Clinical effects of different etching modes for universal adhesives: a systematic review and meta-analysis.

Background: To evaluate the clinical performance of universal adhesives in etch-and-rinse or self-etch application modes through meta-analysis.

Methods: A literature search was performed by two reviewers in the PubMed, Cochrane Library, and Embase databases (from January 2000 to March 2020). A total of 2,516 non-replicated records were identified and filtered.

Temperature-dependent circular conversion dichroism from chiral metasurfaces patterned in Dirac semimetal CdAs.

Chiral metasurfaces patterned with L-shaped holes in a thin film of Dirac semimetal Cd3As2 are designed. The impact of temperature T on circular conversion dichroism, mainly characterized by circular polarization differential transmittance (CPDT), is studied by rigorous coupled-wave analysis. The results show that decreasing T will give rise to the appearance of much more narrow CPDT peaks and dips, and the maximum differential transmittance between two opposite circularly polarized light can reach above 0.

Dental caries and associated factors among Chinese children and adolescents: A protocol for systematic review and meta-analysis.

Background: Dental caries is a common disease under the action of many factors. Dental caries may occur in all age groups, among which children and adolescents are at high risk of dental caries. Early identification of the risk factors of dental caries is very important for clinical staff to prevent and intervene as soon as possible and reduce the incidence of dental caries.

[Surgical treatment of nasosinus tumor involving base of the anterior cranial fossa].

Objective: To explore the operative approach for nasosinus tumors involving the base of the anterior cranial fossa.

Method: Seven cases with defects, diameter less than 2 cm, on the skull base without damage of the duramater were not repaired. Other 7 cases with defects, diameter more than 2.