Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles
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. Dynami...
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doaj-8726e5e7da50496ea92547f866054a8b2020-11-24T22:39:47ZengMDPI AGMetals2075-47012017-03-01738010.3390/met7030080met7030080Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load CyclesDaniel J. Fernandes0Flavia A. Barbosa1Ligia M. Ferreira2Carlos N. Elias3Laboratory of Biomaterials, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, BrazilMaster Program in Dentistry, Universidade São Leopoldo Mandic, Rio de Janeiro, RJ 22221-070, BrazilLaboratory of Biomaterials, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, BrazilLaboratory of Biomaterials, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, BrazilThe 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.http://www.mdpi.com/2075-4701/7/3/80temporary screwsstabilitytorquetitaniumbiomechanics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Daniel J. Fernandes Flavia A. Barbosa Ligia M. Ferreira Carlos N. Elias |
spellingShingle |
Daniel J. Fernandes Flavia A. Barbosa Ligia M. Ferreira Carlos N. Elias Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles Metals temporary screws stability torque titanium biomechanics |
author_facet |
Daniel J. Fernandes Flavia A. Barbosa Ligia M. Ferreira Carlos N. Elias |
author_sort |
Daniel J. Fernandes |
title |
Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles |
title_short |
Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles |
title_full |
Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles |
title_fullStr |
Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles |
title_full_unstemmed |
Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles |
title_sort |
primary stability of temporary screws after dentary and orthopedic forces under static and dynamic load cycles |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2017-03-01 |
description |
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. |
topic |
temporary screws stability torque titanium biomechanics |
url |
http://www.mdpi.com/2075-4701/7/3/80 |
work_keys_str_mv |
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