[Analysis of correlation between maxillary molars and maxillary sinus mucosal thickening].

PURPOSE: To investigate the influence of maxillary molars on the thickening of maxillary sinus mucosa by cone-beam CT (CBCT). METHODS: A total of 72 patients with periodontitis were included in the study and 137 cases of maxillary sinus were evaluated using CBCT for the following parameters: location, tooth, maximal mucosal thickness, alveolar bone loss, vertical intrabony pockets and minimal residual bone height. The maxillary sinus mucosal thickness ≥2 mm was defined as mucosal thickening. The parameters that could influence the dimensions of the maxillary sinus membrane were assessed. The data were analyzed using univariate analysis and binary logistic regression by SPSS 25.0 software package. RESULTS: Mucosal thickening was present in 56.2% of 137 cases and increased in frequency as the alveolar bone loss of the corresponding molar progressed from mild (21.1%) to moderate (56.1%) to severe (69.2%), and the risk of maxillary sinus mucosal thickening increased by 6-7 times (moderate OR=7.13, 95%CI: 1.37-37.21; severe OR=6.29, 95%CI: 1.06-37.37). The severity of vertical intrabony pockets was correlated with the presence of mucosal thickness (no intrabony pockets 38.7%; type Ⅰ 63.4%; type Ⅱ 79.4%), with an increased risk of maxillary sinus mucosal thickening (type Ⅰ OR=3.72, 95%CI: 1.01-13.70; type Ⅱ OR=5.39, 95%CI: 1.15-25.30). The minimal residual bone height was negatively correlated with the presence of mucosal thickness(≤4 mm OR=99.00, 95%CI: 17.42-562.79). CONCLUSIONS: Alveolar bone loss, vertical intrabony pockets and the minimal residual bone height in maxillary molars were significantly associated with mucosal thickening of the maxillary sinus.

[Effect of keratinized gingival width on periodontal regenerative surgery for the treatment of intrabony defects: a retrospective study].

PURPOSE: To evaluate the effect of keratinized tissue width (KTW) on periodontal regenerative surgery for the treatment of intrabony defects. METHODS: The clinical data of 14 patients (44 intrabony defect sites) treated with periodontal regenerative surgery were retrospectively analyzed at baseline and 2-year of follow-up. Forty four sites were divided into KTW2 mm group and KTW≤2 mm group according to KTW at baseline. Periodontal clinical indicators of the 2 groups were analyzed by SPSS 25.0 software package. RESULTS: At 2-year post-treatment, probing depth (PD) and clinical attachment loss (CAL) in the 2 groups were decreased significantly compared with those at baseline(P<0.05). There was no significant difference in ΔPD, but ΔCAL in KTW2 mm group was significantly greater than that in KTW≤2 mm group. CONCLUSIONS: Periodontal regenerative surgery for the treatment of intrabony defects can effectively reduce periodontal pocket inflammation, decrease periodontal pocket depth and increase the level of attachment. When the width of the keratinized gingiva is insufficient(KTW≤2 mm), the regeneration of the attachment level obtained by surgery is limited, and the efficacy of regenerative surgery is poor.