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At least 163 records · Page 9Linked to original sources
PubMed2000

Anterior open-bite malocclusion: stability of maxillary repositioning using rigid internal fixation.

A retrospective cephalometric study was performed to investigate the stability of 37 non-growing anterior open-bite cases using mini-plate rigid fixation. The sample was divided into two groups: Group A: maxillary repositioning alone (17 cases) and Group B: bimaxillary surgery (20 cases). Tracings were performed pre-operatively (T1), immediately post-operatively (T2) and at a minimum of one year follow-up (T3) (12-90 months). In Group A, the maxilla was advanced (3.8 +/- 2.8 mm, p < 0.01) and superiorly repositioned at PNS (2.8 +/- 2.3 mm, p < 0.001). In Group B, the maxilla was advanced (3.5 +/- 3.0 mm, p < 0.01) and superiorly repositioned at PNS (3.7 +/- 1.8 mm, p < 0.001); and the mandible (11.7 +/- 3.8 mm, p < 0.001), with no significant change in the vertical plane (p > 0.05). Late relapse due to condylar remodelling or resorption was found as a cause of large horizontal relapse (8.0 < x < 14.0 mm) in three cases (15%), the amount being associated with the amount of operative advancement (r = 0.7, r-sq = 40%, p < 0.01). It was concluded that the correction of anterior open bite by posterior repositioning of the maxilla using rigid fixation is a stable procedure during the follow-up period, and that in bimaxillary cases, post-operative stability depends largely on the stability of the mandibular advancement, which in turn relates to the amounts of advancement, the pre-operative anterior open bite and the mandibular plane angle.

Adolescent↗
PubMed1988

Sudden open bite resulting from hemarthrosis: report of a case.

In contrast to chronic inability to open the mouth, inadequate closure of the jaws seldom occurs. The present case describes a young women with hereditary hyperlipoproteinism on an anticoagulant who suddenly developed an unilateral open bite due to a hemarthrosis of the left TMJ. After aspiration of the accumulated blood in the temporomandibular joint, the open bite disappeared and the occlusion became normal.

Adolescent↗
PubMed2000

Cephalometric evaluation of patients with anterior open-bite.

Cephalometric evaluations of the skeletal pattern of 30 patients with anterior open-bite malocclusion were compared to those of 30 individuals with a normal overbite. The posterior/anterior face height ratio (PFH/AFH) was the only skeletal characteristic statistically different in the two groups. The other cephalometric measurements were not found to be statistically different in the malocclusion and normal overbite groups (SN-GoGn, SN-PP, gonial angle, LFH/AFH ratio), indicating that there is no skeletal origin in the group with anterior open-bite in this study.

Cephalometry↗
PubMedDate not supplied

[Frequency of overjet, overbite and open bite in the deciduous dentition].

The authors studied the frequency of overjet, overbite and open bite in deciduous dentition in one hundred and twenty Brasilian white children, of both sexes, aged between 2 and 6 years old. The results showed that the deciduous dentition of that children was characterized for a moderate overjet and a light overbite and that overjet and open bite degree decrease with the increasing of the children's age.

Brazil↗
PubMed1981

Primary failure of eruption: a possible cause of posterior open-bite.

Failure of posterior teeth to erupt fully into occlusal contact produces a lateral open-bite. These problems usually are attributed to a mechanical interference with the eruptive process, either ankylosis or some soft-tissue interference. In some patients, lateral open-bite is due to a disturbance of the eruption mechanism itself so that nonankylosed teeth cease to erupt. Influences on the eruption of teeth are reviewed, and possible causes of "primary failure of eruption" are discussed. The limitations of treatment for patients with eruption failure are described and illustrated by case reports.

Adolescent↗
PubMed1998

Interleukin-1beta in synovial fluid from the arthritic temporomandibular joint and its relation to pain, mobility, and anterior open bite.

