The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Proposed parameters of optimal central incisor positioning in orthodontic treatment planning: A systematic review

  • Sangalli, Linda (Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia) ;
  • Dalessandri, Domenico (Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia) ;
  • Bonetti, Stefano (Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia) ;
  • Mandelli, Gualtiero (Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia) ;
  • Visconti, Luca (Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia) ;
  • Savoldi, Fabio (Orthodontics, Division of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong)
  • Received : 2021.07.09
  • Accepted : 2021.09.29
  • Published : 2022.01.25
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Abstract

Objective: Planning of incisal position is crucial for optimal orthodontic treatment outcomes due to its consequences on facial esthetics and occlusion. A systematic summary of the proposed parameters is presented. Methods: Studies on Google Scholar©, PubMed©, and Cochrane Library, providing quantitative information on optimal central incisor position were included. Results: Upper incisors supero-inferior position (4-5 mm to upper lip, 67-73 mm to axial plane through pupils), antero-posterior position (3-4 mm to Nasion-A, 3-6 mm to A-Pogonion, 9-12 mm to true vertical line, 5 mm to A-projection, 9-10 mm to coronal plane through pupils), bucco-lingual angulation (4-7° to occlusal plane perpendicular on models, 20-22° to Nasion-A, 57-58° to upper occlusal plane, 16-20° to coronal plane through pupils, 108-110° to anterior-posterior nasal spine), mesio-distal angulation (5° to occlusal plane perpendicular on models). Lower incisors supero-inferior position (41-48 mm to soft-tissue mandibular plane), antero-posterior position (3-4 mm to Nasion-B, 1-3 mm to A-Pogonion, 12-15 mm to true vertical line, 6-8 mm to coronal plane through pupils), bucco-lingual angulation (1-4° to occlusal plane perpendicular on models, 87-94° to mandibular plane, 68° to Frankfurt plane, 22-25° to Nasion-B, 105° to occlusal plane, 64° to lower occlusal plane, 21° to A-Pogonion), mesio-distal angulation (2° to occlusal plane perpendicular on models). Conclusions: Although these findings can provide clinical guideline, they derive from heterogeneous studies in terms of subject characteristics and reference methods. Therefore, the optimal incisal position remains debatable.

Keywords

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