Tooth extraction is a common operation in oral surgery. Traditional-extraction instruments, such as bone chisel, elevator, and bone hammer, lead to not only severe trauma but also unnecessary complications, and patients easily become nervous and apprehensive if tooth extraction is performed using these violent instruments. In recent years, with the develop- ment of minimally invasive concept and technology, various micro-power instruments have been used for tooth extraction. This innovative technology can reduce the iatrogenic trauma and complications of tooth extraction. Additionally, this technology can greatly decrease the patient's physical and mental pressure. The new equipment compensates for the deficiency of traditional tooth extraction equipment and facilitates the gradual replacement of the latter. Diverse micro-power systems have distinct strengths and weaknesses, so some auxiliary instruments are still needed during tooth extraction. This paper focuses on the various micro-power systems for tooth extraction and tries to compare the advantages and disadvantages of these systems. Selection and usage of auxiliary equipment are also introduced. Thus, this paper provides reference for the proper application of the micro-power systems in tooth extraction.
Humans ; Tooth Extraction ; instrumentation

The "Lübeck disaster", twins studies, adoptees studies, and other epidemiological observational studies have shown that host genetic factors play a significant role in determining the host susceptibility to Mycobacterium tuberculosis infection and pathogenesis of tuberculosis. From linkage analyses to genome-wide association studies, it has been discovered that human leucocyte antigen (HLA) genes as well as non-HLA genes (such as SLC11A1, VDR, ASAP1 as well as genes encoding cytokines and pattern recognition receptors) are associated with tuberculosis susceptibility. To provide ideas for subsequent studies about risk prediction of MTB infection and the diagnosis and treatment of tuberculosis, we review the research progress on tuberculosis susceptibility related genes in recent years, focusing on the correlation of HLA genes and non-HLA genes with the pathogenesis of tuberculosis. We also report the results of an enrichment analysis of the genes mentioned in the article. Most of these genes appear to be involved in the regulation of immune system and inflammation， and are also closely related to autoimmune diseases.
Humans ; Genome-Wide Association Study ; Tuberculosis/genetics* ; Gene Expression Regulation ; Cytokines/genetics* ; Autoimmune Diseases ; Mycobacterium tuberculosis/genetics* ; Genetic Predisposition to Disease

Objective To assess the diagnostic value of three-dimensional(3D) helical CT imaging in the cases of complex maxillofacial fractures and to discuss the clinical usefulness of 3D to surgeons.Methods 26 patients with trauma suspected of having complex facial fractures were examined with thin-slice CT scan and 3D reconstruction.Results The location,shape and displacement of fragment of complex maxillofacial fractures were demonstrated steroscopically by three-dimensional images reconstructed from helical CT.Conclusion 3D helical CT imaging can provide valuable information in demonstrating the space relationships of maxillofacial fractures.

Objective: To evaluate the prevention of postexodontic complications by oral tissue patch embedded in socket after tooth extraction. Methods:200 patients with impacted mandibular third molar were divided into two groups at random with 100 in each group. In group 1 the oral tissue patch was put into the sockets after tooth extraction. Group 2 was the blank control.Postexodontic complications of the two groups were observed after treatment. Results:Dry socket (DS) incidence rate in group 1 and 2 was 1% and 8%(P

0.05).Conclusion:Secnidazole is effective and safe in the treatment of pericoronitis.

Glucose ; administration & dosage ; Humans ; Irritants ; administration & dosage ; Joint Dislocations ; therapy ; Mandibular Condyle ; Recurrence ; Temporomandibular Joint ; injuries ; Temporomandibular Joint Disorders ; therapy