PURPOSE: The purpose of this study was to investigate whether interleukin-1beta in synovial fluid or blood plasma is involved in the development of pain or hyperalgesia of the temporomandibular joint (TMJ), as well as reduced mandibular mobility and anterior open bite. PATIENTS AND METHODS: Twenty-nine patients with TMJ arthritis and seven healthy subjects were studied. VAS measurement of TMJ tenderness on palpation of the TMJ (TDP), TMJ pressure pain threshold and tolerance level (PPTL), mandibular mobility, pain during joint movements, and degree of anterior open bite (AOB) were assessed. IL-1beta levels were analyzed in TMJ synovial fluid (SF-IL-1beta) and blood samples and correlated with the preceding factors. RESULTS: SF-IL-1beta showed significant positive correlations with VAS measurement of pain, TDP, and AOB and a negative correlation with PPTL. CONCLUSIONS: This study indicates that IL-1beta in the synovial fluid is associated with pain and hyperalgesia in the TMJ region as well as an anterior open bite. Concerning the latter condition, IL-1beta seems to be a warning signal of tissue destruction.

Adult↗
PubMed1985

The inverted L osteotomy for treatment of skeletal open-bite deformities.

Numerous surgical procedures have been proposed for the correction of the skeletal open-bite deformity. Mandibular ramus procedures have not been uniformly successful due to the amount of observed relapse in both the horizontal and vertical dimensions. The authors studied 20 patients who underwent correction of an open-bite deformity using the inverted L ramus osteotomy technique. Results indicated that this procedure may have more stability in both the horizontal and vertical dimensions than previously reported ramus procedures.

Adolescent↗
PubMed2006

Treatment of post-traumatic open bite by radiofrequency.

An 18-year-old man with a fracture of the mandibular symphysis and both condylar heads was treated by open reduction of the fractured symphysis and closed reduction of the fractures of the condylar heads. As the open-bite was not resolved by the operation, elastic traction was applied for three weeks, but there was no improvement. Finally, we gave radiofrequency treatment to the anterior bellies of the digastric muscle, after which the open-bite disappeared and at the follow-up examinations there was no recurrence.

Adult↗
PubMed2001

A case of anterior open bite developing during adolescence.

Imaging studies have reported on the relationship between temporomandibular joint (TMJ) degeneration and facial deformity. These studies have suggested that mandibular growth is affected by TMJ degeneration, resulting in altered skeletal structure as mandibular retrusion. However, there are very few longitudinal case reports on TMJ osteoarthrosis (OA). Progressive open bite occurred in an adolescent patient with TMJ OA. Cephalometric analysis showed a downward and backward rotated mandible, and a labial inclination of the upper incisor. Magnetic resonance imaging showed internal derangement without reduction and erosion in the right and the left condyles. Although the cause of open bite is unclear in this case, tongue thrusting, and internal derangements in the temporomandibular joint were suspected as causes of the open bite.

Bone Resorption↗
PubMed1985

[Open bite in children. Contribution to its study].

A statistic and processing study of 40 cases of open bite deformities in infants is proposed from exact clinical examinations, and various teleradiographic analysis (Coutand, Delaire, Tweed, Sassouni). The statistic study set off the anatomical complexity of open bite deformities. The processing study, recording the concordance among various teleradiographic techniques, clear 4 associated dysmorphic groups susceptible to allow adjusted treatment planning.

Cephalometry↗
PubMed2004

Long-term stability of anterior open bite extraction treatment in the permanent dentition.

The purpose of this study was to cephalometrically evaluate the long-term stability of anterior open bite extraction treatment in the permanent dentition after a mean period of 8.35 years. Cephalometric headfilms were obtained at pretreatment, posttreatment, and postretention stages from 31 patients who had undergone orthodontic treatment with fixed appliances. Two control groups were used. The first, with an age similar to that of the experimental group before treatment, was used only to characterize it. The second, with normal occlusion, was followed longitudinally for a period comparable with the posttreatment period and was used to compare changes during this period. The differences between the observation stages in the experimental group were analyzed with paired t tests, and the posttreatment changes were compared with the changes of the second control group with independent t tests. There was no statistically significant decrease of the obtained anterior overbite at the end of the posttreatment period. The primary factors that contributed to the nonsignificant decrease of the overbite were the normal vertical development of the maxillary and mandibular incisors, the smaller vertical development of the mandibular molars, and the consequent smaller increase in lower anterior face height, as compared with the control group in the long-term posttreatment period. Additionally, 74.2% of the sample had a "clinically stable" open bite correction.

