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Objective:To evaluate the effect of occlusal adjustment on the restoration of the idiopathic cervical lesions.Methods:295 teeth with dental idiopathic cervical lesions in 83 patients were divided into 2 groups,142 teeth with occlusal interference were included in group 1 and the 153 without occlusal interference in group 2.The deffects of all the teeth were filled with Z350 nano-resin and followed up for 2 years.Then the teeth with treatment failure were divided into the experimental group (A,30 from group 1 and 14 from group 2) and the control group(B,30 from group 1 and 15 from group 2).The idiopathic cervical lesions of all teeth were filled with Z350 nano-resin,the occlusion of the corresponding teeth in group A was adjusted at the same time,that of group B was not treated.The cases were followed up for 1 year.Results:The success rate of group 1 and group 2 was 57.75％ and 81.05％ repectively (P ＜ 0.05).A subsequently treatment and 1 year follow-up showed that the success rate of gorup A and B for the cases with treatment failure of group 1 was 83.33％ and 56.67％ (P ＜ 0.05),for group 2 was 85.72％ and 40％ (P ＜ 0.05) respectively.Conclusion:The occlusal adjustment is benefit to the clinical effect of the treatment outcome of idiopathic cervical lesions.
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BACKGROUND:Biomechanical compatibility is the necessary condition to ensure the stable osseointegration with implants that then can function over a long period; therefore, it is especialy important to get knowledge about distribution of stress and strain between the maxilary central incisor and its surrounding bone tissue. OBJECTIVE: Based on five different anatomical types of natural teeth, to study the regularity of stress distribution between the maxilary central incisor root and implant.METHODS: According to the five different anatomical types of natural maxilary central incisors, UGNX and ANSYS were used to set up three-dimensional finite element models (B1, B2, M1, M2, P1) for the implant and surrounding structures, which were under 100 N static load at angles of 0o, 30o, 45o, 60o, 90o with the long axis of teeth. Then, the stress distribution between the five kinds of maxilary central incisor roots and implants was analyzed. RESULTS AND CONCLUSION:Among the five different anatomical types, the equivalent stress for both the natural central incisor and implant were increased with the increasing of angles, and the implant had a higher raising trend. The equivalent stress for the natural tooth concentrated upon B1 for the maximum value and M1 for the minimum value; while the equivalent stress for the implant focused on the maximum value at M1 and the minimum value at M2. There was a gap of 2%-31% between the equivalent stresses for the natural tooth roots and a gap of 4%-21% for the implants. The stress distribution range for the implant was just smaler than that for the natural tooth roots. It implies that the bit force of implant and natural tooth is in positive proportion to the bite angles, and the bite force that implant can burden is smaler than that the central incisor can.
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Objective The study aimed to compare the vector system with the hand instrument in the pain severity during scaling and root planning.Methods 60 periodontal patients were randomly divided into two groups for supportive periodontal therapy (SPT):the experimental group (using vector system) and the control group (using gracey instruments),with 30 cases in each group.And the painfulness after SPT was evaluated by Visual Analogue Scale (VAS).Results 66％ patients felt mild pain during the supportive periodontal therapy with the application of vector system,while 36％ patients felt mild pain in the control group.24 patients in the experimental group accepted vector system for SPT and 23 patients in the experimental group felt less fear of the treatment.Conclusions Patients will feel less discomfort with the application of the vector system,therefore better compliance will be reached.And the cooperation of the doctors and nurses has great impact on the treatment effect.
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Objective To evaluate the value of spiral CT and panoramic radiographs in preoperative assessment the jaw condition of patients for dental implantation.Methods 80 patients required dental implant restoration,these patients were Manned by CT and panoramic radiographs in preoperative,then selected suitable patients for dental implant restoration,reconstructed the jaw based on spiral CT data and guided the dental implant design and implanration.Results The spiral CT examination could be more accurate selection criteria for the patients needed dental implant restoration and more accurately showed the situation of edentulous ridge bone.Conclusion The reconstructed of three-dimensional imaging of spiral CT could precisely show the bone situation in the jaw needed dental implant and the important anatomic structures,could effectively assist denture design and the direction and depth of dental implants.was more superiority than panoramic radiographs.
