Aim. To determine whether a relationship exists between the linear measurements of overjet and overbite and the interincisal space delimited by the morphology of the upper and lower incisors. Method and Materials. 30 subjects (age range from 14.1 to 34.8 years, with a median age of 23.5 years and sex ratio F/M: 5/10) with overjet and overbite equal to 2？mm were selected from a group of 381 individuals with a full and well-aligned dentition, no previous dental treatment, and no signs or symptoms indicative of temporomandibular disorder. Computed Tomography images of vinyl polysiloxane impressions of the 30 subjects’ anterior teeth were acquired. The interincisal space was defined as Immediate Overjet Angle and was calculated on the Computed Tomography images. Results. Although the 30 subjects presented overlapping measures of overjet and overbite, the values of the Immediate Overjet Angles were different in a range of a minimum value of 12° and a maximum value of 54°. Conclusion. This study reveals that (1) only 30 (7.9%) of the 381 individuals considered have values of overjet and overbite equal to 2？mm and (2) the Immediate Overjet Angle values of the 30 subjects are not related to the values of overjet and overbite. 1. Introduction The cyclic pattern of masticatory movements is regulated by a continuous interaction between [1] (i)peripheral inputs generated by the mastication muscles, the temporomandibular joint, and the occlusion, (ii)central nervous system. Several individual occlusal factors, which affect masticatory function influencing the cyclic pattern of masticatory movements, are described in the literature: the presence or absence of dental restorations [2], the overbite (OB) [3], the overjet (OJ) [4], the inclination of the occlusal plane [5–8], the occlusal guidance [9–13], and occlusal interferences [14–16]. Many studies show that the pattern of masticatory movements reflects the individual pattern of the occlusal guidance [9–13]. Shupe et al. [17] highlighted the relationship between the anterior guidance and muscle activity. Jemt et al. [18], Ehrlich et al. [19], and Yamashita et al. [20] confirmed the influence of the upper teeth lingual morphology and inclination on muscle activity and the chewing cycle. Kimoto et al. [21] demonstrated the role of the occlusal guidance, which is strictly dependent on the occlusal morphology, as a factor which influences the masticatory function and thus the activity of masticatory muscles. Ogawa et al. [8] added that the inclination of the occlusal guidance affects the masticatory function near the
References
[1]
T. Ogawa, M. Ogawa, and K. Koyano, “Different responses of masticatory movements after alteration of occlusal guidance related to individual movement pattern,” Journal of Oral Rehabilitation, vol. 28, no. 9, pp. 830–841, 2001.
[2]
S. Karlsson, M. Persson, and G. E. Carlsson, “Mandibular movement and velocity in relation to state of dentition and age,” Journal of Oral Rehabilitation, vol. 18, no. 1, pp. 1–8, 1991.
[3]
B. C. Cooper and I. Kleinberg, “Examination of a large patient population for the presence of symptoms and signs of temporomandibular disorders,” Cranio, vol. 25, no. 2, pp. 114–126, 2007.
[4]
J. W. Stockstill, J. F. Bowley, D. Dunning, P. Spalding, K. Stafford, and L. Erickson, “Prevalence of temporomandibular disorders (TMD) in children based on physical signs,” Journal of Dentistry for Children, vol. 65, no. 6, pp. 459–467, 1998.
[5]
T. Ogawa, K. Koyano, and T. Suetsugu, “The relationship between inclination of the occlusal plane and jaw closing path,” Journal of Prosthetic Dentistry, vol. 76, no. 6, pp. 576–580, 1996.
[6]
T. Ogawa, K. Koyano, and T. Suetsugu, “Characteristics of masticatory movement in relation to inclination of occlusal plane,” Journal of Oral Rehabilitation, vol. 24, no. 9, pp. 652–657, 1997.
[7]
T. Ogawa, K. Koyano, and T. Suetsugu, “Correlation between inclination of occlusal plane and masticatory movement,” Journal of Dentistry, vol. 26, no. 2, pp. 105–112, 1998.
