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This study investigated the differences of weight distribution on the sole of the feet in the primary and the early permanent dentition by the modifying Morton staticometer. The distribution of body weight in the outer forward part on soles of feet in the permanent dentition group was significantly greater than that in the primary dentition group. The distribution of body weight in the heel on soles of feet in the permanent dentition group was significantly smaller than that in the primary dentition group. These results indicated that the weight was shifted from the heels to the forefeet from primary to permanent dentition.
OBJECTIVE:
The aim of this study was to evaluate the influence of different jaw relationships on the plantar arch during gait.
METHODS:
168 subjects, participating in this study, were distributed into two groups: a control (32 males and 52 females, ranging from 18 to 36 years of age) and a Temporomandibular joint disorders group (28 males and 56 females, ranging from 19 to 42 years of age). Five baropodometric variables were evaluated using a baropodometric platform: the mean load pressure on the plantar surface, the total surface of feet, forefoot vs rearfoot loading, forefoot vs rearfoot surface, and the percentage of body weight on each limb. The tests were performed in three dental occlusion conditions: mandibular rest position (REST); voluntary teeth clenching (VTC); and cotton rolls placed between the upper and the lower dental arches without clenching (CR). The variables were analyzed through repeated measures ANOVA. The Mann-Whitney test was used to compare the postural parameters of the two groups. The level of significance was p < 0.05.
RESULTS:
As to the intra-group analysis of TMD group, all posturographic parameters in both lower limbs showed a significant difference between REST vs CR (P < 0.001) and between VTC vs CR (p < 0.001), except for the percentage of body weight on each limb. The control group showed a significant difference between REST vs VTC, REST vs CR and VTC vs CR (p < 0.001) in the mean load pressure on the plantar arch, forefoot surface, rearfoot surface and total surface of feet. The mean load pressure on the plantar arch in VTC, and the forefoot and total surfaces of feet in CR (p < 0.05) were significantly higher in the TMD group in both limbs. The results of this study indicate that there are differences in the plantar arch between the TMD group and control group and that, in each group, the condition of voluntary tooth clenching determines a load reduction and an increase in surface on both feet, while the inverse situation occurs with cotton rolls. The results also suggest that a change in the load distribution between forefoot and backfoot when cotton rolls were placed between the dental arches can be considered as a possible indicator of a pathological condition of the stomatognathic system (SS) which could influence posture. Therefore the use of posture monitoring systems during the treatment of stomatognathic system is justified.
Dentition impacts the feet as well as feet impacting the dentition. We (posturologists) refer to the former as Descending Patterns and the latter as Ascending Patterns. Cuccia's paper suggests this correlation that posturologists in Europe have been writing about for years.
If you accept the Neurophysiological Model as an explanation as to how the Ascending Patterns can result in postural distortions (Rothbart, Podiatry Revew July/Aug 2011), then you might anticipate a reciprocal relationship between the jaw and the feet. All interesting possibilities. Might make a good thread of discussion.
I really don't want to get into this again. But this
Quote:
This study investigated the differences of weight distribution on the sole of the feet in the primary and the early permanent dentition by the modifying Morton staticometer. The distribution of body weight in the outer forward part on soles of feet in the permanent dentition group was significantly greater than that in the primary dentition group. The distribution of body weight in the heel on soles of feet in the permanent dentition group was significantly smaller than that in the primary dentition group. These results indicated that the weight was shifted from the heels to the forefeet from primary to permanent dentition.
Is a contender for the most egregious debasement of science I have ever read. Seriously.
So the study finds that between little tiny kiddies (baby teeth) and older children (grown up teeth) there is more weight on the forefoot with the older ones... and the inference is that this difference is because of the teeth.
Because of course nothing else changes between 5 years old and 15 years old.
What you really need is a pipe to compensate for any asymmetrical clenching of the dentition, that'll sort your plantar pressures out. Just thought of a great study, plantar pressures in pipe smokers..... sub-genius.
Wow, then you can do a study on the incidence of ulcer positioning in pipe smokers with periph. vasc. disease and non-evenly distributed plantar pressures! Of course with the teeth/butt clenching control group ;D
Effects of experimental leg length discrepancies on body posture and dental occlusion.
Maeda N, Sakaguchi K, Mehta NR, Abdallah EF, Forgione AG, Yokoyama A. Cranio. 2011 Jul;29(3):194-203.
Quote:
The purpose of this study was to quantitatively evaluate the effects of experimental leg length discrepancies on body posture and dental occlusion. Thirty asymptomatic subjects (15 males and 15 females, ages 19-33, mean age 25.6 years) were included in this study and randomly assigned to one of two groups based on a table of random numbers. The only difference between group A and group B was the sequence of testing. Experimental leg length discrepancies were provided by using ten types of insoles with heights ranging from one to ten mm at one mm intervals, placed under both feet. The MatScan (Nitta Corp., Osaka, Japan) system was used to measure changes in body posture (center of foot pressure: COP) while subjects maintained the following three postural positions: 1. natural standing posture (control); 2. control with a heel lift under the right foot; or 3. control with a heel lift under the left foot. The T-Scan II system (Nitta Corp., Osaka, Japan) was used to analyze the results of changes in dental occlusion (center of occlusal force: COF) in the above-mentioned three postural positions. When subjects used a heel lift of six mm or more under the right foot, lateral weight distribution (LWD) shifted to the right side compared to the control (p<0.05). When a heel lift of four mm or more was used under the left foot, LWD shifted to the left side compared to the control (p<0.05). When subjects used a heel lift of eight mm or more under the right foot, occlusal force shifted to the right side compared to the control (p<0.05). When subjects used a heel lift of seven mm or more under the left foot, occlusal force shifted to the left side compared to the control (p<0.05). Based on these findings, it was concluded that leg length discrepancy affected body posture and dental occlusion.
Evaluation of the correlation between dental occlusion and posture using a force platform.
Baldini A, Nota A, Tripodi D, Longoni S, Cozza P. Clinics (Sao Paulo). 2013 Jan;68(1):45-49.
Quote:
OBJECTIVES:
Force platforms are widely used to evaluate the relationship between posture and dental occlusion. This study evaluated whether force platforms are able to detect eventual postural modifications resulting from dental occlusion.
METHOD:
A total of 44 healthy volunteers who were given no information on the aim of the study underwent six postural stabilometric exams under different mandibular and visual conditions. Four parameters were considered: sway area, sway velocity, X axis displacement of the center of the foot pressure and Y axis displacement of the center of the foot pressure.
RESULTS:
An analysis of variance (ANOVA) revealed the relative influence of each factor; specifically, the ocular afference significantly influenced the sway area and sway velocity parameters, and the mandibular position had only aweakinfluence on theswayareaparameter.
CONCLUSIONS:
Vision was shown to influence body posture, and a weak correlation was observed between mandibular position and body posture in healthy subjects. However, the force platform is most likely not able to clearly detect this relationship. Gnathologists must use caution when using force platform analysis to modify a therapeutic plan. The sway area seems to be the most sensitive parameter for evaluating the effect of occlusion on body posture.
Dentition and foot weightbearing
Hybrid Mode
