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At least 37 records · Page 2Linked to original sources
PubMed2000

Dental occlusion modifies gaze and posture stabilization in human subjects.

Repercussion of dental occlusion was tested upon postural and gaze stabilization, the latter with a visuo-motor task evaluated by shooting performances. Eighteen permit holders shooters and 18 controls were enrolled in this study. Postural control was evaluated in both groups according to four mandibular positions imposed by interocclusal splints: (i) intercuspal occlusion (IO), (ii) centric relation (CR), (iii) physiological side lateral occlusion and (iv) controlateral occlusion, in order to appreciate the impact of the splints upon orthostatism. Postural control and gaze stabilization quality decreased, from the best to the worst, with splints in CR, IO and lateral occlusion. In shooters, the improvement in postural control was parallel to superior shooting performance. A repercussion of dental occlusion upon proprioception and visual stabilization is suggested by these data.

Dental Occlusion↗
PubMed2005

Robust visualization of the dental occlusion by a double scan procedure.

A detailed visualization of the dental occlusion in 3D image-based planning environments for oral and maxillofacial planning is important. With CT imaging however, this occlusion is often deteriorated by streak artifacts caused by amalgam fillings. Moreover, more detailed surface information at the level of the dental cuspids is often desired. In this paper, a double scan technique is introduced to image the dental occlusion by means of a newly designed 3D splint. The patient wears this splint between the upper and lower teeth during CT-scan. In a second step, the splint is positioned between the plaster casts of the upper and lower jaw, and this setup is scanned. Based on markers in the 3D splint, both data sets are fused and a combined visualization is possible. The accuracy, robustness and applicability in clinical routine is shown. This technology enables meticulous 3D cephalometric analysis, detailed maxillofacial planning and opens possibilities towards intraoperative support.

Cadaver↗
PubMed1994

Skeletal and dental arch asymmetries in individuals with normal dental occlusions.

The aim of this study was to determine whether skeletal and/or dental asymmetries are presented in individuals with normal dental occlusions. Frontal cephalometric radiographs and dental arch casts were obtained from 20 Brazilians from Rio de Janeiro whose mean age was 22.4 years. Normal dental occlusions were present in all individuals. Nine bilateral triangles were established on the radiographs for the craniodentofacial complex. The area for each triangle was calculated, and the frequency of asymmetries on the dental casts was investigated. When comparing right and left sides on the radiographs, Student's tests did not show statistically significant differences in triangle areas, although the areas were not symmetrical. Males and females showed similar results when the areas of the radiographic triangles were compared between sexes. Maxillary and mandibular dental midlines, palatal raphe on the casts, and median sagittal plane on the radiographs were almost coincident. Additionally, the frequency of molar asymmetries on the dental casts was not statistically different, but molar asymmetries greater than 1 mm were present in 50% of the sample.

Adolescent↗
PubMed2005

Dental occlusion and body posture: no detectable correlation.

The present study was designed to determine if a correlation could be found between dental occlusion and body posture through posturography. Twenty-six healthy subjects (mean age 26.8+/-5.3 years) were monitored under opposing visual (eyes open/closed) and dental occlusion (mandibular rest/intercuspidation positions) conditions. The spatial (absolute displacement of centre of pressure from the theoretical point; ACOPD) and dynamic (sway area, length and velocity) posturographic parameters were recorded. Statistically significant differences were found among the experimental conditions for all of the variables except for ACOPD. Dynamic posturographic parameters were higher for eyes closed versus eyes open under both mandibular positions, although there were no differences between mandibular rest position and dental intercuspidation under the different visual conditions. This study thus shows no detectable correlation at the posturography level between dental occlusion and body posture.

Adult↗
PubMed2000

Relationship between dental occlusion and posture.

