During oral treatment, accidental foreign body ingestion not only caused the psychological and physical damage to patient, but in severe case may endanger the patient’s life. This paper focus on this accidental situation by systematic review of literature, in order to alarm the dentists in terms of medical security.
Objective To study the correlation between coinfection of Epstein-Barr virus (EBV) and Porphyromonas gingivalis(Pg) and severity of maternal chronic periodontitis in pregnant women.Methods Saliva samples were collected from 36 pregnant women with chronic periodontitis and 36 pregnant women with healthy periodontal status. EBV was detected using nested polymerase chain reaction (PCR), Pg was detected using 16S rRNA based PCR. Clinical periodontal indices were recorded through periodontal examination. Correlation between the coinfection and severity of maternal chronic periodontitis were analyzed.Results The results showed no significant differences in prevalence of infection of EBV or Pg between pregnant women with chronic periodontitis and with healthy periodontal status (P>0.05). Contemporaneously, coinfection prevalence of EBV and Pg showed significant differences between two groups (P = 0.028). Coinfection of EBV and Pg showed significant association with bleeding on probing index (BOP) (P = 0.003). No significant associations were found between the coinfection and periodontal depth(PD) or clinical attachment loss (CAL) (P>0.05).Conclusion Relationship between coinfection of EBV and Pg and maternal chronic periodontitis needs further investigation.
Objective To explore the effect of heat treatments on the metal-ceramic bonding strength in Ni-Cr-Ti alloy and Ni-Cr alloy.Methods We evaluated the metal-ceramic bond strengths by using a three-points bending test according to ISO 9693. Meanwhile, we also observed the metal-ceramic interface through scanning electronic microscope(SEM) and energy dispersive spectrum (EDS).Results The mean value of bonding strengths of four groups were (38.04 ± 3.79) MPa (Ni-Cr-Ti, degassed), (32.17 ± 4.00) MPa (Ni-Cr-Ti, no heat treatment), (36.32 ± 7.41) MPa (Ni-Cr, degassed), (31.75±2.77) MPa (Ni-Cr, no heat treatment). The statistic analysis showed that the mean bonding strengths were affected significantly by heat treatment method (P = 0.001), but not alloy type (P = 0.484). SEM and EDS demonstrated that the bonding surfaces of degassed specimens were compacted and had no cracks unlike those of specimens not receiving heat treatment.Conclusion According to the test results, the metal-ceramic bonding strengths of Ni-Cr-Ti alloy and Ni-Cr alloy are close to each other, and the bonding strengths of alloys can be heightened by heat treatment.
Objective To investigate the expression of LASP-1 in tongue squamous cell carcinoma, and to study the influence of shRNA silent LASP-1 on cell proliferation and migration of tongue squamous cell carcinoma.Methods Green fluorescence shRNA targeting LASP-1 was constructed and transfected into SCC9 cells by lipofectamine. Cell proliferation was detected by MTT method. LASP-1 mRNA and protein were determined by RT-PCR and western blot respectively. The migration ability of cells was detected by transwell assay.Results There was green fluorescence expression in experimental and negative control group cells after transfecting shRNA and shNC respectively. LASP-1 mRNA and protein were decrease in experimental group cells. It indicated that LASP-1 shRNA was transfected successfully. By contrast with control group, the cell viability of experimental group cells reduced by (51.23 ± 1.47)% and (50.07 ± 2.11)% after 48 h and 72 h respectively. The results of transwell assay showed that migration ability of SCC9 cells was decreased significantly after shRNA targeting LASP-1 was successful transfected. It decreased by 43% compared with control group.Conclusion LASP-1 has high expression in tongue squamous cell carcinoma cells, down regulated LASP-1 gene expression can inhibit the proliferation and migration of SCC9 cells.
Objective To evaluate the effect of three different resin cement on fracture strength of cemented machinable IPS e.max CAD specimens and provide guides for clinical luting procedure.Methods Sixty human molars were collected, and occlusal enamel were removed; IPS e. max CAD blocks were processed into plate-shape and etched with 9.5% hydrofluoric acid. All specimens were randomly divided into three groups (n = 20) and received there different luting treatments, (group A: Multilink ? N+ Monobonds-S, group B: RelyX? Ultimate+ Scotchbond? adhesive, group C: RelyX? Unicem 2). Then each group were divided into two sub-groups (group 1: the control group, group 2 received thermal cycling). Fracture load was measured with a universal testing machine. The results were analyzed by two-way ANOVA and LSD test.Results Fracture load of each group were A1(1 763 ± 128)N、A2(1 563 ± 115)N、B1(1 861 ± 135)N、B2(1 676 ± 137)N、C1(1 446 ± 153)N、C2(1 038 ± 95)N. Significant differences of fracture load were observed among all groups (F = 52.279, P<0.001). Resin cement (F = 94.104, P<0.001) and thermal cycling (F = 63.818, P<0.001) affected the fracture load significantly. LSD test showed that significant differences of fracture load were observed among group A, B and C (P<0.05). Group B illustrated the highest fracture load where as group C demonstrated the lowest one.Conclusion Resin cement that treats the ceramic and dentin surface simultaneously will strengthen the fracture load of the glass ceramic. Thermal cycling will reduce the fracture strength of cemented glass ceramic.
