A comment on: The instantaneous center of rotation during human jaw opening and its significance in interpreting the functional meaning of condylar translation (Chen, x., 1998, Am J Phys Anthropol 106:35-46.)

✍ Scribed by Wall, Christine E.; Hylander, William L.

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 75 KB
• Volume: 110
• Category: Article
• ISSN: 0002-9483
• DOI: 10.1002/(sici)1096-8644(199909)110:1<105::aid-ajpa9>3.0.co;2-6

✦ Synopsis

Chen (1998) recently published the results of a study in which he recorded movement of the mandible during jaw opening in seven human subjects. From these data, Chen (1998) claims to have determined the location of the instantaneous center of rotation (ICR) of the human mandible using a two-dimensional algorithm for ICR determination (Crisco et al., 1994).

Chen's (1998) study suffers from several methodological problems, and most likely resulted in an incorrect location for the ICR. This paper discusses three significant shortcomings of Chen's (1998) analysis that concern the method of determining the location of the ICR. We conclude with a discussion of the mechanical implication of Chen's (1998) determination of the ICR.