To study the outcome of the application of clinical orthodontics. Patients with deep overbite in this study intend to create front teeth resin modified fixed flat bite plates, which were modified to reflect their periodontal health, including plaque index, bleeding index, probe pocket depth, attachment loss and gingival crevicular fluid. These measurements were used to create the resin bite plates, which will help clinical orthodontists to provide guidance for the treatment of patients with deep overbites.

Forty patients with deep overbite receiving periodontal care were chosen in Inner Mongolia Baogang Hospital from August 2014 to August 2015. Teeth 11, 12 or 21, 22 were randomly selected as the experimental group. The contralateral tecth were set as the control group.A modified fixed resin flat guide plate was prepared for the experimental group. No intervention was given to the control group. Before wearing, 6 weeks after and 2 weeks after the removal of the guides, plaque index, bleeding index, probe pocket depth and attachment loss were determined and recorded by a physician and gingival crevicular fluid was measured using the filter paper method and weighed of both groups. The resulting data was processed with one-way ANOVA and t test.

In the experimental group, the bleeding index, the depth of the probe and the amount of gingival liquid were not statistically significant (F=0.42, 0.84, 0.34, P=0.66, 0.44, 0.71). However, the difference of plaque index was statistically significant (F=5.82, P=0.05). The plaque index of experimental group in 6 weeks after making plane plate was 1.38±0.64, compared with the before making plane guide 1.10±0.70 and 2 weeks after the removal of the plane plate 1.17±0.61, the differences were statistically significant (t=3.18, 2.58, P=0.02, 0.01). For the control group, there were no significant differences in the plaque index, bleeding index, probing index, loss of attachment and gingival crevicular fluid among the 3 phases (F= 0.13, 0.22, 0.11, 1.44, P= 0.88, 0.24, 0.90, 0.24). Before making plane plate, 2 weeks after removal of plane plate, a comparison of was made between the experimental group and control group, there were no statistically significant difference (with P values above 0.05). In the 6 weeks after making the plane guide, the experimental group and the control group showed a significant increase in plaque index, and the difference was statistically significant (P<0.05). The other indicators of hemorrhage index, depth of diagnosis and gingival fluid volume were not statistically significant (with P values above 0.05). The attachment loss of the experimental group and the control group was 0 for 6 weeks after making the plane guide plate, before making the plane guide plate and after removing the plane guide plate for 2 weeks.

Resin modified fixed flat bite plate does not cause periodontal tissue inflammation. As for the impact of plaque, plaque adhesion can be suppressed by improving brushing guidance.