Journal of Oral Science Research

Research Progress and Application Prospect of Dental Pulp Stem Cells in Repairing Facial Nerve Injury

NIU Yumei, SUN Xiangyu

2021, 37(3): 185-190. DOI: 10.13701/j.cnki.kqyxyj.2021.03.001

Abstract ( 243 )

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Facial nerve injury seriously affects the physical and mental health of patients. In recent years, the use of stem cells to treat nerve injury has been widely concerned. Dental pulp stem cells show great advantages in the repair and treatment of nerve injury, which provides a new idea for the treatment of facial nerve injury. The present article reviews the research progress and application prospect of dental pulp stem cells in the repairing of facial nerve injury.

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Research Progress of Bioceramics as Root-end Filling Materials

TIAN Qinglu, WANG Yan

2021, 37(3): 191-194. DOI: 10.13701/j.cnki.kqyxyj.2021.03.002

Abstract ( 336 )

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One of the essentials during root canal therapy is creating a closed sterile environment. However, there are many cases in which the patients have teeth with an open apical area and mostly occur in young permanent teeth. These kinds of teeth are usually more difficult to treat, and meanwhile, the microleakage is easier to appear which may lead to lower success rate. Root-end filling treatment, widely used in clinic, can both shorten the course of treatment and improve clinical efficacy by forming an apical stop artificially. By analyzing the relevant research in recent years, the application of bioceramics in root-end filling treatment are reviewed in this paper, expecting to provide some references for the choosing of materials for root-end filling treatment.

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Introduction and Assessment of Dental Pulp Vitality Test

YANG Jinghui, YUAN Guohua

2021, 37(3): 195-199. DOI: 10.13701/j.cnki.kqyxyj.2021.03.003

Abstract ( 558 )

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Pulp vitality is the basis of the diagnosis and treatment of dental pulp disease. Cold pulp test, hot pulp test, and electric pulp test are widely applied to clinical diagnosis, and they are collectively known as pulp sensitivity test. But at present, stomatologists find that there are many deficiencies in sensitivity test, and in some cases such as young permanent teeth show high misdiagnosis rate. In order to improve the diagnostic accuracy, the dental pulp blood flow test is proposed, greatly reducing the rate of misdiagnosis. However, it is not widely used in clinic. In addition, magnetic resonance imaging and quantitative test of biomarkers are also considered to judge the pulp vitality in theoretical aspect. This paper briefly introduces several methods to judge the pulp vitality and the advantages and disadvantages of them.

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Influencing Factors of Root Canal Occlusion and Its Detection Methods

LI Na, LI Xiangwei

2021, 37(3): 200-203. DOI: 10.13701/j.cnki.kqyxyj.2021.03.004

Abstract ( 227 )

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Root canal therapy is the main treatment method for common oral diseases such as pulp disease and periapical disease. A hermetic coronal sealing of canal system during the root canal treatment can avoid the injection of the periapical tissue and ensure the success of root canal treatment in the long term. Endodontic failure may be caused due to incomplete obturation, including penetration of the microbial and their metabolites through the gap between filling materials and the root canal system. Therefore, tightly sealed root canal system is essential for long-term success. There are many factors that affect the root canal filling sealability and its detection methods have not been systemically described. This is a review about the reason of microleakage and the relationship between complete obturation and the long-term success of root canal treatment and the influenced factors of apical sealing and coronal restorations.

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Research Progress of Small Molecule Compounds Against Dental Plaque Biofilm

ZHANG Jin, XU Xin

2021, 37(3): 204-207. DOI: 10.13701/j.cnki.kqyxyj.2021.03.005

Abstract ( 242 )

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Dental plaque biofilm is the main cause of dental caries and periodontal diseases. The resistance of bacteria in biofilm to antibiotics and host defense is higher than that of planktonic bacteria. There are many shortcomings in the traditional methods to remove biofilm, so the research focus turns to small molecule compounds because they are cell permeable and easily synthesized. The small molecule antibiofilm compounds can be roughly divided into three categories: quorum-sensing inhibitors, bacterial adhesion inhibitors, and crucial virulence factor inhibitors. In this paper, the research progress of small molecule compounds against dental plaque biofilm in recent years is reviewed.

