A static occlusal analysis based on ideal interarch and intraarch relationships.
Study models were visually assessed to quantify the number of ideal tooth relationships actually present relative to the potential total. Both intraarch and interarch relationships were used to generate an ideal tooth relationship index (ITRI). Index scores were generated for the entire dentition, which could be divided into anterior, posterior, interarch, and intraarch relationships. Index scores were determined at various time intervals so the longitudinal changes could be studied. Treated orthodontic cases (n = 92) showed an initial total ITRI score of 26% that increased to 52% at the end of orthodontic treatment and continued to improve to 59% during the retention and postretention periods. Anterior segment scores were higher (64%) than posterior segment scores (44%). The intraarch relationships of the anterior segment registered the highest (75%), whereas the lingual cusp relationships of the posterior segment had the lowest scores (35%). Various types of malocclusions exhibited different ITRI scores before treatment but responded equally to treatment showing similar improvement in scores at the end of treatment and the posttreatment period.
Haeger
R S
RS
Department of Orthodontics, University of Illinois, College of Dentistry, Chicago.
Schneider
B J
BJ
BeGole
E A
EA
D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000473:pathology; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000033:anatomy & histology*; D003768:Dental Occlusion, Centric; D006801:Humans; D007180:Incisor / Q000473:pathology; D008311:Malocclusion, Angle Class I / Q000473:pathology / Q000628:therapy; D008312:Malocclusion, Angle Class II / Q000473:pathology / Q000628:therapy; D008313:Malocclusion, Angle Class III / Q000473:pathology / Q000628:therapy; D003765:Models, Dental; D008963:Molar / Q000473:pathology; D012690:Serial Extraction; D014070:Tooth / Q000033:anatomy & histology*