The overall amount of mandibular growth, the negligible increase in maxillary size and the more vertical direction of growth in young adulthood are unfavorable aspects of Class III malocclusion in both sexes in the post pubertal period. Conclusions. Many authors tried to identify some unfavorable skeletal components that should induce the clinician to choose a combined surgicalorthodontic treatment. These predictive components are the increase of mandibular linear dimension and sagittal position, the worsening of skeletal vertical dimension with a clockwise mandibular rotation and increase of gonial angle
Skeletal components and classification of Class III malocclusions [Analisi delle componenti strutturali e classificazione delle III classi]
No full textObjectives. To provide a wide and updated analysis of the international literature regarding Class III malocclusions. Since their skeletal component can be very different, it is not possible to isolate a significant feature of their potential development. Methods. The Early studies suggested that the mandible was the only cause of a Class III skeletal pattern. However, factors like development of maxilla, length of cranial base and position of glenoid fossa are also involved in the skeletal pattern and therefore must be taken into consideration. Several classifications have been proposed to define many types of Class III malocclusion. Results and Conclusions. Angle's Classification considered only dental relationships without relating the teeth with facial and cranial bones. With the introduction of radiographic cephalometry all the three planes of space are taken into consideration. Other authors recognized the need to differentiate between dentoalveolar and skeletal discrepancies and to evaluate their relative contribution in the development of malocclusions. Delaire and Di Malta introduced the importance of muscular posture alterations (labio-mental, lingual, velo-pharyngeal) and of orofacial functions (nasal ventilation, swallowing, mastication) in the development of mandibular prognathism
Definition, epidemiology and etiology of Class III malocclusions [Definizione, epidemiologia ed eziologia delle III classi]
No full textObjectives. To analyze international literature regarding Class III malocclusions. Materials and Methods. The different definitions of Class III malocclusion have been analyzed. Since the 18th century this malocclusion has long been viewed as one of the most severe facial deformity. Many Authors tried to find the right definition starting from Angle who described it as an "abnormal relation of the jaws, all the lower teeth occluding mesial to normal the width of one bicuspid" to Proffit who described this malocclusion as a deviation in the sagittal relationship between upper and lower jaw. Results. The incidence of Class III malocclusion in the white population has been reported to be from 2% to 3%. In the black populations it ranges from 4% to 6%, and in Asian population t comes up to 20-30%. Conclusions. Substantial evidence supports the theory of familial influence in mandibular prognathism and Class III malocclusion; however the etiology of Class III malocclusion is multifactorial because of an interaction of both hereditary and environmental factors
Radiographic assessment of maxillary incisor position after rapid maxillary expansion in children with clinical signs of eruption disorder
No full textIn this study we assessed the influence of rapid maxillary expansion (RME) on the intraosseous vertical position and inclination of the impacted incisors diagnosed at an early developmental stage on panoramic radiographs and subsequently treated by surgical removal of the obstacle.Following surgical removal of the obstacles to incisor eruption (T1), a group of 34 subjects (mean age 8 years 11 months +/- 11 months) underwent RME, while a group of 28 subjects (mean age 9 years 1 month +/- 1 year) was monitored after surgery without further treatment. At T2 (on average 10 months after T1), the prevalence rate of subjects with erupted incisors was recorded. The measurements were taken on the panoramic radiographs at T1 and T2 to assess the vertical position and angulation of delayed unerupted incisors.At T2, impacted incisors erupted in 82.4% of the patients in the RME group versus 39.3% of those in the monitored group (chi(2) =8.45, p < 0.001). All the patients treated with RME showed an improvement in the vertical and angular position of the unerupted teeth. Logistic regression revealed RME therapy as the only significant predictive variable (p < 0.001) for successful eruption of the delayed incisors at T2.RME in early mixed dentition appears to be an effective procedure to increase the prevalence rate of impacted maxillary incisor eruption
Soft tissue evaluation of functional therapy in growing patients with Class II malocclusion: a long-term study
Full text linkObjective: The objective of this study was to analyse the soft tissue changes produced by the functional treatment of mandibular advancement in growing Class II patients. Materials: The treated group consisted of 25 Caucasian patients (12 females and 13 males) with dento-skeletal Class II malocclusion treated with functional therapy (Activator). All patients were evaluated before treatment (T1; mean age, 9.9 years), at the end of functional treatment phase (T2; mean age, 11.9 years), and at a post-pubertal follow-up observation (T3; mean age, 18.5 years). The treated group was compared with a matched control group of 25 untreated subjects (13 females, 12 males) with untreated Class II division 1 malocclusion. Statistical comparisons between the two groups were performed with independent samples t-tests (P < 0.05). Results: Significant improvements were found during the long-term interval for mandibular sulcus (9.9°) and the profile facial angle (9.8°) in the treated group. No significant effects were found in terms of lower face percentage between the two groups. Conclusion: Removable functional appliances induced positive effects on the soft tissue profile in Class II growing subjects with good stability in the long-term
Interceptive management for multiple eruption disturbances: a follow-up evaluation
Full text linkThe aim of this report was to show the management of a case with an impacted central maxillary incisor caused by odontoma in a young patient with two mesiodentes in the region of the nasal floor
Comparison of the abrasive properties of two different systems for interproximal enamel reduction: oscillating versus manual strips.
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
Thin-plate spline analysis of mandibular morphological changes induced by early class III treatment: a long-term evaluation
Full text linkTo evaluate the long-term mandibular morphological changes induced by early treatment of class III malocclusion with rapid maxillary expansion (RME) and facial mask (FM)
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