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At least 1,117 records · Page 62Linked to original sources
PubMed1998

Costochondral grafts to replace mandibular condyles in juvenile chronic arthritis patients: long-term effects on facial growth.

Long-term facial growth and clinical outcome after replacement of arthritic mandibular condyles by costochondral grafts and postoperative orthodontic guidance of the occlusion were studied until completion of facial growth in patients (n = 12) with juvenile chronic arthritis (JCA) affecting their temporo-mandibular joints (TMJs). The patients were between 10.1 and 16.7 years of age at surgery. Clinical records and radiographs for cephalometric measurements were taken preoperatively, 6-8 weeks after surgery and after completion of facial growth. A considerable potential for growth of the costochondral graft/mandible unit was demonstrated in all patients. The results also indicated a considerable risk of asymmetrical mandibular overgrowth (n = 8), which could not be correctly assessed until after skeletal maturation was complete. Without any active orthodontic treatment, compensatory growth of the alveolar processes closed the lateral open bites, which were created during surgery. The functional results of the reconstructed temporo-mandibular joints were good and the morbidity rate was low. Costochondral grafting is a versatile treatment when the TMJs are severely affected by JCA, but requires supervision of patients until skeletal maturation, to monitor possible mandibular overgrowth. Advantages of this method were re-established mandibular growth, good mandibular function, a low morbidity rate and early aesthetic improvement.

Adolescent↗
PubMedDate not supplied

Prevalence and factors related to mouth breathing in school children at the Santo Amaro project-Recife, 2005.

AIM: To determine the prevalence of mouth breathing children at the santo amaro project/ esef/ upe, and study their main facial and behavior alterations. STUDY DESIGN: transversal study. MATERIAL AND METHODS: there were 150 children in the sample, with ages ranging from 8 to 10 years. Data was collected by means of a questionnaire and clinical examinations. As for their breathing assessment, two tests were carried out: test 1- breath steam against a mirror; and test 2 -water remains in the mouth with lips closed for 3 minutes. RESULTS: mouth breathing prevalence was of 53.3%. There was no significant difference between gender, age and type of breathing. Facial alterations were:incomplete lip closure ( 58.8%X5,7%), fallen eyes ( 40.0%X1.4%), High palate ( 38.8%X2.9%), Anterior open bite ( 60.0% Versus 30.0%), Hypotonic lips ( 3.8%X0.0%), Circles under the eyes (97.5% Versus 77.1%). CONCLUSION: high mouth breathing prevalence without significant statistical difference between genders,age and type of mouth breathing. There was no association between behavior characteristics and type of breathing. There were significant differences between physical traits and breathing pattern.

Brazil↗
PubMed2000

Distraction osteogenesis for mandibular advancement.

The purpose of this study was to investigate the possibilities of distraction osteogenesis to correct mandibular hypoplasia. Fourteen young patients (mean age 14.1 years) with a proven resistance to initial, functional orthodontic therapy, were treated by means of bilateral intraoral distractors. The corticotomy was performed in the region of the third molar. The latency time was six days and the stabilization period six weeks. In all cases the planned lengthening of the mandible and class 1 occlusion were achieved. Seven patients required additional elastic band traction to close a mild open-bite directly after active distraction. In the first seven patients, insufficient mobilization at the site of the corticotomy had resulted in a broken distraction rod in two patients and incomplete distraction of the lingual cortex in one patient. Adequate mobilization at the site of the corticotomy prevented these problems in later cases. No permanent sensory disturbances were seen. Twelve patients finished their orthodontic treatment within six months after distraction.

Adolescent↗
PubMed2003

Unusual oral findings in dermatosparaxis (Ehlers-Danlos syndrome type VIIC).

A 13-year-old patient with dermatosparaxis (Ehlers-Danlos syndrome type VIIC), an autosomal recessive disorder of procollagen-I-N-proteinase, is presented. The oral findings comprise micrognathia, hypodontia, localized microdontia, opalescent tooth discoloration, root dysplasia, pulp obliteration, severe gingival hyperplasia, frontal open bite, and severe restriction of TMJ mobility. The reported anomalies suggest the need for expanding the present phenotypic spectrum. This is the first report on oral findings in the syndrome.

Adolescent↗
PubMed2003

Consistency of diet and its effects on mandibular morphogenesis in the young rat.

