OBJECTIVETo analyze the characteristics of cases of maxillary complex injury, to sum up experiences and lessons in the clinical first aid process, to evaluate different treatment effects of maxillary complex fracture and investigate the reasons for the failure of the treatment process.

METHODS152 cases with maxillary complex injury were analyzed retrospectively.

RESULTS2 cases (1.32%) died during emergency treatment. The cure rate was 62.67% (94/ 150) in the 150 survival cases. The cure rate of closed fractures were better than open ones and surgical treatments than non-surgical ways (P < 0.05); the cure rate of surgical treatment in stage I was higher than II (P < 0.01).

CONCLUSIONFor patients with complex injuries of maxillary, first aid failure is mainly due to bleeding or asphyxiation. Therapeutic efficacy is influenced by treatment time, surgical approach, type of treatment and so on. The key to success of treatment is dependent on the early firm internal fixation and the functional protection and restoration of injured organs or tissues.

Fracture Fixation, Internal ; Humans ; Retrospective Studies

OBJECTIVETo investigate the relationship between the uncooperative behaviors of first-visit-dental children and correlative factors that include children's temperament, severe of dental caries and so on in order to help dentists to make personal dentistry therapy plan for each child to prevent and deal with children's uncooperative behaviors.

METHODSFrom the pediatric dentistry clinic, 195 first-visit-dental children (aged 3-7 years) from Dec. 2007 to Dec. 2008 were randomly selected to accept dental examination and accepted corresponding treatment according to personal therapy plans. Children's clinic behavior was valued during treatment. The parents were asked to complete NYLS temperament parents scale questionnaires for 3-7 years old children.

RESULTSAmong the 195 children, there were 114(58.46%) had dental fear and anxiety(DFA) and 66 (33.85%) had dental behavior management problem (DBMP). As the children's age increased, the incidence of DBMP decreased. There were no statistical relationship between genders and children's DFA/DBMP. The children's severity of dental caries was related to their dental behavior, the more serious the caries, the more incident the DFA/DBMP of children. There were no statistically significant differences for the DFA/DBMP of temperament type children. But the score of sensory threshold was higher in DFA children, while physiological rhythmicity was lower in DBMP, the differences were significant.

CONCLUSIONIn order to reduce the incidence of DFA/DBMP, we should pay more attention to children with serious caries, and provide them individual behavior management for different ages and temperament.

Ambulatory Care Facilities ; Child ; Child Behavior ; Child, Preschool ; Dental Anxiety ; Dental Care ; Dental Caries ; Female ; Humans ; Male

OBJECTIVETo study the effects of two different endodontic sealers on the bond strength of two fiber posts cemented with adhesive resin cement.

METHODSTwenty-eight crownless human maxillary central incisors were prepared with the step-back technique and randomly divided into four groups according endodontic sealer and fiber: Group A, Cortisomol sealer+Matchpost fiber post; Group B, Cortisomol sealer+Macrolock fiber post; Group C, Guttaflow sealer+Matchpost fiber post; Group D, Guttaflow sealer+Macrolock fiber post. One week after fiber posts were bonded, a thin-slice push-out test was performed in a universal machine. Morphologic structure of the root canal dentin surfaces etched and the adhesive interfaces were examined by scanning electron microscopy (SEM).

RESULTSThe bond strengths of 4 groups were (7.06 +/- 3.22), (9.31 +/- 3.61), (6.90 +/- 3.13), (9.71 +/- 3.42) MPa. The bond strengths of group B and D were significantly higher than that of group A and C (P < 0.05). There was no significant difference between group A and C, group B and D (P > 0.05). The cervical third had the highest mean push-out bond strength, next to middle third and apical third (P < 0.01). SEM showed that larger numbers of the dentin tubules were open after the root canals were etched and penetration of resin tags into the dentinal tubules increased in the coronal root region when compared with the apical root region.

CONCLUSIONThe shear bond strength doesn't have relationship with endodontic sealers. The serration significantly increases the retention of fiber post. The bond strengths are different at the three root segment sites.

Dental Bonding ; Dentin ; Dentin-Bonding Agents ; Dimethylpolysiloxanes ; Drug Combinations ; Gutta-Percha ; Humans ; Incisor ; Post and Core Technique ; Resin Cements ; Root Canal Therapy ; Tooth Root ; Zinc Oxide-Eugenol Cement

OBJECTIVETo explore the incidence, influence factors and treatment methods of oral mucositis (OM) following hematopoietic stem cells transplantation (HSCT).

