Peri-implant keratinized mucosa (PIKM) augmentation refers to surgical procedures aimed at increasing the width of PIKM. Consensus reports emphasize the necessity of maintaining a minimum width of PIKM to ensure long-term peri-implant health. Currently, several surgical techniques have been validated for their effectiveness in increasing PIKM. However, the selection and application of PIKM augmentation methods may present challenges for dental practitioners due to heterogeneity in surgical techniques, variations in clinical scenarios, and anatomical differences. Therefore, clear guidelines and considerations for PIKM augmentation are needed. This expert consensus focuses on the commonly employed surgical techniques for PIKM augmentation and the factors influencing their selection at second-stage surgery. It aims to establish a standardized framework for assessing, planning, and executing PIKM augmentation procedures, with the goal of offering evidence-based guidance to enhance the predictability and success of PIKM augmentation.
Humans ; Consensus ; Dental Implants ; Mouth Mucosa/surgery* ; Keratins

Objective:To investigate the accuracy of magnetic resonance imaging (MRI) cine sequences in determining the range of tumor motion in radiotherapy, providing a basis for the precise delineation of the target volume in motion for radiation therapy.Methods:A modified chest motion phantom was placed in a MRI scanner, and a water-filled sphere was used to simulate a tumor. True fast imaging with steady precession (TrueFISP) MRI cine sequences from Siemens were used to capture the two-dimensional motion images of the simulated tumor. The phantom experiments were divided into three modes: head-foot motion mode, rotation motion mode, and actual respiratory waveform mode. In the head-foot motion mode, respiratory motion period (3, 4, 5, 6, 7 and 8 s), amplitude (5, 10 and 15 mm), and respiratory waveform of the simulated tumor (sin and cos4) were set, resulting in a total of 36 motion combinations. In the rotation motion mode, a cos4 waveform was used for respiration, with respiratory periods of 3, 4, 5, 6, 7 and 8 s, head-foot motion set amplitudes of 5, 10 and 15 mm, and anterior-posterior (AP) and left-right (LR) motion set amplitudes in three combinations ([2.5, 2.5] mm, [2.5, 5.0] mm, [5.0, 5.0] mm), resulting in a total of 54 motion combinations. In the actual respiratory waveform mode, respiratory waveforms of 5 randomly selected patients from Affiliated Cancer Hospital of Zhengzhou University were obtained. Under each motion combination, TrueFISP cine images (30 frames, with an acquisition time of 11 s per frame) were obtained. The code was used to automatically identify the two-dimensional coordinates of the center of the simulated tumor in each image, and sin and cos4 functions were separately employed to fit the tumor position in the motion direction, thereby obtaining the fitted motion period and amplitude. The difference between the maximum and minimum values of the tumor's center coordinates in the head-to-foot direction is taken as the range of movement, referred to as the calculated amplitude. For the actual respiratory waveform, the distance between the measured maximum and minimum positions is used to calculate the amplitude.Results:In the head-foot motion mode, the fitted amplitudes of both sin and cos4 waveforms deviated from the set amplitudes by 0-0.51 mm, with relative deviations of 0%-4.2%. The deviation range between the calculated amplitudes and the set amplitudes of the two waveforms were 0.08-0.94 mm, with relative deviations of 1.1%-6.3%. In the rotation motion mode, the fitted amplitudes deviated from the set amplitudes by 0-0.61 mm, with relative deviations of 0%-6.2%. And the deviation range between the calculated amplitudes and the set amplitudes were 0.16-0.94 mm, with relative deviations of 0%-6.3%. In the actual respiratory waveform motion mode, the deviation range between the calculated amplitudes and the set amplitudes were 0.10-0.48 mm, with relative deviations of 2.2%-8.6%.Conclusion:TrueFISP cine sequences show minimal deviations in determining the range of tumor head-foot motion and effectively captures the tumor's movement state, thereby providing important support for the precise definition of the tumor movement target area during radiotherapy .

Selection and measurement of clinical outcome are key components of clinical research in implant dentistry. Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine took the lead and collaborated with multiple internationally renowned colleges of stomatology to develop an international consensus on the core outcome set and measurement in implant dentistry, which took two years and was published in May, 2023 in Journal of Clinical Periodontology and Clinical Oral Implants Research simultaneously. The consensus, aiming at identifying the full spectrum of benefits and harms of interventions, provides a comprehensive, agreed, and standardized set of outcomes that should be measured and reported as a minimum in clinical trials relating with implant dentistry, bone augmentation, and soft tissue augmentation. The present review describes the methodology and key elements of the consensus to help Chinese clinical researchers fully understand and appropriately apply the core outcome set and improve the overall quality of Chinese clinical research in implant dentistry.

