PMID- 17695999 OWN - NLM STAT- MEDLINE DCOM- 20070917 LR - 20070816 IS - 0940-9602 (Print) IS - 0940-9602 (Linking) VI - 189 IP - 4 DP - 2007 TI - Dimeric link chain and instantaneous centers of rotation of the mandible. PG - 390-2 AB - The primary aim of the study was to reveal whether the free opening movement of the mandible can be determined by only 2 rotational axes as suggested in recent literature. For this purpose, the free opening movement of the mandible was registered in 20 asymptomatic patients using an ultrasonic measuring system. Subsequently, the locations of the instantaneous centers of rotation (ICR) were determined directly from the raw data. In a second approach, the same data were used to construct a mandibular and maxillar rotational axis according to the dimeric link chain (DLC) concept. On the basis of the angular velocities around these 2 axes, the positions of the ICR were calculated in the sagittal-vertical plane. Calculating the ICR by the DLC method provides similar results to that of the conventional approaches. It can be concluded that the DLC method is a valid approach and that considering the planar mandibular movement as a movement with 2 degrees of freedom is justified. FAU - Sadat-Khonsari, Reza AU - Sadat-Khonsari R AD - Department of Orthodontics, Georg-August-University of Gottingen, Robert-Koch-Strasse 40, D-37099 Gottingen, Germany. reza.khonsari@med.uni-goettingen.de FAU - Hahn, Wolfram AU - Hahn W FAU - Knosel, Michael AU - Knosel M FAU - Thieme, Kirsten M AU - Thieme KM FAU - Nagerl, Hans AU - Nagerl H FAU - Kubein-Meesenburg, Dietmar AU - Kubein-Meesenburg D LA - eng PT - Journal Article PL - Germany TA - Ann Anat JT - Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft JID - 100963897 SB - IM MH - Humans MH - Mandible/*anatomy & histology/*physiology MH - Models, Biological MH - Movement MH - Rotation EDAT- 2007/08/19 09:00 MHDA- 2007/09/18 09:00 CRDT- 2007/08/19 09:00 PHST- 2007/08/19 09:00 [pubmed] PHST- 2007/09/18 09:00 [medline] PHST- 2007/08/19 09:00 [entrez] AID - S0940-9602(07)00052-0 [pii] AID - 10.1016/j.aanat.2007.02.013 [doi] PST - ppublish SO - Ann Anat. 2007;189(4):390-2. doi: 10.1016/j.aanat.2007.02.013.