[Histological changes in the circum-maxillary sutures during alternate maxillary expansions and constrictions in a rat model].

Objective: To investigate changes in the circum-maxillary sutures during alternate maxillary expansions and constrictions in a rat model.

Methods: Twenty-two male Sprague-Dawley rats (6 weeks old) were used and divided into three groups. In maxillary expansion (ME) group (n=9), an expander was activated for 5 d, and then sacrificed.

Fish Oil Supplements Lower Serum Lipids and Glucose in Correlation with a Reduction in Plasma Fibroblast Growth Factor 21 and Prostaglandin E2 in Nonalcoholic Fatty Liver Disease Associated with Hyperlipidemia: A Randomized Clinical Trial.

Unlabelled: Fish oil has been used effectively in the treatment of cardiovascular disease via triglyceride reduction and inflammation modulation. This study aimed to assess the effects of fish oil on patients with nonalcoholic fatty liver disease (NAFLD) associated with hyperlipidemia. Eighty participants with NAFLD associated with hyperlipidemia were randomly assigned to consume fish oil (n=40, 4 g/d) or corn oil capsules (n=40, 4 g/d) for 3 months in a double-blind, randomized clinical trial.

Comparative characterization of maxillary expansion and alternate maxillary expansions and constrictions in rats.

The purpose of this study was to evaluate whether the cranial and circumaxillary sutures react differently to maxillary expansion (ME) and alternate maxillary expansions and constrictions (Alt-MEC) in a rat model. Twenty-two male Sprague-Dawley rats (6 weeks old) were used and divided into three groups. In ME group (n=9), an expander was activated for 5 days.

Intrusion of overerupted maxillary molars with miniscrew implant anchorage: a radiographic evaluation.

The aim of this retrospective study was to quantitatively evaluate the treatment effects of intrusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.

[Histological changes of craniofacial sutures after retractive forces with zygomatic implant anchorage to the maxilla of rhesus monkeys].

Purpose: To demonstrate the histological changes of the maxilla-facial sutures caused by retractive forces of a zygomatic implant anchorage to the maxilla of rhesus monkeys.

Methods: Four young male rhesuses were employed, 3 in the experimental group (1 was been distracted for 1.5 months and 2 for 3 months), and 1 as control.

[Influence of the mandibular second premolar extraction on the angulation of the mandibular third molar].

Objective: To compare the angular changes in the developing mandibular third molars in the mandibular second premolar extraction and non-extraction cases and to determine whether the mandibular second premolar extraction causes favorable rotational changes in the angulations of the developing mandibular third molars and benefits its later eruption.

Methods: Pretreatment and posttreatment panoramic radiographs were taken from 45 subjects who had been treated by the extraction of the mandibular second premolars and 48 subjects who had been treated without extraction. The horizontal reference plane was used to measure and compare the changes in the angulations of the developing mandibular third molars.

Malocclusions in Xia Dynasty in China.

Background: The prevalence of malocclusion in modern population is higher than that in the excavated samples from the ancient times. Presently, the prevalence of juvenile malocclusion in the early stage of permanent teeth is as high as 72.92% in China.

[Dental changes of patients with obstructive sleep apnea and hypopnea syndrome treated by oral appliance for more than 6 years].

Objective: To investigate dental changes in long-term oral appliance treatment of obstructive sleep apnea and hypopnea syndrome(OSAHS).

Methods: A total of 7 patients were included in the study. The three-dimensional (3D) model study was used to investigate the delicate changes of dentition.

Comparison of the biological response of osteoblasts after tension and compression.

The aim of this study was to investigate the difference in the biological response of osteoblasts when stretched and compressed. A cellular cyclic tension and compression apparatus (CCTCA) was designed to stretch and compress cells under the same conditions. After stretching or compressing MC3T3-E1 with continuously increased strain for 5 hours, cellular cytoskeletal modulation was detected by immunohistochemical assay with actin antibody.

[Changes of blood flow volume in dog's mental artery after mandible osteocompression].

Objective: To observe the changes of blood flow volume in mental artery of dog before and after osteocompression.

Methods: 16 adult dogs were selected and the osteocompressors were fixed on the right buccal side of the mandible. The osteocompressor was used to compress the mandible 1.

[Relationship between craniofacial and airway structure and pediatric obstructive sleep apnea and hyponea syndromes: a case-control study].

Objective: The children obstructive sleep apnea and hyponea syndromes has become a global research hot spot, but the research of craniofacial features in obstructive sleep apnea and hyponea syndromes (OSAHS) children was scarce. To evaluate the craniofacial features of obstructive sleep apnea and hyponea syndromes children.

Methods: The subjects involved in this study fell into two groups: the patient group and the control one.

[Induction of human dental pulp stem cells of premolars into osteoblast-like cells by mineralizing culture medium].

Purpose: To induce human dental pulp stem cells(HDPSCs) of premolars into osteoblast-like cells by mineralizing culture medium.