The purpose of this study was to evaluate the relationship between mandibular morphogenesis and masticatory function in 30 male Sprague-Dawley rats, 28 days of age. Animals were randomly divided into three groups and they received diets of different consistency: liquid, normal (as control group) and elastic diet. The experiment lasted 28 days, at the end of which lateral radiographs of the cranium and photographs of the hemimandibles were made. These images were magnified fourfold and analysed in two dimensions (V = vertical dimension; S = sagittal dimension). Condylar morphology was also assessed. The photographic analysis of the hemimandible showed a significantly higher growth of the mandibular ramus stimulated by the elastic diet: V2 2.4 mm, V3 2.4 mm, V4 1.9 mm, V5 4.1 mm (p < 0.05). In contrast, a statistically significant (p < 0.05) lengthening of the mandibular corpus occurred in the rats subjected to liquid diet (S1 4.5 mm, S2 2.7 mm, S3 1.6 mm, S4 2.6 mm). Measurements were taken on both the radiographic and the photographic records. The variation coefficient showed that photographic analysis was more accurate than the radiographic analysis. From these data it appears that an increase in the tonus of the protrusive muscles could be beneficial in mandibular hypoplasia and the increased tonus of the masticatory muscles in skeletal open bite.

Animals↗
PubMed1976

Surgical orthodontics: maxillary procedures.

The greatly increased use of maxillary surgery in the last five years has widened the possibilities for correction of dentofacial deformities. The best result in occlusion and esthetics in each situation is the goal that the orthodontist and oral surgeon must keep in mind: working together. While unfortunate side effects can occur, the experience of teams using well-managed orthognathic surgical methods shows a very good success record. The indications and treatment procedures for anterior, posterior and total maxillary osteotomies were discussed. Some of the conditions which can be well-treated are maxillary protrusion and retrusion, anterior deep and open bites, lip imbalance due to dental protrusion or excess vertical dimension, and maxillary asymmetries. The limitations of orthodontic practice without the inclusion of appropriate surgical procedures exclude real help for many of the people who need it most. We must be realistic in evaluating our achievements so that constant improvement is possible.

Adolescent↗
PubMed1979

The mandibular plane angle in activator treatment.

The long-term results of activator treatment were investigated in 15 subjects with a small and 13 subject with a large pretreatment mandibular plane angle. The results of the investigation revealed the following: 1. Activator treatment resulted in a general improvement in the sagittal and vertical incisor relationship in both large and small angle cases. 2. Overjet relapse was more frequent and overbite relapse less frequent in large angle cases than in small angle cases. 3. During the period before treatment follow-up examination the frequency of patients with open bite increased in the large angle group and decreased in the small angle group. 4. The mandibular intercanine arch width was smaller and the frequency of crowding in the mandibular incisor segment was higher in the large angle group than in the small angle group. 5. A large pretreatment mandibular plane angle, per se, was not a primary factor in treatment failure. However, an unfavourable mandibular growth in combination with an atypical tongue function seemed to be the main reason for the relapse found in the large angle subjects.

Activator Appliances↗
PubMed1979

Resting tongue pressures.

A specially-designed force transducer was used to measure lateral resting-tongue pressure in 23 subjects. Seventeen subjects had normal occlusion and six had dental open-bite conditions. Three sensing tips with different contact areas were used to study the relationship between sensor area and measured force. The average force of the resting tongue was 0.8 g when measured with a 4.9 mm diameter sensor (pressure = 0.039 g/mm2). When the size of the sensor tip was increased, the force of the tongue increased in a nonlinear manner. Controlled incremental lingual constrictions of 6 mm resulted in an average increase in lingual force of 230 percent. The mean rate of change, measured in deflection gradient, was 0.34 g/mm. The mean stiffness of the lingual musculature was 2.30 g/mm. A correlation of r = --0.4 was found between resting-tongue pressure and mandibular intercanine width.

Adolescent↗
PubMed1979

The human chin and its relationship to mandibular morphology.

