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28 January 2021, Volume 37 Issue 1 Previous Issue    Next Issue

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Evidence-based Dental Practice: How to Use the Literature to Inform Clinical Decision-making HUA Fang 2021, 37(1): 1-5.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.001 Abstract ( 388 )   PDF (863KB) ( 393 )   Evidence-based dental practice (EBDP) is the core idea and main objective of evidence-based dentistry (EBD). However, much of the development of EBD has been in the field of evidence-based dental research, with inadequate attention paid to the translation of high-quality clinical research evidence into clinical practice. Currently, EBDP-related knowledge and skills are not widely disseminated in China, relevant education and training still need to be strengthened. In order to help dental care workers use the literature to inform their clinical decision-making, this article will provide a brief introduction to EBDP-related concepts and common pitfalls, with a main focus on the critical appraisal of dental literature. References | Related Articles | Metrics

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Clinical Practice of Preformed Crown on Children's First Permanent Molars TIAN Yuting, CHENG Li 2021, 37(1): 6-10.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.002 Abstract ( 335 )   PDF (4389KB) ( 578 )   On account of its special function and position, the first permanent molars play a very important role in oral health and even in general health. The diseases occurring in the first permanent molar, if not treated in time, may lead to serious tooth defects or even tooth extraction. At present, the management standard of severely damaged first permanent molars has not been described clearly in the literature, and the relevant researches on restorative techniques are limited. The purpose of this paper is to provide some references and ideas for relevant clinical decisions and future research directions, by means of expounding the importance of first permanent molars, analyzing the necessity and treatment status of restoration for tooth defect, and introducing the effect and clinical application of preformed metal crowns in children's first permanent molars. References | Related Articles | Metrics

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Research Progress in Inducing Dentin Remineralization to Seal Dentin Tubules TIAN Zilu, ZHU Song 2021, 37(1): 11-14.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.003 Abstract ( 331 )   PDF (779KB) ( 541 )   Dentin tubules are tubular structures which go through the entire layer of dentin. The exposing of dentin tubules will lead to adverse consequences, such as dentin allergy, bacterial colonization, and influencing of restoration bond. Dentine remineralization can seal exposed dentin tubules and relieve clinical symptoms. Based on the current development of dentin remineralization, this paper reviews the remineralization effect of poly(amidoamine), 8DSS,copine 7 protein,tannin, and gallic acid, and overlooks the future development of dentin remineralization. References | Related Articles | Metrics

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Research Progress of Necroptosis on Cartilage Degeneration in TMJOA HE Feng, YU Shibin 2021, 37(1): 15-18.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.004 Abstract ( 279 )   PDF (1125KB) ( 260 )   Temporomandibular osteoarthritis (TMJOA) is a severe form of temporomandibular disorder (TMD). Articular cartilage degeneration is one of the most typical pathological features in primary TMJOA, and chondrocyte death is the core event in cartilage degeneration. Compared with apoptosis and autophagy, the release of damage associated molecular patterns (DAMPs) after the occurrence of necroptosis, which is a new type of cell death, do further harm to chondrocytes and cartilage extracellular matrix. The TNF-α-Necroptosis-DAMPs-TNF-α vicious circle may result in extensive destruction to cartilage. Therefore, this article briefly reviews related researches on necroptosis in cartilage degeneration of OA in order to provide new understanding concerning the pathogenesis of TMJOA. References | Related Articles | Metrics

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Comparison of Biodentine and MTA as Pulpotomy Agents for Primary Teeth MAI Lijia, YUAN Guohua 2021, 37(1): 19-22.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.005 Abstract ( 528 )   PDF (778KB) ( 799 )   Pulpotomy is one of the most common therapies of primary teeth. The pulpotomy technique involves a series of sterile procedures including removal of the infected pulp and covering the remaining pulp with a pulp-capping agent. Mineral trioxide aggregate (MTA) is now commonly used as pulp-capping agent for pulpotomies in primary teeth, but it still has many disadvantages. Biodentine (BD), a new-developed calcium silicate cement with superior mechanical property, biocompatibility, and excellent clinical effect, is a promising alternative to MTA. In this review, we list and compare the characteristics and clinical efficacy of MTA with BD as pulpotomy agents for primary teeth. References | Related Articles | Metrics

