Correlation between chronic periodontitis and pulmonary ventilation function / 中国基层医药

Objective:To investigate the correlation between chronic periodontitis and pulmonary ventilation function.Methods:A total of 135 patients with chronic periodontitis who received treatment in Yuyao People's Hospital of Zhejiang Province between June 2014 and December 2019 were included in this study. They were divided into group A (stage I, initial lesion, n = 45), group B (stage II, early lesion, n = 45), group C (stage III, confirmed lesion, n = 45) according to the severity of periodontal lesion. Lung ventilation function indexes and serum levels of interleukin-6 (IL-6), IL-8 and tumor necrosis factor-alpha (TNF-α) were compared among the three groups. The correlation between periodontal condition and lung ventilation function indexes was analyzed. Results:Probing depth (PD), clinical attachment loss (CAL), number of missing teeth, alveolar bone resorption level were (1.67 ± 0.65) mm, (2.48 ± 0.44) mm, 0 pieces, and (1.38 ± 0.23) mm in group A, (2.05 ± 0.30) mm, (4.04 ± 0.97) mm, 1 piece, (3.37± 0.73) mm in group B, and (2.23 ± 0.47) mm, (5.17 ± 0.75) mm, 3 pieces, (6.48 ± 0.62) mm in group C. With the worsening of the disease, PD, CAL, number of missing teeth, and alveolar bone resorption level were gradually increased. PD, CAL and alveolar bone resorption level in group C were significantly higher than those in group A ( t = 4.68, 20.75, 51.74, all P < 0.001) and group B ( t = 2.17, 6.18, 21.78, P = 0.033, < 0.001, < 0.001). PD, CAL and alveolar bone resorption level in group B were significantly higher than those in group A ( t = 3.56, 9.82, 17.44, all P < 0.001). There was no significant difference in the number of missing teeth ( P > 0.05). Serum IL-6, IL-8 and TNF-α levels were (11.28 ± 4.26) ng/L, (7.48 ± 1.97) ng/L, (14.59 ± 2.11) ng/L in group A, (17.09 ± 4.91) ng/L, (10.82 ± 2.10) ng/L, (19.95 ± 4.48) ng/L in group B, and (26.47 ± 5.86) ng/L, (15.06 ± 2.75) ng/L, (33.76 ± 6.30) ng/L] in group C. With the worsening of the disease, serum IL-6, IL-8 and TNF-α levels were gradually increased. Serum IL-6, IL-8 and TNF-α levels in group C were significantly higher than those in group A ( t = 14.06, 15.03, 19.36, P < 0.001) and group B ( t = 8.23, 8.22, 11.98, all P < 0.001). Serum IL-6, IL-8 and TNF-α levels in group B were significantly higher than those in group A ( t = 6.00, 7.78, 7.26, P < 0.001). The percentage of the maximum expiratory volume in the first second to the predicted value (FEV 1%pre) and the ratio of the maximum expiratory volume in the first second to the forced vital capacity (FEV 1/FVC) were (81.53 ± 6.30)% and (68.73 ± 4.65)% in group A, (70.47 ± 5.25)% and (60.86 ± 3.42)% in group B, and (59.02 ± 3.41)% and (56.93 ± 4.21)% in group C. With the worsening of the disease, FEV 1%pre and FEV 1/FVC were gradually decreased. FEV 1%pre and FEV 1/FVC in group C were significantly lower than those in group A ( t = 21.08, 12.62, both P < 0.001) and group B ( t = 12.27, 4.86, both P < 0.001). FEV 1%pre and FEV 1/FVC in group B were significantly lower than those in group A ( t = 9.05, 9.25, both P < 0.001). Spearman correlation analysis showed that serum IL-6, IL-8 and TNF-α levels were negatively correlated with FEV1%pre and FEV 1/FVC ( r = -0.50, -0.28, -0.42, -0.61, -0.34, -0.51, all P < 0.05). Conclusion:There is a correlation between chronic periodontitis and pulmonary ventilation function. Inflammatory mediators may be involved in chronic periodontitis as internal systemic factors.

Influence of surface treatment on bond strength of porcelain to pure titanium and the color of porcelain / 国际生物医学工程杂志

The surface of pure titanium consequently covered by a stable oxide layer at room temperature, due to its highly reactivity, the oxide layer easily develops into thick contaminated layer at high temperture, that further effects the bond strength between titanium and porcelain. Therefore, surface treatment on pure titanium is very important. This article reviews the methods of surface treatment on pure titanium and the effect on the bond strength and the color of porcelain.

The effect of veneer on the marginal fit of the copings using different materials / 实用口腔医学杂志

Objective:To compare the marginal fit changes between after-and before-veneering of the copings using three kinds of materials:gold alloy,cp titanium and Ni-Cr alloy,so as to determine whether the fit changes was influenced with the veneer and their clinical significance.Methods:24 maxillary incisor acrylic resin PFM abutments fabricated by machine with the consolidated standard were divided into three groups,each abutment was waxed-up,invested,and casted with three kinds of materials:gold alloy,cp titanium and Ni-Cr alloy.For all groups,the copings were repositioned on their respective abutments,the marginal fit values of four points of each coping were measured.Furthermore,after three groups of copings were veneered with recommended porcelain,marginal fit values of same point of each abutment were remeasured.SAS software was used to carry out statistical analysis.Results:One way analysis of variance of marginal fit values revealed significant differences between before and after veneering in three groups,and the marginal fit value enhanced after veneered.Among three groups,cp titanium group had a significant difference when compared with other two groups(P