Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Open Bite”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 883 records · Page 49Linked to original sources
PubMed2006

Orthognathic surgery in juvenile rheumatoid arthritis patients.

BACKGROUND: Mandible advancement osteotomy in juvenile rheumatoid arthritis patients for class II anterior open-bite malocclusion is controversial; however, there is no literature discussing outcomes of surgery in this group of patients. An evaluation of such outcomes was undertaken at The Hospital for Sick Children. METHODS: A retrospective chart review revealed that eight patients with juvenile arthritis underwent orthognathic surgery during a period of 5 years. All of the patients had a bilateral sagittal split osteotomy of the mandible, six had a simultaneous Le Fort I osteotomy, and four had an additional advancement genioplasty. The age of the patients at the time of surgery ranged between 17 and 22 years (mean, 18 years), with three male patients and five female patients. The patients were under follow-up for a minimum of 8 months after surgery, and measurements were performed studying preoperative and postoperative lateral cephalometric radiographs. RESULTS: All patients have an improved occlusion and improved facial aesthetics. One patient continued to suffer from temporomandibular joint pain. The mean mandible advancement was 9.6 mm (range, 3.9 to 18.3 mm). The mean mandible relapse after surgery was 2.1 mm (range, 1 to 3.1 mm). No exacerbation of the juvenile rheumatoid arthritis was encountered as a result of the surgical procedure. CONCLUSIONS: Orthognathic surgery in juvenile rheumatoid arthritis patients improves the patient's occlusion, facial aesthetics, and therefore quality of life. The relapse rate postoperatively did not significantly affect the clinical outcome, and the authors recommend orthognathic surgery for this patient population. Future presurgical plans in this patient population will include a small posterior open bite and positioning the incisors edge to edge to allow for some postoperative relapse.

Adolescent↗
PubMed1982

Malocclusion and some functional recordings of the masticatory system in Swedish schoolchildren.

Four hundred and two children aged 7, 11 and 15 years answered a questionnaire and were clinically examined. Sixty per cent of the children had some form of occlusal anomaly. One fifth of 7-year-old children and 3 per cent of 11-year-old children were dummy- or finger-suckers and these children often had crossbite and frontal open bite. The mean maximal opening capacity was 49 mm in 7-year-old children and 53 mm and 57 mm respectively in the two oldest age-groups. The horizontal mobility was almost the same for 11- and 15-year-old children (about 10 mm) but slightly lower in the youngest children. The average distances between the retruded contact and intercuspal positions (RP and IP) antero-posteriorly, vertically and laterally were 0.6 mm, 0.5 mm and 0.3 mm respectively. Most of the children (60%) had a RP-IP displacement of 0.5-1.0 mm antero-posteriorly while 1% had dual bite. Children with postnormal occlusion had a large RP-IP distance antero-posteriorly and children with crossbite a lateral deviation more often than children without these occlusal anomalies. Fourteen per cent of 15-year-old children had dentine visible on at least one incisor. Children with deep bite had less worn teeth than other children.

Adolescent↗
PubMed2006

Treatment in the deciduous dentition: four clinical cases.

Early treatment of certain malocclusions is of great importance in orthodontics when normal growth and development is the objective of our therapy. The four cases presented illustrate the three types of malocclusion which must be treated early: cross-bites (transverse), Class III malocclusions (saggital) and open-bites (vertical). In most of these cases there is a deficiency of the maxilla. The maxilla is the template for the mandible in the early stages of development, and for this reason it should be treated early. As Ricketts said concerning early treatment: The crux of the dilemma is the failure to recognize complete maxillary orthopedics in the three planes of space.

Age Factors↗
PubMed1982

Effect of bite force on the masseteric electromyographic silent period in man.

The duration of the masseteric EMG silent period as induced by tapping on the chin was measured at different levels of sustained bite force. Under both open bite and normal occlusion, the duration of the silent period was inversely related to the magnitude of the bite force. For bite force of the same magnitude, the value of the silent period remained relatively constant for the same subject in different trials (SEM congruent to 1 per cent), whereas the absolute values of the silent periods ranged far and wide for different individuals even under similar experimental conditions.