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Effects of Regenerated Fluorapatite Crystal Film on Early Adhesion and Biofilm Growth of Streptococcus Mutans

YANG Suming, LIU Shize, CHEN Haifeng, WANG Xiaoyan

2021, 37(3): 208-212. DOI: 10.13701/j.cnki.kqyxyj.2021.03.006

Abstract ( 193 )

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Objective: To investigate the effects of fluorapatite crystal film (FACF) on early adhesion and biofilm growth of Streptococcus mutans (S. mutans). Methods: Under near-physiological conditions (37℃, 1 atm, pH 6.0-7.4), FACF was regenerated on the surface of exposed dentin. The dentin, hydroxyapatite (HA), and FA were prepared as the control groups. SEM was used to observe the surface morphology of the samples. The adhesion of S. mutans on the surface of dentin and FACF was observed with confocal laser scanning microscope (CLSM) and SEM. The S. mutans biofilm was cultured on the surfaces of HA, FA, dentin, and FACF, which was observed by CLSM. The amount of biofilm was calculated. Results: The thickness of FACF was about 5-10 μm. The crystal was standard six-prism shape with a diameter of 0.5-1 μm and arranged closely and orderly. The adhesion amount of S. mutans of FACF was significantly less than that of dentin (P<0.05), and the amount of biofilm per unit area on FACF surfaces was significantly lower than that of HA, FA, and dentin surfaces (P<0.05). FACF could prevent S. mutans from growing into dentin tubules. Conclusion: Under near physiological conditions, a layer of dense and orderly FA crystal film can be regenerated on the dentin surface. The crystal structure of this layer can reduce the adhesion of S. mutans and formation of biofilm, and act as a physical barrier to the growth of S. mutans into dentin tubules.

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Decursin Reduces Periapical Inflammation by Inhibiting OPN Expression

ZHENG Lijuan, LI Haoran, LIU Jianwei, HAN Bing, CHEN Xiaodong

2021, 37(3): 213-217. DOI: 10.13701/j.cnki.kqyxyj.2021.03.007

Abstract ( 201 )

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Objective: To study the effects and mechanism of decursin in periapical periodontitis. Methods: The rat periapical periodontitis model was established and divided into normal control group, model observation group, and apical periodontitis group. The rats in the apical periodontitis group were equally divided into the decursin group (given decursin, 20mg/kg per day) and normal saline group (given the same dose of saline) in the first week, respectively. The rats were sacrificed in the third week. The area of the periapical lesions was analyzed by radiographs and HE staining. The expression of OPN in the alveolar bone was detected using immunohistochemical staining. Mouse mononuclear macrophages RAW264.7 cells were cultured and treated with LPS and decursin. The proliferation and the level of IL-6 were detected by CCK-8 assay and ELISA, respectively. The expression of OPN was examined by western blot. Results: The periapical lesion areas of the control group were remarkably higher than those of the decursin groups. Decursin decreased the protein levels of OPN. The expression of OPN, the proliferation ability, and the level of IL-6 of RAW264.7 cells were increased after treated with LPS. Decursin inhibited these effects. Conclusion: Decursin suppressed the expression of OPN and inhibited the progress of the periapical periodontitis.

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Comparative Study on Mesial Buccal Root of First Permanent Maxillary Teeth between Tibetans and Hans through CBCT

DU Qilian, LI Ziyan, YUAN Xing, TANG Can

2021, 37(3): 218-221. DOI: 10.13701/j.cnki.kqyxyj.2021.03.008

Abstract ( 181 )

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Objective: To compare the mesial buccal root of the first maxillary molars of Tibetan and Han adults, and provide a reference for clinical root canal treatment. Methods: The 440 CBCT images of the mesial buccal root of the first maxillary molars of Tibetans and Hans were collected randomly. Root length, curvature, bending position, the possibility of second buccal root (MB2), and MB-MB2 distance were measured. Results: The mesial buccal root length of Tibetan was longer than that of Hans (P<0.05). There was a statistical difference in the bending degree of the root canal in the mesial buccal roots between Tibetan and Han people. The majority of the Han people were grade 2 (10°<the bending degree of the root canal <30°), while the Tibetans were grade 2 and grade 3 (the bending degree of the root canal >30°). There was a statistically significant difference between the Tibetan and Han nationalities on the mesial buccal root canal bending position (P<0.05). There was no statistically significant difference in the incidence of MB2 and distance of MB-MB2 between Tibetan and Han people. Conclusion: The root length of the buccal root, the curvature of the root canal, and the position of the root canal are different. The Tibetan tooth root is longer and the curvature is greater, especially at the apical area. There was no difference between MB2 incidence and MB-MB2 distance between Tibetans and Hans.

