The learning curve of a dynamic navigation system used in endodontic apical surgery.

Background/purpose: Quantitative research was conducted on the learning process of a dynamic navigation system. This study provides guidance for the promotion and application of dynamic navigation technology in the endodontic apical surgery field.

Materials And Methods: Standardized models were designed and 3D printed to form the approach operation of endodontic apical surgery.

Accuracy and efficiency of dynamic navigated root-end resection in endodontic surgery: a pilot in vitro study.

Background: The operation accuracy and efficiency of dynamic navigated endodontic surgery were evaluated through in vitro experiments. This study provides a reference for future clinical application of dynamic navigation systems in endodontic surgery.

Materials And Methods: 3D-printed maxillary anterior teeth were used in the preparation of models for endodontic surgery.

Clinical Outcome and Predictors of Endodontic Microsurgery Using Cone-beam Computed Tomography: A Retrospective Cohort Study.

Introduction: The aim of this retrospective cohort study was to evaluate the clinical outcomes and identify the prognostic factors of endodontic microsurgery based on cone-beam computed tomographic (CBCT) scans.

Methods: Patients who underwent endodontic microsurgery in teeth with asymptomatic apical periodontitis were included. The clinical outcomes were determined based on clinical and radiographic examinations after surgery 12-48 months.

[Preparation of triptolide-loaded dissolving microneedles and its transdermal penetration].

Triptolide(TP), the main active and toxic component of Tripterygium wilfordii, has the limitations of low bioavailability, poor absorption, low concentration in plasma, and small lethal dose. Microneedle(MN), the hybrid of hypodermic needle and transdermal patch, is a physical penetration-enhancing system. Dissolving microneedles(DMNs) can be tailored to specific needs of degradation rate.

Accuracy of root-end resection using a digital guide in endodontic surgery: An study.

Background/purpose: It is difficult to achieve accurate root-end resection clinically. This study was conducted to evaluate the operation accuracy of a digital endodontic surgical guide.

Materials And Methods: 56 extracted maxillary anterior teeth were prepared for endodontic surgical models.

A six-herb Chinese medicine composition ointment as a promising candidate for treatment of hypertrophic scars.

Objective: To study the anti-hypertrophic scar effect of the six-herb Chinese medicine composition (SCMC) ointment on the rabbit ear hypertrophic scar models.

Methods: The optimal formulation of SCMC ointment matrix was screened by the orthogonal designs and a series of evaluation tests. The SCMC ointment was prepared through emulsifying method.

Is Intentional Replantation Appropriate for Treatment of Extensive Endodontic-periodontal Lesions Related to Palatogingival Groove?

This report describes the cases of two patients with a maxillary lateral incisor with palatogingival groove and extensive endodontic-periodontal lesions. Although it is reported that acceptable periodontal status is of great importance in case selection in intentional replantation, it is suggested in this report that intentional replantation could be chosen instead of immediate extraction if extensive endodontic-periodontal lesions exist in a tooth with palatogingival groove. The gingival margin position and gingival papilla were well preserved and the bone defect was almost completely repaired.

Root Canal Morphology of Mandibular Incisors with Double Root Canals in a Chinese Population.

Objective: To investigate the bilateral symmetry of double root canals, variation in root canal bifurcation and position of canal orifices in mandibular incisors in a Chinese population.

Methods: A total of 149 subjects with mandibular incisors with two canals were selected from 866 patients based on CBCT images and divided into three groups: group 1 (< 21 years), group 2 (21-40 years) and group 3 (> 40 years). The prevalence of bilateral symmetry of double root canals (type III and type V), the distance between the cementoenamel junction (CEJ) and the bifurcation (D1) and the distance between the two canal orifices (D2) were calculated and analysed.

[Screening and phosphate-solubilizing characteristics of phosphate-solubilizing actinomycetes in rhizosphere of tree peony.].

A strain PSPSA1 with strong phosphate-solubilizing ability was isolated from the rhi-zosphere of tree peony. This strain was identified based on morphological characteristics, physiological and biochemical experiments, and 16S rDNA sequence analysis. Furthermore, its genetic stabi-lity and phosphate-solubilizing characteristics were investigated.

Comparison of efficacy and outcome satisfaction between in-office and home teeth bleaching in Chinese patients.

This in vivo study aimed to evaluate the efficacy of in-office and home teeth bleaching in Asian patients. Moreover, the correlation between tooth color change and patient's outcome satisfaction was investigated. Overall, 40 Chinese patients were randomly divided into two groups and prescribed in-office (OB) or take-home bleaching (HB).

