Publications by authors named "Xue-peng Chen"
Effect of varying auxiliaries on maxillary incisor torque control with clear aligners: A finite element analysis.
Am J Orthod Dentofacial Orthop
July 2024
Article Synopsis
- This study evaluated how different attachments (auxiliaries) affect tooth movement and stress when using clear aligners to torque maxillary central incisors by 1°.
- Five models were tested: no auxiliaries (control), power ridge, semi-ellipsoid attachment, horizontal rectangular attachment, and horizontal cylinder attachment.
- The semi-ellipsoid attachment provided better stress distribution, while the power ridge offered better root control but caused a twist in the teeth.
Article Synopsis
- The study assessed how effective clear aligners are at controlling the torque of upper front teeth based on pre- and post-treatment scans of 47 patients.
- The results showed that the actual torque achieved was significantly lower than what was predicted, with an efficiency rate of about 46.81%.
- The findings suggest that clear aligners have difficulty managing upper-incisor torque, especially regarding root movement, which may require overcorrection to mitigate torque loss.
We present a practical wide-field optical design for a 60 m aperture submillimeter telescope, which is currently under conceptual design study in China. The telescope is specified to operate over a wavelength range of 0.65-3 mm and provide a wide field of view (FOV) of 1° in diameter.
View Article and Find Full Text PDF[Effect of Salvia Miltiorrhiza Bunge on expression of osteoprotegerin in cultured human periodontal ligament fibroblasts].
Shanghai Kou Qiang Yi Xue
October 2010
Article Synopsis
- The study aims to investigate how Salvia Miltiorrhiza Bunge affects the expression of osteoprotegerin (OPG) in human periodontal ligament fibroblasts.
- Researchers established a primary culture of these cells and assessed the impact of varying concentrations of the herb on OPG mRNA and protein levels using RT-PCR and ELISA.
- Results showed that exposure to Salvia Miltiorrhiza Bunge significantly increased both OPG mRNA expression after an hour and OPG protein secretion after twelve hours compared to a control group, indicating its potential to enhance OPG expression in these cells.
[Orthodontic treatment of Class III patients with mandibular asymmetry].
Zhonghua Kou Qiang Yi Xue Za Zhi
December 2008
Objective: To investigate the treatment outcome of Class III patients with dental, functional and mild skeletal mandibular asymmetry.
Methods: Thirty-five patients (14 males and 21 females) with dental, functional and mild skeletal mandibular asymmetry were selected. The age range of the patients was 7 - 22 years with a mean age of 16.
[Study on the height of marginal ridge to cusp in posterior teeth and its effect on brackets placement].
Hua Xi Kou Qiang Yi Xue Za Zhi
June 2008
Article Synopsis
- The study aimed to measure the vertical height from the mesio-distal marginal ridge to the cusps in posterior teeth, which could help in positioning orthodontic brackets.
- A total of 60 patients, aged mostly 12-14, underwent treatment without tooth extraction and were assessed using a three-dimensional laser for accurate height measurements.
- Results showed significant differences in vertical heights among various posterior teeth, but no difference was found between genders or between left and right sides, suggesting guidelines for bracket positioning based on these height measurements.
[Progress in treatment of metastatic tumors in the bone by bisphosphonate].
Zhonghua Zhong Liu Za Zhi
November 2007
Aim: To investigate the expression of vascular endothelial growth factor (VEGF) in cultured human dental follicle cells (HDFC), and to examine the roles of VEGF in the proliferation, differentiation, and apoptosis of HDFC in vitro.
Methods: Immunocytochemistry, ELISA, and RT-PCR were used to detect the expression and transcription of VEGF in cultured HDFC. The dose-dependent and the time-course effect of VEGF on cell proliferation and alkaline phosphatase (ALP) activity in cultured HDFC were determined by MTT assay and colorimetric ALP assay, respectively.
Aim: To explore hereditability of gastric cancer in Wuwei city.
Methods: A case-control study was used to investigate 251 gastric cancer families located in Wuwei city. Li-Mantel-Gan and Falconer regression methods were used to calculate segregation ratios and hereditability.
[Effects of surface potentials of tooth hard tissue on bone remodeling in rabbit tibiae].
Zhonghua Kou Qiang Yi Xue Za Zhi
July 2005
Article Synopsis
- This study explores how the electrical properties of tooth hard tissue influence bone remodeling in rabbits.
- Electrochemical measurements were taken from extracted human teeth, and teeth sections were implanted into the tibiae of 25 rabbits, which were observed over 8 weeks for bone regeneration differences.
- Results showed that the side of the tooth acting as a cathode (cementum) promoted new bone formation, while the anode side (enamel) caused bone resorption, indicating that tooth electrochemistry plays a crucial role in alveolar bone remodeling.