Adolescent↗
PubMed2002

Bite force determination in children with primary dentition.

The aim of this study was to determine the bite force with primary dentition in 30 children with normal occlusion (group I), cross bite (group II) and open bite (group III). The magnitude of the bite force was determined through a pressurized transmitter tube (pressure sensor MPX 5700 Motorola), which was connected to a converse analog/digital electronic circuit. The children bit the tube with maximum force three times successively for 5 s, with a 10 s interval among each bite, and the sign was sent directly to the computer. The highest value of the three, for each patient, was considered. Analysis of variance evaluated difference among the three groups. The means of maximum bite force were 213 17, 249 63 and 241 19 N for the groups, respectively, and there were no significant statistical differences among them (P > 0.05). The analysis of correlation showed that the weight, height and bite force presented weak positive correlation (r=0.24 and 0.23). It was concluded that in the studied groups the type of occlusion did not affect the maximum values of the bite force and body variables had a small influence in this magnitude.

Analysis of Variance↗
PubMed2004

Managing the orthodontic treatment of patients with advanced periodontal disease: the lingual appliance.

AIM: Treatment of adult patients with advanced periodontal disease is a challenge to the orthodontist using lingual appliance therapy, which is the preferred technique for many adult patients due to its relative invisibility. The lingual technique has been shown to be capable of correcting severe malocclusions, deep bite as well as open bite cases. However, the treatment mechanics are different from the labial technique and require different considerations. METHODS: The potential problems during lingual orthodontic treatment of patients with advanced periodontal disease are discussed, including esthetics during and after orthodontic treatment, efficacy of treatment, adaptation of biomechanics, etc. Three cases are presented to demonstrate the problems and solutions. CONCLUSION: Successful treatment of patients with advanced periodontal disease using the lingual appliance requires specific considerations and a biomechanical approach.

Biomechanical Phenomena↗
PubMed2005

A study of occlusion in elderly Japanese over 80 years with at least 20 teeth.

OBJECTIVES: The purpose of this study was to identify the occlusal status of elderly Japanese over 80 years with at least 20 teeth. MATERIALS AND METHODS: The study enrolled 76 elderly Japanese (44 male, 32 female) with a mean age of 82 years and an average of 25.7 remaining teeth. The study consisted of intra-oral examination, intra-oral and facial photographs, radiographs and impressions for study casts. RESULTS: No gender difference was observed in age or number of remaining teeth. Anteroposterior occlusal relationship was characterised by maxillary protrusion in 67.6%, acceptable overjet in 31.0%, and anterior crossbite in 1.4%. Vertically, deep bite was noted in 33.8%, acceptable overbite in 64.8%, and open bite in 1.4%. Most of the subjects had either Angle class I (68.4%) or class II (25.7%) canine relationship. Only 3.9% of the subjects had upper anterior crowding. Lower anterior crowding was observed in 23.7%, but tended not to be severe. CONCLUSION: These results indicate that Japanese who attained the goal of '8020' have a relatively good occlusion.

Age Factors↗
PubMed2007

Bite force and maxillofacial morphology in patients with Duchenne-type muscular dystrophy.

PURPOSE: The purpose of this study is to evaluate maxillofacial morphology and bite force in patients with severe Duchenne-type myodystrophy. PATIENTS AND METHODS: The subjects included 24 men (average age, 21.5 years; range, 17 to 30 years) with Duchenne-type muscular dystrophy receiving treatment in National Ioh Hospital. Lateral and axial cephalograms were used to assess the morphology in this study. The maximum bite force on the first molar and the maximum mouth opening distance were measured. RESULTS: The anterior open bite was visualized in most patients on the lateral cephalogram. The upper and lower arch lengths in the patients were significantly smaller than those in the controls (P < .05). In contrast, the upper and lower arch widths in the patients were significantly larger than those in the controls (P < .05). The maximum bite force and maximum mouth opening distance in the patients were significantly lower than those in the controls (P < .05). CONCLUSION: These results appear to be very useful for improving the care and treatment of patients with Duchenne-type muscular dystrophy.

