Kathrin Becker1, Benedict Wilmes2, Chantal Grandjean2, Sivabalan Vasudavan3,4,5, Dieter Drescher2. 1. Department of Orthodontics, University of Düsseldorf, 40225, Düsseldorf, Germany. kathrin.becker@med.uni-duesseldorf.de. 2. Department of Orthodontics, University of Düsseldorf, 40225, Düsseldorf, Germany. 3. Faculty of Science, The University of Western Australia, Perth, Australia. 4. Department of Dentistry, Boston Children's Hospital, Boston, MA, USA. 5. Department of Developmental Biology, Harvard School of Dental Medicine, Boston, MA, USA.
Abstract
PURPOSE: To (1) quantify the three-dimensional treatment effect of a Mesialslider appliance using superimposed digital models, (2) to evaluate anchorage loss (measured by incisor displacement), and (3) to assess agreement between two different matching approaches, i.e., control point (CP)-based and iterative closest point (ICP) matching. METHODS: In a retrospective study, the effects of a skeletally anchored uni- and bilateral mesialization appliance (Mesialslider) as well as simultaneous mesialization and distalization appliance (Mesio-Distalslider) were evaluated in 48 subjects (aged 11-53 years). Pre- and posttreatment casts were digitized and superimposed with two different approaches, i.e., using ten manually selected control points located at the anterior palate and by means of an automated ICP-matching approach using a standardized palatal reference area. The treatment effects were evaluated using control points on the maxillary central incisors and maxillary molar teeth, and the methods were compared through the application of linear regression analyses and computation of alignment errors. RESULTS: Average upper molar mesialization was 6.3 ± 2.6 mm. Anchorage loss, designated as the mean amount of upper incisor displacement, was less than 0.5 mm in all dimensions investigated. Using the measurement method sufficient registration was possible using both approaches and corresponding tooth movements were significantly correlated (p < 0.01). CONCLUSIONS: Accurate measurements of tooth displacement can be performed using both CP- and ICP-based matching approaches. Within the limits of performing a retrospective study, a premolar width of molar mesialization appeared possible without clinically relevant anchorage loss.
PURPOSE: To (1) quantify the three-dimensional treatment effect of a Mesialslider appliance using superimposed digital models, (2) to evaluate anchorage loss (measured by incisor displacement), and (3) to assess agreement between two different matching approaches, i.e., control point (CP)-based and iterative closest point (ICP) matching. METHODS: In a retrospective study, the effects of a skeletally anchored uni- and bilateral mesialization appliance (Mesialslider) as well as simultaneous mesialization and distalization appliance (Mesio-Distalslider) were evaluated in 48 subjects (aged 11-53 years). Pre- and posttreatment casts were digitized and superimposed with two different approaches, i.e., using ten manually selected control points located at the anterior palate and by means of an automated ICP-matching approach using a standardized palatal reference area. The treatment effects were evaluated using control points on the maxillary central incisors and maxillary molar teeth, and the methods were compared through the application of linear regression analyses and computation of alignment errors. RESULTS: Average upper molar mesialization was 6.3 ± 2.6 mm. Anchorage loss, designated as the mean amount of upper incisor displacement, was less than 0.5 mm in all dimensions investigated. Using the measurement method sufficient registration was possible using both approaches and corresponding tooth movements were significantly correlated (p < 0.01). CONCLUSIONS: Accurate measurements of tooth displacement can be performed using both CP- and ICP-based matching approaches. Within the limits of performing a retrospective study, a premolar width of molar mesialization appeared possible without clinically relevant anchorage loss.
Authors: Jennifer L Ashmore; Brenda F Kurland; Gregory J King; Timothy T Wheeler; Joseph Ghafari; Douglas S Ramsay Journal: Am J Orthod Dentofacial Orthop Date: 2002-01 Impact factor: 2.650
Authors: Ali Al-Rimawi; Mostafa EzEldeen; Danilo Schneider; Constantinus Politis; Reinhilde Jacobs Journal: Int J Environ Res Public Health Date: 2019-02-11 Impact factor: 3.390