Adolescent↗
PubMed1995

[The therapeutic effects after the dentoalveolar compensation of skeletal open bite in adults. The skeletal and dental parameters].

In the following study 20 adult skeletal open-bite patients were analysed after they had undergone dental compensation to camouflage the underlying skeletal discrepancy. The initial and final cephalometric records were analysed to determine the factors that led to the desired goal. The results showed no significant difference in the skeletal relationship. Molar intrusion was not recorded. The open-bite was correct mostly by reclining the upper incisors and by changing their position. Significant differences existed between the obtained results and the mechano-therapy employed. The geometrical model developed on the of the above makes it possible to predict and predetermine the targeted vertical dimension. Furthermore the results show extrusion of the front teeth as another dominant factor.

Adolescent↗
PubMed1992

The effect of treatment of skeletal open bite with two types of bite-blocks.

The treatment of anterior skeletal open bite was studied in two groups of children. The children of one group wore a removable spring-loaded bite-block in the lower jaw for one year. The bite-block exerted an intrusive force on the upper and lower posterior teeth. The children of the other group were treated for 3 months with bite-blocks with repelling magnets. These bite-blocks were cemented on the posterior teeth of both jaws. The effects of treatment were monitored by measurement of the bite-force (group with spring bite-blocks only), by electromyographic recording of the activity of the temporal and masseter muscles, and by X-ray cephalometry. Recordings were made before, during, and at the end of the treatment, and at a follow-up observation. The bite-force increased during the first months of treatment, but was then unchanged. The activity of the masseter muscle during maximal bite also increased in the first part of the period of treatment with a spring bite-block. In the group treated with magnetic bite-blocks, there was an increase in the resting activity of the masseter muscle and in the chewing activity of the anterior temporal muscle. The effects of the treatment on bite and facial morphology were less marked in the group with spring bite-blocks than in the group with magnetic bite-blocks, with an average improvement of the overbite of 1.3 mm with the spring bite-block therapy. In the group with magnetic bite-blocks, the average improvement in overbite was 3 mm. This was thought to be due to anterior rotation of the mandible and increased eruption of the incisors. The mandibular rotation was a result of intrusion of the upper and lower posterior teeth and possibly also increased mandibular growth. A follow-up of the cases treated with magnetic bite-blocks revealed a tendency for the beneficial effects of the treatment to relapse which possibly could be counteracted by a long phase of active retention.

Bite Force↗
PubMedDate not supplied

[Clinical notes on 3 years of treating open bite].

Personal experience in the treatment of open bite is described, with particular reference to cases complicated by interposition of the tongue. A classification felt to be of importance in diagnosis and prognosis is proposed.

Adolescent↗
PubMed2004

Influences of head positions and bite opening on collapsibility of the passive pharynx.

A collapsible tube surrounded by soft material within a rigid box was proposed as a two-dimensional mechanical model for the pharyngeal airway. This model predicts that changes in the box size (pharyngeal bony enclosure size anatomically defined as cross-sectional area bounded by the inside edge of bony structures such as the mandible, maxilla, and spine, and being perpendicular to the airway) influence patency of the tube. We examined whether changes in the bony enclosure size either with head positioning or bite opening influence collapsibility of the pharyngeal airway. Static mechanical properties of the passive pharynx were evaluated in anesthetized, paralyzed patients with sleep-disordered breathing before and during neck extension with bite closure (n = 11), neck flexion with bite closure (n = 9), and neutral neck position with bite opening (n = 11). Neck extension significantly increased maximum oropharyngeal airway size and decreased closing pressures of the velopharynx and oropharynx. Notably, neck extension significantly decreased compliance of the oropharyngeal airway wall. Neck flexion and bite opening decreased maximum oropharyngeal airway size and increased closing pressure of the velopharynx and oropharynx. Our results indicate the importance of neck and mandibular position for determining patency and collapsibility of the passive pharynx.

Adult↗