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Research on Computer Aided Design of Personalized Pulp Opening Guide Template

YANG Xin, FAN Yawei

2021, 37(3): 222-226. DOI: 10.13701/j.cnki.kqyxyj.2021.03.009

Abstract ( 261 )

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Objective: To establish the design and manufacturing method of personalized pulp opening guide template based on CBCT data and design software. Methods: A volunteer was taken CBCT and MIMICS17.0 was imported to extract the three-dimensional model of the target tooth. The shape of the pulp cavity was separated. The inner tube was designed in UG8.0 and inserted into the appropriate position of the three-dimensional model of the tooth. Finally, the inner tube and the three-dimensional model of the tooth were led into 3-matic9.0 together to make a personalized pulp opening guide template. Results: The models of 21, 25, and 26 were successfully designed. Conclusion: The combination of MIMICS, UG, and 3-matic software can effectively design the personalized pulp opening guide template with arbitrary hole shape, and realize the personalized guide template assisted pulp opening in root canal therapy.

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A Retrospective Study on Vertical Change during Two-phase Treatment for Class Ⅱ Division 1 Malocclusions

XU Ruojun, MA Qinqin, FAN Xuemin, MO Shuixue

2021, 37(3): 227-231. DOI: 10.13701/j.cnki.kqyxyj.2021.03.010

Abstract ( 198 )

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Objective: To evaluate the changes of vertical dimension in class Ⅱ¹ malocclusions during two-phase treatment and explore the method of vertical control with Twin-block functional orthopedic treatments preliminarily. Methods: The treatment changes were evaluated by retrospectively analyzing the Pre- and posttreatment's lateral cephalograms of 20 adolescents with class Ⅱ¹ malocclusions who were treated with Twin-block functional orthopedic treatments and fixed orthodontic treatment for two-phase treatment. Results: SN-OP, SN-FOP, IMPA, UADH, UPDH, LADH, and LPDH increased, while U1-SN decreased during phase-I treatment (P<0.05). FHI, U6-SN, and UPDH increased while SN-MP and SN-FOP decreased during phase-Ⅱ treatment (P<0.05). FHI, SN-OP, MPA, UADH, UPDH, LADH, and LPDH increased while SN-FOP, U1-SN, and U6-SN decreased after two-phase treatment (P<0.05). The changes of skeletal indexes had a certain degree of correlation with the changes of dental and occlusal indexes in vertical dimension. Conclusion: There was no evidence of adverse vertical change caused by functional orthopedic treatments with Twin-block appliance. The key to vertical control in functional orthopedic treatments may be the occlusal plane, especially UADH.

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Impact of Oral Appliance Treatment for Moderate Mandibular Advancement on Obstructive Sleep Apnea Syndrome and Upper Airway Volume

SUN Bohui, SUN Zhichao, DONG Xiaochen, WANG Mengmeng, SUN Maiqing

2021, 37(3): 232-236. DOI: 10.13701/j.cnki.kqyxyj.2021.03.011

Abstract ( 192 )

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Objective: To investigate the impact of moderate mandibular advancement device (MAD) on obstructive sleep apnea syndrome (OSAS) and upper airway volume. Methods: 57 OSAS patients underwent oral appliance therapy with MAD in Henan Province Hospital of TCM from June 2017 to September 2018 were enrolled. Indicators of symptoms and signs were compared between baseline and 6 months after treatment. Nasal resistance, airway volume, and in situ cross-sectional area were recorded. Based on apnea hypopnea index (AHI) reduction, the treatment response was classified as complete, partial, and non-complete. The influencing factors of treatment outcomes 6 months after MAD therapy, and upper pharyngeal airway patency and nasal resistance with and without MAD in situ were analyzed. Furthermore, multivariate analysis was carried out on the predictors. Data were processed by SPSS20.0 software. Results: The average age of male was smaller than that of female. The proportions of married and educational level above college degree were higher in male than in female (P<0.05). Age and post-treatment AHI of complete response group were lower than those of partial/non-complete response group (P<0.05). While the AHIsupine and overbite were higher than those of partial/non-complete response group (P<0.05). The AHI, AHIsupine, and oxygen saturation (SaO₂) were lower than 90%. Snoring, snoring symptoms, sleep quality, and total nasal inspiratory resistance of data after 6 months therapy/MAD in situ were lower than those of data without MAD in situ (P<0.05). The nasopharynx volume, oropharynx volume, hypopharynx volume, minimum cross-sectional area, and total pharyngeal airway volume were higher than those of data without MAD in situ (P<0.05). Convex profile had a positive correlation. Increased lower facial height and laryngopharyngeal reflux were negatively correlated with the increase in total upper airway volume (P<0.05), and there was no significant correlation with other indicators (P>0.05). Conclusion: Excellent MAD therapy outcomes are achieved in most patients. After treatment, the increase in airway volume is positively correlated with convex profile, and negatively associated with increased lower facial height and laryngopharyngeal reflux.

