关键词: Nance弓, VAS量表, 菌斑指数, 牙龈指数, 探诊深度, 正畸, Nance arch, VAS, plaque index, gingival index, probe depth, orthodontics

Abstract: Objective To study the clinical satisfaction of a new style Nance arch without bands and its influence on periodontal tissue compared with traditional Nance arch. Methods 40 adolescent malocclusion patients with the need of mid-level anchorage were randomly divided into two groups, wearing two kinds of Nance arches. Visual Analogue Scales (VAS) was used to evaluate the degree of comfort wearing different Nance arches after 4 weeks. Plaque indexes, Gingival indexes and Probe depth of the upper first molar were collected after 4 weeks, 8 weeks and 12 weeks respectively. All data were subject to paired t-test and χ2 analysis. Results The degree of comfort wearing new style Nance arch was obviously higher than wearing traditional Nance arch and the periodontal index was also superior. Patients in new style Nance arch group suffered less from Gingival inflammation. Conclusion New style Nance arches are more favorable compared with traditional Nance arches in terms of degree of comfort and are more effective in reducing the influence on periodontal health and preventing gingival inflammation.