Humans ; Mouth ; Photography

Animals ; Dental Cements ; chemistry ; Glass ; chemistry ; Humans ; Materials Testing ; Post and Core Technique ; instrumentation ; Quartz ; chemistry ; Root Canal Therapy ; Tooth Fractures ; prevention & control

Color ; Dental Materials ; Dental Restoration, Permanent

Prosthesis Coloring

Prosthesis Coloring ; Tooth

Academic Dissertations as Topic

Human stem cell is a unique cell population with the ability of self renewal and differentiation. There are many types of stem cells in human embryonic body and adult tissues, and they have crucial functions in human development. The stem cell differentiation is of great importance for the success of stem cell based therapies,whose effectiveness is determined by the intrinsic property of the cells and the cell microenvironment. The studies on the differentiation of human stem cell include the structural property of the cell and the molecular mechanism in vivo and in vitro . The aim of scientists is to gain the renewable and directional differential stem cells in vitro and use them for a variety of human diseases.

砄bjective: To study the rule of the degradation of HA artificial bone(HAB). Methods: The samples of HAB were immersed in PBS or distilled water (DW),the changes of the shape, weight, compressive strength of the samples and pH value of the immersion solutions were measred at the intervals of 2 or 4 weeks until 28 weeks. Results: At 4 weeks, HAB began to be degraded, 8 weeks later, the speed of the degradation slowed down. From 4 to 12 weeks, the compressive strength decreased rapidly. The pH value of the immersion solutions decreased from 2 to 12 weeks,but increased from 12 to 28 weeks when it was close to the neutral value. Conclusion: HA artificial bone can be degraded in PBS solution, and the degradation can cause noticeable changes of the compressive strength of the material and pH value of the immersion solution.

Objective: To observe the clinical effects of comprehensive treatmenton cutaneous region for low back pain.
Methods: One hundred and twenty outpatients with low back pain who met the diagnostic criteria were randomly divided into a cutaneous region group or a medication group, 60 cases in each group. The cases in the cutaneous region group were treated by Nie-pinching up the skin of the lumbosacral region, cupping and acupuncture. Those in the medication group were treated by oral administration of Celecoxib capsule. The visual analogue scale (VAS) and Oswestry disability index (ODI) were used to assess the therapeutic effects.
Results: After treatment, the VAS scores of both groups were different from those before treatment, showing statistical significances (allP<0.01). The D-valuse of VAS scores of both groups were different from those before treatment, showing statistical significances (allP<0.01). The D-value of OID scores in the cutaneous region group was significantly different from that in the medication group(P<0.01). After treatment, the total effective rate was 91.7% in the cutaneous region group versus 76.7% in the medication group, there was a significant difference in comparing the clinical effect (P<0.01).
Conclusion: Both comprehensive treatment on the cutaneous region and Celecoxib capsule can obviously relieve low back pain. But comprehensive treatment on the cutaneous region is better than Celecoxib capsule in the therapeutic effects.