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Geometric Morphology Analysis of Bonwill Triangle in Liaoning Han Nationality Adults Based on EDMA

YIN Yanan, LIU Dahua, XU Zejun, REN Fu

2021, 37(3): 237-241. DOI: 10.13701/j.cnki.kqyxyj.2021.03.012

Abstract ( 182 )

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Objective: To measure the geometric shape of the Bonwill triangle of the mandible after 3D reconstruction and to analyze the differences of diverse vertical bone face shapes of the Bonwill triangle. Methods: The study involved the performance of 128-slice spiral CT scans on 72 Han adults in Liaoning and input these CT data into Invivo 5.3 for 3D reconstruction and 3D coordinate measurement of landmarks. WinEDMA 1.0.1 was used to analyze the differences between 3D landmarks. Bootstrap non-parametric test was used to analyze the result. Results: It was found that the Bonwill triangle of each bone face type of Liaoning Han adult had symmetry. However, the differences between each vertical bone face type were significant (P<0.05). The depth of the left faces of Liaoning Han adults decreased in the order of the average angle type to the high angle type, then to the low angle type. The depth of the right faces of the Liaoning Han adults decreased in the order of the high angle type to the average angle type, then to the low angle type. The widths of the mandibular condyles of Liaoning Han adults' faces decreased in the order of the low angle type to the high type, and then to the average angle type. Conclusion: The research provides a theoretical basis for the craniofacial features of vertical bone-face types in different regions.

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Efficacy of Naproxen Sodium Combined with Codeine Phosphate on Pain and Edema following Extraction of Mandibular Impacted Wisdom Tooth

XIE Hongliang, TANG Jianming, LU Lu, LI Bohan, WANG Mengmeng

2021, 37(3): 242-245. DOI: 10.13701/j.cnki.kqyxyj.2021.03.013

Abstract ( 234 )

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Objective: To compare the clinical efficacies of naproxen sodium combined with codeine phosphate, losoprofen, and ibuprofen in the treatment of pain and edema following mandibular impacted wisdom tooth extraction. Methods: 90 healthy volunteers who asked impacted wisdom tooth extraction were randomly distributed into three groups. 1 hour before and 2 to 7 days after tooth extraction, patients were administrated separatly with naproxen sodium+codeine phosphate tablet, losuprofen, or ibuprofen. The postoperative pain, edema, and trismus were recorded and analyzed. Results: Naproxen sodium combined with codeine phosphate was found to be more effective for pain, edema, and trismus compared to losuprofen and ibuprofen (P<0.05). Losuprofen yielded similar clinical responses to ibuprofen (P>0.05). Conclusion: Naproxen sodium combined with codeine phosphate can be used as a better choice for the treatment of pain, edema, and trismus after mandibular impacted wisdom tooth extraction.

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Diagnosis and Treatment of Mandibular Osteomyelitis Caused by Pericoronitis of Mandibular Second Molars in Children

ZHANG Ligang, YI Jie, ZHANG Nini, YAO Li, HUANG Guilin, HU Xiaohua, DAI Min, REN Xiaoqing

2021, 37(3): 246-249. DOI: 10.13701/j.cnki.kqyxyj.2021.03.014

Abstract ( 204 )

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Objective: To investigate the clinical characteristics and treatment of mandibular osteomyelitis caused by pericoronitis of the second molar in children. Methods: From January 2016 to March 2019, a total of 10 children with osteomyelitis of mandible caused by pericoronitis of mandibular second molars were admitted and treated. The average age was 12.1 years old, and the clinical manifestations were facial swelling, stiffness, and limited mouth opening. All 10 patients underwent "mandibular osteomyelitis exploration and curettage biopsy and pericoronal gingival flap resection" under general anesthesia to prevent "extraction of mandibular third molars". The lesions occurred in mandibular body, mandibular angle and ascending ramus, mainly in buccal side. Bone destruction was observed in 9 cases. Extensive osteosclerosis with periosteal new bone parallel to the jaw bone was seen in 10 cases. Results: All 10 patients had good postoperative oral wound healing. The facial swelling subsided and mouth opening improved. The CBCT reexamination 3 months later showed that the area of bone defect was gradually reduced, and the anatomical structure of the diseased jaw could be reshaped close to normal. Conclusion: The patients with mandibular osteomyelitis caused by pericoronitis of mandibular second molars generally are children. Early diagnosis and treatment are helpful to prevent the destruction and aggravation of mandible and to avoid mandible developmental malformation, pathological fracture, and facial malformation. Curettage of mandibular osteomyelitis through an internal incision can achieve good clinical results for the lesions of buccal lesions.

