Abstract
This study analysed how bolus hardness and size affect within-subject variability of chewing cycle kinematics. Two independent prospective studies were performed; both tracked chin movements using an optoelectronic recording system. Computer programs identified each subject's ten most representative cycles, and multilevel modelling procedures were used to estimate variances. One study evaluated 38 subjects who chewed 1, 2, 4 or 8 g of gum presented in random order. The second study evaluated 26 subjects who chewed approximately 2.5 g of harder (670 g) or softer (440 g) gum, also presented in random order. In terms of bolus size, the 2 g and 1 g boluses produced the least and greatest relative within-subject variability, respectively; the largest differences were found for cycle duration and excursions. Within-subject variability when chewing the harder gum was consistently greater than when chewing the softer gum, except for lateral movement towards the balancing side. Because bolus hardness and bolus size influence within-subject variability differently, they must be taken into consideration when designing experiments to study masticatory kinematics. We conclude that a 2 g bolus of soft gum should be used in studies of chewing cycle kinematics in order to reduce within-subject variability and increase statistical power.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 369-375 |
| Number of pages | 7 |
| Journal | Archives of Oral Biology |
| Volume | 53 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2008 |
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Keywords
- Bolus hardness
- Bolus size
- Chewing cycle kinematics
- Human
- Mastication
- Within-subject variability
ASJC Scopus subject areas
- Dentistry(all)
Cite this
Effects of bolus size and hardness on within-subject variability of chewing cycle kinematics. / Wintergerst, Ana M.; Throckmorton, Gaylord S.; Buschang, Peter H.
In: Archives of Oral Biology, Vol. 53, No. 4, 04.2008, p. 369-375.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of bolus size and hardness on within-subject variability of chewing cycle kinematics
AU - Wintergerst, Ana M.
AU - Throckmorton, Gaylord S.
AU - Buschang, Peter H.
PY - 2008/4
Y1 - 2008/4
N2 - This study analysed how bolus hardness and size affect within-subject variability of chewing cycle kinematics. Two independent prospective studies were performed; both tracked chin movements using an optoelectronic recording system. Computer programs identified each subject's ten most representative cycles, and multilevel modelling procedures were used to estimate variances. One study evaluated 38 subjects who chewed 1, 2, 4 or 8 g of gum presented in random order. The second study evaluated 26 subjects who chewed approximately 2.5 g of harder (670 g) or softer (440 g) gum, also presented in random order. In terms of bolus size, the 2 g and 1 g boluses produced the least and greatest relative within-subject variability, respectively; the largest differences were found for cycle duration and excursions. Within-subject variability when chewing the harder gum was consistently greater than when chewing the softer gum, except for lateral movement towards the balancing side. Because bolus hardness and bolus size influence within-subject variability differently, they must be taken into consideration when designing experiments to study masticatory kinematics. We conclude that a 2 g bolus of soft gum should be used in studies of chewing cycle kinematics in order to reduce within-subject variability and increase statistical power.
AB - This study analysed how bolus hardness and size affect within-subject variability of chewing cycle kinematics. Two independent prospective studies were performed; both tracked chin movements using an optoelectronic recording system. Computer programs identified each subject's ten most representative cycles, and multilevel modelling procedures were used to estimate variances. One study evaluated 38 subjects who chewed 1, 2, 4 or 8 g of gum presented in random order. The second study evaluated 26 subjects who chewed approximately 2.5 g of harder (670 g) or softer (440 g) gum, also presented in random order. In terms of bolus size, the 2 g and 1 g boluses produced the least and greatest relative within-subject variability, respectively; the largest differences were found for cycle duration and excursions. Within-subject variability when chewing the harder gum was consistently greater than when chewing the softer gum, except for lateral movement towards the balancing side. Because bolus hardness and bolus size influence within-subject variability differently, they must be taken into consideration when designing experiments to study masticatory kinematics. We conclude that a 2 g bolus of soft gum should be used in studies of chewing cycle kinematics in order to reduce within-subject variability and increase statistical power.
KW - Bolus hardness
KW - Bolus size
KW - Chewing cycle kinematics
KW - Human
KW - Mastication
KW - Within-subject variability
UR - http://www.scopus.com/inward/record.url?scp=39749160624&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=39749160624&partnerID=8YFLogxK
U2 - 10.1016/j.archoralbio.2007.10.012
DO - 10.1016/j.archoralbio.2007.10.012
M3 - Article
C2 - 18093571
AN - SCOPUS:39749160624
VL - 53
SP - 369
EP - 375
JO - Archives of Oral Biology
JF - Archives of Oral Biology
SN - 0003-9969
IS - 4
ER -