The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Comparison of occlusal contact areas of class I and class II molar relationships at finishing using three-dimensional digital models

  • Lee, Hyejoon (Department of Dentistry, Graduate School of Medicine, Ewha Womans University) ;
  • Kim, Minji (Department of Dentistry, Graduate School of Medicine, Ewha Womans University) ;
  • Chun, Youn-Sic (Department of Dentistry, Graduate School of Medicine, Ewha Womans University)
  • Received : 2014.04.21
  • Accepted : 2015.01.05
  • Published : 2015.05.25
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Abstract

Objective: This study compared occlusal contact areas of ideally planned set-up and accomplished final models against the initial in class I and II molar relationships at finishing. Methods: Evaluations were performed for 41 post-orthodontic treatment cases, of which 22 were clinically diagnosed as class I and the remainder were diagnosed as full cusp class II. Class I cases had four first premolars extracted, while class II cases had maxillary first premolars extracted. Occlusal contact areas were measured using a three-dimensional scanner and RapidForm 2004. Independent t-tests were used to validate comparison values between class I and II finishings. Repeated measures analysis of variance was used to compare initial, set up, and final models. Results: Molars from cases in the class I finishing for the set-up model showed significantly greater contact areas than those from class II finishing (p < 0.05). The final model class I finishing showed significantly larger contact areas for the second molars (p < 0.05). The first molars of the class I finishing for the final model showed a tendency to have larger contact areas than those of class II finishing, although the difference was not statistically significant (p = 0.078). Conclusions: In set-up models, posterior occlusal contact was better in class I than in class II finishing. In final models, class I finishing tended to have larger occlusal contact areas than class II finishing.

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References

  1. Liu D, Melsen B. Reappraisal of Class II molar relationships diagnosed from the lingual side. Clin Orthod Res 2001;4:97-104. https://doi.org/10.1034/j.1600-0544.2001.040206.x
  2. Wheeler RC. An atlas of tooth form. Philadelphia: WB Saunders; 1969.
  3. Casko JS, Vaden JL, Kokich VG, Damone J, James RD, Cangialosi TJ, et al. Objective grading system for dental casts and panoramic radiographs. American Board of Orthodontics. Am J Orthod Dentofacial Orthop 1998;114:589-99. https://doi.org/10.1016/S0889-5406(98)70179-9
  4. Fotis V, Melsen B, Williams S. Posttreatment changes of skeletal morphology following treatment aimed at restriction of maxillary growth. Am J Orthod 1985;88:288-96. https://doi.org/10.1016/0002-9416(85)90127-7
  5. Jang SY, Kim M, Chun YS. Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3- dimensional digital models. Korean J Orthod 2012; 42:182-9. https://doi.org/10.4041/kjod.2012.42.4.182
  6. Gibbs CH, Mahan PE, Lundeen HC, Brehnan K, Walsh EK, Holbrook WB. Occlusal forces during chewing and swallowing as measured by sound transmission. J Prosthet Dent 1981;46:443-9. https://doi.org/10.1016/0022-3913(81)90455-8
  7. Yoon HR, Choi YJ, Kim KH, Chung C. Comparisons of occlusal force according to occlusal relationship, skeletal pattern, age and gender in Koreans. Korean J Orthod 2010;40:304-13. https://doi.org/10.4041/kjod.2010.40.5.304
  8. Yurkstas A, Manly RS. Measurement of occlusal contact area effective in mastication. Am J Orthod 1949;35:185-95. https://doi.org/10.1016/0002-9416(49)90028-7
  9. Garrido Garcia VC, Garcia Cartagena A, Gonzalez Sequeros O. Evaluation of occlusal contacts in maximum intercuspation using the T-Scan system. J Oral Rehabil 1997;24:899-903. https://doi.org/10.1046/j.1365-2842.1997.00586.x
  10. Angle EH. Classification of malocclusion. Dental Cosmos 1899;41:248-64, 350-7.
  11. Hellman M. An interpretation of angle's Classification of malocclusion of the teeth supported by the evidence from comparative anatomy and evolution. Dental Cosmos 1920;62:476.
  12. Jang JM, Lee SB. A qualitative and quantitative study on occlusal conditions in health volunteers and athletes with normal occlusions. J Adv Prosthodont 1998;36:302-22.
  13. Ehrlich J, Taicher S. Intercuspal contacts of the natural dentition in centric occlusion. J Prosthet Dent 1981;45:419-21. https://doi.org/10.1016/0022-3913(81)90104-9
  14. Delong R, Ko CC, Anderson GC, Hodges JS, Douglas WH. Comparing maximum intercuspal contacts of virtual dental patients and mounted dental casts. J Prosthet Dent 2002;88:622-30. https://doi.org/10.1067/mpr.2002.129379
  15. Kim JH, Kim KB, Kim WC, Kim JH, Kim HY. Accuracy and precision of polyurethane dental arch models fabricated using a three-dimensional subtractive rapid prototyping method with an intraoral scanning technique Korean J Orthod 2014;44:69-76. https://doi.org/10.4041/kjod.2014.44.2.69

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