Dental Clinic 1 - Operative Dentistry and Periodontology, Friedrich-Alexander-University, Erlangen, Germany.
Dent Traumatol. 2011 Dec;27(6):422-31. doi: 10.1111/j.1600-9657.2011.01033.x. Epub 2011 Jul 26.
To evaluate the influence of wire dimension and wire length on the splint rigidity of wire-composite splints in vitro.
A custom-made artificial model was used. The central incisors simulated 'injured' teeth with increased mobility, and the lateral incisors and canines served as 'uninjured' teeth with physiological mobility. To assess horizontal and vertical tooth mobility before and after splinting, the Periotest and Zwick methods were applied. Teeth 13-23 were splinted using wire-composite splint 1 (WCS1; Dentaflex 0.45 mm) and wire-composite splint 2 (WCS2; Strengtheners 0.8 × 1.8 mm). Splint length was varied by successively shortening the wire. The influence of wire dimension was tested using t-test and Wilcoxon-Mann-Whitney test with the Bonferroni-Holm procedure (α = 0.05). To test the influence of wire length, anova and Kruskal-Wallis tests as well as Tukey range and Wilcoxon test with Bonferroni-Holm procedure were applied (α = 0.05).
Wire dimension significantly influenced splint rigidity (P < 0.05). The wire length significantly influenced the splint rigidity of WCS1 in the horizontal dimension and WCS2 in the horizontal and vertical dimensions (P < 0.05). Splint rigidity was significantly reduced when splinting only 'injured' teeth compared with splints including 'uninjured' adjacent teeth (P < 0.05). No differences were found between splints including one or two 'uninjured' teeth on each side (P > 0.05).
WCS1 is flexible compared with the more rigid WCS2. The wire length influences the rigidity. To ensure adequate fixation and reduce the risk of enamel damage during splint removal, the splint should include only one 'uninjured' tooth bilaterally.
评估线的尺寸和长度对线-复合夹板夹板刚度的影响。
使用定制的人工模型。中央切牙模拟“受伤”牙齿，活动度增加，侧切牙和尖牙则为具有生理活动度的“未受伤”牙齿。为了评估夹板前后的水平和垂直牙齿活动度，应用 Periotest 和 Zwick 方法。使用线-复合夹板 1（WCS1；Dentaflex 0.45 毫米）和线-复合夹板 2（WCS2；Strengtheners 0.8 × 1.8 毫米）夹板 13-23 个牙齿。通过连续缩短线来改变夹板长度。用 t 检验和 Wilcoxon-Mann-Whitney 检验（Bonferroni-Holm 程序，α=0.05）检验线尺寸的影响。为了检验线长度的影响，采用方差分析和 Kruskal-Wallis 检验以及 Tukey 范围和 Wilcoxon 检验（Bonferroni-Holm 程序，α=0.05）。
线尺寸对线夹板刚度有显著影响（P<0.05）。线长度对线夹板 1 的水平尺寸和线夹板 2 的水平和垂直尺寸的夹板刚度有显著影响（P<0.05）。与包括“未受伤”相邻牙齿的夹板相比，仅夹板“受伤”牙齿时，夹板刚度显著降低（P<0.05）。每侧包括一个或两个“未受伤”牙齿的夹板之间没有差异（P>0.05）。
与更刚性的 WCS2 相比，WCS1 更灵活。线长度会影响刚度。为了确保足够的固定并减少在夹板拆除过程中釉质损伤的风险，夹板应仅包括每侧一个“未受伤”牙齿。
