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At least 271 records · Page 15Linked to original sources
PubMed1992

Stability of surgical correction of patients with Skeletal III and Skeletal II anterior open bite, with increased maxillary mandibular planes angle.

The surgical correction of eleven Class III patients and 10 Class II patients with a long face, increased maxillary mandibular planes angle and anterior open bite was undertaken using bimaxillary surgical procedures. Lateral skull radiographs were examined pre-operatively, 48 hours, and 1 year post-operatively, to quantify the amount and direction of surgical change achieved and the subsequent stability. There was no consistent pattern in the actual movements achieved in either group of patients in the maxillae or the mandibles. Some of the cases being impacted and continuing to impact, others impacting then relapsing. In the Class III patients some of the mandibular set backs remained stable others relapsing and some continuing to move posteriorly. However, despite these inconsistent patterns, there was a 7-degree reduction in the maxillary mandibular planes angle which relapsed by 1.7 degrees over the first year. The overbite was increased from -6 mm to +3.1 mm post-operatively and this relapsed at the 1 year stage to +2.4 mm. The overjet reduced from -4 to 1.7 mm and continued to improve to -0.9 mm at the 1-year stage. In the Class II patients some of the mandibular advancements remained stable others relapsing and some continuing to advance. However, despite these inconsistent patterns there was a 9-degree reduction in the maxillary mandibular planes angle which reduced by a further degree at the 1 year stage. The overbite was increased from -4.6 to -1.6 mm post-operatively and this remained stable at the 1 year stage.(ABSTRACT TRUNCATED AT 250 WORDS)

Cephalometry↗
PubMed1993

[A theoretical study of bite opening with Begg technique].

The authors made a thorough and careful study on the Begg Stage I appliance and established a model of mechanics in accordance with the actual situation of arch wire being activated and derived a mathematical formula based on the elastic small deflection theory. This study provides not only the basis of choosing intrusive-force value for individual arches, but also the possibility of analysing dynamically the changes of intrusive- force value in the process of bite opening.

Biomechanical Phenomena↗
PubMed1980

Tongue strength: its relationship to tongue thrusting, open-bite, and articulatory proficiency.

Maximum protrusive tongue strength was measured for two experimental groups of 35 normal speaking children and 21 children with frontal lisping, anterior tongue thrusting during swallow, and open-bite malocclusion, and a control group of 85 children with normal speech and occlusion who did not thrust their tongues during swallow. No significant differences in tongue strength were found among these groups. The findings were interpreted to support the view that tongue strengthening exercises recommended by some authors for the correction of tongue thrusting or associated frontal lisping may be superfluous.

Adolescent↗
PubMed1996

Treatment of an adult with a severe anterior open bite and mutilated malocclusion without orthognathic surgery.

A case report of a 19-year, 7-month-old young woman who had an Angle Class I mutilated malocclusion, characterized by a skeletal/dental anterior open bite, crowding, thumb-sucking habit, and bimaxillary dental protrusion is presented. A nonsurgical approach was used to obtain significant improvement in occlusion and in facial esthetics. [This case report was presented to the American Board of Orthodontics in partial fulfillment of the requirements for the certification process conducted by the Board.]

Adult↗
PubMed1991

Temporalis and masseter muscle activity in patients with anterior open bite and craniomandibular disorders.

Activity in temporalis and masseter muscles, and traits of facial morphology and occlusal stability were studied in 22 patients (19 women, 3 men; 15-45 yr of age) with anterior open bite and symptoms and signs of craniomandibular disorders. Facial morphology was assessed by profile radiographs, occlusal stability by tooth contacts, and craniomandibular function by clinical and radiological examination. Electromyographic activity was recorded by surface electrodes after primary treatment with a reflex-releasing, stabilizing splint. Maximal voluntary contraction was reduced compared to reference values, particularly in subjects with muscular affection, but maximal activity increased significantly when biting on the splint. Maximal voluntary contraction was positively correlated to molar contact and negatively to anterior face height, mandibular inclination, vertical jaw relation and gonial angle. Relative loading of the muscles was markedly increased during resting posture. It was concluded that reduced occlusal stability and long-face morphology were associated with weak elevator muscle activity with disposition overload and tenderness. The results also indicated that increase of occlusal stability might lead to increased muscle strength and possibly reduce risk of physical strain.

Adolescent↗
PubMed2005

Effects of bite-opening and cyclosporin A on the mRNA levels of myosin heavy chain and the muscle mass in rat masseter.

To gain more insight into the mechanism of muscle plasticity in response to mechanical overload, we analyzed the effects of bite -opening (BO, 3 mm increase in the vertical dimension for 2 weeks) and/or a calcineurin (CaN) inhibitor, cyclosporin A (CsA, 10 mg/kg body weight, once daily for 2 weeks, ip) treatment on the myosin heavy chain (MHC I, IIa, IId/x, IIb) mRNA levels, using real-time RT-PCR with specific primers and on the muscle mass in rat masseter. As compared with normal control (n = 6), the BO treatment (n = 6) significantly increased the MHC I (p < 0.05) and the IIa mRNA levels (p < 0.01), and the CsA treatment (n = 6) significantly decreased the MHC I mRNA level (p < 0.01) in association with the significant decrease in the MHC IIb mRNA level (p < 0.05). The BO + CsA treatment (n = 6) significantly increased the MHC IIa mRNA level (p < 0.01) in association with the significant decrease in the MHC IIb mRNA level (p < 0.01), as compared with control. The masseter muscle mass was significantly decreased by either the CsA (p < 0.05) or the BO + CsA treatment (p < 0.001), but slightly increased by the BO treatment. These results suggest that in rat masseter the BO treatment produces not only the up-regulation of MHC IIa mRNA independently of CaN-signaling pathways, but also the MHC mRNA transition from IIa to I and the muscle mass maintenance mainly of type IIb fiber through the CaN-signaling pathways.

Animals↗
PubMed1995

The use of implants for orthodontic correction of an open bite.

This case illustrates the integration of maxillofacial surgery, orthodontics, prosthodontics and periodontics in the treatment of an adult male. A traumatic injury to the lower jaw was the stimulus for the patient to seek orthodontic correction of a severe malocclusion including crossbites and an anterior open bite. The loss of a large portion of the anterior alveolar process of the lower jaw including six teeth was corrected with an implant bearing prosthesis which was subsequently used as anchorage to correct the malocclusion. Through the combined efforts of the above disciplines, properly orchestrated, this patient was treated in an effective and successful manner.

Adult↗
PubMed1999

Evidence of correction of open bite malocclusion using active vertical corrector treatment.

This study used a cephalometric analysis that isolated tipping and bodily tooth movements of the upper and the lower incisors and measured vertical skeletal changes in the anterior region of the maxilla and mandible to evaluate the outcome of two-phase nonextraction treatment for open bite malocclusion. Twenty-nine subjects treated with an active vertical corrector (AVC) followed by fixed 022 orthodontic appliances were selected by one orthodontist from his private practice. All subjects lacked vertical incisor contact at the start of treatment and had adequate initial, end of phase 1, and deband lateral cephalograms. Each subject in the treated group was matched by age and sex with an untreated subject from the Broadbent Bolton Collection, Cleveland, OH. Data were collected for three time intervals; phase 1 treatment with the AVC (T1 to T2), phase 2 fixed-appliance treatment (T2 to T3), and over the total treatment period (T1 to T3). Analysis of the data showed no statistically significant (P < or = .002) changes between treated subjects and controls for any variables during the phase 1 (T1 to T2) or phase 2 (T2 to T3) treatment intervals. However, overbite was significantly improved compared with controls (P < or = .002) during the T1 to T3 time interval. It was concluded that two-phase treatment with the AVC followed by fixed orthodontic appliance treatment results in a statistically significant increase in incisor overbite. The observed increase in overbite was the result of small but clinically significant changes in relative mandibular vertical growth, bodily incisor movement toward the occlusal plane, and lingual tipping of the lower incisors.

Adolescent↗
PubMed1997

Pain, tenderness, mandibular mobility, and anterior open bite in relation to radiographic erosions in temporomandibular joint disease.

The relationship between radiographic changes and clinical signs and symptoms of the temporomandibular joint (TMJ) was investigated in 39 patients with joint diseases. Radiographic erosions were found in 33% of the TMJ joints, and overall frequency of radiographic changes including remodeling was 47%. Fifty-four percent of the patients had an anterior open bite (AOB). The AOB showed statistically significant correlation to the extension of erosion of the TMJ. Pain expressed by means of a visual analog scale, tenderness to palpation of the TMJ, and pressure pain threshold showed no significant correlation to erosion, but mandibular mobility showed significant negative correlation to erosive changes. In conclusion, AOB is correlated with erosive radiographic changes in this patient group. However, the degree of local pain and tenderness showed no correlation to radiographic changes.

Adult↗
PubMed1990

An esthetic approach to vertical root extrusion in a patient with an anterior open bite: report of case.