This study evaluated the proportion of the external chin (protuberantia mentalia) in relation to the total symphyseal area in normal jaws and those with a diverse morphology. A sample of 60 cases was randomly selected and divided into three groups of 20 each on the basis of normal growth, horizontal growth and vertical growth with an open bite. Tracings of lateral dn frontal radiographs were used to describe general mandibular form and to determine the percentage of external/total symphyseal area. Dental casts were also examined to determine a basal arch form ratio. The results of this study indicate that the amount of bony chin present is related to certain morphologic features of the mandible. The most significant findings illustrate: 1. The chin increases in size as the mandibular type varies from a vertical type, to a normal type, to a horizontal type of growth pattern. 2. With dental "hypofunction" in combination with an exaggerated vertical development of the mandible, a smaller proportion of the protruding chin is present. 3. The chin increases in size as the mandibular basal arch form varies from a tapered shape for the vertical cases to a more square form in the horizontal cases. 4. The degree of lateral ramal flair does not appear to influence the proportion of protruding chin present. Several models have been presented which attempt to explain protuberantia mentalia variation. The evidence in this study supports the concept that mandibular morphology is the result of the action of compensative adaption in a developing structure. There appears to be an implied polygenic influence on symphyseal morphology operating from the cartilaginous cranial base and mandibular basilar bone. This may be manifested in the relative proportion of mandibular basal bone to cranial base width, and to the vector of cranial base growth. The ultimate proportion of the bony chin is viewed to be the result of mandibular adaption to a functional musculoskeletal balance in the craniofacial complex. The extreme variability of chin form in man may be considered to be the result of compensative growth developing in response to the most structurally efficient jaw form, the contiguous soft and hard tissue environment, and the intrinsic genotype of the mandible.

Adolescent↗
PubMed1982

Anomalies of occlusion predisposing to occlusal interference in children.

The associations between different types of occlusal interference and of occlusal anomalies were studied in children 7, 11 and 15 years of age. Incisor and buccal crossbite and post-normal occlusions were positively related to large antero-posterior distance or lateral deviation between the retruded and intercuspal mandibular positions, and to nonworking side interference. There was a positive correlation between frontal open bite and nonworking side interference, while large overbite was negatively correlated. The correlations found were numerically small, indicating that other factors apart from those studies must be significantly involved in such occlusal interferences.

Adolescent↗
PubMed1991

Vertical malocclusions: etiology, development, diagnosis and some aspects of treatment.

Vertical malocclusions develop as a result of the interaction of many different etiological factors; one of the most important of these factors is mandibular growth. Variations in growth intensity, function of the soft tissues and the jaw musculature as well as the individual dentoalveolar development further influence the evolution of these malocclusions. This article reviews the most common etiological factors and their possible contribution to the development of vertical malocclusions with special emphasis on the role of mandibular growth in the development of open bite and deep bite. The role of the cephalometric morphological analysis in the differential diagnosis of vertical malocclusion is emphasized. Aspects of orthodontic treatment of vertical malocclusions are illustrated with individual cases.

Adolescent↗
PubMed1997

Distal molar movement using the pendulum appliance. Part 1: Clinical and radiological evaluation.

Intra-arch distal molar movement techniques have recently assumed an important role in clinical orthodontics. In this study, the dental and skeletal effects of the pendulum appliance, applying 200 to 250 g of force to the molars in 13 patients (age range 8 years to 13 years 5 months) were evaluated by means of cephalometric radiographs. The results showed that the pendulum appliance moved the molars distally without creating dental or skeletal bite opening and with little incisor anchorage loss. However, important molar tipping should be taken into consideration when using this appliance.

Adolescent↗
PubMed2000

Case report: orthodontic and dentofacial orthopedic considerations in Apert's syndrome.

Apert's syndrome is a developmental malformation characterized by: craniosynostosis, a cone-shaped calvarium, midface hypoplasia, pharyngeal attenuation, ocular manifestations, and syndactyly of the hands and feet. The prodromal characteristic for the typical craniofacial appearance is early craniosynostosis of the coronal suture, the cranial base, and an agenesis of the sagittal suture. These craniofacial characteristics predispose the patient to maxillary transverse and sagittal hypoplasia with concomitant dental crowding, a maxillary pseudocleft palate, and a skeletal and dental anterior open bite. This is a case report of an Apert's syndrome patient with a discussion of the orthodontic and dentofacial orthopedic considerations that influenced the treatment plan.

Acrocephalosyndactylia↗
PubMed2000

Long-term changes in dentoskeletal pattern in a case with Beckwith-Wiedemann syndrome following tongue reduction and orthodontic treatment.