Objective:To measure the microdosimetric spectrum of carbon ion beam and calculate the relative biological effect (RBE) distribution, so as to provide reference for radiotherapy microdosimetric research.Methods:A silicon on insulator (SOI) microdosimeter was used to measure the microdosimetric spectrum of 12C ion beam, at 260 MeV/u, provided by Lanzhou Heavy Ion Accelerator National Laboratory. The measured pulse amplitude spectrum was converted to obtain the dose distribution. The microdosimetric spectra and RBE values at different polymethyl methacrylate depths were measured by the combination of different thickness PMMA. Results:The microdosimetric spectra of 12C ion beam at 260 MeV/u were measured at different PMMA depths, and the relationship between dose line energy yD and RBE and different PMMA depths was also obtained. The measurement result showed that the RBE value reached a peak of 2.6 at the PMMA depth of 116.5 mm, and decreased rapidly after the Bragg peak. However, the RBE value was still 1.3 at the trailing point, which was about twice as much as the entrance of the flat zone. Conclusions:This paper provides basic data for carbon ion beam microdosimetric spectroscopy through measurement. The RBE value of 12C ion beam gradually rises and reaches a peak with the increase of PMMA depth. After the Bragg peak position, it drops rapidly, but the biological effect at the tail cannot be ignored. At the same time, it reflects the dose fraction caused by different line energy intervals, and provides a reference for assessing the risk of heavy ion therapy for secondary cancer.

Objective: To investigate the clinical characteristics, diagnosis, treatment and prognosis of discordant lymphoma. Methods: The clinical data of one patient with discordant lymphoma at the PLA Strategic Support Force Characteristic Medical Center were retrospectively analyzed, and the related literatures were reviewed. Results: The patient was treated for thrombocytopenia and the examination showed splenomegaly. After hormone treatment, the platelet rebounded and thrombocytopenia occurred during hormone reduction. Splenectomy was performed. Postoperative pathological diagnosis of splenic marginal lymphoma was made and observed. Axillary lymph node enlargement occurred nine months later. Pathological diagnosis of diffuse large B-cell lymphoma was made by using lymph node biopsy, and the disease condition was alleviated after immunotherapy combined with chemotherapy. Conclusions Discordant lymphoma is rare and shows no special clinical manifestations. Its diagnosis should rely on pathological examination. Immunotherapy combined with chemotherapy may be more effective.

Objective To evaluate and explore the diagnostic value of focal liver lesion ( FLL) ( ≤2 cm) undetectable on conventional ultrasound by image fusion with contrast-enhanced ultrasound(CEUS) . Methods A total of 50 patients with 65 lesions( ≤2 cm) were enrolled . All lesions were undetectable on conventional ultrasound but showed clearly in CT/MRI images . Ultrasound-CT/MRI image fusion with CEUS was performed ,and the nodule detection rate and enhancement perfusion mode were analyzed . Results All the 50 patients were matched successfully ,56 lesions (86 .2% ) were detected by image fusion combined with CEUS ,among which 27 lesions (41 .5% ) were significantly different from surrounding parenchyma on conventional ultrasound , 54 lesions ( 83 .1% ) showed different enhancement from the surrounding parenchyma on CEUS . There were 46 lesions that were eventually diagnosed by surgical pathology or clinical comprehensive diagnosis . The diagnostic accuracy of image fusion with CEUS was 91 .3% (42/46) . According to different groups of MRI matching sequences ,the detection rates of T 2 sequence group and enhanced sequence group were 87 .5% (28/32) and 91 .3% (21/23) ,respectively ,there was no statistically significant difference between the two groups ( P ＝0 .686) . Conclusions CT/MRI image fusion combined with CEUS has high detection rate and diagnosis accuracy for small FLL undetectable on conventional ultrasound .

Objective To explore the clinical value of the Liver Imaging Report and Data System ( LI-RADS) with contrast enhanced ultrasound(CEUS) in the diagnosis of hepatocellular carcinoma ( HCC) . Methods From October 2012 to July 2018 , the CEUS data of patients at high risk for HCC were retrospectively analyzed . A total of 197 lesions in 178 patients were classified with reference to the 2017 version of CEUS LI-RADS classification standard . Diagnostic reference standard was surgical pathology . The relationship between the LI-RADS classification and the pathological diagnosis was evaluated . Results One hundred and ninety-seven lesions ,with an average size of ( 2 .9 ± 1 .6)cm ,were pathologically confirmed to be 170 HCC ( 86 .3% ) ,17 non-HCC malignant lesions ( 8 .6% ) ,and 10 liver benign lesions ( 5 .1% ) . There were 6 (3 .0% ) ,37(18 .8% ) ,134 (68 .0% ) and 20 (10 .2% ) lesions classified into LR-3 ,LR-4 ,LR-5 and LR-M category ,respectively . Positive predictive values of HCC in LR-3 ,LR-4 and LR-5 category were 16 .7% (1/6) ,89 .2% (33/37) ,97 .0% (130/134) ,respectively . LR-5 category had high positive predictive value of HCC( 97 .0% ) ,but low sensitivity ( 76 .5% ) . If LR-5 category combined with LR-4 category were diagnosed as HCC ,the diagnostic accuracy was significantly higher than that of LR-5 category ( 92 .4% vs 77 .7% ) ,and the difference was statistically significant ( P ＜ 0 .05 ) . 95 .0% ( 19/20 ) lesions of LR-M category were malignant ,of which 30 .0% ( 6/20 ) lesions were HCC . 76 .9% ( 10/13 ) of intrathecal cholangiocarcinoma was characterized by LR-M . Conclusions The LI-RADS classification of CEUS has high application value for diagnosis and differentiation of HCC .

