The core issues of the subject of occlusion is the occlusal contact relationship of the maxillary and mandibular dentitions, and also the mandibular position. Occlusion reconstruction is a kind of treatments aiming to the rehabilitate the dental contact relationship at the appropriate mandibular position by means of prosthetic methods. Its indications focused on the patients who have quite a lot of natural teeth but lose the stable occlusal contact condition that requires a reestablishment. The periodontal feedback mechanism of the remained natural teeth exposes the occlusion under reconstruction to an environment with active and complex moderation of the neuromuscular adjustment that requires a higher level of the patients’ adaptation. In this article, we will focus on the topics of the mandibular position and occlusion contact features, which are obtaining the accurate mandibular position and establishing a stable contact relation. The former is the base and the latter is the target of occlusion reconstruction.
Objective To evaluate the fatigue resistances of glass fiber reinforced composite resin (GFRCR) space maintainers and to compare the fatigue resistance of GFRCR space maintainers made of two different kinds of composite resins.Methods 40 extracted human molars were selected. Samples were randomly divided into two groups (n = 20). Space maintainers in group A were made of Z350 composite resin, while space maintainers in group B were made of Grengloo composite resin. All the specimens were exposed to temperature alternating between 5~55 ℃. Then they were placed on the cyclic loading machine to bear cyclic loading and the number of loading times were recorded. The results were compared with standard fatigue strength.Results The fatigue resistances of two groups were higher than standard fatigue resistances (P < 0.001). The fatigue resistances of two kinds of space maintainers showed no difference (P = 0.886).Conclusion According to the fatigue resistances, GFRCR space maintainers can be clinically used. There were on differences between two kinds of materials in making GFRCR maintainers.
Objective To study the expression of LncRNA TUG1 in tongue squamous cell carcinoma (TSCC), and explore its function in the development of TSCC.Methods Fresh samples of TSCC tissues and corresponding adjacent normal tongue tissues were obtained from 19 cases, and the expressions of TUG1were detected by Q-PCR. The expression of TUG1 in CAL27 cell line were down-regulated by siRNA technology, and the cell proliferation ability after transfection was analyzed by MTT assay. The expressions of iNOS gene were rated by Q-PCR.Results Result of Q-PCR revealed the expressions of LncRNA TUG1 were up-regulated in TSCC tissues compared with the adjacent normal tongue tissues (P < 0.001). Cell proliferation ability was inhibited after down-regulation of TUG1 by siRNA technology, and the inhibition rates of 24/48/72 hour were 14.16％. 16.96％ and 21.40％ respectively. The relative expression of iNOS in blank/control/experimental groups were 1.000 ± 0.034, 0.974 ± 0.045 and 0.729 ± 0.039 respectively, and iNOS was down- regulated significantly in the experimental group (P = 0.002).Conclusion LncRNA TUG1 may have functions as a cancerogenic substance in TSCC via pormoting the expression of iNOS.
Objective To compare the effect of different timing of post space preparation on apical microleakage of fiber posts.Methods A sample of 30 human mandibular first premolars with single root canal was collected. They were prepared with Protaper system by the crown-down technique and obturated with gutta-percha + AH-plus by warm vertical condensation technique. The teeth were randomly assigned to three groups (n = 10/group). Group A, immediate post space preparation. Group B, delayed post space preparation after two days. Group C, delayed post space preparation after seven days. All the specimens were dyed with India ink and transparented, and then the apical permeated lengths were measured under microscope. And t test statistical analysis were conducted.Results The mean apical permeated lengths of the three groups were all slight, and were (0.96 ± 0.15) mm in group A, (0.97 ± 0.11) mm in group B, (1.01 ± 0.12) mm in group C, respectively. There was no significant difference between the two groups (P>0.05).Conclusion Different timing of post space preparation caused no significant differences on apical microleakage of fiber posts.
Objective To compare the intraradicular bacterial community structures in under-filling teeth with or withoutperiapical infection.Methods The intraradicularbiofilm samples were collected from under-filling teeth with periapicalinfection (apical periodontitis group, 3 teeth) and underfilling teeth withoutperiapical infection (non-apical periodontitis group, 2 teeth). The V3, V6 hypervariable regions of bacterial 16S rRNA genes were amplified, and the high-throughput sequencingwasperformed. Thecomposition and structure characteristic of intraradicular microbiota were revealed by bioinformatics analysis.Results The microbiotain apical periodontitis group comprised of Firmicutes, Proteobacteria, Actinobacteriad and others, total 22 phyla. While the microbiotain non-apical periodontitis group comprised of Firmicutes, Proteobacteria, Actinobacteria and others, total 8 phyla. The complexity of the microbiotain apical periodontitis groupwas significantly higher than without apical periodontitis group, but both groups comprised thesimilar most representivephyla.Conclusion The diversity of intraradicular bacterial community in underfillingteeth with apical periodontitis was higher than those in non-apical periodontitis.
Objective To evaluate the clinical effect of CAD/CAM zirconia and IPS e.max Press in all-ceramic fixed partial dentures in anterior or premolar area.Methods Patients aged 20~60 years old with the lack of the anterior teeth or the first permanent molars and with 3 unit fixed bridge repair were selected. They were randomly divided into CAD/CAM zirconia and IPS e.max Press groups. 3, 6, 12 months after the restoration resoectively, clinical observation of occurrence of falling off, fracture, fracture porcelain, the edge of the restoration body and the gum performance were evaluated by the Reference to the American Public Health Association’s revised criteria. All the data were analyzed statistically.Results With the extension of time, the success rate of the two kinds of all ceramic materials was decreased. The survival rates of two groups were all 90% above and there was no significant difference between the two groups.Conclusion CAD/CAM zirconia and IPS e.max Press all-ceramic systems can achieve good results under the premise of strict control of clinical indications.