BACKGROUND: According to up-to-date development, the best timing to repair cleft palateis at 9-12 months old after birth when the articulation does not begin to develop.However, there are many over-eight-year-old children who still suffer from unrepaired cleft palate. Therefore, it is veryimportant to adopt proper surgery for these patients to improve palate form and articulatory function. OBJECTIVE: To study the characteristics of the cleft palate in patients of over 8 years old and the effects of palate repair and posterior pharyngeal flap transplantation (PPFT) on articulation. DESIGN:A controlled study with children patients as subjects. SETTING: Department of Maxillofacial Surgery, Medical College of Stomatology, Fourth Military Medical University of Chinese PLA PARTICIPANTS: Twenty-four children patients of cleft palate who were treated in the Department of Maxillofacial Surgery ,Medical College of Stomatology, Fourth Military Medical University of Chinese PLA from January 2000 through December 2003 were enrolled in the study. Fourteen were male and ten female. Their ages varied from 8 to 20 years old (mean 13.8 years). Three cases were bilateral complete cleft palate and twelve cases were unilateral complete cleft palate. Nine were incomplete cleft palate. METHODS :Two flap palatoplasty and upper pedicle PPFT were conducted in all the patients. In thirty days after surgical treatment, the patients were asked to repeat the words of a doctor in the phonetic lab with his or her lips 10 cm away from microphone. The words of the patients were recorded and evaluated subjectively by 5 doctors specialized in pathologic phones. MAIN OUTCOME MEASURES :The palatopharynx was observed with nasopharyngoscope before and after operation. And the improvement of nasal gas leakage and enhanced rhinophonia were also evaluated. RESULTS: The repaired cleft palate was healed in the first intention in all the patients. The soft palate retreated satisfactorily and the palatopharynx was apparently closed, which created good preconditions for articulation. The patients' articulation was also improved in different degrees. All the 24 patients had the fourth grade of enhanced rhinophonia and nasal gas leakage before repairing. After palate repair and PPFT, the enhanced rhinophonia and nasal gas leakage of grade 1 was in 3 patients, grade 2 in seven, grade 3 in six and grade 4 in eight patients. CONCLUSION: The combination of palate repair and pharyngoplasty is able to improve the form of soft palate and the articulation of over-eightyear-old patients with cleft palate.

Objective:To study the efficacy and safety of natural calcined bone repair material(NCBM)in repairing bone defect af-ter tooth extraction.Methods:A randemized,double-blinded,parallel,positive control(Bio-Oss)and multi-center clinical trial was employed.Imaging examination was used as the main efficacy evaluation index,surgical wound healing,rejection reaction,bone me-tabolic changes,bone infection signs were the subordinate efficacy evaluation indexes,the incidence of adverse reactions was observed for safety evaluation.Results:280 cases were included,269 cases completed the trial.In NCBMand Bio-Oss group the effective rate of imaging examination was 93.08% and 93.70%(P >0.05)respectively.The wound healing time of the 2 groups was less than 7 days,no rejection reaction,bone metabolic change and bone infection sign were observed.The incidence of adverse events in NCBM and the Bio-Oss group was 0.72% and 2.14%(P >0.05)respectively.Conclusion:The efficacy and safety between natural cal-cined bone repair material is not inferior to Bio-Oss in repairing bone defect after tooth extraction.

Objective: To observe the behavior therapy efficacy in dental fear patients for dental extraction using video eyewear and N_2O inhalation. Methods: 100 patients were divided into two groups, one group only used N_2O and other group used N_2O with video eyewear. Compared two groups′ Frankl behavior rating scale and Houpt scale after dental extraction. The HR and SpO_2 were measured during dental extraction. Results: Using video eyewear and N_2O showed a significant good sedative effect on patients with dental fear. There were statistical difference in the Frankl behavior rating scale and Houpt scale between experiment group and control group(P<0.01). There were no significant changes in heat rate and SpO_2 before and after in two groups. Conclusion: Video eyewear and N_2O inhalation sedation is good for dental fear patient during dental extraction.

Objective:To study the feasibility of extraction of impacted mandibular wisdom teeth using turbine drill and new instruments. Methods: 600 patients with impacted mandibular third molars were divides into 2 groups. A group used turbine drill and new instruments to extract the impacted mandibular third molar. B group used the dental chisel to extract the impacted mandibular third molar. The operation time, intraoperative and postoperative complications were recorded to assess the effects of the methods. Results: The operation time of group A and group B was (22.285±12.025 01) min and (16.115±12.078 62) min respectively. The operation time of group A was shorter(P<0.05). The intraoperative and postoperative complication incidence rate was lower(P<0.05). Conclusion: Turbine drill and new instruments method is superior to dental chisel method in the extraction of impacted mandibular wisdom teeth.