Dynamic surgical navigation system has been wildly used in implantology, the navigation surgical system provide preoperative trajectory planning. Moreover, the constant visualization of drilling trajectory during operation assist the operators by avoiding critical anatomic structures to achieve safer surgery. Our article focuses on the development and function of dynamic navigation system to evaluate the accuracy of dynamic surgical navigation system when used for regular implants and zygomatic implants placement. We aim to discuss the accuracy of different brand of dynamic surgical navigation systems for implants placement and to investigate the main reasons led the inaccurate outcome.
In recent years, the number of edentulous patients has been increasing with the increase of aging popula-tion and the number of patients with complete denture. Denture adhesive is an indispensable material of denture reten-tion intensifier in the clinic, which has been used for long periods in patients with full denture or partial denture. In this paper, we made a brief introduction according to the denture adhensive classification, mechanism of action, clinical at-tention and the latest research progress.
Objective To compare the wear of Ceramage and IPS e.max Press offering foundation for nonmetallic materials selection in clinical. Methods 20 class I cavities were prepared in the approximal flattened sides of the extracted human maxillary first molars. The cavities were divided into 2 groups randomly, and then restored with Ceramage or IPS e.max Press. Inlays were prepared according to the manufactures’ instructions with indirect methods and cemented with Varolink N. The non-wear extracted maxillary third molars were used as antagonistic enamel cusps after standardized prepared. After the self-made wear-testing device concluded 200,000 cycles under a load of 20 N, the wear depth of specimens and antagonistic enamel cusps was assessed by Kavo PREP assistant. Results The wear in Ceramage group was (298.30 ± 40.02) μm, while the wear of normal enamel was (206.60 ± 49.17) μm. The wear in IPS e.max Press group was (212.90 ± 61.21) μm, while the wear of normal enamel was (217.00 ± 25.10) μm. The wear of IPS e.max Press inlays was higher than Ceramage inlays (P < 0.05). Ceramage inlays showed higher wear than normal enamel (P < 0.05), while IPS e.max Press inlays was not statistically different from the normal enamel (P > 0.05). Conclusions Ceramage has more wear than IPS e.max Press. Ceramage shows higher wear compared with normal enamel, while IPS e.max Press has lower antagonistic war compared with normal enamel.
Objective This in vitro study aimed to investigate the remineralization effect of the natural medicine epigallocatechin gallate on artificial enamel caries in primary human teeth. Methods We divided 30 sound primary upper anterior teeth into 3 groups according to a random number table, including experimental group (epigallocatechin gallate group), positive control group (NaF group) and blank control group (artificial saliva group), with 10 teeth in each group. After test in vitro, Micro Hardness Tester was applied to measure hardness of samples before and after demineralization. Scanning electron microscopy (SEM) was used to observe the result of primary enamel surface remineralization. Results A significant increase in enamel surface microhardness between the three groups after remineralization (F=1 199.975, P < 0.05). The difference between 2 groups was compared with each other among 3 groups. Statistical significance was found (vs experimental group q=41.986, P < 0.05; vs positive control group q=68.174, P < 0.05), suggesting that both positive control group and experimental group could promote the remineralization of primary enamel, and the effect of epigallocatechin gallate was weaker than NaF (q=26.188, P < 0.05 ). The results from SEM indicated that there was large amount of sediment on the surface of primary enamel surface of incisors in the experimental group and positive control group, while primary enamel surface of incisors in the blank control group was honeycomb and uneven, with less sediment. Based on this in vitro study, epigallocatechin gallate can promote the remineralization of demineralized enamel of primary teeth, indicating its potential use as a natural remineralization medicine.
Objective To evaluate the expression of HAase in Oral Squamous Cell Caricinoma (OSCC). Methods The distribution and expression of HAase in 21 patients with OSCC and their resecetions with tumor-free margins were examined by immunohistochemistry method.Results HAase were mainly immunostained in tumor tissue. The expression of HAase in oral cancer with nodal metastasis and low pathological grades were higher than that with no nodal metastasis and high pathological grades (P < 0.05), whereas no difference between the TNM stages (P > 0. 05). Conclusion The HAase levels were high in oral squamous cell carcinoma tissues, and rising in patients with lymph node metastasis and poorly differentiated.
Objective To analyze implant survival rate and incidence rate of complications after All-on-4 implantation, and to discuss the technical points and consideration of All-on-4. Methods According to the criteria of inclusion and exclusion, 23 cases treated with All-on-4 immediate restoration were referred, from January 2007 to December 2015, including 5 cases of edentulous maxillary, 14 cases of edentulous mandibular and 4 cases of both maxillary and mandibular were edentulous. All the patients received immediate function with provisional prostheses at the surgery day. Definitive prostheses were delivered to patients after 3-6 months post operation and follow-up visits were performed up to 9 years (average 3 years) after placement of definitive prostheses. Results In this study, the rate of implant retention of 108 implants and 27 final restorations was 100% until the last review. Among the 23 patients, 3 patients had complications and the incidence of complications was 13.0%. Conclusion All-on-4 is an effective and reliable method in the treatment of dentures denture. The incidence of complications is low. All-on-4 is a practical method.
Objective To investigate the clinical efficacy of prosthesis retained by metal clasp and flexible clasp in the repair of type Ⅴ maxillary defects after tumor resection. Methods 23 maxillary tumor surgical patients were selected in this study and restored with maxillofacial prosthesis. Total 24 prosthesis combined with metal clasp and flexible dentures were followed up for half a year to 2 years. Results After the application of prosthesis, better maxillofacial appearances are presented in all of the patients, Watian drinking water tests are improved to grade Ⅰ or Ⅱ from grade Ⅳ or Ⅴ in 21 patients, there was significant difference (P < 0.05); Soft diet can be masticated on affected side in 15 patients; The mean speech intelligibility score with and without prosthesis were (83.2 ± 7.3)% and (36.6 ± 5.6)%, there was significant difference (P < 0.05); Favorable hygienic situations of oral cavity and prosthesis are maintained in 18 patients. Conclusion Prosthesis combined with metal clasp and flexible denture performed favorable clinical efficacy and contributed to improve the living quality and mental health after tumor resection.
