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Objective To evaluatethe detection rate, typing, and therapeutic effect of second mesiobuccal canals(MB2) of first molars under dental operating microscope.Methods 88 maxillary molars with the presence of MB2 through cone beam computed tomography (CBCT) were collected, in which 68 were received root canal treatment and 20 were received root canal retreatment because of the missing canal of MB2 respectively. The type of mesiobuccal root canal in the former 68 maxillary molars were analyzed under CBCT. The 68 maxillary molars were divided into 2 groups, with 34 in each group. The experienment group received treatment under dental operating microscope, while the control group under naked eyes. MB2 detection rate, treatment and retreatment effect between two groups were compared. The latter 20 maxillary molars were also seperated into 2 groups, in which 10 cases were treated under microscope and 10 cases were treated under naked eye. The effect of retreatment was observed.Results The type of mesiobuccal root canal in 68 maxillary molars under CBCT were mainlytypeⅡand typeⅢ, with the proportion of 77.9% (53 cases) and 22.1% (15 cases) respectively. The detection rate of MB2 in the experimental group was 100%, and 91.2% (30 cases) in the control group, a statistical difference can be found between 2 groups (P < 0.05). 97.5% (33 cases) of the experimental group was successfully treated, and 79.4% (27 cases) for the control group (P < 0.05). The success rate of retreatment under microscope was 60% (6 cases), which was significantly higher than that of the naked eye (P < 0.05). In 3-month and 6-month follow-up, the treatment effect in experimental group was significantly better than the control group (P < 0.05).Conclusion Dental microscope can help to increase MB2 detection rate and improve treatment and retreatment effect.

Objective To investigate the anatomical features of alveolar bone in gummy smile patients with cone beam computed tomography (CBCT), and provide the reference for miniscrews implanted in anterior alveolar crest.Methods A total of 63 cases of adults with gummy smile were selected for the study and the CBCT data of jaw bones were obtained. The mesiodistal interradicular distances, buccal-lingual thickness and buccal cortical bone thickness were measured at three different level which included 4 mm,6 mm and 8 mm above the alveolar crest.Results The mesiodistal interradicular distances increased along with distance between measure level and alveolar crest.(P0.05). The buccal cortical bone thickness increased along with distance between measure level and alveolar crest (P

The progression of atherosclerotic plaque is one of the most important causes of cardiovascular events in patients with atherosclerotic cardiovascular diseases (ASCVD). With the help of intravascular imaging, such as intravascular ultrasound (IVUS), optical coherence tomography (OCT) and near-infrared spectroscopy (NIRS), it is possible to show the details of the plaque morphological characteristics. Current research suggested that lipid-lowering drugs lead to plaque stabilization and regression mainly by reducing low-density lipoprotein cholesterol (LDL-C). This review focuses on the effects of lipid-lowering therapy on coronary atherosclerotic plaque evaluated by intravascular imaging.