Adolescent↗
PubMed2006

Prevalence and development of KIG-relevant symptoms in primary school students from Frankfurt am Main.

OBJECTIVE: To determine the actual need for orthodontic treatment in the late mixed dentition according to the German KIG system (Kieferorthopädische Indikationsgruppen = Orthodontic Indication Groups). By comparing the findings with those of the early mixed dentition, we aimed to evaluate whether a change in the spectrum of malocclusions would occur. SUBJECTS AND METHODS: Dental check-ups took place in schools in Frankfurt am Main, during which the orthodontically-relevant symptoms of 1251 schoolchildren (female 49.5%, male 50.5%) in grades 4 and 5 were recorded and compared with findings documented 4 years earlier in the same classes at the same schools. RESULTS: Of those orthodontic malocclusions in need of therapy and covered by the statutory health insurance, lateral crossbite and enlarged overjet (more than 6 mm) dominated by 9.2% and 8.7%, respectively, among the 9- to 11-year-old children. Of all the malocclusions recorded within the KIG-group showing a treatment need degree > or = 3, category D4 (overjet greater than 6 mm) at 17.4% was the most frequent, followed by K4 (unilateral crossbite) at 15.3%, and M4 (negative overjet up to -3 mm) at 14.9%. 41.4% of all the children examined presented a treatment indication according to statutory health insurance directives (KIG > or = 3). The 10% reduction in treatment cases financed by statutory health insurance has been achieved in any case [1], as mandated by health policy. CONCLUSIONS: Our comparison of results gathered from 2000 and 2004 showed that as the children grew older, the prevalence of already-enlarged overjets increased, as did the frequency of deep bite. We observed fewer frontal open bites and crossbites in late mixed dentition. Treatment need according to current statutory health insurance directives was clearly higher in the late mixed dentition (41.4%) than in the early mixed dentition (8%).

Age Factors↗
PubMed1992

An orthodontic study of temporomandibular joint disorders. Part 1: Epidemiological research in Japanese 6-18 year olds.

Malocclusion is considered one of the etiological factors of temporomandibular joint disorder (TMD). The purpose of this study was to investigate the prevalence of TMD and the relationship between TMD and the type of occlusion. The sample consisted of 7337 Japanese children, 6-18 years old, 3219 boys and 4118 girls. TMD symptoms were recorded as well as the type of occlusion in children with TMD. The prevalence of TMD overall was 12.2%. The prevalence increased with age and was slightly higher in girls (13%) than in boys 11.1%. This difference was not statistically significant. Joint sound as the only symptom was more common in younger subjects. TMD symptoms seemed more complicated with age when pain and abnormal jaw movement combined with sound. Joint sound was the most common symptom (89.3%), followed by the combination of sound and pain (2.2%). The incidence of other symptoms was under 1%. In subjects with TMD, 24.9% exhibited crowding, 20.1% had excessive overjet, 6.8% deep bite, 6.3% edge-to-edge bite, 5.6% anterior crossbite, 5.4% open bite, and 3.8% posterior crossbite. Morphologically normal occlusion was observed in 27.1%. In this study, many subjects with TMD had malocclusions. Early treatment may be important in the prevention of severe TMD. Although those with morphologically normal occlusions were included, a more detailed study concerning other causes of TMD is needed also.

Adolescent↗
PubMed2001

Posterior disk displacement of the TMJ: MRI evidence in two cases.

