[Intramuscular type of nodular fasciitis: a report of 3 cases and review of literature]

PURPOSE

To retrospectively analyze the clinical characteristics of impacted supernumerary teeth in 115 patients.

METHODS

One hundred and fifteen patients with im-pacted supernumerary teeth who were admitted to the Department of Oral and Max-illofacial Surgery of Hefei Stomatological Hospital were selected randomly. The age, sex, number of teeth, location, direction, clinical manifestation, anaes-thesia method and operation time were analyzed retrospectively, T test and Chi-square test were used to determine the statistical differences with SPSS 19.0 software package.

RESULTS

Among 115 patients, there were 176 impacted supernu-merary, most of them were in mixed dentition period (66.96%), the sex ratio was 2.29:1, and Most patients (59.1%) had one supernumerary tooth, followed by two supernumerary teeth(33.9%). Most supernumerary teeth were located in the middle of the maxilla (68.2%). Inverted ones were the most common (52.8%). The most common symptoms were delayed eruption, displacement, crowding, torsion and space of the adjacent teeth. 92.2% of patients underwent general anesthesia. The dee-per the locations of impacted supernumerary were, the longer the operation time was.

CONCLUSIONS

There are regional characteristics of supernumerary teeth in Hefei City, which can provide a reference for clinical diagnosis and treatment.

[Cytotoxicity of carboxymethyl chitosan zinc and peptide to human periodontal ligament cells]

PURPOSE

The purpose of this investigation was to study the cytotoxicity of carboxymethyl chitosan zinc and peptide to human periodontal ligament cells in vitro, in order to provide a reference for understanding materials' safety.

METHODS

The primary cells were obtained from human periodontal tissues and cultured. The cultured cells were identified by observing the shape under microscope and by immunocytochemical method. HPDLCs were cultured in different concentrations of the tested materials extract and the activity of cells was evaluated using CCK-8 assay. The cytotoxicity grade was determined in term of the cell relative growth rates. The concentration of the tested materials extract was 100%, 75%, 50% and 25% in group 1-4, respectively. The fifth group had no materials. All statistical analysis was performed using SPSS 17.0 software package.

RESULTS

The primary cells owned fibroblasts' shape. Immunocytochemical analysis showed the cells were stained positively to antibodies against vimentin, and negatively to antibodies against cytokeratin, which indicated that they were external embryo mesenchymal cell. The cell relative growth rates were more than 100%, no matter the concentrations of materials extract were. The cytotoxicity grade of CMC-Zn⁺-P was 0.

CONCLUSIONS

CMC-Zn⁺-P exhibits no cytotoxicity to HPDLCs in vitro, which meets the requirements of the national standard.

[Expression of OPG/RANK/RANKL in the rat dental pulp tissue of periodontitis combined with vascular calcification and its clinical significance]

PURPOSE

To study the expression and possible role of OPG/RANK/RANKLin the rat dental pulp of periodontitis combined with vascular calcification.

METHODS

Thirty-six male Wister rats were randomly divided into 4 groups: control group(group C), periodontitis group(group CP), vascular calcification group(group VDN) and compound group(group CP+VDN). Each group underwent corresponding management to establish animal model. When the model was successful, the maxillae including molars were sectioned, pulp tissue was examined by H-E staining; Immunohistochemical staining method was used to evaluate the expression and ratio of OPG and RANKL in pulp tissues. Statistical analysis was carried out using SPSS 19.0 software package.

RESULTS

The pulp tissue of group CP, VDN, CP+VDN showed varied degrees of damage, neutrophil infiltration, pulp vascular congestion, odontoblasts vacuolar changes, pulp necrosis by H-E staining, and the changes in CP+VDN group was the most significant, followed by CP group, VDN group. Immunohistochemistry showed OPG in pulp tissues in group CP, VDN, CP+VDN were significantly lower than that in normal group (P<0.05), and the expression in group CP+VDN was the least;Expression of RANKL in pulp tissues in group CP, VDN, CP+VDN were significantly higher than that in normal group(P<0.05)，and the expression in group CP+VDN was the highest. The ratio of OPG/RANKL in normal group was the highest, and the ratio in CP+VDN group was the lowest.

CONCLUSIONS

Periodontitis and vascular calcification can damage the pulp tissue, periodontitis compound with vascular calcification may aggravate the injury; OPG/RANKL/RANK system may play an important role in pulp tissue injury.

[Expression of core binding factor a1, bone morphogenetic proteins and osteopontin in the developing periodontal tissues of mice]

OBJECTIVE

To study the expression and interaction of core binding factor a1 (Cbfa1), bone morphogenetic proteins (BMPs) and osteopontin (OPN) in the developing periodontal tissues of mice.

METHODS

A mice developing periodontal tissues study model was created histologically by 5-27 day postnatal BALB/c mice, then the immunohistochemical localization of Cbfa1, BMPs and OPN in different developing stages were undertaken.

RESULTS

In early stage of postnatal mice periodontal tissues development, only BMPs expressed in dental follicle cells, though the signal was weak. When root was forming, all of them were expressed in periodontal ligament cells and cementoblasts, while only OPN in acellular cementum, cellular cementum and the surface of alveolar bone, Cbfa1 only in cellular cementum and BMPs was seen in neither acellular cementum nor cellular cementum.

CONCLUSION

Cbfa1, BMPs and OPN all involve in the development of periodontal tissues, while OPN is crucial for cementum.

[Expression of epidermal growth factor receptor in human periodontal ligament cells during their mineralization in vitro]

OBJECTIVE

To investigate the expression of epidermal growth factor receptor (EGFR) during the mineralization of human periodontal ligament cells (hPDLC) in vitro.

METHODS

Studies using specific antibodies to immunolocalize EGFR in the mineral differentiating hPDLC were undertaken to investigate the different expression during the inducing process. In situ hybridization and RT-PCR technique were used to investigate the transcripts encoding the protein of EGFR.

RESULTS

The results showed that immunocytochemical labeling gradually decreased following the elong of the induce time, downing to nearly negative at the 4th week and the signal of EGFR transcripts was weaker in the induced hPDLC than that in uninduced.

CONCLUSION

EGFR has a negative regulation function during the mineralization of hPDLC.

[Histological location of DMP1, OPN and BSP in cementum formation of mouse]

PURPOSE

To study the distribution of dentin matrix protein 1, osteopontin and bone sialoprotein during cementum formation and cementoblasts differentiation in mouse.

METHODS

Thirty six BALB/c postnatal mice were divided into four groups according to the developing stages, nine in each was subdivided into three parts randomly to examine the location of DMP1, OPN and BSP, a tooth developing study model was built and examined using histological methods correspondingly. PV two steps immunohistochemical assay was used to localize the distribution of the three regulatory factors timely and spatially. Repeated measures ANOVA and statistical analysis software of CMIAS were used to analyze the intensity of the dyed images.

RESULTS

There was a series expression of the three regulatory proteins. DMP1 was expressed in the dental follicle cells in day 5 of postnatal stages and negatively expressed when the cell began to differentiate; meanwhile, since day 10 and on OPN was positively located in cementoblasts until the root developed completely; but BSP was expressed in the same cell in day 15 to 20, and then decreased to be negative. There were significant differences statistically among the three factors in each stage observed in the study except OPN between day 15 and 25.

CONCLUSIONS

There are different locations timely and spatially among the three proteins, it hints that they play important different roles during the differentiation of cementoblasts and formation of cementum.