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Effect of Gli1 Inhibitor GANT61 on Tooth Development in Vitro ZHANG Shixian, LIN Chengquan, XIE Changfu, CHEN Weihui 2021, 37(1): 23-27.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.006 Abstract ( 220 )   PDF (4397KB) ( 199 )   Objective: To study the effect of Gli1 inhibitor GANT61 on tooth development in mice. Methods: The mouse molar germ in culture system was observed with stereoscope and histology after being affected by the Gli1 inhibitor GANT61, and the size of the tooth germ was measured. Results: Histological analysis showed that the degree of GANT61 treated group’s development was slower compared with that in the control group. Furthermore, the enamel organ was irregular in shape, and the inner enamel epithelial cells were irregularly arranged. The size of the enamel organ was significantly smaller in the high dose of GANT61 compared with that in the control group. Conclusion: GANT61 can block the development of molar by disturbing the development of enamel organ. References | Related Articles | Metrics

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Regulation of Odontoblastic Differentiation by miR-1895 in Mouse Dental Papilla Cells ZHANG Hao, YANG Guobin 2021, 37(1): 28-32.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.007 Abstract ( 227 )   PDF (1304KB) ( 211 )   Objective: To investigate the function of miR-1895 during the odontoblastic differentiation of mouse dental papilla cells. Methods: The model of odontoblastic differentiation of mouse dental papilla cells was established, and the expression of miR-1895 was detected during this process. The binding site of miR-1895 in Klf4 mRNA was analyzed by using bioinformatics. Western blot and real-time PCR were employed to detect the influence of miR-1895 on odontoblastic differentiation of mouse dental papilla cells after transfection with miRNA inhibitor. Results: The expression of miR-1895 decreased during the odontoblastic differentiation of mouse dental papilla cells. There was a binding site to miR-1895 in Klf4 mRNA. After inhibiting miR-1895, the expression of related genes of odontoblastic differentiation increased. Conclusion: miR-1895 inhibited the odontoblastic differentiation of mouse dental papilla cells and might participate in regulating this process. References | Related Articles | Metrics

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Effects of Phillyrin on p38 MAPK/c-Fos Signal Pathway and Osteoclast Activation in Periodontitis Rats SU Juanjuan, ZHU Yongcui, ZHANG Wenling 2021, 37(1): 33-38.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.008 Abstract ( 265 )   PDF (3770KB) ( 338 )   Objective: To investigate the effects of phillyrin on p38 MAPK/c-Fos signal pathway and osteoclast activation in periodontitis rats. Methods: The periodontitis rat model were established and randomly divided into groups: model group, low dose phillyrin group, middle dose phillyrin group, high dose phillyrin group, and vitamin C group, with 12 in each group, and another 12 rats were set as control group. After treatment, methylene blue staining was used to detect alveolar bone resorption (distance from the border of enamel cementum to the crest of alveolar ridge). HE staining was used to detect the periodontal pathological morphology. The number of osteoclasts in periodontal tissue was detected by TRAP staining. The levels of serum tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) were detected by enzyme-linked immunosorbent assay (ELISA). The expression of p38 MAPK/c-Fos pathway related proteins was detected by Western blot. Results: Compared with the control group, the periodontal tissue of the model group showed epithelial defect, rupture, abnormal morphology, disordered arrangement of periodontal membrane fibers, inflammatory cell infiltration, and other pathological damage, and the distance from the border of enamel cementum to the crest of alveolar ridge, the number of osteoclasts, the levels of TNF-α and IL-6, and the expressions of p38 MAPK/c-Fos pathway related proteins c-Fos and p-p38 MAPK/p38 MAPK in periodontal tissues were significantly higher (P<0.05). Compared with the model group, the pathological damage of periodontal tissue in the low, middle, and high dose phillyrin groups and vitamin C group was alleviated, the distance from the border of enamel cementum to the crest of alveolar ridge, the number of osteoclasts, the levels of TNF-α and IL-6, the expression of c-Fos protein and p-p38 MAPK/p38 MAPK in periodontal tissues were significantly lower (P<0.05), and phillyrin groups were dose-dependent (P<0.05), while there was no significant difference between high dose phillyrin group and vitamin C group (P>0.05). Conclusion: Phillyrin can down-regulate p38 MAPK/c-Fos signal pathway, inhibit periodontitis and osteoclast activation, reduce periodontal tissue damage, and improve periodontitis symptoms in rats. References | Related Articles | Metrics

