The Effect of Bone Quality on Tibial Component Migration in Medial Cemented Unicompartmental Knee Arthroplasty. A Prospective Cohort Study Using Dual X-Ray Absorptiometry and Radiostereometric Analysis

BackgroundPeriprosthetic bone mineral density (BMD) may influence implant fixation and subsequent loosening. Unicompartmental knee arthroplasty (UKA) restores normal knee kinematics and load distribution to the surrounding bone. We studied the influence of systemic and periprosthetic BMD of the proximal tibia on migration of the tibial component of cemented medial UKA.MethodsThe cohort was dichotomized into a normal BMD group (T-score ≥ −1; n = 37) and a low BMD group (T-score < −1; n = 28) according to World Health Organization criteria. BMD of the proximal tibia and migration of the tibial component were measured with dual X-ray absorptiometry scans and stereoradiographs with 2-year follow-up.ResultsPatients with normal systemic BMD had an 11% to15% higher BMD in all regions of interest (ROIs) compared to patients with low systemic BMD throughout follow-up. Over time, a decrease in periprosthetic BMD in ROI 1-3 was seen for both groups. The operated knees and contralateral knees showed a similar reduction in BMD in all ROIs between preoperative and 24 months.Between 12 and 24 months, the normal BMD group migrated (maximal total point motion) 0.03 mm (95% confidence interval, −0.01, 0.08) and the low BMD group migrated 0.02 mm (95% confidence interval, −0.03, 0.07). Migration over time was not influenced by change in periprosthetic BMD.ConclusionMigration of cemented medial tibial UKA was low until 24 months and was neither affected by preoperative systemic BMD nor affected by postoperative change in periprosthetic BMD. This suggests good long-term fixation despite an index difference in proximal tibial BMD.     

Patient satisfaction with occlusal scheme of conventional complete dentures

Occlusal scheme is a controversial topic that has been linked to patient satisfaction with conventional complete dentures (CCDs). This study aimed to compare the patient satisfaction with CCDs with four different occlusal schemes namely the lingualised occlusion (LO), buccalised occlusion (BO), fully bilateral balanced occlusion (FBBO) and partially group function occlusion (PGFO). In this clinical study, new CCDs were made for 121 patients; out of which, 97 patients (mean age of 57.87 ± 9.5 years) completed the 1-year follow-up. The CCD wearers were followed up at 1 month, 3 months and 1 year after CCD delivery. Data were collected via an interview and recorded in a checklist by a blinded examiner. The checklist included the demographic variables, the 19-item version of Oral Health Impact Profile for Edentulous Patients (OHIP-EDENT), and seven 100-mm line visual analogue scales (VASs) to assess the items related to patient satisfaction. The Kruskal-Wallis and Friedman tests followed by post hoc tests were used to compare the variables among the 4 groups and between the 3 follow-ups. P-value ≤ .05 was considered statistically significant for all tests. The patients with BO presented higher satisfaction scores for comfort, stability and retention at the 1-year follow-up compared with PGFO. Both PGFO and FBBO groups had higher physical pain scores compared with BO and LO. The psychological discomfort scores of FBBO group were significantly higher than those in LO group. Pairwise comparisons revealed no significant differences in the general patient satisfaction and total OHIP-EDENT scores between the 4 groups. For most items, within-group analysis showed significant improvement of the satisfaction scores and reduction of domain scores over time.     

上颌窦内提升术在口腔种植修复治疗对患者种植体成功率和牙周健康状况影响

目的 探讨口腔种植修复中采用上颌窦内提升术对种植体成功率及牙周健康指标的影响。方法 选取2014年6月—2016年1月山东省青岛疗养院收治的上颌前磨牙或磨牙缺损实施口腔种植修复治疗的患者80例进行回顾性分析。根据治疗方法分为A组40例（采用上颌窦内提升术实施种植修复）、B组40例采用常规种植修复技术。对比两组术后1年、2年种植体留存率、术后不同时间点种植体周围骨吸收量、牙周菌斑指数、探诊深度、龈沟出血指数。结果 术后1个月、术后6个月和术后12个月A组患者的种植体周围骨吸收量显著的高于B组；术后24个月，A组和B组患者的种植体周围骨吸收量差异不具有统计学意义；术后6个月，A组患者的牙周菌斑指数、探诊深度、龈沟出血指数均显著的低于B组；术后1年，A组和B组患者的种植体留存率比较，差异不具有统计学意义；术后2年，A组患者的种植体留存率96.00%高于B组患者的83.02%。 结论 口腔种植修复中采用上颌窦内提升术有利于促进种植体周围骨吸收、提高种植体的留存率、降低种植修复对牙周健康的损害程度。     

Caffeic Acid–coated Nanolayer on Mineral Trioxide Aggregate Potentiates the Host Immune Responses,Angiogenesis, and Odontogenesis

IntroductionThe aim of this study was to investigate whether mineral trioxide aggregate (MTA) can be modified with caffeic acid (CA) to form caffeic acid/mineral trioxide aggregate (CAMTA) cement and to evaluate its physicochemical and biological properties as well as its capability in immune suppression and angiogenesis.MethodsMTA was immersed in trishydroxymethyl aminomethane buffer with CA to allow coating onto MTA powders. X-ray diffractometry and tensile stress-strain tests were conducted to assess for physical characteristics of CAMTA and to evaluate for successful modification of MTA. Then, the CAMTA cement was immersed in simulated body fluid to evaluate its hydroxyapatite formation capabilities and Si release profiles. In addition, RAW 264.7 cells and human dental pulp stem cells were used to evaluate CAMTA’s immunosuppressive capabilities and cell responses, respectively. hDPSCs were also used to assess CAMTA’s angiogenic capabilities.ResultsThe X-ray diffractometry results showed that CA can be successfully coated onto MTA without disrupting or losing MTA’s original structural properties, thus allowing us to retain the initial advantages of MTA. CAMTA was shown to have higher mechanical properties compared with MTA and had rougher pitted surfaces, which were hypothesized to lead to enhanced adhesion, proliferation, and secretion of angiogenic- and odontogenic-related proteins. In addition, it was found that CAMTA was able to enhance hydroxyapatite formation and immunosuppressive capabilities compared with MTA.ConclusionsCAMTA cements were found to have improved physicochemical and biological characteristics compared with their counterpart. In addition, CAMTA cements had enhanced odontogenic, angiogenic, and immunosuppressive properties compared with MTA. All of the results of this study proved that CAMTA cements could be a biomaterial for future clinical applications and tissue engineering use.     

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??Obtaining quality photographs of the clinical cases are crucial for case record??communication with the patient or between dentists. Along with the rapid increase of the clinical application of dental microscope in the daily practice??it becomes a challenge of the practitioners to get qualified photographs through an operating microscope. In this paper??the dental microscope history??the differences between microscopic photography and traditional dental photography??microscope equipment and the skills in microscopic photography were discussed in detail??to provide the reference for clinical application of dental microscopic photography.