Hala AL-Abbasi, B.D.S., M.S., D.Sc.; Noshir R. Mehta, D.M.D., M.D.S., M.S.; Albert G. Forgione, Ph.D.; R. Ernest Clark, Ph.D.; The Effect of Vertical Dimension and Mandibular Position on Isometric Strength of the Cervical Flexors. THE JOURNAL OF CRANIOMANDIBULAR PRACTICE APRIL 1999, VOL. 17, NO. 2, pp. 85-92.
ABSTRACT:
This study compared the peak isometric strength of the cervical flexors in deep bite temporomandibular dysfunction (TMD) patients while biting in four bite positions: habitual occlusion, edgeto-edge, lateral shift and retruded. These values were then compared to those of the same subjects’ bite positions elevated to a functional criterion (maximum isometric strength of the deltoid muscles). The mean height increase was 2.4 mm with a range of 1.5-3.8 mm. Fifteen of eighteen deep bite subjects met an inclusionary criterion, at least 13.3 Newtons (N) stronger cervical muscle strength with mandible relaxed open than habitual bite. Peak strength biting edge-to-edge was significantly greater than biting in habitual occlusion. Strength was found to increase significantly when biting in each of four mandibular
positions when the bite was elevated to the functional criterion. The greatest strength was obtained from elevated habitual and edge-to-edge positions. The findings are of clinical significance, suggesting that cervical muscle isometric strength is affected by bite position and vertical dimension of occlusion. The results suggest that when biting, individuals with deep bite may be functioning at about 60% of their
potential cervical flexor, isometric strength. The interaction between occlusal position, vertical dimension and cervical muscle function suggests a craniomandibular-cervical masticatory system.
Showing posts with label Deep Bite. Show all posts
Showing posts with label Deep Bite. Show all posts
Sunday, August 22, 2010
Examination of the Relationship Between Mandibular Position and Body Posture
Kiwamu Sakaguchi, D.D.S., Ph.D.; Noshir R. Mehta, D.M.D., M.D.S., M.S.; Emad F. Abdallah, D.M.D., M.S.; Albert G. Forgione, Ph.D.; Hiroshi Hirayama, D.D.S., D.M.D., M.S.; Takao Kawasaki, D.D.S., Ph.D.; Atsuro Yokoyama, D.D.S., Ph.D.; Examination of the Relationship Between Mandibular. The Journal of Craniomandibular Practice, October 2007, Vol. 25, No. 4. pp. 237-249.
ABSTRACT:
The purpose of this study was to evaluate the effect of changing mandibular position on body posture and reciprocally, body posture on mandibular position. Forty-five (45) asymptomatic subjects (24 males and 21 females, ages 21-53 years, mean age 30.7 years) were included in this study and randomly assigned to one of two groups, based on the table of random numbers. The only difference between group I and group II was the sequence of the testing. The MatScan (Tekscan, Inc., South Boston, MA) system was used to measure the result of changes in body posture (center of foot pressure: COP) while subjects maintained the following 5 mandibular positions: 1) rest position, 2) centric occlusion, 3) clinically midlined jaw position with the labial frena aligned, 4) a placebo wax appliance, worn
around the labial surfaces of the teeth and 5) right eccentric mandibular position. The T-Scan II (Tekscan, Inc., South Boston, MA) system was used to analyze occlusal force distribution in two postural positions, with and without a heel lift under the right foot. Total trajectory length of COP in centric occlusion was shorter than in the rest position (p<0.05). COP area in right eccentric mandibular position was larger than in centric occlusion (p<0.05). When subjects used a heel lift under the right foot, occlusal forces shifted to the right side compared to no heel lift (p<0.01). Based on these findings, it was concluded that changing mandibular position affected body posture. Conversely, changing body posture affected mandibular position.
ABSTRACT:
The purpose of this study was to evaluate the effect of changing mandibular position on body posture and reciprocally, body posture on mandibular position. Forty-five (45) asymptomatic subjects (24 males and 21 females, ages 21-53 years, mean age 30.7 years) were included in this study and randomly assigned to one of two groups, based on the table of random numbers. The only difference between group I and group II was the sequence of the testing. The MatScan (Tekscan, Inc., South Boston, MA) system was used to measure the result of changes in body posture (center of foot pressure: COP) while subjects maintained the following 5 mandibular positions: 1) rest position, 2) centric occlusion, 3) clinically midlined jaw position with the labial frena aligned, 4) a placebo wax appliance, worn
around the labial surfaces of the teeth and 5) right eccentric mandibular position. The T-Scan II (Tekscan, Inc., South Boston, MA) system was used to analyze occlusal force distribution in two postural positions, with and without a heel lift under the right foot. Total trajectory length of COP in centric occlusion was shorter than in the rest position (p<0.05). COP area in right eccentric mandibular position was larger than in centric occlusion (p<0.05). When subjects used a heel lift under the right foot, occlusal forces shifted to the right side compared to no heel lift (p<0.01). Based on these findings, it was concluded that changing mandibular position affected body posture. Conversely, changing body posture affected mandibular position.
Effects of different jaw relations on postural stability in human subjects
P. Bracco, A. Deregibus*, R. Piscetta: Biomedical Sciences and Human Oncology Department, University of Torino, C.so Dogliotti 14, I-10126 Torino, Italy, Received 22 August 2003; received in revised form 24 November 2003; accepted 27 November 2003
Abstract:
Authors investigated the effects of different jaws relations on body posture in a sample of 95 subjects. All subjects underwent a
posturometric and stabilometric analysis using a computerized footboard. Tests were performed in three mandibular positions: centric
occlusion, rest position and myocentric position, respectively determined by teeth engagement, joints position, and muscles contraction. All subjects showed variations of body posture in the different mandibular positions. Statistical analysis (analysis of variance for repeated
measures) confirmed that postural variations in different jaws relations were significant: in particular, the SKN multiple comparison test
showed that myocentric position improved postural balance on frontal plane with respect to the other jaw positions considered.
Abstract:
Authors investigated the effects of different jaws relations on body posture in a sample of 95 subjects. All subjects underwent a
posturometric and stabilometric analysis using a computerized footboard. Tests were performed in three mandibular positions: centric
occlusion, rest position and myocentric position, respectively determined by teeth engagement, joints position, and muscles contraction. All subjects showed variations of body posture in the different mandibular positions. Statistical analysis (analysis of variance for repeated
measures) confirmed that postural variations in different jaws relations were significant: in particular, the SKN multiple comparison test
showed that myocentric position improved postural balance on frontal plane with respect to the other jaw positions considered.
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