The purpose of this study is to show the effects of dental occlusion on postural position. Thirty subjects were divided into two groups: an experimental group who wore mandibular orthopedic repositioning appliances (MORA) and a control group who wore no oral device. All of the subjects underwent the same Fukuda-Unterberger experimental stepping test to check their postural attitude. Any deviation of the subject during the test from his initial position was analyzed. The results seemed to confirm that altering dental occlusion by wearing an oral appliance could induce some fluctuations in dynamic postural attitude. The phenomenon occurs after prolonged wearing of a MORA. Feedback effects are gradual after removing the mandibular splint.

Adult↗
PubMed1990

Epidemiologic panorama of dental occlusion.

The purpose of this study was to explore the possible significant sex difference in occlusion, provide information about the occlusal variation among Egyptians, and present an epidemiologic panorama of dental occlusion among different ethnic world populations. The hypothesis was that the occlusal variation is not independent of sex. A sample of 501 female and male adult subjects was studied. Normal occlusion, Angle's classification of malocclusion, and the Dewey-Anderson modifications for typifications were recorded. Chi-square tests were used. The results obtained from this study indicate that a significant sex difference in occlusion exists for normal occlusion, Angle Class I, and Angle Class III. Further, considering an anterior crossbite as the sole indicator of an Angle Class III malocclusion is erroneous; an anterior crossbite may exist in other classes, and Angle Class III type 1 (edge-to-edge) is more prevalent than either Class III type 2 (normal anterior overbite) or type 3 (anterior crossbite). Although numerically different, occlusal variation follows a universal general distributional pattern for most world populations. Some speculations are presented for clinical implications and for research suggestions.

Adolescent↗
PubMed1998

Relationship between dental occlusion and visual focusing.

The purpose of this study is to show the effects of dental occlusion on visual focusing. Thirty subjects were divided into two groups: an experimental group who had worn mandibular orthopedic repositioning appliances and a control group who had not worn any oral device. All of the subjects underwent the same visual focusing tests with a Maddox rod and the Berens prismatic bars, from over five meters to 30 centimeters. The results seemed to confirm that the alteration of dental occlusion can induce some fluctuations in visual focusing. The phenomenon occurs after wearing a MORA (Mandibular Orthopedic Repositioning Appliance) for a while. Feedback effects are gradual after removing the mandibular splint.

Adult↗
PubMed2005

Eight-year mortality associated with dental occlusion and denture use in community-dwelling elderly persons.

OBJECTIVE: To evaluate the influence of dental occlusion, with or without the use of dentures, on mortality in community-dwelling elderly persons. SUBJECTS: A total of 1030 randomly selected healthy independent elderly aged 65 and over were surveyed in 1995. For the study reported here, subjects were classified into three groups according to the presence or absence of maxillo-mandibular tooth contacts. Subjects with no maxillo-mandibular tooth contacts were further subdivided into those with and without dentures. METHODS: Data on mortality were obtained from Kure City Council in September 2003. Cox regression models were used in analysing the risk for death with gender and age as covariates. RESULTS: Individuals whose teeth had contact in at least the bilateral premolar regions at baseline had 0.78 times (95% CI: 0.60-0.99) smaller risk for death during the succeeding 8 years than those who had no occlusion. Among those who had no occlusion with their own teeth, the risk for mortality among denture non-users was 1.52 times (95% CI: 1.25-1.83) higher than the risk for denture users. CONCLUSION: These results may support the view that, in the elderly; poor dental occlusion is associated with an increased risk for mortality and that, in the edentulous, the use of dentures is associated with a decreased risk for mortality.

Age Factors↗
PubMed2004

[Dental occlusion and maxillofacial changes after correction of early crossbite with FR-III].

