[Effect of different pretreatment methods on dentin microleakage and bonding effect in caries].

Unlabelled: PURPOSE：To evaluate the effect of different pretreatment methods on dentin microleakage and bonding effect of caries, so as to provide reference for clinical practice.

Methods: Sixty isolated caries were collected from Department of Oral and Maxillofacial Surgery, Affiliated Stomatological Hospital of Nanchang University from January 2020 to December 2020, and 120 dental samples were obtained by grinding them into two halves along the long axis of the precursor teeth. According to different pretreatment methods, they were divided into group A (2%NaClO), group B (2% chlorhexidine) and group C (75% ethanol).

[Grape seed proanthocyanidin extracts inhibit lipopolysaccharide of Porphyromonas gingivalis].

Purpose: To study the inhibitory effect of grape seed proanthocyanidin extracts on 1ipopolysacharides of Porphyromonas gingivalis.

Methods: Grape seed proanthocyanidin extracts were double-diluted to different concentrations by two-fold dilution. The effect on Porphyromonas gingivalis was measured by minimal inhibitory concentration (MIC).

[The influence of lower vertical dimension construction of complete denture on cerebral blood flow].

Purpose: To investigate the influence of lower vertical dimension construction on cerebral blood flow among patients with complete denture.

Methods: Ten edentulous patients were chosen and lower vertical dimension was constructed with complete denture. Transcranial Doppler ultrasonography was used to detect the average peak flow velocity, peak systolic velocity and end-diastolic peak flow velocity of the middle cerebral artery.

[Finite element stress analysis of all-ceramic continuous crowns of the lower anterior teeth in differential shoulder thickness].

Purpose: To investigate the stress distributions under load in 3 types of all-ceramic continuous crowns of the lower anterior teeth with differential shoulder thickness.

Methods: Cone-beam CT (CBCT) was used to scan the in vitro mandibular central incisors, and achieve three-dimensional finite element model of all-ceramic continuous crowns with different shoulder width by using Mimics, Abaqus software. Different load conditions were simulated based on this model to study the effect of shoulder width variation on finite element analysis of 3 kinds of different all-ceramic materials of incisors fixed continuous crowns of the mandibular.

[Clinical evaluation of denture adhesive combined with oral wetting spray on satisfaction of complete denture in xerostomia patients].

Purpose: The purpose of this study is to investigate the effect of denture adhesive and oral wetting spray on the satisfaction of wearing complete denture in xerostomia patients.

Methods: Ten edentulous patients who suffered from deficient residual alveolar ridge and xerostomia with poor retention and stability of complete dentures or mandibular complete dentures were employed to assess the differences of satisfaction after use of denture adhesive in their dry oral cavity for 1 week, and use of denture adhesive combined with oral wetting spray for 1 month, 3 months and 6 months by using satisfaction questionnaire. The statistical analysis was carried out with SPSS17.

[The effect of H2O2 surface treatment of posts on the bond strength between glass fiber posts and the resin cement].

Purpose: To evaluate the effect of H2O2 on the push-out bond strength between glass fiber posts and the resin cement.

Methods: Eighteen Tenax glass fiber posts and 18 Macthpost glass fiber posts were randomly assigned to 6 groups according to the surface treatments. Group A, no surface treatment (control group); Group B, treated with silane agent; Group C, treated with 3% H2O2, then with silane agent; Group D, treated with10% H2O2, then with silane agent; Group E, treated with20% H2O2, then with silane agent; Group F, treated with 30% H2O2, then with silane agent.