TODENTJ-25-03-2019_TODENTJ-3-167 1553505082 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 7 28 2009 3 1 R.N. Smith A.H Brook M. Karmo Objectives: This study investigates coincidence of the most-prominent point and the mid-point on upper anterior teeth in relation to the use of straight-wire appliances. Materials and Methods: Alginate impressions of the upper jaw were obtained from forty Caucasian patients. Impressions were cast using hard dental stone. The teeth on each upper study model (canine to canine) were marked along the facial axis of the clinical crown (FACC line) then separated using a very thin diamond disc. Each tooth was mounted on a glass slide using sticky wax and cut into two halves down this FACC line. Images were acquired of the sections and a straight line connecting the gingival margin and the incisal edge was drawn on the flat cut surfaces (now the proximal crosssectional view). From this line, perpendicular lines were drawn at the mid-point and most prominent point to the labial curve. Coincidence rate was calculated or whether the most prominent point was gingival or incisal to the mid-point. Results: Approximately 80% of upper central incisors had coincident mid- and most-prominent points. Upper lateral incisors and canine teeth had approximately 50% coincidence. The vast majority of cases without coincidence showed the most-prominent point incisal to the mid-point for all tooth kinds with just 5% or less gingival. Conclusions: The high proportions of non-coincident examples found suggest that clinicians should be aware of individual variation and that this may possibly effect 3rd order alignment. 7 28 2009 167 172 TODENTJ-3-167 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2008-9-26 2008-11-6 2009-6-8 2009-7-28 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210600903010167 1553505082 https://opendentistryjournal.com/VOLUME/3/PAGE/167/ https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-167/TODENTJ-3-167.xml Proffit WR. Contemporary Orthodontics In: Louis: CV Mosby Co. 1993. J Clin Orthodont Andrews LF 10 99 1976 Andrews LF. The straight-wire appliance origin, controversy, commentary J Clin Orthodont 1976; 10 : 99-114. Am J Orthodont Balut N 102 62 1992 Balut N, Klapper L, Sandrik J, Bowman D. Variation in bracket placement in the pre-adjusted orthodontic appliance Am J Orthodont 1992; 102 : 62-7. Am J Orthodont Andrews LF 62 269 1972 Andrews LF. The six keys to normal occlusion Am J Orthodont 1972; 62 : 269-309. Brook AH, Smith RN, Elcock C, Al-Sharood MH, Shah AA, Karmo M. In The measurements of tooth morphology: development and validation of a new image analysis system In: Mayhall JJ, Hakkinon T, Eds. Eds Dental Morphology. Finland: Oalaunios Press 1999; pp. 380-7. Fleiss JL. Reliability of measurement, the design and analysis of clinical experiments In: New York: Wiley and Sons Inc 1986; pp. 1-32. Lancet Bland JM 1 307 1986 Bland JM, Altman DG. Statistical method for assessing agreement: two methods of clinical measurement Lancet 1986; 1 : 307-10. Stat Med Donner A 6 441 1987 Donner A, Eliasziw M. Sample size requirements for reliability studies Stat Med 1987; 6 : 441-8. San Diego: Wells LA Andrews L 1989 Andrews L, Straight-wire F. The Concept and Appliance San Diego: Wells LA 1989. J Dent Res Taylor RMS 48 5 1969 Taylor RMS. Variation in form of human teeth. An anthropologic and forensic study of maxillary incisors J Dent Res 1969; 48 : 5-16. Thruow RC. Edgewise Orthodont In: Louis: CV Mosby 1972. Am J Orthodont Meyer M 73 485 1978 Meyer M, Nelson G. Pre-adjusted edgewise appliance theory and practice Am J Orthodont 1978; 73 : 485-98. Am J Orthodont Germane N 60 49 1986 Germane N, Bentley B, Isaacson JR, Rever JH. The morphology of the canines in relation to pre-adjusted appliances Am J Orthodont 1986; 60 (1) : 49-54. Brit J Orthodont Taylor NG 19 25 1992 Taylor NG, Cook PA. The reliability of positioning pre-adjusted Brackets: an in vitro Study Brit J Orthodont 1992; 19 (1) : 25-34. Eur J Orthodont Van Loenen M 27 258 2005 Van Loenen M, Degrieck G, De Pauw G, Dermaut L. Anterior tooth morphology and its effect on torque Eur J Orthodont 2005; 27 : 258-62.