Kara Nihal Beldüz, Çehreli Seçil, Sağırkaya Elçin, Karasoy Durdu
Department of Pediatric Dentistry, Faculty of Dentistry, Ordu University, Ordu, Turkey.
Pediatr Dent. 2013 Jan-Feb;35(1):E19-22.
The purpose of this study was to compare the biomechanics of space maintainers supported by primary and permanent teeth.
Photoelastic models of permanent and primary teeth with a single missing tooth space were cast, and band-and-loop, direct-bonded, and fiber-reinforced space maintainers were fabricated. Linear strain-gauges were bonded next to the teeth and in the middle of the missing tooth space. Strain gauge signals were quantified during 50 N and 100 N static axial load applications on the molar, maintainer, and anterior support at 10 KHz using a data acquisition device and associated computer software.
Regardless of the tooth being restored, strains around the molar teeth and the maintainer region were comparable between the groups under molar and maintainer loading (P>.05). Under 100 N loading on the anterior support, the highest strains were observed in the direct-bonded group (P<.01). Direct-bonded design led to higher strains than the band-and-loop design under 100 N maintainer loading, whereas the strain output of other designs were comparable.
Load distribution of band-and-loop, direct-bonded, and fiber-reinforced space maintainers seem comparable, although direct-bonded maintainers could lead to higher strain concentrations in the buccal side due to bending moments.
本研究的目的是比较由乳牙和恒牙支持的间隙保持器的生物力学性能。
制作有单个缺牙间隙的恒牙和乳牙的光弹性模型，并制作带环式、直接粘结式和纤维增强式间隙保持器。将线性应变片粘结在牙齿旁边和缺牙间隙中间。在使用数据采集设备和相关计算机软件以10kHz的频率对磨牙、间隙保持器和前牙支撑施加50N和100N静态轴向载荷时，对应变片信号进行量化。
无论修复的是何种牙齿，在磨牙和间隙保持器加载下，各组磨牙周围和间隙保持器区域的应变具有可比性（P>0.05）。在前牙支撑施加100N载荷时，直接粘结组观察到最高应变（P<0.01）。在100N间隙保持器加载下，直接粘结设计导致的应变高于带环式设计，而其他设计的应变输出具有可比性。
带环式、直接粘结式和纤维增强式间隙保持器的载荷分布似乎具有可比性，尽管由于弯矩，直接粘结式间隙保持器可能会在颊侧导致更高的应变集中。