[8]
T. Ogawa, K. Koyano, and G. Umemoto, “Inclination of the occlusal plane and occlusal guidance as contributing factors in mastication,” Journal of Dentistry, vol. 26, no. 8, pp. 641–647, 1998.
[9]
U. C. Belser and A. G. Hannam, “The influence of altered working-side occlusal guidance on masticatory muscles and related jaw movement,” The Journal of Prosthetic Dentistry, vol. 53, no. 3, pp. 406–413, 1985.
[10]
C. H. Gibbs and H. C. Lundeen, “Jaw movements and forces during chewing and swallowing and their clinical significance,” in Advances in Occlusion, H. C. Lindeen and C. H. Gibbs, Eds., pp. 2–32, John Wright, Boston, Mass, USA, 1982.
[11]
J.-Y. Koak, K.-N. Kim, and S.-J. Heo, “A study on the mandibular movement of anterior openbite patients,” Journal of Oral Rehabilitation, vol. 27, no. 9, pp. 817–822, 2000.
[12]
S. R. Suit, C. H. Gibbs, and S. T. Benz, “Study of gliding tooth contacts during mastication,” Journal of Periodontology, vol. 47, no. 6, pp. 331–334, 1976.
[13]
A. Woda, P. Vigneron, and D. Kay, “Nonfunctional and functional occlusal contacts: a review of the literature,” The Journal of Prosthetic Dentistry, vol. 42, no. 3, pp. 335–341, 1979.
[14]
A. G. Hannam, W. W. Wood, R. E. De Cou, and J. D. Scott, “The effects of working-side occlusal interferences on muscle activity and associated jaw movements in man,” Archives of Oral Biology, vol. 26, no. 5, pp. 387–392, 1981.
[15]
S. Karlsson, S. A. Cho, and G. E. Carlsson, “Changes in mandibular masticatory movements after insertion of nonworking-side interference,” Journal of Craniomandibular Disorders, vol. 6, no. 3, pp. 177–183, 1992.
[16]
Y. Y. Shiau and J. Z. Syu, “Effect of working side interferences on mandibular movement in bruxers and non-bruxers,” Journal of Oral Rehabilitation, vol. 22, no. 2, pp. 145–151, 1995.
[17]
R. J. Shupe, S. E. Mohamed, L. V. Christensen, I. M. Finger, and R. Weinberg, “Effects of occlusal guidance on jaw muscle activity,” The Journal of Prosthetic Dentistry, vol. 51, no. 6, pp. 811–818, 1984.
[18]
T. Jemt, S. Lundquist, and B. Hedegard, “Group function or canine protection,” The Journal of Prosthetic Dentistry, vol. 48, no. 6, pp. 719–724, 1982.
[19]
J. Ehrlich, N. Hochman, and A. Yaffe, “The masticatory pattern as an adjunct for diagnosis and treatment,” Journal of Oral Rehabilitation, vol. 19, no. 4, pp. 393–398, 1992.
[20]
S. Yamashita, J. P. Hatch, and J. D. Rugh, “Does chewing performance depend upon a specific masticatory pattern?” Journal of Oral Rehabilitation, vol. 26, no. 7, pp. 547–553, 1999.
[21]
K. Kimoto, K. Tamaki, T. Yoshino, M. Toyoda, and A. G. ？elar, “Correlation between elevator muscle activity and direction of sagittal closing pathway during unilateral chewing,” Journal of Oral Rehabilitation, vol. 29, no. 5, pp. 430–434, 2002.
[22]
A. G. Glaros, D. L. Brockman, and R. J. Ackerman, “Impact of overbite on indicators of temporomandibular joint dysfunction,” Cranio, vol. 10, no. 4, pp. 277–281, 1992.
[23]
I. Ioannidou, E. Gianniou, T. Koutsikou, and G. Kolokithas, “Quantitative description of overjet and overbite and their relationship with the craniofacial morphology,” Clinical orthodontics and research, vol. 2, no. 3, pp. 154–161, 1999.
