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Observational Study
. 2014 Apr;80(2):138-45.
doi: 10.5935/1808-8694.20140029.

Amplitude and speed of masticatory movements in total laryngectomy patients

[Article in English, Portuguese]
Paulo Fernandes Pinheiro Junior  1 , Lucas Carvalho Aragão Albuquerque  2 , Cicilia Lais de Lima Silva  3 , Natália Freira da Silva  3 , Daniele Andrade da Cunha  3 , Hilton Justino da Silva  3
Affiliations
Observational Study

Amplitude and speed of masticatory movements in total laryngectomy patients

[Article in English, Portuguese]
Paulo Fernandes Pinheiro Junior et al. Braz J Otorhinolaryngol. 2014 Apr.

Abstract

Introduction: Laryngectomy is a surgical procedure that aims to remove the hyoid bone and the larynx and its muscles; it is inferred that a destabilization of the hyoid-mandibular axis will occur, consequently changing chewing.

Objective: To characterize the amplitude and speed of chewing in laryngectomies and to compare them with two groups of non-laryngectomized individuals differentiated by age.

Method: 72 volunteers were divided into three groups: (A) 32 volunteers, mean age 22.3 years, 17 females; (B) 20 volunteers, mean age 53.2 years, 10 females, and (C) 20 volunteers who underwent total laryngectomy, mean age 61.5 years, one female. Electrognathography, a method that tracks and measures millimeter jaw movements, was used for evaluation.

Results: Significant differences were observed between groups A and C in masticatory amplitude and speed.

Conclusion: Age, and adaptive and compensatory changes appear to explain chewing better than factors related to total laryngectomy.

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Figures

Figure 1
Figure 1
Vert, total count of the number of cycles. Lat, number of masticatory cycles to the right and left, and A/P, number of protrusions and retrusions.
Figure 2
Figure 2
Velocity graph presents the maximum opening (the O side of the graph) and closing (C side of the graph) speeds. Sagittal graph presents the maximum protrusion (A side of the graph) and retraction (P side of the graph). Frontal graph presents the maximum opening amplitude. Horizontal graph presents the maximum right laterality (right side of graph) and maximum left laterality (left side of graph).
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