OBJECTIVE: To study the changes of the dental occlusion and the maxillofacial region after treatment with FR-III for crossbite in children in deciduous and mixed dentition phases. METHODS: Sixty-four children with crossbite in deciduous and mixed dentition phases were included in this study. Tooth models and Schuller's position and lateral head X-rays were measured before and after treatment with FR-III to study the changes in the three-dimensional structures of the dental occlusion and maxillofacial region. RESULT: The width of dental arch exhibited little changes after the treatment whereas the length of the maxillary dental arch was increased. The upper incisors grew in labial inclination and the condyle withdrew to its natural position. The relationship of maxillary and mandibular base bone was obviously improved after the treatment, which also promoted the lingual inclination of the lower incisiors and the decrease of the genial angle. The lower and posterior facial height was increased. CONCLUSION: FR-III readjusts the muscle function of oral and maxillofacial system and promotes normal development of the dental arch and jaw.

Activator Appliances↗
PubMed1992

A piezoelectric film transducer for dental occlusal analysis.

Occlusal load, contact sequence and location are necessary parameters for the study of dental biomechanics, simulation and clinical treatment planning. A piezoelectric film transducer for dental occlusal analysis was developed and in vitro evaluations of the transducer were conducted in a servohydraulically driven artificial mouth. The transducer is designed to provide occlusal contact force information. The transducer thickness (9 mum) minimizes interference with normal mandibular closure. Voltage outputs from the sensor as a result of occlusal contacts generated in the artificial mouth were sampled through a computer controlled data acquisition system. The transducer output recorded by the data acquisition system was calibrated to the applied load in the artificial mouth. The output of the piezoelectric film was evaluated during varying loads, cycling frequencies, surface areas of contact, and transducer surface areas. The preliminary studies indicate that the piezoelectric film holds out considerable promise and with further development may be well suited as a diagnostic tool in dental occlusal analysis.

Biomechanical Phenomena↗
PubMed1999

Prevalence of dental occlusal variables and intraarticular temporomandibular disorders: molar relationship, lateral guidance, and nonworking side contacts.

STATEMENT OF PROBLEM: The association between dental occlusion and the development of intraarticular temporomandibular disorders remains unclear. PURPOSE: This study evaluated the prevalence of molar relationship, lateral guidance and nonworking side contacts and intraarticular temporomandibular disorders. MATERIAL AND METHODS: Eighty-two asymptomatic volunteers and 263 symptomatic temporomandibular disorder (TMD) patients completed a subjective questionnaire that documented the absence of jaw pain, joint noise, locking, and a positive history for TMD. Participants also underwent clinical and dental examination for signs and symptoms commonly associated with TMD or internal derangements. RESULTS: The most prevalent molar relationship was Class I. Symptomatic patients had a higher prevalence of Class II, Division 1 relationships on the left side compared with the asymptomatic volunteers with normal joints. There was a higher prevalence of canine guidance (52.04%; P <.005) on the right side in the symptomatic patients with disk displacement (DD). Volunteers with normal joints had a higher prevalence of 1 or more nonworking side contacts compared with symptomatic patients with normal joints (P <.001) and symptomatic patients with DD (P <. 001). CONCLUSION: This study suggests there are no systematic dental occlusal differences that clearly separate symptomatic from asymptomatic patients. Results indicate that it is unclear as to the relationship of the 3 analyzed factors and of intraarticular TMDs.

Chi-Square Distribution↗
PubMed2000

[Orthognathic surgery and stereolithographic models. A new technic of dental occlusion transfer].

Use of stereolithographic models in orthognathic surgery is limited by the difficult in considering the facial osteotomies and the dental occlusion at the same time. Different techniques allow the surgeon to perform the simulation using composite prototypes after including the dental casts on the models. These techniques require complex "stereotaxic" systems or a surgical approach before CT scanning in order to insert the reference screws. They cannot overcome the problem of mandibular movement during the CT session. Our technique is a simple way to include the dental casts in the stereolithographic model with high precision. This can easily be done in a maxillo-facial environment and does not require any further special knowledge other than that which can be aquired in a classical dental laboratory. The occlusion transfer is achieved with a silicon cast of the teeth and the bony structures of the sterolithographic model on which we include the plaster dental casts. The silicone cast of the dental occlusion can also be used to decrease the mandibular movement during CT scanning.

Adult↗