[24]
M. T. John, C. Hirsch, M. T. Drangsholt, L. A. Mancl, and J. M. Setz, “Overbite and overjet are not related to self-report of temporomandibular disorder symptoms,” Journal of Dental Research, vol. 81, no. 3, pp. 164–169, 2002.
[25]
B. K. Kinaan, “Overjet and overbite distribution and correlation: a comparative epidemiological English-Iraqi study,” British journal of orthodontics, vol. 13, no. 2, pp. 79–86, 1986.
[26]
A. G. Pullinger and D. A. Seligman, “Overbite and overjet characteristics of refined diagnostic groups of temporomandibular disorder patients,” American Journal of Orthodontics and Dentofacial Orthopedics, vol. 100, no. 5, pp. 401–415, 1991.
[27]
G. Sfondrini, P. Gandini, and D. Fraticelli, Ortognatodonzia-Diagnosi, Masson, Milano, Italy, 1997.
[28]
A.-L. Svedstr？m-Oristo, T. Pietil？, I. Pietil？, H. Helenius, P. Peutzfeldt, and J. Varrela, “Selection of criteria for assessment of occlusal acceptability,” Acta Odontologica Scandinavica, vol. 60, no. 3, pp. 160–166, 2002.
[29]
A. A. Lowe, K. Takada, Y. Yamagata, and M. Sakuda, “Dentoskeletal and tongue soft-tissue correlates: a cephalometric analysis of rest position,” American Journal of Orthodontics, vol. 88, no. 4, pp. 333–341, 1985.
[30]
T. Riedman and R. Berg, “Retrospective evaluation of the outcome of orthodontic treatment in adults,” Journal of Orofacial Orthopedics, vol. 60, no. 2, pp. 108–123, 1999.
[31]
M. Kessler, “The bite plate—an adjunct in periodontic and orthodontic therapy,” Journal of Periodontology, vol. 51, no. 3, pp. 123–135, 1980.
[32]
J. Silness and T. Roynstrand, “Effects of the degree of overbite and overjet on dental health,” Journal of Clinical Periodontology, vol. 12, no. 5, pp. 389–398, 1985.
[33]
T. A. Alexander, C. H. Gibbs, and W. J. Thompson, “Investigation of chewing patterns in deep-bite malocclusions before and after orthodontic treatment,” American Journal of Orthodontics, vol. 85, no. 1, pp. 21–27, 1984.
[34]
J. Silness, G. Johannessen, and T. R？ynstrand, “Longitudinal relationship between incisal occlusion and incisal tooth wear,” Acta Odontologica Scandinavica, vol. 51, no. 1, pp. 15–21, 1993.
[35]
W. Bauer, F. van den Hoven, and P. Diedrich, “Wear in the upper and lower incisors in relation to incisal and condylar guidance,” Journal of Orofacial Orthopedics, vol. 58, no. 6, pp. 306–319, 1997.
[36]
A. G. Pullinger and D. A. Seligman, “Quantification and validation of predictive values of occlusal variables in temporomandibular disorders using a multifactorial analysis,” Journal of Prosthetic Dentistry, vol. 83, no. 1, pp. 66–75, 2000.
[37]
J. W. Pair, L. Luke, S. White, K. Atchinson, R. Englehart, and R. Brennan, “Variability of study cast assessment among orthodontists,” American Journal of Orthodontics and Dentofacial Orthopedics, vol. 120, no. 6, pp. 629–638, 2001.
[38]
M. P. S. Caio, C. M. J. Jose, P. B. Diego, M. L. Eduardo, K. G. Patricia, and L. G. Marcio, “Occlusal risk factors for temporomandibular disorders,” The Angle Orthodontist, vol. 77, no. 3, pp. 471–477, 2007.
[39]
J. Abjean and C. Bodin, Restauration Fonctionnelle Par Ajustement Occlusal, vol. 10 of Encycl Med Chir, Odontologie, Elsevier, Paris, 1997.
[40]
C. Bodin, Intérêt Des Traitements OccLusaux Dans L'évoLution De La symptomatoLogie De La Dysfonction Cranio-MandibuLaire, Université de Bretagne occidentale, 1992.