Posterior disk displacement is a rare temporomandibular joint (TMJ) disorder. The main clinical sign is sudden molar open-bite (jaw locked in the open position). This may be accompanied by a sensation of intra-articular foreign body and more rarely joint pain. Joint sounds are unremarkable. Mouth opening may be slightly impaired. Hypothetically, like anterior disk displacements, posterior disk displacements can be classified as either reducible or nonreducible. A definitive diagnosis requires magnetic resonance imaging (MRI). There is no consensus concerning treatment. A conservative course of treatment can be successful in patients with functional impairment and should always be attempted before irreversible, invasive therapy.

Adult↗
PubMed1985

Mandibular dysfunction in 10-18 year old school children as related to morphological malocclusion.

An association was sought between certain morphologic characteristics of malocclusion--Angle classification, over-bite, over-jet, open-bite, cross-bite and crowding--and the presence or absence of three cardinal symptoms of mandibular dysfunction--joint sounds, joint sensitivity to palpation and muscle sensitivity--in a sample of 369 Israeli school children. In addition, two additional independent variables, 'occlusal wear' and 'previous orthodontic treatment' were introduced into the statistical analysis. Occlusal wear and abnormal overbite were the only factors found to increase significantly the presence of dysfunction symptoms.

Adolescent↗
PubMed2001

Overbite correction and sagittal changes: late mixed-dentition treatment effects.

This study involved the assessment of pre- and post-treatment lateral cephalograms from 182 late mixed-dentition patients with Class I and Class II malocclusions, with or without crowding, selected before treatment commenced. It was designed specifically to determine whether antero-posterior mandibular dento-alveolar and skeletal changes occurring with growth and one particular late mixed-dentition treatment approach are influenced in any way by the required amount of incisal overbite correction to be achieved with treatment. Significantly greater forward movements were found at both point B and pogonion in non-headgear patients in whom very deep overbites had been reduced, when compared with patients with less required incisal overbite reduction. This finding would seem to have provided further quantitative evidence to support the concept of unlocking of dento-alveolar structures with early reduction of very deep incisal overbites in appropriate patients. The suggestion was therefore made that the bite-opening in such deep-bite patients should be undertaken at least as early as this late mixed-dentition stage in order to provide an improved environment for the mandibular dento-alveolus as the mandible itself moves forward with normal growth.

Analysis of Variance↗
PubMed2004

Hand and wrist injuries: Part II. Emergent evaluation.

Primary care physicians must be able to recognize wrist and hand injuries that require immediate attention. A complete history and physical examination, including assessment of distal limb function, are essential. Hemorrhage control is necessary in patients with vessel lacerations and amputations. Amputations require an understanding of the indications and contraindications in the management of the amputated limb. High-pressure injection injuries and compartment syndromes require a high index of suspicion for early recognition. Infectious entities include "fight bite," open fractures, purulent tenosynovitis, animal bites, and retained foreign bodies. Tendon disruptions should be recognized early to optimize management.

Amputation, Traumatic↗
PubMed1993

Cephalometric evaluation of maxillary retrognathism cases treated with FR-3 appliance.

The purpose of this investigation was to evaluate the efficiency of the FR-3 appliance on functional Cl III malocclusion cases. A total of 45 functional Cl III cases were chosen from a general clinic intake of which 25 were treated with the FR-3 appliance and 20 were untreated and were taken as a control group. Patients that were treated with FR-3 had the following characteristics: Cl III with maxillary deficiency; functional anterior cross-bite; absence of anterior open-bite; patients in mixed dentition. The mean age in the treatment group was 8.4 years 8.8 years in the control group. The observation period was one year for both groups. The results were as follows: Sagittal forward growth stimulation was not observed in the maxilla. Mandibular growth was redirected in the vertical direction. The SNB angle decreased in that the mandible rotated downward and backward. The ANB angle increased. There was an increase in total and lower anterior facial height and reduction in the overbite. Another skeletal change observed was the increase in the cranial flexure angle. Improved dental results were a significant amount of overjet increase and a decrease in the IMPA. There was also a beneficial effect on the soft tissue profile.

Cephalometry↗
PubMed2005

Rehabilitation of a hemophiliac with implants: a medical perspective and case report.

