Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Preliminary Investigation of the Biomechanics of Unilateral Chewing Comparing Two Testing Models: In Vitro Study
İki Farklı Test Modelinin Karşılaştırılarak Tek Taraflı Çiğnemenin Biyomekaniğinin Öncü Araştırması: İn Vitro Çalışma
Esin DEMİRa
aDepartment of Oral and Maxillofacial Surgery, Selçuk University Faculty of Dentistry, Konya, TURKIYE
Turkiye Klinikleri J Dental Sci. 2022;28(1):7-12
doi: 10.5336/dentalsci.2021-83295
Article Language: EN
Full Text
ABSTRACT
 Objective: This article reports a preliminary study undertaken to investigate the biomechanics of unilateral chewing due to lateral segmental defects extending to angulus, introducing modified designs of 3-point and 2 point testing models. Data concerning test setups used in biomechanic studies of mandible in the literature have been analysed. Material and Methods: Load/displacement data were gathered for the mandibles with the same defect and reconstructed with reconstruction plate in a standart way. Standard models underwent unilateral loading with two different test set-up. The first set-up was consistent with 3 point testing model (Group I) while the second set-up was simulating 2 point testing model (Group II). Furthermore, literature related with in vitro studies of mandible were searched and testing setups used in these studies were evaluated. Results: The mean displacement for Group I was 12.11 mm (±3.36), Group II was 19.56 (±0.92) mm. Group II had significantly greater (p=0.000) displacement when compared with Group I. The mean force before failure for Group I was 850.3 N (±136.1 N), Group II was 1117.83 N (±107.3 N). Models tested with two point system failed at significantly greater force (p=0.000), Conclusion: Three point testing model was more efficient and reflecting the chewing forces better under unilateral loading. Many biomechanic studies in the literature adopted three point system for their studies.

Keywords: Mandible reconstruction; jaw neoplasms; mouth neoplasms
ÖZET
 Amaç: Bu makale, angulusa uzanan lateral segmental defekt sebebiyle meydana gelen tek taraflı çiğnemenin biyomekaniğini araştırarak, 2 nokta ve 3 nokta test modellerinin modifiye dizaynlarının denendiği öncü çalışmayı rapor etmektedir. Mandibulanın biyomekanik çalışmalarında kullanılan deney düzeneği bilgileri de analiz edilmiştir. Gereç ve Yöntemler: Aynı standart defekt oluşturulmuş ve rekonstrüksiyon plağı ile aynı standart yöntem ile rekonstrükte edilmiş mandibulalarda yük/displasman verileri elde edilmiştir. Standart modeller 2 farklı deney düzeneğinde sabitlenerek tek taraflı yüklemeye maruz bırakılmıştır. Birinci deney düzeneği (Grup I) 3 nokta test modeli ile uyumlu iken 2. deney düzeneği (Grup II) 2 nokta test modelini simüle etmektedir. Ayrıca mandibulanın in vitro çalışmaları ile ilgili literatür taranarak, bu çalışmalarda kullanılan deney düzenekleri değerlendirilmiştir. Bulgular: Ortalama yer değişikliği Grup I'de 12,11 mm (±3,36), Grup II'de 19,56 (±0,92) mm olarak bulunmuştur. Grup II Grup I ile karşılaştırıldığında istatistiksel olarak anlamlı oranda daha fazla displasman göstermiştir (p=0,000). Başarısızlığa neden olan ortalama maksimum kuvvet Grup I'de 850,3 N (±136,1 N), Grup II'de 1117,83 N (±107,3 N) olarak bulunmuştur. İki nokta sisteminde teste tabi tutulan modeller anlamlı olarak daha fazla kuvvet dayanımı göstermiştir (p=0,000). Sonuç: Üç nokta test modeli daha etkindir ve tek taraflı yüklemede çiğneme kuvvetlerini daha iyi taklit edebilmektedir. Birçok biyomekanik çalışmada, deneylerinde 3 nokta test modelini benimsemişlerdir.

Anahtar Kelimeler: Mandibula rekonstrüksiyonu; çene neoplazmları; ağız neoplazmları
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