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Finite Element Modeling and Biomechanics Analysis of Cystic Lesions in Mandibular Central Junction Part

PANG Yaqian, LIU Liang, FENG Dajun, LI Jie, WANG Dong, ZHANG Kai

2021, 37(3): 250-254. DOI: 10.13701/j.cnki.kqyxyj.2021.03.015

Abstract ( 177 )

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Objective: To establish a three-dimensional finite element model and to investigate the biomechanical characteristics and stress distribution of the cystic lesion in the mandibular central junction part. Methods: A three-dimensional finite element model with cystic lesions in the mandibular central junction part was constructed, based on the spiral CT scan data of a healthy adult female volunteer with normal occlusion relationship, using Mimics, Geomagic Studio, and other software. The relationship between bone resorption in the lesion area and potential risk of pathological fracture under certain constraints and loads was analyzed. Results: The finite element model that can reflect the characteristics of the cyst was established. When the size of the cyst in the mandibular central junction part reached 38.18 mm×9.53 mm×23.49 mm under functional load, the Von Mises value in the stress concentrated area reached 81.205 Mpa, which was close to the yield strength of bone materials, and the critical bone mass in the lingual side, the lip side, and the lower margin of the mandible were 1.33 mm, 0.66 mm, and 1.69 mm, respectively. Conclusion: From the perspective of biomechanics, the strength of jaw significantly reduced due to a wide range of absorption of cortical bone. The remaining bone thickness in the lingual side, lip side, and lower margin of mandible may provide a reference for the development of one-stage decompression combined with two-stage curettage surgical treatment.

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Preliminary Study on Autologous Tooth Transplantation in Three Different Stages of Alveolar Socket

Reyisha·ABUDUKEYIMU, JIANG Chunyan, Ailimaierdan·AINIWAER, LI Yunyi, Adili·MOMING, WANG Ling

2021, 37(3): 255-259. DOI: 10.13701/j.cnki.kqyxyj.2021.03.016

Abstract ( 170 )

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Objective: To evaluate the efficacy of autologous tooth transplantation at three different times after tooth extraction. Methods: 64 patients with posterior tooth loss were selected from the outpatient Department of Maxillofacial Surgery, Affiliated Stomatological Hospital of Xinjiang Medical University from June 2019 to December 2019. The patients were grouped according to the time of tooth loss as follows: 22 cases of fresh alveolar socket group, 21 cases of early alveolar socket group, and 21 cases of artificial alveolar socket group. Autologous tooth transplantation was performed respectively. Intraoperative time and fitting times of the donor teeth were recorded, and the efficacy of the donor teeth was reviewed at 1, 3, 6, 9, and 12 months after the operation. Clinical specialist examination and dental film were taken to evaluate the perioperative status, root healing, and root resorption of the transplanted teeth. Results: There was no statistically significant difference in the efficacy of three groups 12 months after transplantation (P>0.05). Both fresh alveolar and early alveolar were superior to artificial alveolar in root healing (P<0.05). The root resorption of transplanted teeth with artificial alveolar implants was nearly half, with no significant difference to the early alveolar implants (P>0.05) but significant to the fresh alveolar implant (P<0.05). Other indicators, such as intraoperative indicators (detached time of donor tooth, number of donor tooth fitting), PD, AL, and patient satisfaction, showed no significant difference (P>0.05). Conclusion: Fresh alveolar fossa, early alveolar fossa, and artificial alveolar fossa can achieve high success rate and close curative effect.

