Forces and moments on posterior teeth generated by incisor intrusion biomechanics

Autor: C Bourauel, Iosif Sifakakis, M Makou, Theodore Eliades, Nikolaos Pandis
Rok vydání: 2009
Předmět:
Zdroj: Orthodontics & Craniofacial Research. 12:305-311
ISSN: 1601-6343
1601-6335
DOI: 10.1111/j.1601-6343.2009.01466.x
Popis: Structured Abstract Authors – Sifakakis I, Pandis N, Makou M, Eliades T, Bourauel C Objectives – To comparatively evaluate the extrusive forces and torquing moments on the posterior dentition generated during anterior intrusion with different intrusion techniques in the maxillary and mandibular dental arch. Material and Methods – Seven wire specimens were used for each of the following intrusive arches: Utility arch 0.016 × 0.016′ Blue Elgiloy®, Utility arch 0.017 × 0.025′ TMA® and Burstone Intrusion arch 0.017 × 0.025′ TMA®. The wires were inserted on bracketed dental arches constructed on maxillary Frasaco models, segmented mesially to the maxillary canines. Simulated intrusion from 0.0–3.0 mm was performed on the Orthodontic Measurement and Simulation System (OMSS). The forces and moments were recorded in all three planes of space at 0.1 mm increments and the values at 3.0 mm for all wires were used for all statistical evaluations. The data were analyzed, separately for the forces and moments, by means of two-way analysis of variance (anova) with forces and moments serving as the dependent variables and intrusion technique and jaw (maxilla or mandible) as the independent variable. Post hoc multiple comparisons were performed using the Tukey test at .05 error rate. Results – The 0.016 × 0.016′ Blue Elgiloy® utility arch exerted the highest posterior extrusive forces, 15% higher than the 0.017 × 0.025′ TMA® utility and 40% higher in comparison with the 0.017 × 0.025′ TMA® Burstone intrusion arch.The lowest posterior moment in the saggital plane was generated by the 0.017 × 0.025′ TMA® Burstone intrusion arch. The 0.016 × 0.016′ Blue Elgiloy® utility arch exerted 15% higher posterior moments and the 0.017 × 0.025′ TMA® utility 25% higher. Forces and moments were consistently larger for the mandible compared to the maxilla for the same intrusion technique. Conclusions – The upper Burstone 0.017 × 0.025′ TMA® intrusion arch exerted the lowest forces/moments on posterior teeth. The highest forces were generated by the 0.016 × 0.016-inch Blue Elgiloy® utility arch and the highest moments by the lower 0.017 × 0.025-inch TMA® utility arch.
Databáze: OpenAIRE
Externí odkaz: