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Geometric morphometric evaluations of a randomized prospective split‐mouth study on modes of ligation and reverse‐curve mechanics
Author(s) -
Čelar A. G.,
Onodera K.,
Bertl M. H.,
Astl E.,
Bantleon H.P.,
Sato S.,
Mitteroecker P.
Publication year - 2014
Publication title -
orthodontics and craniofacial research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 55
eISSN - 1601-6343
pISSN - 1601-6335
DOI - 10.1111/ocr.12042
Subject(s) - premolar , dentistry , orthodontics , bracket , malocclusion , plaster casts , arch , dental arch , ligature , dentition , nickel titanium , medicine , mathematics , materials science , surgery , composite material , molar , structural engineering , engineering , shape memory alloy
Structured Abstract Objectives To evaluate tooth position after six and 9 months of orthodontics with conventional brackets on one side of the dentition and ligature‐less brackets on the other. Setting and sample population Orthodontic Division, Vienna Medical University. Twenty patients aged 22.5 ± 5.7 years, symmetrical malocclusion and arch form, no premolar extraction. Material and Methods Prospective split‐mouth study, 0.022‐inch SmartClip self‐ligating brackets assigned randomly to the left or right dentition, conventional 0.018‐inch brackets on the other side. 52 dental landmarks, digitized on plaster casts, represented dental arches at baseline ( t 0 ), 6 months and 9 months ( t 1 , t 2 ). During t 0 –t 1 , we used 0.016 and 0.014 x 0.025 inch superelastic wires, during t 1 –t 2 connected reverse‐curve hemiarch wires: 0.017 x 0.025 inch ß‐titanium on the ligature‐less side, and 0.016 x 0.022 inch Elgiloy multiloop wires on conventional brackets. Morphometric analyses were used to assess differences in dental arch shapes. Results Neither initial alignment nor the reverse‐curve phase showed statistically significant differences between ligature‐less and conventional brackets in moving teeth. Conclusion Morphometric shape analyses corroborated current evidence that self‐ligating brackets were no more effective than conventional brackets with steel ligatures after 6‐month initial alignment. From months 6–9 treatment with ß‐titanium reverse‐curve wires on 0.022‐inch ligature‐less brackets resulted in similar tooth positions as accomplished by Elgiloy multiloop wires on 0.018‐inch steel‐ligature‐tied brackets.