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Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Laboratory of Biomaterials, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, Brazil
Master Program in Dentistry, Universidade São Leopoldo Mandic, Rio de Janeiro, RJ 22221-070, Brazil
Author to whom correspondence should be addressed.
Academic Editor: João Manuel R. S. Tavares
Metals 2017, 7(3), 80;
Received: 28 December 2016 / Accepted: 16 February 2017 / Published: 3 March 2017
PDF [1570 KB, uploaded 6 March 2017]


The objective was to analyze the influence of dentary and orthopedic forces under static and dynamic loads in temporary screw stability. Self-drilling titanium (Ti6Al4V) screws (6 × 1.5 mm) were inserted and removed from pig ribs. Screws were loaded by static loads of 2 N and 5 N for 5 weeks. Dynamic force was applied during 56,000 cycles for simulations of a patient’s opening–closing mouth movements. Dynamic applied loads ranged from 2 to 5 N and from 5 to 7 N under a frequency of 1 Hz. Torque peak values at placement and removal were measured before and after static and dynamic cycles. Similarities in torque peaks (p = 0.3139) were identified at placement (12.54 Ncm) and removal (11.2 Ncm) of screws after a static load of 2 N. Statistical comparisons showed significant stability loss after dynamic cycles under loads of 2 N (64.82% at p = 0.0005) and 5 N (64.63% at p = 0.0026). Limited stability loss occurred in temporary screws submitted to 2 N static forces (p = 0.3139). The detrimental effects of dynamic cycles in temporary screws stability was attested after the simulation of dentary and skeletal forces, being intermittent forces more relevant in the loss of mechanical stability. View Full-Text
Keywords: temporary screws; stability; torque; titanium; biomechanics temporary screws; stability; torque; titanium; biomechanics

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Fernandes, D.J.; Barbosa, F.A.; Ferreira, L.M.; Elias, C.N. Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles. Metals 2017, 7, 80.

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