A previous attempt to locate the root canal system in the maxillary left central incisor with a bur created a perforating root defect at the level of the alveolar crest. The patient received root canal therapy. Next, vertical root extrusion was chosen to expose sound tooth structure apical to the defect so that a crown could be constructed. With an anterior open bite, the natural crown was left intact and it was possible to position the anchor bar in an incisal and lingual position, maintaining esthetics for the patient during both the extrusive and stabilization phases of treatment.

Adult↗
PubMed1982

Postural response of the head to bite opening in adult males.

The postural position of the head is a resultant of muscular interactions and reactions, influenced by gravity and functional demands. In order to investigate possible postural adaptation of the head to an altered functional status, a standard degree of jaw opening was produced by mechanical means in the mouths of thirty young males. There was an extension of the head associated with the jaw separation. In the majority of cases, a recovery to approximately the original posture resulted within 1 hour after removal of the bite-opening device.

Adaptation, Physiological↗
PubMed1986

A clinical assessment of the Active Vertical Corrector--a nonsurgical alternative for skeletal open bite treatment.

This article describes the Active Vertical Corrector (AVC), which is a simple removable or fixed orthodontic appliance that intrudes the posterior teeth in both the maxilla and mandible by reciprocal forces. By the use of effective posterior intrusion of teeth, the mandible is allowed to rotate in upward and forward directions. The uniqueness of this appliance is that it allows the clinician to correct anterior open bite problems by actually reducing anterior facial height. This treatment approaches the problem at its cause (overeruption of posterior teeth) and provides better facial balance and esthetics than most conventional orthodontic treatment procedures. Problems formerly thought to require orthognathic surgery can now be treated successfully with the AVC.

Adolescent↗
PubMed1998

Open bite due to lip sucking: a case report.

Lip sucking, in spite of being less frequent than other habits, can cause malocclusion, which in turn may favor the appearance of other new habits such as tongue thrust. The elimination of this habit can lead to the spontaneous correction of malocclusion. The case report of a three-year-old male with a lip sucking habit is presented. After eliminating the habit, the open bite that it had caused, corrected spontaneously.

Child, Preschool↗
PubMed1992

Modified use of a dynamic bite opener--treatment and prevention of trismus in a child with head and neck cancer: a case report.

Trismus may be a complication arising during or after treatment of patients with head and neck cancer. Treatment of trismus is difficult, making prevention very important. To prevent and treat trismus in a patient with a nasopharyngeal tumor, the Contract-Relax-Antagonist-Contract (CRAC) technique was applied, with the aid of a custom-made dynamic bite opener (DBO). The CRAC technique in combination with the DBO, as a therapy/prevention program for trismus, is not referred to in the literature. The combination of CRAC and DBO appeared to be a gentle and effective method well tolerated by the patient.

Adolescent↗
PubMed2000

Long-term stability of surgical open-bite correction by Le Fort I osteotomy.

Skeletal changes greater than those observed in untreated adults have been noted beyond 1 year post-surgery in adult patients who had surgical correction of a long face deformity. The stability of skeletal landmarks and dental relationships from 1 to >3 years post-surgery was examined in 28 patients who had undergone surgery of the maxilla only, and in 26 patients who had undergone 2-jaw surgery to correct >2 mm anterior open bite. Although the average changes in almost all landmark positions and skeletal dimensions were less than 1 mm, point B moved down >2 mm and face height increased >2 mm in one-third of the maxilla-only group and in 40% of the 2-jaw group (>4 mm in 10% and 22% respectively). Overbite decreased 2-4 mm in only 7% of the maxilla-only and 12% of the 2 groups, with no changes >4 mm, because in three-fourths of the patients with an increase in anterior face height, further eruption of the incisors maintained the overbite relationship. In the maxilla-only group, mandibular length (Co-Pg) showed >2 mm long-term change in 45% of the patients, two-thirds of whom showed an increase rather than a decrease in length. In the 2-jaw group, no patients showed a decrease in Co-Pg length and one-third had an increase. For both groups, changes in overjet were smaller and less frequent than changes in mandibular length.

Adaptation, Physiological↗
PubMed1977

Sagittal splitting of the body of the mandible (Mehnert's technique) for correction of open bite and deep over bite.

The sliding of the inner and outer cortex of the mandible based on the sagittal splitting (Obsegeser 1955) is usually confined to the ramus and angle area. It can, however, also be performed in the body of the mandible even in cases with normal dentition. In these cases, the sagittal split is carried out below the dentoalveolar region (Mehnert 1959). The technical possibilities and the experiences made are shown. It can be concluded that this technique is particularly indicated in cases of open bite and severe deep over bite whether they are associated or not with a prognathism or retromandibulism of moderate degree.

Humans↗