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Experimental Study and Clinical Observation of Hyaluronic Acid Gel Combined with Nd:YAG Laser on Sensitivity of Tooth Root of Elderly Patients with Periodontitis ZHOU Yue, SHEN Yuqin 2021, 37(1): 39-42.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.009 Abstract ( 274 )   PDF (1465KB) ( 359 )   Objective: To observe and evaluate the clinical effect of hyaluronic acid gel combined with Nd:YAG laser in the treatment of tooth root sensitivity complications after periodontal initial therapy in elderly patients. Methods: 24 complete caries-free premolars of elderly patients due to chronic periodontitis were selected, and randomly divided into 4 groups. The tooth roots were treated by using normal saline, hyaluronic acid gel, Nd: YAG laser, and hyaluronic acid gel combined with Nd: YAG laser, respectively. The morphology of all 24 specimens was observed under scanning electron microscope. 60 elderly patients with tooth root sensitivity complications after periodontal initial therapy were randomly divided into 3 groups, which were hyaluronic acid gel group (20 cases, 66 teeth), Nd: YAG laser group (20 cases, 81 teeth), and the combined group (20 cases, 102 teeth). The hyaluronic acid gel group was treated with hyaluronic acid gel alone, the Nd: YAG laser group was treated with Nd:YAG laser irradiation, and the combined group was treated with hyaluronic acid gel combined with the laster irradiation. The effects were evaluated by Schiff cold air sensitivity index. Results: Scanning electron microscopy showed that hyaluronic acid gel, Nd:YAG laser irradiation, and hyaluronic acid gel combined with Nd:YAG laser irradiation can seal the dentin tubules, but hyaluronic acid gel combined with Nd:YAG laser had the best effect. The clinical observation results showed that the effective rates of hyaluronic acid gel group, the Nd:YAG laser group, and the combined group were 69.70%, 83.95%, and 93.13% (P<0.05). Conclusion: Hyaluronic acid gel combined with Nd:YAG laser irradiation has better clinical effects in the treatment of tooth root sensitivity complications after periodontal initial therapy in elderly patients. References | Related Articles | Metrics

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Study on Relationship between Negative Emotion and Chronic Periodontitis LU Hao, LI Jinfeng, SU Xu, DAI Jianghong, CHEN Xiaotao 2021, 37(1): 43-47.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.010 Abstract ( 211 )   PDF (774KB) ( 211 )   Objective: To explore the relationship between negative emotion and chronic periodontitis. Methods: A total of 944 people, who were from Huocheng County, Yining City, Xinjiang Province, were selected and participated in the research object "Xinjiang multi-ethnic cohort study". According to the recorded periodontal pocket depth (PD) and attachment loss (AL), the subjects were divided into periodontal healthy group, mild Cp group, moderate Cp group, and severe Cp group. A questionnaire survey was conducted to compare the differences in a total of 11 variables in length of sleep (including siesta), sleep problems (at least three days a week), the frequency of snoring during sleep, whether depressed, whether in anxiety, self-cognition of physical status, and etc. Results: One-way analysis showed that 7 variables had influence on the prevalence of Cp (P<0.05). The multivariate ordered logistic regression analysis showed that there were four independent risk factors: an increasing number of dental caries, snoring, poor health, and depression. Conclusion: Negative emotions were significantly correlated with Cp. We are required to pay attention to the relationship between physical and mental health and oral health. References | Related Articles | Metrics

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Changes of Labial-palatal Alveolar Bone in Maxillary Incisor Region in Adult Patients with Bimaxillary Protrusion Before and After Orthodontic Treatment YANG Andi, MAO Huimin, LEI Lang 2021, 37(1): 48-52.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.011 Abstract ( 246 )   PDF (1002KB) ( 263 )   Objective: To analyze the changes of labial-palatal alveolar bone in the maxillary incisor region in patients with bimaxillary protrusion, and to provide potential reference for a safe orthodontic tooth movement. Methods: Twenty-three adult patients who were diagnosed with bimaxillary protrusion were enrolled in the study. All patients were treated with straight wire appliances after extraction of four first premolars. Sliding mechanics with en masse retraction were utilized in the all subjects. CBCT images were taken before and after treatment. Following variables were measured to analyze the alveolar bone remodeling in the maxillary incisor region: (1) alveolar bone thickness (ABT); (2) labial and palatal cementoenamel junction-alveolar bone crest height (ABH); (3) labial and palatal alveolar bone area (ABA). Results: The labial ABT at mid-root and apical levels increased significantly in both central and lateral incisors (P<0.05), while the palatal ABT at all three levels consistently decreased after treatment (P<0.05). Regarding the changes of total ABT, significant reduction was observed in central incisors at the crestal and mid-root levels, and in lateral incisors at all three levels (P<0.05). ABA consistently reduced on the palatal side and increased on the labial side after treatment (P<0.05). Significant increase in the palatal ABH was observed at both central and lateral incisors after treatment, while an increase in the labial ABH was found at lateral incisors (P<0.01). Conclusion: Retraction of maxillary incisors in bimaxillary protrusion patients reduced periodontal bone support on the palatal side, leading to less alveolar bone in the maxillary incisor region. Potential risks of reduced alveolar bone on the periodontal sequalae should be further evaluated in the long term. References | Related Articles | Metrics

