DMAHDM@MPC nanoparticles in orthodontic adhesive inhibit cariogenic bacteria and sugar metabolism to prevent enamel demineralization.

During orthodontic treatment, poor oral hygiene often facilitates the proliferation of cariogenic bacteria, particularly , leading to lactic acid accumulation and subsequent enamel demineralization. To mitigate this issue, Dimethylaminohexadecyl methacrylate (DMAHDM) was incorporated onto the protein-repellent surface of 2-Methacryloyloxyethyl phosphorylcholine (MPC), resulting in the formation of a DMAHDM@MPC composite. This composite was then integrated into resin-modified glass ionomer cement (RMGIC) to develop an antimicrobial orthodontic adhesive, termed RMGIC + MPC + DMAHDM (RMD).

Dynamic effects of fixed orthodontic treatment on oral health and oral microbiota: a prospective study.

Objective: This prospective clinical study examined the effects of fixed orthodontic appliances on oral hygiene and assessed changes in the oral microflora structure of orthodontic patients using high-throughput sequencing technology.

Methods: A total of 45 patients undergoing initial fixed orthodontic treatment were recruited from three hospitals in Beijing, China. Clinical parameters and oral hygiene habits questionnaire were recorded at pre-treatment (T0) and at a 6-month follow-up (T1).

Evaluation of midpalatal suture maturation stage in 5- to 20-year-olds using cone-beam computed tomography.

Introduction: This study aimed to evaluate the midpalatal suture (MPS) maturation stages using the cone-beam computed tomography classification method in Chinese children aged 5-10 years, adolescents aged 11-15 years, and postadolescents aged 16-20 years and identify a correlation between maturation stage and age and sex.

Methods: Axial sections of tomographic images from 717 participants (369 female and 348 male participants) aged 5-20 years were used to classify the maturation stage of the MPS (stages A, B, C, D, and E). Kappa statistics were used to evaluate the measurement error.

Influence of resin modified glass ionomer cement incorporating protein-repellent and antimicrobial agents on supragingival microbiome around brackets: an split-mouth 3-month study.

Objective: To explore the influence of resin modified glass ionomer cement (RMGIC) adhesives containing protein-repellent and quaternary ammonium salt agents on supragingival microbiome, enamel and gingival health around brackets.

Materials And Methods: Ten patients (21.4 ± 3.

[Rapid determination of trace volatile organic compounds in ambient air by portable gas chromatography-mass spectrometry].

Objective: Direct determination of 35 trace volatile organic compounds in air by portable gas chromatography mass spectrometry( GC-MS).

Methods: The mixed standard gas of different concentration levels was prepared with high purity nitrogen as diluent gas. The samples were injected into the GC-MS by a hand-held probe.

[Spectrometric determination of the content of nutritional elements in fruits of different red pear varieties].

A study was carried out on the contents of nutritional elements such as K, Fe, Zn, Ca, Cu, Mg and Mn in three different red pear varieties, namely Meirensu, Hongsucui and Mantianhongs, by flame atomic absorption. The results indicated that the linear relationships for different elements within the limits of working curves are good, and the range of recovery is 98%-104%, hence showing that the results asre satisfactory. There are abundant nutritional elements in fruits of the three different red pear varieties, meaning that they all have a relatively high nutritive value.