Objective To compare the clinical results of thin porcelain laminate veneer and conventional porcelain laminate veneer.Methods 20 patients were restored with 72 thin porcelain laminate veneers, and 45 patients were restored with 120 conventional porcelain laminate veneers. Clinical reevaluations were performed 3, 6, 12, 24 and 36 months after insertion of the veneers according to the modified USPHS-criteria. Survival-rate and success-rate were recorded.Results After an observation period up to 3 years, thin porcelain laminate veneers and conventional porcelain laminate veneers showed good clinical results in terms of secondary caries, marginal adaptation, marginal discoloration, color match and anatomic form. Both the survival-rate and success-rate were above 90%, and no significant differences were found between the 2 veneer groups with the correction for continuity Pearson 's χ 2 test (P > 0.05).Conclusion Thin porcelain laminate veneer could obtain the same clinical results as conventional porcelain laminate veneer, however the indications should be selected properly and a higher level of operation technique is also required. A long period of clinical results remains to be observed.
Objective To assess clinical effect of replantation in avulsed immature permanent teeth.Methods 30 avulsed permanent teeth with immature apex treated following the International Association of Dental Traumatology treatment guidelines from July 2008 to June 2009 were analyzed in the retrospective study. The healing outcomes were classified into 4 categories：normal periodontal ligament healing, surface resorption, ankylosis and inflammatory resorption.Results The rate of normal periodontal ligament healing, surface resorption, ankylosis and inflammatory resorption were 23.3%, 3.3%, 43.3%, and 30.0％ respectively.Conclusion Traumatic injuries that result in ankylosis and inflammatory resorption of the permanent teeth in growing child leave the practitioners with many considerations to make the most appropriate treatment plan.
Objective To compare the effects of three kinds of anesthesia method in ankylotomy.Methods A total of 176 children of ankyloglossia were randomly divided into Ketamine basal intravenous anesthesia group (group A), intubation anesthesia group (group B), and sevoflurane inhalation anesthesia group (group C). The induction time, recovery time, HR, RR, SpO2, the degree of jaw joints relaxation and adverse reactions was recorded.Results There was no statistical significant difference in HR, RR and SPO2 between the three groups; The induction time of group A was significantly longer than group B and C. Recovery time of group C was significantly shorter than group A and B. Group A had higher incidence of respiratory depression and laryngospasm and had lower incidence of jaw joints relaxation than other two groups. The incidence of nausea and vomiting was significant lower in group C than in other two groups, but the incidence of agitation during recovery was significant higher than group B.Conclusion Sevoflurane inhalation anesthesia by mask in ankylotomy is safe and effective for the ankyloglossia children, but need to prevent the incidence of agitation during recovery.
Objective To study the clinical effect of medical collagen sponge in the prevention of postoperative complications after extracting mandibular impacted teeth.Methods 100 cases bilateral extraction of mandibular third molar were required as the objects of the study. Patients were randomly divided into two groups. In test group medical collagen sponge was implanted after tooth extraction, while the control group extraction did not put in any drug. The tooth socket was examined in 30 min and 7 d respectively.Results Low incidence of bleeding, swelling, limitation of mouth opening and dry socket occurred in the test group, which is statistically significant with the control group (P < 0.05).Conclusion Medical collagen sponge can reduce the incidence of postoperative complications of impacted mandibular third molar extraction.
Objective To evaluate the effect of the comprehensive intervention of the oral health education for children aged 6 to 12 years.Methods The oral health knowledge questionnaire was used to evaluatethe children′s awareness about oral health and the correct rate of tooth-brushing before and after 12-month comprehensive intervention. Two organizational forms about pit and fissure sealant were adopted. In city school, students were brought by their parents to the hospital to do pit and fissure sealant, while in rural school, hospital medical team went to schools to do pit and fissure sealant for the students. Compare the sealants retention rate in 12-month follow-up between two forms. The total sealants retention rate among 6-month, 12-month and 24-month follow-up were compared.Results Before and after oral health education guidance, the rate of children′s oral health awareness was 68% and 96%, and the correct rate of tooth-brushing was 64% and 92% respectively (P<0.05). There was statistical difference before and after comprehensive intervention. The rate of pit and fissure sealant was 84.02% in city school and 97.98% in rural school and the sealant retention rate in 12-month follow-up was 86.75% and 85.29% respectively(P<0.05). The total sealants retention rate among 6-month, 12-month and 24-month follow-up were 92.01%, 86.02%, and 82.14% respectively (P<0.05).Conclusion The oral comprehensive intervention is helpful to improve the children′s awareness about oral health.
The gingival recession in the population has a high incidence, which leads to the root surface exposure, tooth sensitivity, and serious impact on the appearance. At present, the gold standard surgery for clinical treatment of gingival recession is the coronal advanced flap + subepithelial connective tissue graft, which can significantly improve the gingival recession. However, there is a big problem in the treatment of the donor site. Now there are a lot of materials which are used to replace the subepithelial connective tissue. In this article, we review the substituted materials of the subepithelial connective tissue.
Based on the ecological theory, dental caries is a bacterial disease resulted from the imbalance of oral commensal microorganisms and it needs ecological methods to control. Due to its ability of regulating oral micro-ecological balance, bacteriotherapy has been regarded as a potential method to prevent dental caries, especially for children. The purpose of this review is to summarize the currently available data on probiotics of caries prevention in children.
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