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Chinese Journal of Dental Research

Shan Jiang, Hao Wu, Cheng Fei Zhang
Pulpal necrosis of an immature permanent tooth with an open apex poses a challenge for the clinician. The conventional apexification technique using calcium hydroxide has yielded short-term success, but this technique has inevitable shortcomings. Hence, this case series aimed to evaluate the effectiveness of using bioceramics (iRoot BP) or mineral trioxide aggregate (MTA) for partial pulpotomies. Three boys aged 9 to 11 years old presented with partial pulp necrosis and symptomatic apical periodontitis of the mandibular right and left second premolar...
June 2016: Chinese Journal of Dental Research
Yong Liang Su, Xiao Yan Wang
OBJECTIVE: To investigate the inhibition of Enterococcus faecalis by calcium peroxide (CaO₂). METHODS: The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Enterococcus faecalis by CaO₂ and calcium hydroxide (Ca(OH)₂) were determined by direct exposure tests (n = 10). The inhibition zone of E. faecalis mycoderm treated with CaO₂ and Ca(OH)₂ paste (53% w/w) was observed using agar diffusion tests (n = 20). The inhibition of E...
June 2016: Chinese Journal of Dental Research
Ying Ying Zhang, Hua Xiang Zhao, Zhi Bin Chen, Jiu Xiang Lin, Yan Liu
OBJECTIVE: To investigate the effect of osteoprotegerin (OPG) on the cementoblastic activity of a clonal population of immortalised murine cementoblasts (OCCM-30) in vitro. METHODS: OCCM-30 cells were transiently transfected with the mouse OPG using the Avalanche transfection reagent. The ectopic expression of OPG was confirmed by enzyme-linked immunosorbent assay and quantitative polymerase chain reaction. The cell counting Kit-8 assay was used to investigate the effect of OPG on cell proliferation...
June 2016: Chinese Journal of Dental Research
Allahyar Geramy, Domingo Martin, Joseph Bouserhal, Elham Sadat Emadian Razavi, Mehdi Hassanpour
OBJECTIVE: To compare the influence of outer bow length difference and unilateral outer bow expansion on the 'asymmetric effect' of the headgear. METHODS: Twelve 3D finite element models of a headgear with two tubes were designed, which were similar except for the outer bow length or the degree of unilateral expansion in Solid-Works 2011. A 3N force was applied to the outer bow ends in ANSYS Workbench 12.1 and the distalising, lateral forces to molars, moments and the energy of the system were evaluated...
June 2016: Chinese Journal of Dental Research
Yang Wang, Zhen Wang, Guang Yan Yu, Zhan Gui Tang, Ji An Hu
OBJECTIVE: To investigate the effect of capsaicin cream on the secretion of the submandibular gland (SMG) and the parotid gland (PG) in the general population, with different chilli-eating habits. METHODS: In two groups with different chilli-eating habits, the salivary flow rate of the SMG and the PG was detected at statics and different times, after application of capsaicin cream. RESULTS: In both groups, the topical application of capsaicin cream could significantly increase the salivary secretion of SMG (P < 0...
June 2016: Chinese Journal of Dental Research
Rüdiger Saekel
OBJECTIVE: To propose new analytical tools that facilitate the obtention of quantifiable results for evaluating different dental care systems. METHODS: The paper describes the construction of a composite indicator that measures dental health on a population basis in one overall indicator, the Dental Health Index (DHI). If the DHI is combined with a Dental Care Cost Index, an efficiency index (EI) can be created. RESULTS: The use of these new instruments for analysing different dental care systems reveals that the Swedish and Danish populations enjoy the best dental health status, followed by US, Japanese, Australian and Canadian citizens...
June 2016: Chinese Journal of Dental Research
Yan Si, Yan Guo, Chao Yuan, Tao Xu, Shu Guo Zheng
OBJECTIVE: To explore the effectiveness of comprehensive oral health care to reduce the caries incidence for children with severe early childhood caries (s-ECC) in an urban area in China. METHODS: A total of 357 children aged 3 to 4 years old and diagnosed with s-ECC were recruited in this randomised controlled, single-blinded clinical trial for 1 year. Children of two different kindergarten classes were enrolled in this study and randomly divided into a test group (205 children) and a control group (152 children)...