Methods: HDPSCs of premolars were induced by mineralizing culture medium for 28 days.The activity of ALP was examined by enzyme histochemical staining on the 7th and 28th day.

A comparison study of upper airway among different skeletal craniofacial patterns in nonsnoring Chinese children.

Objective: Patients with OSAS (obstructive sleep apnea syndrome) demonstrate decreased upper airway dimension and craniofacial skeletal abnormalities. The study was performed to analyze whether upper airway dimensions differed among Chinese nonsnoring children of different sagittal and vertical skeletal facial morphologies.

Materials And Methods: Lateral cephalometric records were used to measure the dimensions of the upper airway.

[Current research of dentistry on obstructive sleep apnea hypopnea syndrome].

Obstructive sleep apnea hypopnea syndrome (OSAHS) has been the main research area of the Dental Therapy Center for Sleep Apnea, Peking University School and Hospital of Stomatology. The basic research in the center includes: epidemic survey of OSAHS and snoring in a Beijing population, setting up the cephalometric and MRI standard of airway and surrounding structures for non-snoring Chinese, aetology exploring OSAHS from views of airway size, craniofacial form, neck circumference and genioglossus muscle activity. Clinically, different dental appliances were developed.

[Z2 appliance: the pre-adjusted appliance based on Chinese normal occlusion].

Z2 appliance is the pre-adjusted appliance designed for Chinese orthodontic patients. The prescription of the appliance is based on Chinese normal occlusion, which is much different from the West in the first and the second orders as well as the third one. The appliance routinely includes 20 brackets and 8 molar buccal tubers with 3 standard arch forms.

[Magnetic resonance imaging survey of the upper airway in different age non-snoring males].

Objective: To investigate the morphology characters of upper airway and its surrounding tissues in different age non-snoring males.

Methods: Total of 114 non-snoring males, with age-range from 22 to 78 year old, were included in this study. They were divided into 3 groups: 30 in younger group (22-29 years old), 57 in middle-aged group (36-57 years old), and 31 in aged group (70-78 years old).

[Dental caries in ancient Chinese in Xia Dynasty].

Objective: To study the ancient teeth helped us to acquaint with the evolution of oral diseases.

Methods: Teeth and jaws excavated in Erlitou, Henan province and Youyao, Shanxi province were observed clinically with care. The total specimens included 56 individuals (38 males and 18 females, including 894 permanent teeth and 86 dental arches).

[Clinical evaluation of preadjusted appliance based on Chinese normal occlusion].

Objective: To evaluate the effect of the preadjusted appliance (Z1 appliance) based on Chinese normal occlusion.

Methods: Thirty non-extraction patients were treated with Z1 appliance. No wire bending was made during treatment.

[Correlation of upper airway and surrounding tissues with body mass index in non-apnea aged males].

Objective: To approach the correlation of upper airway and surrounding tissues with body mass index (BMI) of non-apnea aged males.

Methods: Thirty-one non-apnea aged from 70 years to 84 years males (all were inspected by polysomnography and apnea hyponea index < 10 times/hour) had magnetic resonance imaging scanned. In images of MRI, the upper airway was divided into four sections, including nasopharynx, velopharynx, glossopharynx and laryn-gopharynx.

[Magnetic resonance imaging in the assessment of the temporomandibular joint structure following mandibular advancement].

Objective: To investigate the changes in the disc-condyle-fossa relationship following mandibular advancement.

Methods: Twenty-five patients (10 boys and 15 girls, 11.1 +/- 1.

[Effects of orthodontic tooth movements on serum and local estrogen expression].

Purpose: To investigate the changes of the serum and local estrogen level during orthodontic tooth movements and attempt to elucidate the bio-mechanism of orthodontic treatment.

Methods: A Wistar rat experimental model was established to apply orthodontic activation during different stages of estrous cycle. One hundred and twenty female rats were randomly divided into sham-operated group, activation group and control group.

[Study on periodontal disease in Chinese in Xia Dynasty].

Objective: To study the teeth of the ancients in Xia Dynasty, the first dynasty in Chinese history about 4 000 years ago, and acquaint ourselves with their incidences of periodontal disease,and the evolution of oral diseases.

Methods: The teeth and jaws excavated in Erlitoou, Henan Province and Youyao, Shanxi Province were observed with clinical methods. The specimens totaled 56 individuals (male 38, and female 18), including 894 teeth, and 86 dental arches.

[Morphology of upper airway and surrounding tissues in non-apnea males aged seventy years or over: a magnetic resonance imaging study].

Objective: To describe the morphology of upper airway in non-apnea males aged seventy years or over.

Methods: Thirty-one non-apnea males aged 70 years or over [diagnosed by whole-night polysomnography (PSG), apnea and hypopnea index (AHI) < 10 per hour] had been taken magnetic resonance imaging (MRI) scanning.

Results: The narrowest point of upper airway was at velopharynx.