[Imaging characteristic of Stafne bone cavity：a retrospective study based on cone-beam CT].

Purpose: To guide clinical decision-making more efficiently via collecting and analyzing the imaging data of patients with Stafne bone cavity(SBC).

Methods: Six patients with SBC were retrospectively reviewed in Stomatological Hospital of Shandong University. By assessing cone-beam CT (CBCT) data, age, sex, complaint, cavity location, diameter at three dimension, maximal cross-sectional area of multi-planar reconstruction planes, content gray scale, morphological classification and its relationship with mandibular canal were recorded respectively.

An analysis of the optimal intrusion force of the maxillary central incisor with root horizontal resorption using the finite element method and curve fitting.

There are no studies on the optimal intrusion force in orthodontic patients with the existing root resorption (RR). The study aimed to analyze the optimal intrusion force for central incisors with existing horizontal root resorption using the finite element method (FEM). We calculated the optimal intrusion force using the finite element method and curve fitting.

Prolonged viral shedding in feces of pediatric patients with coronavirus disease 2019.

Objective: To determine the dynamic changes of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA in respiratory and fecal specimens in children with coronavirus disease 2019 (COVID-19).

Methods: From January 17, 2020 to February 23, 2020, three paediatric cases of COVID-19 were reported in Qingdao, Shandong Province, China. Epidemiological, clinical, laboratory, and radiological characteristics and treatment data were collected.

The relationship between endothelial progenitor cells and pulmonary arterial hypertension in children with congenital heart disease.

Background: Pulmonary arterial hypertension (PAH) caused by congenital heart disease (CHD) is very common in clinics. Some studies have shown that PAH is related to the number of endothelial progenitor cells (EPCs), but there is no report on the relationship between PAH and the number of EPCs in children with CHD.

Methods: In this study, a total of 173 cases with CHD (from 0 to 6 years old) were collected.

Factors associated with prehospital delay in patients with ST-segment elevation acute myocardial infarction in China.

Background: Prehospital delay is the most critical factor to prognosis of ST-elevation myocardial infarction (STEMI). Few study had examined a series of predictors of prehospital delay by multivariate analysis of sociodemographic and clinical characteristics, onset features, and symptom condition of STEMI in China.

Methods: A total of 1088 hospitalized STEMI participants were screened to collect sociodemographic data, medical history information, and symptom onset status from clinical medical records.

[Construction of keratinocyte growth factor phage active peptides for the promotion of epidermal cell proliferation].

Objective: To construct and display the keratinocyte growth factor (KGF) phage active peptides so as to detect the promoting effects of epidermal cell.

Methods: KGF sequences were chosen and their primers were designed. The selected genes of P1, P2 and P4 were obtained by reverse transcription (RT)-PCR.

Association between mandibular posterior alveolar morphology and growth pattern in a Chinese population with normal occlusion.

Objective: To investigate the relationship between growth patterns and mandibular posterior tooth-alveolar bone complex morphology in a Chinese population with normal occlusion.

Methods: Forty-five patients with normal occlusion (23 males, 22 females) were included in this study. Among these patients, 20 displayed the vertical growth pattern, and 20 had the horizontal growth pattern, while the remaining patients displayed the average growth pattern.

Transcription factor osterix modified bone marrow mesenchymal stem cells enhance callus formation during distraction osteogenesis.

This study was designed to investigate the effects of local delivery of bone marrow mesenchymal stem cells (BMMSCs) with or without osterix (OSX) gene transfected on bone regeneration in the distracted zone using a rabbit model of mandibular lengthening. Fifty-four New Zealand white rabbits underwent osteodistraction of the left mandible and were then randomly divided into group A, group B, and group C (n = 18 for each group). At the end of distraction BMMSCs transfected with OSX, autologous BMMSCs and physiological saline were injected into the distraction gaps in groups A, B, and C, respectively.

Transarterial embolization of a high-flow maxillary arteriovenous malformation fed by multiple arteries.

A high-flow maxillary arteriovenous malformation fed by multiple arteries, including bilateral internal maxillary arteries and ophthalmic artery, is reported. A combination of polyvinyl alcohol particles and N-butyl-cyanoacrylate mixed with lipiodol was progressively deposited within the distal vascular bed by transarterial superselective embolization of the branches of bilateral internal maxillary arteries, resulting in complete anatomic and clinical cure. The authors feel that this approach is more secure and effective compared with transfemoral venous embolization and direct transosseous puncture.

[Mandibular keratocyst induced trigeminal neuralgia: report of one case].

Trigeminal neuralgia is very common in clinic, but the etiology is still unclear. This articles reported a case of trigeminal neuralgia induced by jaw keratocyst. The clinical manifestation, radiographic characteristic, pathologic diagnosis and treatment were discussed.

[Experimental study of mandibular periosteal distraction in rabbits].

Objective: To investigate a novel technique for new bone formation--periosteal distraction osteogenesis.

Methods: A custom made periosteal distraction device was fixed to bilateral surface of the mandible in three rabbits. Periosteal distraction was performed on the left side of the mandible, the right side of the mandible served as the control.

[Repair of mandibular central fissures in rabbits with hBMP-2 gene modified tissue engineered bone].

Purpose: To evaluate the effectiveness of the tissue engineered bone substitute loaded with periosteal-derived osteoblasts (POBs) transfected by adenovirus mediated human bone morphogenetic protein-2 gene (Ad-hBMP-2) in the repair of rabbit mandibular central fissures.

Methods: 45 rabbits with the soft tissue in the mandibular central fissures removed were randomly divided into 5 groups, group I: Ad-hBMP-2 transfected POBs/bioglass group (n=10); group II: adenovirus mediated enhanced green fluorescent protein (Ad-EGFP) gene transfected POBs/bioglass group (n=10); group III: untransfected POBs/bioglass group (n=10); group IV: single bioglass group (n=10); group V: control group (n=5). The above bone substitutes were implanted in the rabbit mandibular central fissures respectively except group V.

[The experimental study of cryopreserved osteoblasts combined with BGC repairing mandibular defects in rabbits].

Objective: The purpose of this study was to observe the biological characteristics of cultured Periosteal-derived Osteoblasts (POBs) preserved in liquid nitrogen in vitro, and to preliminarily study the osteogenetic capability of bioactive glass ceramic (BGC) combined with POBs.

Methods: The cryopreserved cells were cultured in DMEM medium and examined by morphological and histological assay. The POBs growing well in vitro were seeded into the porous BGC materials.