The significance of appropriate mesiodistal angulations of the teeth in completed orthodontics patients has been highlighted by many clinicians. 1 Nance H.N. The limitations of orthodontic treatment. Part II. Am J Orthod Oral Surg. 1947; 33: 253-301 Abstract Full Text PDF Scopus (72) Google Scholar , 2 Dewel B.F. Clinical observations on the axial inclination of teeth. Am J Orthod. 1949; 35: 98-115 Abstract Full Text PDF PubMed Scopus (39) Google Scholar , 3 Dempster W.T. Adams W.J. Duddles R.A. Arrangement in the jaws of the roots of the teeth. J Am Dent Assoc. 1963; 67: 779-797 Abstract Full Text PDF PubMed Scopus (56) Google Scholar , 4 Andrews L.F. The six keys to normal occlusion. Am J Orthod. 1972; 62: 296-309 Abstract Full Text PDF PubMed Scopus (647) Google Scholar It has been reported that the final spatial orientation of each tooth should be such that it can best withstand the forces during function. 3 Dempster W.T. Adams W.J. Duddles R.A. Arrangement in the jaws of the roots of the teeth. J Am Dent Assoc. 1963; 67: 779-797 Abstract Full Text PDF PubMed Scopus (56) Google Scholar , 4 Andrews L.F. The six keys to normal occlusion. Am J Orthod. 1972; 62: 296-309 Abstract Full Text PDF PubMed Scopus (647) Google Scholar , 5 Ash M.M. Occlusion. in: Ash M.M. Wheeler’s dental anatomy, physiology and occlusion. W. B. Saunders, Philadelphia1993: 414-470 Google Scholar There are no absolute rules that can be assumed when describing tooth inclinations; however, statistical data in anatomical specimens and nonorthodontic normal occlusions have been collected and analyzed. 3 Dempster W.T. Adams W.J. Duddles R.A. Arrangement in the jaws of the roots of the teeth. J Am Dent Assoc. 1963; 67: 779-797 Abstract Full Text PDF PubMed Scopus (56) Google Scholar , 4 Andrews L.F. The six keys to normal occlusion. Am J Orthod. 1972; 62: 296-309 Abstract Full Text PDF PubMed Scopus (647) Google Scholar Andrews 4 Andrews L.F. The six keys to normal occlusion. Am J Orthod. 1972; 62: 296-309 Abstract Full Text PDF PubMed Scopus (647) Google Scholar might have been the first to give a quantitative assessment of tooth angulation as a key for normal occlusion. This concept played a role in the development of the straight-wire appliance. Panoramic evaluation of mesiodistal axial inclinations of maxillary anterior teeth in orthodontically treated subjectsAmerican Journal of Orthodontics and Dentofacial OrthopedicsVol. 130Issue 1PreviewIntroduction: The objectives of this study were to evaluate, through panoramic radiographs, the mesiodistal axial inclinations of the maxillary anterior teeth at the beginning and end of nonextraction orthodontic treatment, and to compare the results with the mesiodistal axial inclinations of a control sample with normal (acceptable) occlusions. Methods: The experimental sample consisted of 40 white patients (20 male, 20 female; mean age, 14 years) with Class I maloccusions who were treated orthodontically with a standard edgewise (not preadjusted) technique without extractions. Full-Text PDF