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Correlation Analysis between Thickness of Anterior Upper Teeth and Skeletal Relations in 60 Mongolian Teenagers ZHANG Liyuan, JIN Wulong, BAO Xuemei 2021, 37(1): 53-57.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.012 Abstract ( 195 )   PDF (1786KB) ( 136 )   Objective: To obtain the 3D dental model data by high precision laser scanning technique, and observe the variation of crown thickness, and its relationship to skeletal structure. Methods: 60 Mongolian teenagers orthodontic patients were selected from Affiliated Hospital of Inner Mongolia Medical University between December 2015 to July 2019. The thickness of anterior teeth was measured,and the difference analysis of the measurements of the examinations was conducted, and the correlation of the thickness of upper anteriors with skeletal craniofacial pattern was evaluated. Results: The thickness of upper anterior teeth displayed the biggest difference 3mm to the occlusal surface,and the smallest variation 1mm to the occlusal surface. The thickness of maxillary lateral incisor displayed the biggest difference.The thickness of maxillary canine at 3mm to the occlusal surface was significant different to those of central incisor and lateral incisor(P=0.00). And the thickness at 2mm to the occlusal surface of maxillary lateral incisor was significant different to those of central incisor and canine(P=0.00). The thicknesses of male at U1T3, U2T3, U3T2, and U3T3 were statistically bigger than those of female. There was a moderate positive correlation between upper anterior teeth thickness of U3T3 and ∠SNA, between U2T3 and ∠SNB, between U1T3, U2T3, U3T2, U3T3 and ∠ANB, and negative correlation between U2T2, U2T3 and ∠MR-Copd. Conclusion: The thickness of maxillary anterior teeth varies greatly. When facing orthodontic treatment for Mongolian teenagers with different relationship between the jaws, the influence of anterior crown thickness on anterior torque, overjet, overbite, and establishment of occlusal relationship should be taken into account, therefore, the correctional quantity should be different. References | Related Articles | Metrics

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A Retrospective Study on Efficacy of Short Implants (≤6 mm) in Atrophic Posterior Tooth Area for 5-7 Years HU Changqi, WEI Zhenyu, WEI Hongwu, XIA Xun, HUANG Jiangqin, GONG Jinmei, GUO Shuigen 2021, 37(1): 58-62.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.013 Abstract ( 250 )   PDF (1079KB) ( 263 )   Objective: To evaluate the long-term clinical efficacy of short implants (≤6 mm) in the posterior teeth. Methods: From January 2009 to January 2012, 17 patients in the Department of Stomatology, the Fourth Affiliated Hospital of Nanchang University were implanted with 33 Bicon implants (implant length≤6 mm). The observation period was 60-84 months. The marginal bone resorption, implant retention rate, and complications were recorded. Results: During the observation period, one of 33 implants fell off, the implant retention rate was 97.0%, and the bone resorption levels of the implants in the near and far of the implant were (-0.74±0.05) mm and (0.05±0.07) mm within 60 to 84 months after the restoration was completed. There was no significant difference in the bone height at the proximal and distal edges of the implant before and immediately after restoration (P>0.05). Conclusion: In the observation period of 5-7 years, the short implants (≤6 mm) are applied to the posterior teeth area with insufficient bone mass, and their survival rates and bone resorption levels are not different from those of conventional implants, and good long-term effects can be obtained. References | Related Articles | Metrics