T2-Weighted Magnetic Resonance Imaging of Hepatic Tumor Guided by SPIO-Loaded Nanostructured Lipid Carriers and Ferritin Reporter Genes.

Nowadays, there is a high demand for supersensitive contrast agents for the early diagnostics of hepatocarcinoma. It has been recognized that accurate imaging information is able to be achieved by constructing hepatic tumor specific targeting probes, though it still faces challenges. Here, a AGKGTPSLETTP peptide (A54)-functionalized superparamagnetic iron oxide (SPIO)-loaded nanostructured lipid carrier (A54-SNLC), which can be specifically uptaken by hepatoma carcinoma cell (Bel-7402) and exhibited ultralow imaging signal intensity with varied Fe concentration on T2-weighted imaging (T2WI), was first prepared as an effective gene carrier.

Outcomes of Endodontic Microsurgery Using a Microscope and Mineral Trioxide Aggregate: A Prospective Cohort Study.

Introduction: The aim of this study was to investigate the outcome of endodontic microsurgery and analyze the prognostic factors.

Methods: Our prospective cohort study included 98 teeth in 81 patients. An endodontist performed all surgical procedures using endodontic microsurgical approaches.

[Effects of different cavosurface margins on color matching of the resin composite].

Objective: To evaluate effects of color matching of different cavosurface margins on the resin composites in vitro.

Methods: Twenty extracted human premolars with an A2 shade buccal surface were used in this study. Rectangular shaped cavities (3.

[Cone-beam computed tomography analysis of root canal configuration of 4 674 mandibular anterior teeth].

Objective: To investigate the root canal configuration of mandibular anterior teeth with cone-beam computed tomography (CBCT).

Methods: The CBCT imaging data of 866 patients who visited Peking University School of Stomatology from October 2012 to July 2013 were inspected by an endodontist anda radiologists together. A total of 4 674 mandibular anterior teeth were involved.

[Effects of hydrogen peroxide-containing bleaching on the growth of Streptococcus mutans biofilm on enamel disc surface].

Objective: To evaluate the effects of a commercial bleaching agent containing 35% (mass fraction) hydrogen peroxide on the growth of Streptococcus mutans biofilm on enamel disc surface.

Methods: A total of 20 enamel disks were made from human extracted teeth and the enamel surfaces were kept intact. The discs were autocalved and randomly divided into two groups: bleaching group and control group.

[Effects of thinning on fine-root morphology, biomass and N concentration of different branch orders of Chinese fir].

Taking a 25-year old Chinese fir (Cunninghamia lanceolata) plantation as the object, this paper studied the effects of thinning on the biomass, morphological traits, and nitrogen concentration of the first five orders roots. With the increase of root order (from the first to the fifth order), there was a significant increase in the fine-root biomass, diameter, and tissue density, and a significantly decrease in the specific root length (SRL), root length density (RLD), and root number (RN). Thinning increased the biomass, RLD, and RN of the first and second orders roots as well as the tissue density of the first, third, fourth, and fifth orders roots significantly, but had no effects on the SRL and nitrogen concentration of each order root.

Effects of chlorhexidine, listerine and fluoride listerine mouthrinses on four putative root-caries pathogens in the biofilm.

Objective: To investigate the effects of chlorhexidine (CHX), Listerine and Fluoride Listerine on putative root-caries pathogens in the biofilm in the artificial mouth model.

Methods: A total of 24 human dentine discs were prepared. A biofilm composed of Streptococcus mutans, Streptococcus sobrinus, Lactobacillus rhamnosus and Actinomyces naeslundii was cultured on the surfaces of human dentine discs in an artificial-mouth model.

[The malocclusion of primary dentition in the suburb of Chengdu: a cross-section survey].

Objective: To reveal malocclusion of primary dentition in the suburb of Chengdu.

Methods: Cross-section survey and malocclusion rate calculation were performed.

Results: There are 491 children with malocclusion from total 1 279 children; the rate of malocclusion is 38.

[Analysis of volatile fatty acids in gingival crevicular fluid of patients with chronic periodontitis].

Objective: To investigate the volatile fatty acids in gingival crevicular fluid (GCF) and to analyze the relationship between the levels of the volatile fatty acids and chronic periodontitis.

Methods: GCF samples taken from 37 patients with chronic periodontitis and 16 volunteers with healthy periodontal status were analyzed by capillary electrophoresis.

Results: The detection frequencies and concentrations of succinic acid, butyric acid and valeric acid were significantly higher in GCF of chronic periodontitis than in that of healthy group.