Study of Gliding Tooth Contacts during Mastication

Suit, Stanley R.; Gibbs, Charles H.; Benz, Steven T.

doi:10.1902/jop.1976.47.6.331

Cited by 78 publications

(41 citation statements)

References 9 publications

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“…Suit and coworkers showed that the greater lateral movements were during the closing stroke, the greater was the probability that gliding contacts would occur. 34 Given the importance of tooth contact during mastication, 3 it is possible that a more lateral path of closure leads to more efficient chewing produced by increasing the time of gliding occlusal contacts. Differences in cycle shape between better and poorer performers were also evident in the anteroposterior plane, with poorer performers exhibiting greater posterior movements.…”

Section: Discussionmentioning

confidence: 99%

Masticatory Performance and Chewing Cycle Kinematics—Are They Related?

Lepley¹,

Throckmorton

Parker

et al. 2010

The Angle Orthodontist

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Objective: To compare chewing cycle kinematics of subjects with better and poorer masticatory performance. Materials and Methods: A cross-sectional study compared masticatory performance, based on the breakdown of the artificial test food CuttersilH, in 30 subjects with Class I occlusion. Individuals with median particle sizes greater and lesser than the median value for the entire sample were categorized as poorer (15) and better (15) performers, respectively. While chewing Cuttersil, threedimensional jaw movements of subjects were tracked with an optoelectric computer system. Multilevel linear modeling was used to evaluate differences in estimated cycle shape, cycle duration, and maximum excursions, as well as within-subject variation between the two groups. Results: Poorer performers had a significantly longer opening duration (0.274 6 0.225 sec vs 0.325 6 0.270 sec) than better performers. Poorer and better performers also showed significant differences in cycle shape, including a less horizontal path of closure and more posterior jaw movement in the poorer performers. In addition, poorer performers exhibited significantly more cycle-to-cycle (within-subject) variability in chewing cycle duration, excursive movements, and lateral velocity than did better performers. Conclusions: Poorer performers lacked consistency in their chewing cycles, and their cycle shape differs from that of better performers. (Angle Orthod. 2010;80:295-301.)

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Section: Discussionmentioning

confidence: 99%

Masticatory Performance and Chewing Cycle Kinematics—Are They Related?

Lepley¹,

Throckmorton

Parker

et al. 2010

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…However, Gibbs et al 9 found that occlusal forces during swallowing and mastication are only approximately 40 per cent of maximal bite force. Suit et al 10 reported that tooth contact occurs on average for only 194 milliseconds during mastication and for 683 milliseconds during swallowing. Considering that the duration and magnitude of forces during bruxism are much greater than those during functional activity, it is more likely that parafunction would result in such a process rather than function.…”

Section: The Development Of the Concept Of Abfractionmentioning

confidence: 99%

Abfraction: separating fact from fiction

Michael¹,

Townsend²,

Greenwood³

et al. 2009

Australian Dental Journal

144

114

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Non-carious cervical lesions involve loss of hard tissue and, in some instances, restorative material at the cervical third of the crown and subjacent root surface, through processes unrelated to caries. These non-carious processes may include abrasion, corrosion and possibly abfraction, acting alone or in combination. Abfraction is thought to take place when excessive cyclic, non-axial tooth loading leads to cusp flexure and stress concentration in the vulnerable cervical region of teeth. Such stress is then believed to directly or indirectly contribute to the loss of cervical tooth substance. This article critically reviews the literature for and against the concept of abfraction.Although there is theoretical evidence in support of abfraction, predominantly from finite element analysis studies, caution is advised when interpreting results of these studies because of their limitations. In fact, there is only a small amount of experimental evidence for abfraction. Clinical studies have shown associations between abfraction lesions, bruxism and occlusal factors, such as premature contacts and wear facets, but these investigations do not confirm causal relationships. Importantly, abfraction lesions have not been reported in pre-contemporary populations.It is important that oral health professionals understand that abfraction is still a theoretical concept, as it is not backed up by appropriate clinical evidence. It is recommended that destructive, irreversible treatments aimed at treating so-called abfraction lesions, such as occlusal adjustment, be avoided.

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“…Since tooth gliding contacts during the closing phase has an important role in the characteristic of the chewing cycle, 9,19 we selected the pathway when the reference point was positioned 0.5 mm below the intercuspal position on which tooth gliding contacts might occur for all subjects (Fig 4). As for the condylar point, the length of the condylar trajectory and the maximum velocity of condylar movement during the EMG bursts were calculated.…”

Section: Measurement Of the Mandibular Movementmentioning

confidence: 99%

“…Wilding 7 and Ikebe et al 8 also emphasized the association between occlusal contacts and masticatory performance. Moreover, Suit et al 9 described the importance of tooth guidance during mastication and Yamashita et al 10 concluded in their review article that tooth anatomy played an important role in the direction of jaw movement during mastication.…”

Section: Introductionmentioning

confidence: 99%

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Influence of changing the chewing region on mandibular movement

Hashii¹,

Tomida²,

Yamashita³

2009

Australian Dental Journal

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Background: In the shortened dental arch condition, little is known of how patients adapt their jaw function during mastication to the new oral environment. This study aimed to investigate the changes in mandibular movements when the chewing region was changed from the first molar to the first premolar. Methods: Thirty clinical residents with natural dentitions were recruited. The subjects were asked to chew a piece of beef jerky using either the first molar or the first premolar on the preferred chewing side. Three-dimensional trajectories of lower incisors and both condyles were analysed using a jaw movement tracking device with six degrees of freedom during the period between the onset and offset of electromyographic bursts from the masseter and anterior temporal muscles. Results: The closing angle of the lower incisors for first premolar chewing was narrower in comparison with that for first molar chewing (p < 0.05). The lengths of the condylar trajectories and the maximum velocities of the condylar movement for first premolar chewing were smaller and slower, respectively, in comparison with those for first molar chewing (both sides; p < 0.01). Conclusions: The mandibular movement during mastication might be changed to adapt the premolar chewing because of a loss of posterior occlusal supports.

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Study of Gliding Tooth Contacts during Mastication

Cited by 78 publications

References 9 publications

Masticatory Performance and Chewing Cycle Kinematics—Are They Related?

Masticatory Performance and Chewing Cycle Kinematics—Are They Related?

Abfraction: separating fact from fiction

Influence of changing the chewing region on mandibular movement

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