March 2016: Chinese Journal of Dental Research
Qi Lin Wang, Pan Pan Yang, Li Hong Ge, He Liu
OBJECTIVE: To evaluate the use of platelet-rich fibrin (PRF) in the regenerative therapy of immature canine permanent teeth. METHODS: Eight immature premolars of beagle dogs were pulp extracted and cleaned with irrigation, then divided into two groups of empty root canals and those filled with a PRF clot. All of the eight premolars were sealed with mineral trioxide aggregate and glass ionomer cement. Two premolars were left naturally grown as a positive control...
March 2016: Chinese Journal of Dental Research
Yan Song Ma, Dong Yu Fang, Ning Zhang, Xue Jia Ding, Kun Ya Zhang, Yu Xing Bai
OBJECTIVE: To characterise and compare the tensile characteristics after multi-proportional blending, to determine the proper blending ratio for new thermoplastic material and to compare its mechanical performance with commercial thermoplastics. METHODS: PETG and PC2858 aggregates were blended in five different ratios. Standard specimens of each ratio were molded and tested to determine their mechanical performance. Then the new material with the proper blending ratio was chosen and compared against commercial thermoplastics...
March 2016: Chinese Journal of Dental Research
Rui Yun Bi, Yun Ding, Ye Hua Gan
OBJECTIVE: To investigate the association between the analgesic effect of non-steroidal antiinflammatory drugs (NSAIDs) and sodium channel 1.7 (Nav1.7) expression in the trigeminal ganglion (TG). METHODS: Temporomandibular joint (TMJ) inflammation was induced by complete Freund's adjuvant (CFA) in female rats. Ibuprofen, diclofenac sodium and meloxicam were given intragastrically before induction of TMJ inflammation. Histopathological evaluation and scoring of TMJ inflammation was used to evaluate the level of inflammation...
March 2016: Chinese Journal of Dental Research
Cheng Wang, Xi Qiang Liu, Jin Song Hou, Jian Ning Wang, Hong Zhang Huang
Oral cancer is an aggressive disease with the propensity for local recurrence and distal metastasis in the head and neck region. Currently, cisplatin-based chemotherapy or concurrent radiochemotherapy is still the first choice to treat the advanced stage cancers, in particular, the unresectable tumours. Unfortunately, innate and acquired resistance to chemotherapy agent greatly limited its effectiveness and often led to treatment failure in these patients. Hence, it is urgent to clarify the mechanisms underlying the development of chemoresistance in patients with oral cancer...
March 2016: Chinese Journal of Dental Research
Komal P Khot, Swati Deshmane, Sheetal Choudhari
Squamous cell carcinoma of the head and neck (HNSCC) has long been regarded as a disease entity having a remarkable incidence worldwide and a fairly onerous prognosis; thus encouraging further research on factors that might modify disease outcome. Squamous cell carcinomas encompass at least 90% of all oral malignancies. Several factors like tobacco and tobacco-related products, alcohol, genetic predisposition and hormonal factors are suspected as possible causative factors. Human papilloma virus (HPV), the causal agent of cervical cancer also appears to be involved in the aetiology of oral and oropharyngeal cancer...
March 2016: Chinese Journal of Dental Research
Alexander Chris Vlantis
The human papilloma virus (HPV) is a common virus that infects epithelium in 10% of the world's population. While most sexually active people become infected, the majority with a healthy natural immunity control their infection. When the infection becomes persistent in cervical mucosa for instance, it is associated with nearly all cervical cancers. Fortunately cervical cancer screening is both sensitive and specific and when accessed has led to significant reductions of this disease. Despite this, cervical cancer still remains one of the leading causes of death from cancer...