Objective To investigate the application value of platysma myocutaneous flap in repairing the defect after resection of buccal carcinoma.Methods 40 patients (preoperative examination of regional lymph nodes showed no obvious metastases of buccal cancer) were selected during January 2008 to May 2014, 40 patients were divided into the observation group and control group equally and received the conventional implement buccal carcinoma resection and selective neck dissection. Observation group used platysma myocutaneous flap to repair the buccal defect, and the control group used forearm skin flap to repair the defect. After one year follow-up, the survival rate of the flaps, the neck activity after operation, and the opening degree of mouth were compared with these two groups.Results Compared with the control group, the survival rate of the observation group had no statistically significant difference (χ 2 = 0.013, P = 0.909). In the observation group, the flap surrounding the mandible had a significant lower incidence of distal necrosis than that without surrounding the mandible, and the difference was statistically significant (χ 2 = 3.429, P = 0.044). 1 years after the operation, the scar was softened, and there was no significant difference between the two groups. The mouth opening degree and buccal flap mucosal condition were ideal 1 year later, the difference was not statistically significant between the two groups (P > 0.05).Conclusion Platysma myocutaneous flap has good repairing effect for the preoperative defect in buccal cancer patients without dominant buccal and submandibular lymph node metastasis. It is especially suitable for the patients with missing teeth after resection of buccal lesions and patients who can not implement the free flap with high surgical risk. Compared with free flap, platysma myocutaneous flap has the advantages of small surgical trauma, good efficacy, simple operation and easy to carry out, it’s worthy of clinical promotion.
Objective To compare the the rate of en-masse space closure with sliding mechanics between 3M SmartClip self-ligating brackets and 3M Gemini MBT twin brackets in the first premolar extraction patients.Methods 20 Class I malocclusion patients who need first premolar extraction treatment were selected. One arch side of the second premolar and first molar were bonded with 3M self-ligating brackets and the other side bonded with Gemini MBT twin brackets. After leveling and alignment, 0.48 mm × 0.64 mm (0.019 inch × 0.025 inch) stainless steel wire and nickel titanium coil springs were used to close the space. An average rate of space closure per month (mm/month) was calculated in each side.Results The median rates of tooth movement for the SmartClip bracket side (1.03 mm per month) and the Gemini MBT twin brackets side (1.00 mm per month) were not significantly different (t = 0.70, P = 0.48).Conclusion There was no significant difference in the rate of en-masse space closure between SmartClip brackets and Gemini MBT twin brackets.
Objective To study the chin morphology of Cantonese with normal occlusion, and to establish the cephalometric database of the chin morphology for providing reference data for clinical orthodontic treatment and surgical treatment of Chin.Methods The lateral cephalometrics radiographs of 44 untreated samples (20 men, 24 women) were taken in natural head position, centric oclusion and lip relaxed position. The chin characteristic variables were measured by Winceph 7.0 software three times by one orthodontists. Mean and standard deviations of measurements were determined for each gender. The t-test was used to compare the values between males and females.Results The obtained data were statistically analyzed and compared between male and female. There are sex difference in M-Me to MP/ B-Me to MP and B′ to Li-Pog′ (mm). There is no sex difference in Chin curvature.Conclusion The normative data for the Southern Chinese should be uesd as a guide for diagnosis and treatment of chin deformities. The maxillofacial surgeon and orthodontist should consider the sex difference. Gender differences must be taken into consideration during orthodontic diagnosis and treatment planning for the individual patient.