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A Retrospective Study on Occurrence of Mechanical Complications in Multi-unit Posterior Implants Combining Screw Fixation with Adhesive Fixation ZHOU Liwei 2021, 37(1): 63-66.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.014 Abstract ( 245 )   PDF (1339KB) ( 378 )   Objective: To compare the difference of mechanical complications between the internal and external adhesion in multi-unit screw-retained implant prosthodontics. Methods: There were 205 patients (414 implants) with multi-unit screw retention implant-supported prostheses in posterior area for 3 years. Among them, 99 patients (198 implants) had inner metal crown and outer zirconia crown bonded by technician and screw fixed in mouth, and 106 patients (216 implants) were fixed the inner metal crown with screw which had completely passive fit and then bonded the outer crown by doctor in mouth. The incidence of mechanical complications was compared between two groups after 3-year observation. Results: 48 of 198 screws in the cases bonded by technician had mechanical complications at different levels, and the adhesive failed in 3 cases. 24 of 216 screws in the cases bonded by doctor had screw loose, and the adhesive failed in 15 cases. There was significant difference in the outcome of mechanical complications and adhesive failure between two retention methods (P<0.05). Conclusion: In the 3-year observation period when bonded in-mouth by doctor, the screw loosening probability was reduced, however, the possibility of adhesive failure increased. References | Related Articles | Metrics

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Effects of Nalbuphine and Sufentanil on Postoperative Analgesia and Inflammatory Factors in Patients with Maxillofacial Fracture LI Meisheng, GAO Hong 2021, 37(1): 67-70.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.015 Abstract ( 205 )   PDF (749KB) ( 309 )   Objective: To observe the postoperative analgesic effect of nbuphine combined with sufentanil on patients with maxillofacial fractures and the changes of inflammatory factors. Methods: Eighty patients with postoperative intravenous controlled analgesia in our hospital from August 2019 to November 2019 with maxillofacial fractures were randomly divided into control group and study group (40 patients in each group). At different time points after surgery, visual analog pain score, Ramsay sedation score, after 48h self-control analgesia in patients with total number of press number and press, satisfaction, c-reactive protein and calcitonin original in the peripheral blood, and the quality of life score were analyzed. Results: VAS scores and RSS scores of the two groups were insignificant after 2h of administration, while the study group was significantly better than the control group after 4 h, 8 h, 12 h, 24 h, and 48 h of administration. The total number of postoperative compressions and effective compressions in the study group were lower than those in the control group. The satisfaction of the study group was better than that of the control group. There was no statistically significant difference between the two groups in c-reactive protein and procalcitonin before operation (P>0.05). The quality of life score of the study group was better than that of the control group. Conclusion: Nabuphine combined with sufentanil can significantly enhance the postoperative analgesic effect, reduce the level of inflammatory factors in the body, and improve patient satisfaction and living standard, which is worthy of clinical application. References | Related Articles | Metrics

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Application of Topical Anesthesia Combined with STA in Extraction of Supernumerary Teeth in Children ZHANG Yuejiao, GAO Xiaozhe, LI Zhengwang, GUO Yazheng, GAO Yawei, ZHANG Xudong 2021, 37(1): 71-75.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.016 Abstract ( 222 )   PDF (1325KB) ( 335 )   Objective: To compare the effects of topical anesthesia combined with STA painless anesthesia, STA painless anesthesia, and traditional pressure syringe local anesthesia in the extraction of supernumerary teeth in children. Methods: Ninety children aged 5-14 years with supernumerary teeth in maxillary anterior teeth were randomly divided into three groups with 30 children in each group. Group A was topical anesthesia combined with STA painless anesthesia, group B was STA painless anesthesia, and group C was local anesthesia with traditional pressure syringe. All groups were treated with labial and palatal local infiltration anesthesia. The values of systolic blood pressure, diastolic blood pressure, heart rate, and blood oxygen saturation were recorded before and after injection. During the injection, the behavior of the children was scored by the modified behavior scale (MCHEOPS), and the degree of pain during anesthesia was evaluated according to the Wong-Baker facial expression scale at the end of treatment. Results: During palatal infiltration anesthesia, the degree of pain in group A and B was less than that in group C(P<0.05), but there was no significant difference between group A and group B(P>0.05). During buccal infiltration anesthesia, the degree of pain in group A was significantly alleviated (P<0.05). The self-pain evaluation of children showed that the pain value of children in group A was lower (P＜0.05). There was no significant difference in blood pressure, heart rate, and blood oxygen saturation in group A before, during, and after injection, but the blood pressure in group B and group C increased significantly after injection (P＜0.05). Conclusion: The application of topical anesthesia combined with STA painless anesthesia in the treatment of supernumerary tooth extraction in children can reduce the pain during injection. References | Related Articles | Metrics