METHODSA clinical analysis about the total 71 OM cases occurring after HSCT among 166 patients in Peking University People's Hospital during 2009 was completed.

RESULTSThe healing rate of OM was 95.77% and the average healing time was (17.61 +/- 8.36) d after HSCT. There were no obvious effects of gender, age, HLA matches, conditioning regimen to the healing time of OM (P > 0.05).

CONCLUSIONGender, age, HLA matches and conditioning regimen have no obvious effects on healing time. By given timely and effective treatment, the incidence of OM can be reduced and even severe OM can also be well cured.

Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells ; Humans ; Stomatitis ; Transplantation Conditioning ; Treatment Outcome

OBJECTIVETo assess the efficacy and safety of hyaluronate sodium (HS) for internal derangement of temporomandibular joint by means of systematic review on relevant randomized controlled trials.

METHODSAfter identifing the study question of the efficacy and safety of HS for internal derangement of temporomandibular joint, Medline, Cochrane Controlled Trials Register, EMBASE, OPEN SIGLE and CBM were searched electronically till October 3rd 2010. Hand-searching covering 19 dental journals in Chinese were also performed. Risk of bias assessment, with Cochrane Collaboration's tool, and data extraction of included studies were conducted by two reviewers in duplicate. Meta analysis was done with Revman 5.0.23 and the quality of evidence was evaluated by GRADE.

RESULTS10 randomized controlled trials met the eligibility criteria and were included. All these studies had unclear risk of bias. When compared with negative control, HS showed a significant advantage on maximal mouth opening in short and long-term (P < 0.05), and clinical overall assessment in short-term (P < 0.05), but its effect on pain control and long-term effect on clinical overall assessment had no extra benefit (P > 0.05). Additionally, when compared with glucocorticoids, the participants who received HS injection would get a better clinical overall assessment in short-term and less adverse drug reactions (P < 0.05), but presented a similar temporomandibular joint pain relief and maximal mouth opening (P > 0.05).

CONCLUSIONTo a certain extent, HS had good efficacy and better safety than controls when treating internal derangement of temporomandibular joint. However, as the quality of some included studies were limited, more randomized controlled trials are needed to reinforce the conclusion.

Glucocorticoids ; Humans ; Hyaluronic Acid ; Temporomandibular Joint

OBJECTIVETo study the electrochemical corrosion behavior of Co-Cr, Ni-Cr and Ni-Cr-Be based porcelain alloys in NaCl solution.

METHODSFive samples of each alloy were made respectively, electric polarization curve of each alloy was obtained using potentiodynamic polarization technique. Self-corrosion potential (E(corr)), self-corrosion current density (I(corr), passive region and transpassivation potential were tested. Microstructure and constituent was examined using scanning electron microscopy and energy dispersive spectroscopy.

RESULTSCo-Cr alloy possessed the most desirable corrosion resistance because of its integrated, homogeneous and compact passive film. The poor compactness of Ni-Cr alloy's passive film decreased its corrosion resistance. Ni-Cr-Be alloy exhibited the worst corrosion resistance due to the Cr and Mo depleted Ni-Be eutectic phases in the alloy.

CONCLUSIONTaking biological security into consideration, it is necessary to avoid the application of porcelain alloys with Be element. Co-Cr alloy with better biocompatibility possesses much broader prospect in the field of dental restoration.

Alloys ; Chromium Alloys ; Corrosion ; Dental Alloys ; Dental Porcelain ; Microscopy, Electron, Scanning ; Nickel ; Surface Properties

OBJECTIVEThe aim of this study was to investigate the korrosionsneigung of three metal specimens for casing removable denture by means of electrochemical method.

METHODSThree kinds of test specimens were prepared, including cobalt-chromium alloy, nickel-chrome alloy with titanium and pure titanium. Then they were analyzed via linear polarization in artificial saliva simulating oral environment. From this electrochemical test the polarization curves of these kinds of specimens were recorded. Then the scanning electron microscope (SEM) and X-ray diffractometer (XRD) were applied to assess the morphology and phase changes before and after electrochemical corrosion.

RESULTSNo typical Tafel curve had been recorded for pure titanium, other than cobalt-chromium alloy and nickel-chrome alloy with titanium. Nickel-chrome alloy with titanium got more negative corrosion potential and higher corrosion current than cobalt-chromium alloy. Via SEM, the obvious changes were observed on the morphology and phase before and after corrosion on cobalt-chromium and nickel-chrome alloy with titanium specimens while pure titanium having no change. The XRD provided us little changes on these all three materials.