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<p><b>OBJECTIVE</b>To study the effect of piezosurgery in the extraction of mandibular impacted third molars.</p><p><b>METHODS</b>228 mandibular impacted third molars with relative difficulty for extraction according to the scheme of degree of difficulty for extraction were included in the study, and were divided into two groups (114 teeth each group): Test group (treated by piezosurgery), control group (treated by traditional chisel osteotomy). The surgery time and pain, restriction of mouth opening and facial swelling after surgery, were evaluated in both groups.</p><p><b>RESULTS</b>The average surgery time was (16 +/- 5.2) min in test group and (30 +/- 8.7) min in control group. The surgery time, pain, facial swelling rate, and restriction of mouth opening were lower than control group (P<0.05).</p><p><b>CONCLUSION</b>Compared with traditional chisel osteotomy, the average surgery time with piezosurgery was significantly shorter and the complications are obviously reduced.</p>
Subject(s)
Adult , Female , Humans , Male , Mandible , Molar, Third , Osteotomy , Piezosurgery , Tooth Extraction , Tooth, ImpactedABSTRACT
Objective To make a summary of the clinical application and cooperation of piezosurgery in jaw bone tumour operation. Methods 64 patients with jaw bone tumour were selected since 2007 and were divided into the piezosurgery group and the routine group, they used piezosurgery and routine osteotome respectively. Feelings during operation, operation time, hemorrhage, postoperative reaction and complication were observed and compared. Results Discomfort and hemorrhage during operation was lighter, but operation was longer in the piezosurgery group compared with the routine group. Complications such as postoperative infection, hemorrhage and nerve damage did not occurred. Conclusions Application of piezosurgery in jaw bone tumor operation can increase comfort degree and reduce hemorrhage, it requires proficiency in operation procedures and master key aspects of nursing, so that can cooperate well.
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BACKGROUND: It is difficult to culture human dental pulp cells in vitro. Studies regarding effects of growth factors on proliferation and differentiation of dental pulp cells cultured in vitro have been reported. However, little is known about the Chinese herb rhizoma drynariae decoction on dental pulp cells cultured in vitro.OBJECTIVE: To observe the effects of different concentrations of rhizoma drynariae decoction on the proliferation and differentiation of human dental pulp cells cultured in vitro.DESIGN, TIME AND SETTING: A controlled observation was performed at the Scientific Resaarch Center, Fourth Hospital, Hebei Medical University between March 2006 and May 2007.MATERIALS: Human dental pulp cells were sourced from the patients who acquired orthotherapy through pulling out impacted wisdom tooth at the Department of Stomatology, Fourth Hospital, Hebei Medical University. Written informed content of sample collection was obtained from all patients. Rhizoma drynariae (place of production: Yunnan Province in China) was provided by the Dispensary of Traditional Chinese Medicine, Fourth Hospital, Hebei Medical University.METHODS: Human dental pulp cells were cultured in vitro using method of tissue piece. The effective ingredients of rhizoma drynariae were extracted by alcohol deposition. 1 mL of physic liquor contained 1 g crude drug and diluted into 10, 50, 100, 500, and 1000 mg/L culture medium utilizing fetal bovine serum. Subsequently, the prepared culture medium was used to culture human dental pulp cells in vitro. Cells that were cultured using culture medium without rhizoma drynariae decoction were used as controls.MAIN OUTCOME MEASURES: ①Primary culture and source identification of human dental pulp cells. ②Effects of different concentrations of rhizoma drynariae decoction on proliferation of human dental pulp cells by methyl thiazolyl tetrazolium (MTT) assay. ③ Effects of different concentrations of rhizoma drynariae decoction on fibronectin expression in human dental pulp cells by immunohistochemistry. ④ Effects of rhizoma drynariae decoction on ultrastructure of human dental pulp cells utilizing scanning electron microscope and transmission electron microscope.RESULTS: Primarily cultured human dental pulp cells displayed polygon- and shuttle-shaped appearance. Different concentrations of rhizoma drynariae decoctions, in particular 100 mg/L, exhibited proliferation-promoting effects on proliferation of human dental pulp cells, and could induce dental pulp cell synthesis and secrete fibronectin. Electron microscopy results revealed that following treatment of rhizoma drynariae decoctions, human dental pulp cells were found with abundant ridges on their surface, surround by extracellular matrix, cytoplasm full of abundant rough endoplasmic reticulum and dissociative ribosome, as well as evenly dispersed nuclear euchromatin, and occasionally seen heterochromatin.CONCLUSION: 100 mg/L rhizoma drynadae decoction apparently promotes the proliferation of human dental pulp cells cultured in vitro.
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Objective To examine the effect of oral external suction on environmental pollution of microorganism in dental clinic.Methods Aerobe was counted na observation index of air contamination and air sample of the area leveal 1m and 2.5 m,hight 1m,which using oral cavity collectors of aspirator or not was collected by the method of sedimentation.Results The datum of the group with oral cavity collectors of aspirator was much lower than the group without it.Conclusion Environmental pollution from tooth treatment in dental clinic can be reduced by using oral extemal suction.