Objective To investigate the short-term efficacy of implant in the treatment of patients with dentition defect caused by chronic periodontitis. Methods 53 patients with mild to moderate chronic periodontitis treated in our hospital from June 2014 to May 2015 were selected as observation group, and 53 patients without periodontal diseases in the same period were selected as control group. The plaque index (PLI), sulcus bleeding index (SBI), periodontal probing depth (PD) and gingival papilla index (PIS) were measured at six months and one year after operation, respectively. Interleukin-6 (IL-6), interleukin-8 (IL-8), high sensitive C-reactive protein (hs-CRP) and tumor necrosis factor-α (TNF-α) were detected at six months and one year after operation, respectively. At the last follow-up, the survival rate of two groups were calculated. Results One year after operation, 5 of the 64 implants in the observation group failed compared with 2 of the 71 implants in the control group. There was no statistical difference in the implant survival rate between the two groups (92.19% vs 97.18%, P=0.191). There was no significant difference in SBI (t=0.936, P=0.351)、 PLI (t=0.457, P=0.649)、PIS (t=1.132, P=0.217)、PD (t=0.957, P=0.341) between the two groups at six months after operation. One year after operation, the periodontal index of the observation group was higher than that of the control group SBI (t=5.297, P=0.000)、 PLI (t=2.341, P=0.021)、 PIS (t=8.218, P=0.000) and PD (t=6.492, P=0.000). The levels of IL-6 (t=6.463, P=0.000)、 IL-8 (t=7.202, P=0.000)、 hs-CRP (t=4.237, P=0.000) and TNF-α (t=6.194, P=0.000) in the observation group were higher than those in the control group at six months after operation. One year after operation, the level of inflammatory factors in the observation group was higher than that in the control group IL-6 (t=12.835, P=0.000)、 IL-8 (t=13.207, P=0.000)、 hs-CRP (t=11.319, P=0.000) and TNF-α (t=8.117, P=0.000). Conclusion Implant as the treatment of patients with dentition defect caused by chronic periodontitis obtained satisfied short-term effect, but its long-term efficacy remains to be further verified.
The mandibular first premolar has complicated morphology of root canal, it has more variation which increases the incidence of multiple root canals. A successful root canal therapy not only need strict cleaning, disinfection and filling, but also need a correct understanding of root canal morphology and anatomy. Otherwise there might be a risk of missing canals that resulting the failure of the therapy. Also crown closure is one of the successful elements of root canal therapy. This is a case report accompanied by a review of the literature that shows the unusual anatomy of the mandibular first molar with three roots and three root canals.
The mandibular canine usually has a single root with a single canal. It is rarely to see a mandibular canine with two roots and two toot canals. A case of a patient who has a right mandibular canine with two roots and two root canals was reported. Cone beam computed tomography (CBCT) comprehensively demonstrated the root canal system and especially provided the information of canal varieties and complex canal before operation. CBCT can improve the discovery rate of canal varieties, guide root canal treatment and prevent missed roots in tooth extraction.
Objective To investigate the status of tooth caries of 6-8 years old school children in Zhongkai Hi-Tech Zone of Huizhou city, and to provide scientific data for prevention and treatment on caries. Methods Referring to the Guideline for the 3rd National Oral Health Survey, the dental caries status of 1-2 grade students in 32 primary schools were investigated, and the data were analyzed by SPSS 14.0 statistical software. Results The prevalence rate of deciduous teeth caries in 4 390 children was 67.4%, and the DMFT was 3.94; The eruption rate of the first molars was 81.5%, with the prevalence rate of caries was 24.3%, and the DMFT was 0.448. The rate of caries for 8 years old children is higher than in 6-7 years old children (P < 0.001). Conclusion There is a high caries rate in children in Zhongkai Hi-Tech Zone of Huizhou, so oral health education, primary teeth caries treatment, and fissure sealant of permanent teeth should be strengthened.
Dental caries is a common oral infectious disease in humans. It is seriously harmful to human’s health. Dental caries is closely related to the cariogenic bacteria. Now, there are many studies on the pathogenic mechanism of the cariogenic bacteria. There are many different methods to prevent dental caries. In this paper, we mainly reviewed the inhibitory effect and mechanism of anti-caries materials on cariogenic bacteria.
With the development of implant technology and materials, the aesthetic of implant prosthesis has been paid more and more attention. Implant prosthesis should be coordinated with patients’ characteristics, the existing aesthetic indices have no unified standard. Based on current research and clinical experiences, this review narrated the esthetic indices of implant crowns and peri-implant soft tissue and influencing factors of dental implant in the aesthetic area.
Gardner syndrome is a rare disease in oral and maxillofacial diseases which is characterized by intestinal polyposis, multiple osteomas, skin and soft tissue tumors. Early treatment has a better prognosis; therefore the early diagnosis of Gardner syndrome is very important. Maxillofacial pathology always appears to precede the other pathologies, so the importance of early detection of the syndrome by dentists is also emphasized. This review summarizes the etiology of Gardner syndrome-related mutations and the clinical manifestations of Gardner syndrome characterized by oral and maxillofacial deformities, multiple gastrointestinal polyps, and desmoid tumour, and their associated treatment.
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