Long-term changes in the dentoskeletal pattern in a 6-year-old Japanese girl with Beckwith-Wiedemann syndrome were demonstrated. The patient showed macroglossia, which is the most common symptom of the syndrome, protruded lower lip, mandibular protrusion and anterior open bite. The jaw base relationship improved to skeletal Class I and the molar relationship to Angle Class I at the early preadolescent period following tongue reduction and phase I orthodontic treatment using a chin cap and tongue crib. Optimum intercuspation of teeth was achieved after edgewise treatment without orthognathic surgery, and a skeletal Class I apical base relationship and good facial profile were maintained after the retention period of 2 years. This case report suggests that early orthodontic treatment with tongue reduction can be effective in a case with Beckwith-Wiedemann syndrome to improve an abnormal dentoskeletal pattern.

Age Factors↗
PubMed2001

The influences of molar intrusion on the inferior alveolar neurovascular bundle and root using the skeletal anchorage system in dogs.

The skeletal anchorage system (SAS) was developed as intraoral rigid anchors for open-bite correction by intrusion of molars. Since the application of SAS is a new modality in orthodontic treatment, the influences of radical molar intrusion on the root and the inferior alveolar neurovascular bundle were unknown. The purpose of this research is to verify the effect of molar intrusion on the neurovascular bundle, the level of osseointegration of bone screws, and root resorption. The results of this study showed mandibular molars were intruded 3.4 mm on the average over 7 months in dogs. The miniplates were well stabilized with osseointegrated bone screws and the peri-implant soft tissues showed slight inflammatory changes. Neither nerves nor blood vessels were damaged. Root resorption was observed but was repaired with new cementum. We concluded that the SAS utilizing transmucosal titanium miniplates as an immovable orthodontic anchorage could provide a new modality for molar intrusions without serious iatrogenic problems.

Alveolar Process↗
PubMed2002

Comparative long term post-treatment changes in hyperdivergent Class II Division 1 patients with early cervical traction treatment.

This was a retrospective study of 45 Class II Division I hyperdivergent patients treated in the mixed dentition with cervical traction and an incisor biteplane. The interjaw or "B" angle (mandibular plane to palatal plane angle) was used to determine hyperdivergency. The treated sample was subdivided into 2 groups reflecting whether the mandibular or palatal plane contributed the greatest amount to the more than 1 standard deviation of the "B" angle from the mean value of the "B" angle present in the 89 untreated Class I controls. Complete records including lateral cephalometric head films were acquired at the start of treatment and 18 to 91 months after discontinuing all retention. Null hypotheses were designed to determine if any significant changes in the "B" angle, mandibular plane angle, or palatal plane angle occurred in the control group or the treated group. Thirty-two angular, linear, and proportional data were accumulated to determine the presence or absence of significant differences. The only significant angular differences found were in the group in which the palatal plane inclination was increased relative to Frankfort Horizontal. In this group, the palatal plane became more nearly parallel to Frankfort Horizontal than in the control group, and showed an increase instead of a decrease in the Y-axis. Proportional and linear data indicated the palatal plane change was a lack of descent of Posterior Nasal Spine while the descent of Anterior Nasal Spine was equal to that of the control group. The increase in the Y-axis was not the result of bite opening, but a lack of mandibular horizontal development as indicated by less of an increase in the Facial Angle. Of the 45 patients, only 4 (9%) required 2 phases of treatment and 1 of those required extraction. Thirty patients (67%) completed treatment with alignment and retraction of the maxillary anterior segment and 11 (24%) had additional alignment of the mandibular anterior segment.

Analysis of Variance↗
PubMed2002

Prevalence of temporomandibular dysfunction and its association with malocclusion in children and adolescents: an epidemiologic study related to specified stages of dental development.

A sample of 4724 children (2353 girls and 2371 boys) (5-17 years old) were grouped not only by chronological age but also by stage of dental development (deciduous, early mixed, late mixed, and permanent dentition). The registrations included functional occlusion (anterior and lateral sliding, interferences), dental wear, mandibular mobility (maximal opening, deflection), and temporomandibular joint and muscular pain recorded by palpation. Headache was the only symptom of temporomandibular dysfunction (TMD) reported by the children. The results showed that one or more clinical signs were recorded in 25% of the subjects, most of them being mild in character. The prevalences increased during the developmental stages. Girls were in general more affected than boys. Significant associations were found between different signs, and TMD was associated with posterior crossbite, anterior open bite, Angle Class III malocclusion, and extreme maxillary overjet.

Adolescent↗