Background and purpose:In recent years, epigenetics research has become a new direction of cancer research. A large number of results have shown that the abnormal changes of epigenetic modifications have close connection with cancer. Genome-wide epigenetic modifications have become new markers for cancer. This study aimed to investigate the methylation of the promoter ofDBC1 gene in cervical cancer tissues of Uyghur women in Xinjiang, to explore the correlation between the gene methylation and the infection of HPV, and to evaluate whether it can be used as a tool with high sensitivity and specificity for cervical cancer screening.Methods:This study detected the infection of HPV16, 18 in 43 normal cervical tissues, 35 cervical intraepithelial neoplasia tissues and 54 cervical cancer tissues using the polymerase chain reaction (PCR) method. The methylation of the promoter ofDBC1 gene in above-mentioned tissues was detected by the methylation-specific PCR method. The expression ofDBC1 at mRNA level was measured by real-time fluorescent quantitative polymerase chain reaction (RTFQ-PCR) in 10 methylation-negative normal cervical tissues and 10 methylation-positive cervical cancer tissues.Results:In normal cervical tissues, CIN tissues and cervical cancer tissues, the infection ratios of HPV16 were 18.6%, 34.3% and 68.5%, respectively; the infection ratios of HPV18 were 2.3%, 8.6% and 16.7%, respectively; and the methylation ratios ofDBC1 gene were 23.3%, 40.0%, 87.0%, respectively. In 79 high-grade squamous intraepithelial lesions (CINⅡ and Ⅲ) and cervical cancer tissues, 50 of 79 were infected with HPV16/18, while 29 of 79 were negative. The methylation ratio ofDBC1 gene was 88.0% in HPV16/18 infection positive group while the methylation ratio was 55.2% in negative group (P<0.05). The expression ofDBC1 gene at mRNA level in 10 methy- lation-positive cervical cancer tissues was significantly lower than that in the 10 methylation-negative normal cervical tissues (P<0.05).Conclusion:The methylation ofDBC1 gene may become a molecular marker to detect cervical cancer of Uyghur women in Xinjiang.DBC1 gene methylation combined with HPV16/18 infection test can be used to aid diagnosis of cervical cancer.

Objective To compare the clinical target volume (CTV) expanding margins in the mid-and upper-thoracic esophageal carcinoma during radiotherapy measured with and without online image guidance technique by CT on rail.Methods 100 patients with mid-and upper-thoracic esophageal carcinoma undergoing intensity modulated radiotherapy received CT scanning.Image registration was conducted between the scanning results and the planned CT images,thus set-up error data were acquired and got on-line correction.Fifty patients were randomly selected to undergo additional post-treatment CT scanningso as to analyze the revised residuals,displacement during treatment,and infra-fraction GTV shifts.Results Compared to the radiotherapy without CT-based image guidance,the CTV expanding margins obtained with CT-based image guidance was reduced significantly from 9.1,8.8 and 6.1 mm to 4.1,4.5 and 4.3 mm in the left-right,head-feet,and belly-back directions respectively.Conclusions The on-line image-guided technology significantly improves the accuracy of target and reduces the CTV expanding margins.

ObjectiveTo evaluate the effect of external fixator,colostomy,repeated debridement and vacuum-assisted closure (VAC) to treat open pelvic fractures concomitant with perineal laceration and infection.MethodsA retrospective analysis was made about 8 cases of open pelvic fractures concomitant with perineal laceration and infection from February 2004 to January 2011.It includes 7 men and 1 woman,with the average age of 36.3 years(ranged from 22 to 59 years).Five cases were injured by traffic accident,2 cases were fall-down from height,and 1 case was crushed by weight.Fractures type according to Tile:3 cases were type B,5 cases were type C.All cases were type I according to Faringer classification.All patients were treated with external fixator according to the displacement of pelvic fractures,early colostomy,repeated debridement,and after infection be controlled,VAC was used to close wound and drainage.Results The eight cases of open pelvic fractures concomitant with perineal laceration and infection were followed up from 6 to 36 months,with the average of 16 months.The infection was healed in all patients,and the body temperature and blood routine got normal.The period from injury to wound closing was from 8 to 43 days,with the average time of 17 days.According to the Majeed evaluation system,the pelvic fractures healing was evaluated after treatment:2 cases were excellent; 3 cases were good; 2 cases were fair;,1 case was poor;,the good to excellent rate was 62.5％.ConclusionThe method of applying external fixator,colostomy,repeated debridement and VAC to treat open pelvic fractures concomitant with perineal laceration and infection is useful.The methods played an active role in controlling infection,reducing infection rates and mortality rates,and shortening the healing time.