A patient suffering from classical hemophilia had previous surgery for ankylosis of the right temporomandibular joint. This was replaced by a costochondral graft and an overlay of temporalis muscle. A bilateral sagittal split was performed for a micrognathic mandible and a sleep apnea problem. That procedure solved the sleep apnea; however, it resulted in a prognathic mandible and an anterior open bite. The lower anterior teeth were periodontally involved with impaired alveolar support. The restricted opening of the oral cavity of 18 mm between maxillary and mandibular centrals and the potential danger of bleeding complicated the surgical and restorative procedures. The patient was prepared medically on each of 4 occasions with factor VIII replacement concentrate, and oral antifibrinolytic therapy (tranexamic acid). The treatment of choice was the extraction of the remaining lower incisors and their replacement with an implant-supported temporarily cemented retrievable fixed prosthesis. Serial extractions and chairside temporization provided the surgeon with precise guides for implant placement, and enabled the patient to enjoy unimpaired function through periods of healing and osseointegration.

Dental Implantation, Endosseous↗
PubMed2003

[The influence of occlusal interferences on pulp vitality threshold in permanent dentition].

UNLABELLED: Examination of pulp vitality is a valuable aid in diagnosis and treatment and thus has been in use for a long time. Numerous factors influencing the pain threshold have been found including occlusal interferences. The effect of EOI (Experimental Occlusal Interferences) has been described, while the effect of primary occlusal interference awaits further investigation. The aim of this work was to evaluate the influence of malocclusion (primary occlusal interference) on pulp vitality. At first, the pattern of bite forces in normal occlusion was established. For this purpose, 20 individuals were examined. The following results were found: (a) Bite forces on the right and left side are symmetrical; (b) Total bite forces are distributed as follows: (I) upper half arch: medial incisor 6.3%, lateral incisor 2.9%, canine 3.6%, first premolar 10.4%, second premolar 11.7%, first molar 29.4%, second molar 23.8%; (II) lower half arch: medial incisor 4.1%, lateral incisor 4%, canine 4.8%, first premolar 9%, second premolar 15.1%, first molar 27.3%, second molar 29.7% (Fig. 4). Next, 83 patients with unilateral malocclusion were subjected to clinical examination (orthodontic diagnosis) and measurement of bite forces (with T-Scan system). A computer program was used to establish bite forces (in %) for each tooth. 576 teeth were divided into 9 groups in accordance with the orthodontic diagnosis as follows: class II tendency (n = 126), cross-bite (n = 50), rotated (n = 30), scissors bite (n = 23), class III tendency (n = 19), class II (n = 16), open bite (n = 15), class III (n = 9), normal occlusion (n = 288). Each tooth in malocclusion was assigned a contralateral "control" tooth (Fig. 5). Bite forces acting on teeth in malocclusion were compared with control teeth using Student's t-test (Fig. 6). There is no difference between bite forces of teeth in normal occlusion and malocclusion on the opposite side of dental arches in the same patient, the only exceptions being open and cross-bite. Bite force values obtained in a group with normal occlusion and those reported by Blamphin, Kochańska and Gidzińska-Głódkowska formed parallel lines (Fig. 7). Pulp vitality threshold was measured at the buccal and occlusal side in all teeth of the group of 83 patients. Measurements were performed using Ez-Test (Satelec). The results are summarized in Table I. CONCLUSIONS: 1. Bite forces are symmetrical on the right and left side and differ for each tooth. 2. There is no difference between bite forces of teeth in normal occlusion and malocclusion on the opposite side of dental arches in the same patient except for open and cross-bites. 3. Bite forces in patients with unilateral malocclusion are slightly lower than in patients with normal occlusion. 4. There is no difference between pulp vitality in normal occlusion and malocclusion on the opposite side of dental arches in the same patient. 5. Pulp vitality threshold is higher at the buccal than occlusal side. 6. Pulp vitality threshold decreases with age and differs with gender.

Bite Force↗