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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
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
Interdisciplinary treatment of Class III malocclusion: a case report.
No full textThe case report describes the multidisciplinary treatment of a 25-year-old male patient with a Class III malocclusion. Anterior and bilateral posterior crossbites were present. To correct the posterior crossbite a surgically assisted rapid maxillary expansion was performed. The significant three dimensional skeletal discrepancy was solved in a second phase with a surgical advancement of the maxilla. Functional and aesthetic occlusion in an improved facial profile was achieved with an interdisciplinary treatment that included orthodontic treatment, maxillofacial and periodontal surgery, and direct composite restorations
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
Use of a flexible palatally positioned distalization appliance [Distalizzazione elastica graduabile]
No full textObjectives: To describe the case of a 10-year-old boy with complete permanent dentition, Class II division I malocclusion and deep anterior bite. Materials and methods: The initial cephalometric tracing revealed a Class II hypodivergent pattern with reduction of the anterior facial height. The patient was treated with a flexible, palatally positioned orthodontic appliance for 7 months, after which a multibracket appliance (upper and lower arches) was used for approximately 18 months. Results and conclusions: The flexible distalizing device achieved distalization of upper molars, and the multibracket appliance allowed correction of the relationship between the two arches, producing a Class I occlusion of canines and molars and the correction of the overbite and overjet. © 2011 Elsevier Srl. All rights reserved
Tissue response during self-ligating treatment.
No full textOrthodontic tooth movement is characterized by tissue reactions, which consist in an inflammatory response in periodontal ligament, depending on the forces applied. Self-ligating brackets are able to minimize the sliding resistance and to reduce the forces necessary to move a tooth, with a better tissue response.The purpose of this study was to evaluate the activity of the lactate dehydrogenase (LDH) in gingival crevicular fluid (GCF) during orthodontic tooth movement using self-ligating brackets.Forty patients were selected and treated with two kinds of self-ligating brackets, Quick 2.0 and Smart Clip, and superelastic or thermoactive archwires. Patients' lower arches were bonded and GCF was collected at one side for each tooth at baseline, one hour after bonding and on the 7(th), 28(th) and 42(nd) day. Test teeth were 4.1, 4.3 and 4.5. Control teeth were 1.1, 1.3 and 1.5. Samples were analyzed with a specific assay for LDH activity.The statistical analysis showed no significant differences in the LDH activity between test and control teeth in the selected groups.There are no significant differences, in terms of tissue response, between superelastic and thermoactive archwires
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