Longitudinal observation of basic mandibular movements: report of a case

Sound development of mandibular function during childhood is indispensable to establishing healthy function in adults. To examine this developmental process, longitudinal recordings of basic mandibular movements were done using an optoelectronic analysis. Mandibular movements were recorded on five separate occasions in one boy, from an age of six years and five months to 14 years and five months. The incisor pathways during protrusion and lateral excursion were initially shallow, with more anterior than inferior movement, but as he grew the amount of inferior movement and the amount of rotation both increased. Similarly, at his first recording there was very little hinge-like rotation during mouth closing, but rotation increased markedly after eruption of his permanent second molars. These findings suggest that mandibular movements change from being relatively simple with more translation in younger children to more complex movements with more rotation once the permanent dentition is established.

1. Baume L. Physiological tooth migration and its significance for the development of occlusion. 1. The biogenetic course of the deciduous dentition. J Dent Res 29: 123-132, 1953.

2. Sillman J. Serial study of good occlusion from birth to 12 years of age. Angle Orthodontist 37: 481-507, 1951.

3. Sillman J. Dimensional changes of dental arches: Longitudinal study from birth to 25 years. Am J Orthodont 50: 824-841, 1964.

4. Ingervall B. Range of movement of mandible in children. Scand J Dent Res 78: 311-22, 1970.

5. Ingervall B. Range of sagittal movement of the mandibular condyles and inclination of the condyle path in children and adults. Acta Odont Scand 30: 67-87, 1972.

6. Wickwire NA, Gibbs CH, Jacobson AP et al. Chewing patterns in normal children. Angle Orthodont 51: 48-60, 1981.

7. Hayasaki H, Yamasaki Y, Nishijima N et al. Characteristics of protrusive and lateral excursions of the mandible in children with the primary dentition. J Oral Rehab 25: 311-20, 1998.

8. Nishijima N, Hayasaki H, Okamoto A et al. Difference in tracks between habitual open and close mandibular move-ments at the condyle in children. J Oral Rehab 27: 999-1003, 2000.

9. Yamasaki Y, Hayasaki H, Ogata T et al.The relationship between incisal overlap and direction of mandibular excursions in children with primary dentition. Pediatr Dent J 2: 15-21, 1992.

10. Okamoto A, Hayasaki H, Nishijima N et al. Occlusal contacts during lateral excursions in children with primary dentition. J Dent Res 79: 1890-1895, 2000.

11. Gibbs CH, Wickwire NA, Jacobson AP et al. Comparison of typical chewing patterns in normal children and adults. JADA 105: 33-42, 1982.

12. Bennet N. A contribution to the study of the movements of the mandible. J Prosth Dent 8: 41-54, 1958.

13. Hochman N, Ehrlich J, Yaffe A. Tooth contact during dynamic lateral excursion in young adults. J Oral Rehab 22: 221-224, 1995.

14. Carlson DS. Growth of the temporomandibular joint. Copenhagen: Munksgaard, 1994.

15. Kohno S. A study on condylar movements with reference to the mandibular movements in sagittal plane: Analysis of sagittal axis with the multiple electronic flush apparatus. J Japan Prosthodont Soc 12: 350-380, 1968.