Dental implant restoration for dentition defects improves clinical efficacy, masticatory function and patient comfort.

OBJECTIVE: The aim of this study is to demonstrate if dental implant restoration can improve the clinical efficacy, masticatory function and comfort in patients with dentition defects. METHODS: The clinical data of 90 patients with single tooth loss treated in Yuyao People's Hospital of Zhejiang Province from May 2018 to May 2020 were analyzed retrospectively. The patients were enrolled and divided into two groups. The control group (CG; n=45) was intervened by traditional fixed partial denture (FPD) restoration, and the observation group (OG; n=45) was treated with dental implant restoration. The clinical efficacy was evaluated, and amelioration of tooth-related indexes and clinical indicators 2 years after treatment were observed. The improvement of masticatory function and comfort scores were compared. The adverse reactions during treatment were recorded, and patients' satisfaction with the treatment was calculated. Logistic regression was performed to assess the independent risk factors for inefficacy of the treatments. RESULTS: After treatment, the OG presented with lower gingival index, plaque index and sulcus bleeding index.

Association between DEFB1 polymorphisms and periodontitis: a meta-analysis.

Previous studies showed that DEFB1 gene polymorphisms may impact the development and progression of periodontitis; nevertheless, inconsistent conclusions were described. This study meta-analytically explored the association between periodontitis the DEFB1 gene polymorphisms and periodontitis. We searched PubMed, Embase, Springer and Cochrane Library for the relevant case-control studies of periodontitis up to February 13th, 2019. Two reviewers selected studies according to the predefined inclusion and exclusion criteria. Newcastle-Ottawa Scale (NOS) was used to assess the quality of studies, and the combined effect size was calculated using R 3.12 software. A total of 9 studies involving 4113 patients and 2373 controls were included. Meta-analysis of DEFB1-G1654A gene polymorphisms showed that there were significant differences in model A vs. G (OR = 3.7876, 95%CI = 2.9051-4.9382, P < 0.001), AA vs. GG (OR = 4.6743, 95%CI = 3.0900-7.0710, P < 0.001), AA vs.GG + AG (OR = 3.5131, 95%CI = 2.4496-5.0384, P < 0.001), AA + AG vs. GG (OR = 4.3087, 95%CI = 2.8827-6.4402, P < 0.001) and AG vs. GG (OR = 3.0639, 95%CI = 1.6804-5.5863, P = 0.003). However, no significant differences were found between DEFB1 rs11362, rs1799946 and rs1800972 and periodontitis. Sensitivity analysis implied that our results were robust and no publication bias was noticed. Our meta-analysis showed that the DEFB1-G1654A polymorphism may be a genetic susceptibility factor for periodontitis.

[Influence of repeated sintering on the color of two brands of porcelain-fused-to-titanium].

OBJECTIVE: To investigate the influence of repeated sintering on the color of two porcelain-fused-to-titanium, and the differences between the two porcelains. METHODS: Thirty samples were prepared and sintered for 9 times. The color of samples were measured following sintering 1, 3, 5, 7, 9 times by ShadeEye NCC colorimeter according to two brands of porcelains with CIE1976L*a*b* color system, and calculated relevant chrome, chromatism and hue, and statistical analysis. RESULTS: When two brands of porcelains were sintered 5 times, the color parameters had no significant change and sintered continuely, the color parameters of L* and a* had obvious changes, but can't be observed by eyes. CONCLUSION: The color parameters of titanium-porcelains have no significant change after repeated sintering.

[Esthetics restoration after rapid orthodontic extrusion of subgingivally fractured incisor: a case report].

A case of a patient with subgingivally fractured incisor was presented. Two weeks after root canal therapy, the subgingival fragment was restored with fiber post, resin core and temporary crown. Gingivoplasty was performed around. after the subgingival fragment had been elevated in the axial direction by means of edgewise fixed appliance. Stabilized and held for 6 months, the incisor was restored with all ceramic crown. Optimal esthetic was achieved when restoration was performed after rapid orthodontic extrusion which had lifted up the fracture line above the level of the gingival line within 14 days. At 6-month follow-up, the periodontal tissues were normal and neither luxation nor relapse was noted.

[Bone density changes in the apical area after rapid orthodontic extrusion of subgingivally fractured tooth].

OBJECTIVE: To evaluate the bone density changes in the apical area of subgingivally fractured tooth after rapid orthodontic extrusion. METHODS: Twelve fractured incisors in 11 patients extended 2 - 5 mm below the gingival line were selected. Two weeks after root canal therapy, the subgingival fragment was lifted up and the fracture line was brought 1.5 - 2.0 mm above the level of the gingival line by means of edgewise fixed appliance. After the extrusion completed, the tooth had been stabilized and held for 6 months. The CT Analyser software was used to measure the bone density changes in the apical area on radiographs once a month. Changes of relative value in bone density was quantitatively analyzed. RESULTS: The average period of extrusion was 11 days. The relative value of bone density in the apical region was -39.6% immediately after extrusion and continuously increased afterwards. In the third month, the value (18.5%) changed most rapidly (P < 0.01). CONCLUSIONS: Under the continuous and proper tooth axial extrusion force, the tooth moved rapidly and steadily. The bone density in the apical area approached normal value within 3 months after treatment.