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Effect of β-TCP Combined with Oral Repair Membrane on Bone Defect Restoration after Jaw Cyst Excision

WANG Pengcheng, CHEN Chunhui, TONG Xi, FU Xinhai

2021, 37(3): 260-263. DOI: 10.13701/j.cnki.kqyxyj.2021.03.017

Abstract ( 186 )

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Objective: To analyze the effect of β-tricalcium phosphate artificial bone (β-TCP) implantation and oral repair membrane covering on bone defect restoration after jaw cyst excision. Methods: 116 patients with jaw cyst in our hospital from July 2018 to September 2019 were selected and randomly divided into control group and observation group, with 58 cases in each group. The control group underwent curettage after cyst excision, however, the observation group was filled with β-TCP and covered with membrane after the curettage. The clinical efficacy, computed tomography (CT) value of bone defect area, and postoperative recovery of the lost function teeth were compared between two groups. Results: After the operation, the total effective rate of observation group was obviously higher than that of control group (P<0.05); at 3 months after operation, the CT values of the defect area in both groups were obviously higher than those before the operation (P<0.05); at 6 months after operation, the CT values of the defect area were obviously higher than those at 3 months after operation and before operation (P<0.05), and the recovery of the affected teeth in both groups was obviously better than that at 3 months after operation (P<0.05); at 12 months after the operation, the CT values of the defect area and the recovery of affected teeth in both groups were obviously higher and better than those at 3 and 6 months after operation and before operation (P<0.05); at 3, 6, and 12 months after operation, the CT values of bone defect area and the recovery of affected teeth in the observation group were obviously higher and better than those in the control group (P<0.05). Conclusion: The use of β-TCP combined with oral repair membrane can effectively promote osteogenesis and tooth recovery in patients with jaw cyst.

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Short-term Observation of Implant Restoration Following Minimal Flap and Ridge Preservation at Molar Extraction Sockets with Severe Periodontitis

XU Tao, LI Liman, LIU Yunsong, WEI Yiping, HU Wenjie

2021, 37(3): 264-268. DOI: 10.13701/j.cnki.kqyxyj.2021.03.018

Abstract ( 189 )

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Objective: To evaluate the effects of implants following minimally invasive extraction and minimal flap in ridge preservation at molar extraction sockets with severe periodontitis after 1 year load. Methods: Eighteen patients with a total of 20 molar extraction sockets were recruited in the study from January 2015 to January 2017. At 1-month (baseline) and 1-year post-load,each implant was examined with the following parameters: plaque index (Silness & Leo Plaque Index,PLI), peri-implant probing depth (PPD), bleeding index (Mazza,BI), and width of keratinized tissue (KTW). Parallel periapical radiographs were taken at baseline and 1-year post-load to evaluate the peri-implant marginal bone loss (MBL). Results: The survival rate and success rate were 100% for 20 implants. There were no statistically significant differences in the PLI, PPD, BI, and KTW between baseline and 1-year post-load (P>0.05). MBL was (0.12±0.24) mm(P>0.05). Conclusion: The clinical outcomes of implant restoration were favorable following minimal flap and ridge preservation at molar extraction sockets with severe periodontitis after 1-year load.

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Social Impact of Articles Published by Chinese Authors in Oral Implantology during the Past Three Years

WU Xinyu, YAN Qi, HUA Fang, SHI Bin

2021, 37(3): 269-272. DOI: 10.13701/j.cnki.kqyxyj.2021.03.019

Abstract ( 170 )

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Objective: To analyze the social impact of oral implantology articles published by Chinese authors in recent three years and its associated factors. Methods: PubMed was searched to identify oral implantology articles published during 2017 to 2019, with at least one author from China mainland. Altmetrics Attention Score (AAS) was used to quantify the social impact of articles. Generalized estimation equation analysis was used to investigate the association between AAS and potential factors. Results: Overall, 324 articles were included, the mean (range) AAS was 0.76 (0-30). Clinical studies (OR=1.04, 95%CI: 1.01-1.07, P=0.007), high-level evidence (OR=1.12, 95%CI: 1.08-1.51, P<0.001), and open access articles (OR=1.12, 95%CI: 1.07-1.17, P<0.001) were associated with higher AAS. Conclusion: The social impact of oral implantology articles published by Chinese authors needed improvement.

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Tessier No.6 Cleft with Double Dentition: A Case Report

CAO Yongqing, WANG Yujiang, ZHU Zhinong, XU Yong

2021, 37(3): 273-274. DOI: 10.13701/j.cnki.kqyxyj.2021.03.020

Abstract ( 166 )

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Oblique facial cleft is a rare malformation of the maxillofacial region, which is mainly manifested as a single or composite fissure deformity of the craniofacial soft tissue and bone, and may be accompanied with other deformities such as multiple teeth. The pathogenesis that may be caused by genetic or environmental factors is unclear. This article reports a case of Tessier No.6 cleft with double dentition found in the clinic, which has certain clinical reference value.

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