CONCLUSIONThe results confirm that the korrosionsneigung of the studied cobalt-chromium alloy in artificial saliva is lower than that nickel-chrome alloy with titanium. Pure titanium is the most stable one of the three materials and is extreme hard to be etched.

Chromium ; Chromium Alloys ; Corrosion ; Dental Alloys ; Electrochemistry ; Nickel ; Titanium

OBJECTIVETo investigate the effect of different inner metal materials of porcelain-fused-to-metal (PFM) crown on periodontal tissue by means of measuring the level of soluble intercellular adhesion molecule-1 (sICAM-1) and interleukin-1beta (IL-1beta) in gingival crevicular fluid (GCF) after PFM restorations.

METHODS30 teeth were divided into three groups (Ni-Cr alloy group, Co-Cr alloy group and Au-Pt alloy group, 10 teeth each group), and restored by Ni-Cr alloy, Co-Cr alloy and Au-Pt alloy PFM crown according grouping. At the point of pre-restoration, 6-month and 12-month after cementation, the clinical parameters including plaque index (PLI), gingival index (GI) and gingival crevice depth (GCD) were detected, and GCF was collected from labial and lingual of mesial site and distal site. The level of sICAM-1 and IL-1beta were detected.

RESULTSAt the point of 6-month and 12-month after cementation, Ni-Cr alloy group showed significant difference for GI, GCD and all GCF indexes when compared to pre-restoration, Co-Cr alloy group and Au-Pt alloy group (P < 0.05). At the point of 12-month after cementation, Co-Cr alloy group showed significant difference for GI, GCD and all GCF indexes when compared to pre-restoration and Au-Pt alloy group (P < 0.05). All indexes have no significant difference for Au-Pt alloy group during the 12-month experiment times when compared to pre-restoration (P > 0.05).

CONCLUSIONNon-noble metal has bad effect on the periodontal tissue.

Chromium Alloys ; Crowns ; Dental Porcelain ; Gingiva ; Gingival Crevicular Fluid ; Humans ; Intercellular Adhesion Molecule-1 ; Interleukin-1beta ; Metal Ceramic Alloys ; Periodontal Index

OBJECTIVETo test the effects of different surface treatments on the adhesive strength between POPO fiber post and resin cement.

METHODS50 fiber posts were divided into 5 groups at random according to different surface treatments. Group A: Control group, no treatment. Group B: Silanization for 60 s. Group C: Etching for 30 s. Group D: Etching for 60 s. Group E: Etching for 120 s. Crowns of 45 fresh premolars were removed and assigned randomly to 5 test groups. After bonding and embedding the retentive force of the samples were tested by an universal testing machine. The morphology of the post surface was observed by a scanning electron microscope (SEM).

RESULTSThere were significant differences among the effects of different surface treatments on the adhesive strength between POPO fiber post and resin cement (P < 0.05). Group D showed the highest adhesivestrength (207.33 +/- 7.58) N. There was significant different between group D and E (P = 0.027), but there was not significant difference between group D and C (P = 0.112). Significant changes of post surface after different treatments were discovered by SEM. Surface roughness and area of fiber exposure increased.

CONCLUSIONThe adhesive strengths have been enhanced after conducting different surface treatments on the fiber posts.

Adhesives ; Dental Bonding ; Post and Core Technique ; Resin Cements ; Surface Properties

OBJECTIVETo study the influence of the quorum sensing inhibitor brominated furanone on Porphyromonas gingivalis (P. gingivalis) biofilm formation.

METHODSDoubling dilution method was used to determine the minimal inhibition concentration (MIC) of brominated furanone on P. gingivalis. Absolute ethyl alcohol added in P. gingivalis bacterial suspension was used as the negative control, while P. gingivalis bacterial suspension as blank control. The influences of 1/4MIC, 1/2MIC, MIC, 2MIC of brominated furanone on P. gingivalis biofilm formation were studied by the optical density determination and scanning electron microscope (SEM).

RESULTSFour groups of brominated furanone with different concentrations were shown to inhibit P. gingivalis biofilm formation. With the increased concentration of brominated furanone, optical density of P. gingivalis suspension decreased. The biofilm structures of 1/4MIC group, 1/2MIC group and MIC group were loose. Only scattered P. gingivalis cells but no biofilm structure was seen in 2MIC group.

CONCLUSIONBrominated furanone could inhibit P. gingivalis biofilm formation without the influence on bacterial growth. The future application of this chemical compound may provide a new possibility for the antimicrobial treatment of periodontal disease.

Biofilms ; Furans ; Porphyromonas gingivalis ; Quorum Sensing