Publication: Rezorbe olabilen miniplak-vida sistemlerinin tavşan modelinde biyomekanik stabilitelerinin servohidrolik test ünitesi ve sonlu elemanlar analiziyle incelenmesi
Abstract
1. ÖZET Çalışmamızın amacı rezorbe olabilen internal fiksasyon sisteminin tavşan modelinde bilateral mandibular vertikal gövde osteotomisinde (BMVGO) operasyondan hemen sonra, postoperatif 1. ayda ve 3. ayda iyileşme periyotları sonrasında biyomekanik stabilitelerinin servohidrolik test ünitesi (STU) ve 3 boyutlu sonlu elemanlar analizi (SEA) ile karşılaştırılmasıdır. Çalışmamızda 18 adet tavşan kullanılmıştır. Stres testleri anterior insizal kenara 0 N/ cm2’den başlanarak vertikal kuvvet verilip modelde plastik deformasyon ve kırılma oluşana kadar uygulanmıştır. Hemimandibulaların dayanabildikleri maksimum kuvvetler ve deformasyon değerleri her bir model için STU ve SEA ile analiz edilip kaydedilmiştir. İmmediat grupta STU ve SEA testlerinde her iki parametre için de istatistiksel olarak anlamlı farklılık gözlenmemiştir. 1 aylık grupta maksimum kuvvet değerleri SEA’da STU’ya göre istatistiksel olarak anlamlı derecede yüksek ve deformasyon değerleri ise STU’da SEA’ya göre istatistiksel olarak anlamlı derecede yüksek olarak kaydedilmiştir. 3 aylık grupta maksimum kuvvet parametresinde gruplar arasında istatistiksel olarak anlamlı fark görülmezken, deformasyon değerlerinde STU’da SEA’ya göre istatistiksel olarak anlamlı derecede daha yüksek değerlere rastlanılmıştır. Gövde osteotomisi yapılan ve rezorbe olabilen sistemler ile fikse edilen tavşan mandibulasının biyomekanik stabilitelerinin değerlendirildiği STU ve SEA’nın birbirleri yerine kullanılabilirliklerinin testin yapıldığı zamana ve değerlendirilen parametrelere bağlı olarak değiştiği sonucuna varılmıştır. yomekanik, mandibula, osteotomi, rezorbe olabilen implant, sonlu elemanlar analizi. 2.
Assessment of Biomechanical Stability of Biodegradable Miniplate – Screw System With Servohydraulic Testing Unit and Finite Element Analysis in A Rabbit Model The aim of this study is to evaluate biomechanical stability of resorbable internal fixation system in a servohydraulic testing unit (STU) and using 3-D finite element analysis (FEA) in bilateral mandibular vertical body osteotomies (BMVBO) immediately after surgeries, at the postoperative 1st and 3rd months healing periods in a rabbit model. We used 18 rabbits in our study. Stress tests were measured by applying vertical forces at the anterior incisal edge by loading from 0 N/ cm2 until plastic deformation and breakage had occurred. Maximum forces that hemimandibles could stand and the amount of deformations were recorded and analysed in the each option by FEA and STU. In immediate group, there is no significant difference statistically in both maximum forces and deformations data in STU and FEA tests. In 1 month group, maximum forces data in FEA is statistically greater than STU values and deformations data in STU is statistically greater than FEA values. In 3 months group, there is no significant difference statistically in maximum forces data whereas deformations data in STU is statistically greater than FEA values. During the monitoring of biomechanical stabilities of rabbit mandibles in which body osteotomies were performed and fixated with resorbable systems, the use STU and FEA interchangeably depended on the time of testing and assessment parameters. Key Words: biodegradable implant, biomechanics, finite element analysis, mandible, osteotomy.
Assessment of Biomechanical Stability of Biodegradable Miniplate – Screw System With Servohydraulic Testing Unit and Finite Element Analysis in A Rabbit Model The aim of this study is to evaluate biomechanical stability of resorbable internal fixation system in a servohydraulic testing unit (STU) and using 3-D finite element analysis (FEA) in bilateral mandibular vertical body osteotomies (BMVBO) immediately after surgeries, at the postoperative 1st and 3rd months healing periods in a rabbit model. We used 18 rabbits in our study. Stress tests were measured by applying vertical forces at the anterior incisal edge by loading from 0 N/ cm2 until plastic deformation and breakage had occurred. Maximum forces that hemimandibles could stand and the amount of deformations were recorded and analysed in the each option by FEA and STU. In immediate group, there is no significant difference statistically in both maximum forces and deformations data in STU and FEA tests. In 1 month group, maximum forces data in FEA is statistically greater than STU values and deformations data in STU is statistically greater than FEA values. In 3 months group, there is no significant difference statistically in maximum forces data whereas deformations data in STU is statistically greater than FEA values. During the monitoring of biomechanical stabilities of rabbit mandibles in which body osteotomies were performed and fixated with resorbable systems, the use STU and FEA interchangeably depended on the time of testing and assessment parameters. Key Words: biodegradable implant, biomechanics, finite element analysis, mandible, osteotomy.