Objective To evaluate the efficacy and related risk of low level laser therapy (LLLT) for accelerating tooth movement during orthodontic treatment.Methods An extensive electronic search was conducted by two reviewers. Randomized controlled trials (RCTs) and quasi-RCTs concerning the efficacy of LLLT for accelerating tooth movement during orthodontic treatment were searched in CENTRAL, PubMed, Medline, Embase, CBM, CNKI.Results Six RCTs and three quasi-RCTs, involving 211 patients from six countries, were selected from 173 relevant studies. All nine articles were feasible for the systematic review and meta-analysis, five of which were assessed as moderate risk of bias, while the rest were assessed as high risk of bias. The mean difference and the 95 % confidence interval (95 % CI) of accumulative moved distance of teeth were observed among all the researches. The results showed that the LLLT could accelerate orthodontic tooth movement in 7 days (MD = 0.19, 95% CI 0.02-0.37, P = 0.03) and 2 months (MD = 1.08, 95% CI 0.16-2.01, P = 0.02). Moreover, a relatively lower energy density (2.5, 5 and 8 J/cm 2) was seemingly more effective than 20 and 25 J/cm 2 and even higher ones. Conclusion This systematic review and meta-analysis demonstrated that LLLT might speed up the tooth movement in orthodontic treatment. A relatively lower energy density (2.5, 5, and 8 J/cm 2) was seemingly more effective than higher ones. More qualified RCTs in human subjects are required.
Objectives To analyze the effects of occlusal laser appliance when used by newly-graduated dentists, by measuring the occlusal rim namely the intersection angle between reference plane and occlusal plane, and comparing the results with Fox plane-guide.Methods The wax occlusal rims were fabricated on manikins by 15 newly-graduated dentists with Fox plane-guide and occlusal laser appliance respectively, and the occlusal rims were measured and compared.Results There was no statistically significant differences （t = 0.618, P = 0.542） between Fox plane-guide group （0.7 ± 0.3）° and occlusal laser appliance group （0.6 ± 0.4）° in the anterior area, while it was statistically significant （t = 3.302, P = 0.007） between Fox plane-guide group （3.1 ± 2.1）° and occlusal laser appliance group（1.4 ± 0.8）° in the posterior area. The intersection angles in occlusal laser appliance group were smaller than that in Fox plane-guide group.Conclusion It is effective to make occlusal rims with Fox plane-guide or occlusal laser appliance by newly-graduated dentists, and it is more efficient to use occlusal laser appliance for the posterior occlusal rims。
Objective To compare the clinical effects of minocycline hydrochloride ointment (Periocline) and lodine glycerin as adjuvant therapy for pericoronitis with parulis.Methods 164 college students suffering from pericoronitis with parulis were divided into 2 groups randomly: observation group (82 cases) and control group (82 cases). All cases were treated with incision and drainage of the parulis, and then pericoronal rinsing. What's more, tinidazole and cefradine plus compound borax gargle mouthwash were given to them. 2% Periocline was filled into the periodontal pocket for the observation group (q3d) while 1% lodine glycerin was filled into the periodontal pocket for the control group (qd). Clinical effects of the two groups were observed and compared 3 days later.Results The effective rate of observation group (93.9%) was higher than that of control group (78.0%) with statistically significance (χ 2 = 8.546, P = 0.003). No drug adverse reaction occured. Conclusion It shows good effects when Periocline is applied as an adjuvant therapy for pericoronitis with parulis.
Objective To investigate effect of Duraphat on preventing enamel demineralization during orthodontic treatment.Methods 58 patients underwent fixed orthodontic treatment were included. Maxillary teeth were divided into 2 groups at central incisors. The teeth on one side were randomly assigned as experimental group and the contralateral teeth were control group. After bonding, the teeth of experimental group were applied with Duraphat after brackets being bonded, while control group received no treatment. Duraphat was applied every 3 months. The occurrence of enamel demineralization was observed and documented in both experimental and control groups before treatment and in 6th and 12th month during treatment, and the enamel decalcification index was also calculated.Results With the extension of treatment time, enamel demineralization of control group increased gradually. While that of experimental group is no obvious. The rate and severity of enamel demineralization in experimental side were significantly lower than those of the control side (P<0.05).Conclusion Duraphat has effect on the prevention of enamel demineralization during fixed orthodontic treatment.
Fused teeth and talon cusp, usually are two separate dental anormalies affecting both primary and permanent dentitions. Fused teeth are more commonly in deciduous maxillary anterior teeth, while the talon cusp is more common in permanent maxillary incisors. Here is a rare case of talon cusp in fused teeth affecting permanent mandibular incisors. We discussed the etiopathogenesis and a possible hypothesis of these two anomalies in order to improve the awareness on the lesion and find out preventive measure to reduce the complications.
Living pulp is crucial for the maintenance of tooth homeostasis. An ideal form should consist of regenerative approaches, which necrotic pulp or diseased tissues are replaced with regenerated pulp tissues, and the tooth converts into vital in the end. With the development of tissue engineering, dental pulp regeneration becomes possible. This review will solve and discuss the problems of dental pulp regeneration from stem cells, scaffolds and growth factors.
Periodontitis is a destructive disease occurred in the inflammatory periodontal support tissues. In recent years, research in the microRNA (miRNA) with the occurrence of periodontitis aspect progresses rapidly. This article reviews the research progress on periodontitis and related microRNA.
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