Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Minas Gerais, Brazil.
Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Minas Gerais, Brazil.
Dent Traumatol. 2021 Apr;37(2):247-255. doi: 10.1111/edt.12616. Epub 2020 Dec 4.
BACKGROUNDS/AIMS: Traumatic dental injuries with bone fractures require rigid splinting. The degree of rigidity of the wire-composite splints can be challenging. The aim of this study was to evaluate the effect of the rigidity of different wire-composite splints on alveolar process displacement.
A model was created using polystyrene resin to simulate the anterior maxilla, bovine incisors to simulate maxillary incisors, and polyether impression material to simulate the periodontal ligament. An alveolar process fracture was created, while maintaining the labial bone connection with the PDL. Four wire-composite splints (0.3, 0.6, 0.9, and 1.2 mm in diameter) were compared with models without splints and with no fracture (n = 5). The alveolar process displacement was measured (3 times per model/per splint type) at the fractured and adjacent central incisor regions using a deflectometer (Instron) under functional cycling and static loading (100 N). Data (μm) were analyzed using RM ANOVA, followed by Tukey's HSD test (α = 0.05).
The displacement at the region of the adjacent incisor was not influenced by the splint during static and cycling load (P > .05). The Tukey test demonstrated that the model without splints had significantly higher alveolar process displacement at the traumatized teeth than that of all other splint models (P < .001). Increasing the wire diameter from 0.3 mm to 0.9 mm significantly reduced the alveolar process displacement (P < .001). No difference was observed between the 0.9 mm (P = .123) and 1.2 mm (P = .219) wire-composite splints irrespective of the measured tooth regions.
The rigidity of the wire-composite splint significantly influenced the mobility of the fractured alveolar process. The use of at least 0.9 mm wire was effective in reducing the fractured alveolar process displacement to a level that was similar to the adjacent teeth.
背景/目的：伴有骨骨折的外伤性牙损伤需要刚性夹板固定。线复合夹板的刚性程度具有挑战性。本研究的目的是评估不同线复合夹板的刚性对牙槽突移位的影响。
使用聚苯乙烯树脂创建模型，以模拟上颌前牙，牛切牙模拟上颌切牙，聚醚印模材料模拟牙周膜。创建牙槽突骨折，同时保持 PDL 与唇侧骨的连接。将 4 种线复合夹板（直径 0.3、0.6、0.9 和 1.2mm）与无夹板和无骨折模型（n=5）进行比较。使用挠度计（Instron）在功能循环和静态加载（100N）下测量骨折和相邻中切牙区域的牙槽突位移（每个模型/每个夹板类型测量 3 次）。使用 RM ANOVA 分析数据（μm），然后使用 Tukey 的 HSD 检验（α=0.05）。
在静态和循环加载下，夹板对邻牙区域的位移没有影响（P>.05）。Tukey 检验表明，无夹板模型在受伤牙齿处的牙槽突位移明显高于其他所有夹板模型（P<.001）。从 0.3mm 增加到 0.9mm 的线直径可显著减少牙槽突位移（P<.001）。在测量的牙齿区域中，0.9mm（P=0.123）和 1.2mm（P=0.219）的线复合夹板之间没有差异。
线复合夹板的刚性显著影响骨折牙槽突的活动性。使用至少 0.9mm 的线可有效减少骨折牙槽突的位移，使其达到与相邻牙齿相似的水平。