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Computer-aided Design Combined with 3D Printing Applied to Autologous Tooth Transplantation ZHU Xiaoxue, ZHAO Sufeng, YANG Xudong, SUN Guowen, YANG Yaping, HUANG Lijuan, HE Kai 2021, 37(1): 76-80.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.017 Abstract ( 264 )   PDF (4279KB) ( 366 )   Objective: To evaluate the clinical effect of 3D printing technology in autogenous tooth transplantation. Methods: From May 2016 to May 2019, 31 patients were selected and analyzed from the perspectives of age, gender, receiving area, donor tooth development, transplantation time, model preparation time, alveolar fossa preparation time, donor tooth separation time, average distance between donor root and alveolar fossa, transplantation operation score, and success rate. Results: The preparation time of the experimental group and the control group was (12.28±3.15 vs 19.86±6.52) min, the separation time of the donor teeth in the experimental group and the control group was (3.22±1.21 vs 12.12±4.18) min, and the average distance between the root surface of the experimental group and the control group was (0.76±5.44 vs 1.31±0.16) mm, respectively. At 8 weeks after the operation, 96.67% of the patients in the experimental group achieved grade Ⅰ and grade Ⅱ , while 83.87% in the control group. Six months after the operation, the success rate of the experimental group was 96.67%, and the retention rate was 100%; the success rate of the control group was 90.00%, and the retention rate was 96.78%. Conclusion: Based on CAD and 3D printing technology, autogenous tooth transplantation can shorten the time of donor teeth in vitro, improve the matching degree of donor area and recipient area, and effectively improve the clinical success rate of autogenous tooth transplantation. References | Related Articles | Metrics

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Application of Multi types of Digital Images Matching and 3D Printing Technology in the Treatment of Condylar Tumor MA Wen, WEI Yi, LU Lin, FU Shuai, ZHANG Changbin, CUI Qingying, PENG Canbang, WANG Lidong, XU Yanhua, LI Ming 2021, 37(1): 81-86.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.018 Abstract ( 177 )   PDF (3405KB) ( 951 )   Objective: To investigate the clinical significance of multiple types of digital images matching and 3D printing technology in the treatment of condylar tumors. Methods: According to patient's spiral CT data, CTA data of blood vessels, 3D scanning data of teeth, the maxillary, mandible, soft tissue and condylar tumors with surrounding important anatomic structures were reconstructed using Mimics 21.0(Materialise, Belgium). Then, matching the 3D scanning of teeth with bones data from spiral CT, matching the soft tissue with bones. Finally, in the same coordinate system, the three-dimensional model of the maxillary and mandible complex with tooth information, condylar tumors and surrounding blood vessels were obtained. Designing and 3D printing splint was assisted operation. Results: All 6 patients were underwent the operation successfully with the wounds healed at the same time. The occlusal relationship of all patients were well. The postoperative CBCT showed that complete resection of tumors and no signs of recurrence were found in long term follow-up. Conclusion: Multi types digital image matching and 3D printing splint could accurately reconstruct the important anatomic structures such as condylar tumors and peripheral blood vessels, so as to fully understand the operation area before operation. At the same time, personalized 3D splint was designed to create space for operation and reduce the damage of surrounding tissues. This method could be used as an auxiliary way to treat patients with condylar tumors. References | Related Articles | Metrics

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A Comparative Study on the Restoration Process with Digital or Traditional Technique in Aesthetic Zone WANG Ling, LIN Tingyun, RONG Rong, SA Yue 2021, 37(1): 87-88.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.019 Abstract ( 295 )   PDF (5032KB) ( 468 )   This study compared the clinical effect of porcelain veneers made by digital or traditional technique for maxillary microdontia with scattered gap for one-year follow-up. References | Related Articles | Metrics

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Extraosseous Calcifying Epithelial Odontogenic Tumor: One Case Report LIU Rongrong, MENG Xiangjiao 2021, 37(1): 89-90.  DOI: 10.13701/j.cnki.kqyxyj.2021.01.020 Abstract ( 312 )   PDF (2579KB) ( 216 )   Calcifying epithelial odontogenic tumor (CEOT) is a benign, slow growing, but locally invasive neoplasm, also known as Pindborg tumor. The incidence of CEOT accounts for 0.4%-3% of all odontogenic tumors. It is known to have a common intraosseous variant (94%) and a very rare extraosseous variant (6%) according to the literature report. In this paper, we report an extraosseous variant of CEOT in our department. References | Related Articles | Metrics