Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Minas Gerais, Brazil.
Arch Oral Biol. 2011 Nov;56(11):1373-81. doi: 10.1016/j.archoralbio.2011.04.002. Epub 2011 May 8.
The influence of bone loss and periodontal splinting on strains in supporting bone is still not well understood. The aim of this study was to analyse the effect of bone loss and periodontal splints on strains in an anterior mandible structure.
Ten anterior mandible models were fabricated using polystyrene resin. Eighty human teeth were divided in 10 groups (right first premolar to left premolar) and embedded in simulated periodontal ligament. Strain gauges were attached to the buccal and lingual mandible surfaces. The models were sequentially tested for 7 conditions: no bone alterations and no splinting; 5mm of bone loss between canine teeth; bone loss associated with resin splint between canine teeth; bone loss with wire splint; bone loss with wire/resin splint; bone loss with extracoronal fibre-glass/resin splint; and bone loss with intracoronal fibre-glass/resin splint. Oblique loads (50, 100, and 150N) were applied on the teeth. Data were analysed using 3-way ANOVA and Scheffe's test (α=.05).
Strains on buccal surface were higher than on lingual surface. Bone loss resulted in strain increase at 100 and 150N loading. Dental splinting with resin resulted in strain values similar to the control levels.
Bone loss increased strain mainly in the buccal region. Dental splints with adhesive system and composite resin produced lower bone strains irrespective of occlusal load.
骨量丧失和牙周夹板对支持骨应变的影响仍不清楚。本研究旨在分析骨量丧失和牙周夹板对前下颌骨结构应变的影响。
使用聚苯乙烯树脂制作 10 个前下颌骨模型。80 个人工牙分为 10 组（从右侧第一前磨牙到左侧前磨牙），并嵌入模拟牙周韧带中。将应变片贴附在下颌骨颊侧和舌侧表面。模型依次测试 7 种情况：无骨改变和无夹板；犬牙之间有 5mm 的骨丢失；犬牙之间有树脂夹板的骨丢失；有金属丝夹板的骨丢失；有金属丝/树脂夹板的骨丢失；有体外玻璃纤维/树脂夹板的骨丢失；和有牙内玻璃纤维/树脂夹板的骨丢失。在牙齿上施加斜向负载（50、100 和 150N）。使用三因素方差分析和 Scheffe 检验（α=.05）对数据进行分析。
颊侧表面的应变高于舌侧表面。骨丢失导致在 100 和 150N 加载时应变增加。用树脂进行牙夹板固定导致的应变值与对照水平相似。
骨丢失主要增加了颊侧的应变。无论咬合负荷如何，带有粘接系统和复合树脂的牙夹板都会产生较低的骨应变。