March 2016: Chinese Journal of Dental Research
Guang-Yan Yu
No abstract text is available yet for this article.
March 2016: Chinese Journal of Dental Research
Han Guo Wang, Ning Xu, Qing Yu
The separate distolingual (DL) roots of three-rooted mandibular first molars are thought to be too difficult for performing apical surgery. This article represents microsurgical treatment of a three-rooted mandibular first molar with a separate DL root. The procedure includes incision and flap retraction, osteotomy, apicoectomy, retropreparation and retrofilling of the root canal, using micro instruments, ultrasonic retrotips and mineral trioxide aggregate (MTA) under a dental operating microscope. Two mm in length of apical root resection, 2 mm in depth of root canal retropreparation with a personalised ultrasonic retrotip, and 2 mm in length of retrofilling with MTA are the key points for accomplishment of apical surgery on separate DL roots...
2016: Chinese Journal of Dental Research
Aoi Fukumoto, Takero Otsuka, Toshitsugu Kawata
The present report describes myofunctional therapy using a ready-made training device, the T4A, in patients with permanent dentition and its effect on the prevention of relapse. The buccinator mechanism maintains the inner pressure of the tongue muscle equivalent to the outer pressure of the perioral soft tissues, such as the orbicular muscles, including the cephalopharyngeus and buccinator muscles. Training is performed so that patients learn to place their tongue and lips in the appropriate resting positions...
2016: Chinese Journal of Dental Research
Tahereh Nosratzehi, Azadeh Akar
OBJECTIVE: To evaluate the potential of omega-3 polyunsaturated fatty acid supplement as an effective, safe and inexpensive medicine for the treatment of recurrent aphthous stomatitis. METHODS: In this double-blind clinical trial, 50 patients with recurrent aphthous stomatitis were randomly divided into the omega-3 group and placebo group. Patients in the omega-3 group received 1000 mg omega-3 group capsules (Daroupakhsh Company, Tehran, Iran) for 6 months; while those in the placebo group received placebo capsules with the same instructions...
2016: Chinese Journal of Dental Research
Si Si Wang, Hui Zhang, Yan Si, Tao Xu
OBJECTIVE: To analyse a possible predictive index for dental caries in 3 to 6 year old children in urban Beijing. METHODS: Using random cluster sampling, 2,333 participants from six kindergartens, comprised of 35.7% 3-year-olds, 32.4% 4-year-olds and 31.9% 5-year-olds in urban Beijing were selected. At baseline, questionnaires were administered to about half of the parents. Children's oral health condition was examined at baseline and 6, 12 and 18 months later. In total there were 1,094 children who completed the 18-month evaluation...
2016: Chinese Journal of Dental Research
Jie Zhu, Xiang Ying Ouyang
OBJECTIVE: To evaluate the reproducibility of four parameters for quantitatively assessing maxillary molar furcation involvement (FI) by cone beam computed tomography (CBCT). METHODS: Thirty-nine sites with degree II FI, classified by probing of 21 maxillary molars, were investigated. Degrees of FI in these sites were assessed based on CBCT data. In these samples, four parameters for quantitatively assessing FI in CBCT images were measured. The parameters included horizontal bone loss at furcation entrance level (HBL), maximum HBL (HBL-max), maximum vertical bone loss (VBL-max) and root trunk length (RT)...
2016: Chinese Journal of Dental Research
Li Ting Jiang, Yin Yin Xie, Li Wei, Qi Zhou, Xing Shen, Yi Ming Gao, Xin Quan Jiang
OBJECTIVE: To investigate differentially expressed proteins in rat mandibular condylar cartilage (MCC) chondrocytes caused by initial mastication for short postnatal periods. METHODS: Four groups of protein samples were extracted from primary cultured rat MCC chondrocytes, harvested from eigthy postnatal SD rats aged 1,7,14 and 28 days, with twenty in each group. Total proteins were labelled with isobaric tags for relative and absolute quantification (iTRAQ) reagents...
2016: Chinese Journal of Dental Research
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