Prognosis of teeth with external root resorption caused by adjacent impacted teeth / 华西口腔医学杂志

OBJECTIVE@#This study aimed to investigate the prognosis of permanent teeth with external root resorption (ERR) caused by adjacent impacted teeth.@*METHODS@#A total of 75 ERR teeth (permanent teeth) caused by adjacent impacted teeth of 63 patients were included. The prognosis of ERR teeth was analyzed followed by minimally invasive extraction of the adjacent impacted teeth. The time of follow-up was six months. The relationship between prognosis of ERR teeth and patients' age, gender, root number, type of root resorption and degree of root resorption were analyzed.@*RESULTS@#In the 75 ERR teeth, 67 teeth (89.3%) did not show pulpitis symptoms. The clinical outcome was found to be related with age (r=0.330, P0.05). Pulpitis symptom was not found in ERR teeth of patients under 30 years old.@*CONCLUSIONS@#For ERR teeth caused by adjacent impacted teeth, keeping the pulp vital after surgical removal of impacted teeth is highly probable. Post-operative follow-up instead of preventive root canal therapy of ERR teeth is recommended.

Relationship between initial archwire materials and pain at the initial stage of orthodontic treatment: a systematic review and network Meta-analysis / 华西口腔医学杂志

<p><b>OBJECTIVE</b>This review aims to assess the relationship between initial archwire materials and pain at the initial stage of orthodontic treatment.</p><p><b>METHODS</b>On October 1, 2017, seven databases were searched electronically for studies oninitial archwire materials and pain at the initial stage of orthodontic treatment. Quality assessment was performed with bias risk assessment tools suggested by Cochrane's handbook. Data extraction of included studies was also carried out. Network Meta-
analysis was conducted using R 3.4.2 (with JAGS 4.3.0), GeMTC 0.14.3, and STATA 11.0.</p><p><b>RESULTS</b>Five studies with 330 participants were included, comparing four different materials: multi-stranded stainless steel, conventional nickel-titanium, super-elastic nickel-titanium, and thermal heat-activated nickel-titanium. Two studies were at low risk of bias, one was at high risk of bias, and the remaining two were at unclear risk of bias. Network Meta-analysis results showed no statistical differences of pain among the four initial archwire materials at day 1 and day 7. However, the most painless material was most likely to be thermal heat-activated nickel-titanium on rank probability.</p><p><b>CONCLUSIONS</b>On statistical probability, thermal heat-activated nickel-titanium initial arch wires is most likely to cause the least pain at the initial stage of orthodontic treatment, compared with other materials.</p>

Assessment of left ventricular twist in type 2 diabetes mellitus by using two-dimensional ultrasound speckle tracking imaging / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To evaluate the left ventricular twist characteristics in patients with type 2 diabetes by using two-dimensional speckle tracking imaging (STI).</p><p><b>METHODS</b>Ninety-three patients with type 2 diabetes admitted in Zhejiang Hospital from May 2012 to September 2013 were enrolled. According to left ventricular ejection fraction (LVEF), patients were divided into two groups: normal left ventricular systolic function group (group A, LVEF≥0.50, n=46) and abnormal left ventricular systolic function group (group B, LVEF <0.50, n=47). Forty-six healthy subjects were selected as normal controls. STI was applied to quantitatively analyze the left ventricular twist. Correlation of the peak of left ventricular twist angle (Peaktw), aortic valve closure time twist angle (AVCtw), and mitral valve opening time twist angle (MVOtw) with LVEF, Tei index, E/A, and E/e was evaluated. Consistency check for STI was conducted to assess its stability and reliability.</p><p><b>RESULTS</b>The Peaktw, AVCtw, and MVOtw in group A were significantly elevated than those in normal controls (P<0.05). The Peaktw, AVCtw, and MVOtw in group B was lower than those in normal controls and group A (P<0.05). In diabetic patients, the Peaktw, AVCtw, MVOtw were positively correlated with LVEF (r=0.968, 0.966, 0.938;P<0.05) and E/A (r=0.798, 0.790, 0.788; P<0.05), and were negatively correlated with Tei index (r=-0.834, -0.811, -0.797; P<0.05) and E/e (r=-0.823, -0.805, -0.771; P<0.05). The agreement between measurers and within measurers of Peaktw was satisfactory (between measurers: R=0.957, bias=-0.1, 95% consistency limit=-2.8-2.7; within measurer: R=0.964, bias=-0.2, 95% consistency limits=-2.7-2.2).</p><p><b>CONCLUSION</b>STI can be used for early recognition of abnormal changes of cardiac function in type 2 diabetic mellitus patients, with high stability and reliability.</p>

Two-dimensional ultrasound speckle tracking imaging in detection of myocardial torsion for patients with chronic pulmonary heart disease / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To evaluate the application of two-dimensional ultrasound speckle tracking imaging (STI) in assessment of myocardial torsion and left ventricular function for patients with chronic pulmonary heart disease (CPHD).</p><p><b>METHODS</b>Thirty six patients with CPHD and 38 normal subjects were enrolled in the study,and STI examinations were performed. The left ventricular short-axis views (mitral level,apical level) were observed,the rotation angles of the standardized time point were measured at each short-axis views and the corresponding left ventricular torsion angles were calculated. Simultaneously, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were recorded. The correlations of left ventricular ejection fraction (LVEF) with left ventricular torsion peak, end-systolic left ventricular twist value in patients were analyzed.</p><p><b>RESULTS</b>Compared to normal controls, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were significantly lower (P<0.01) in CPHD patients. The LVEF was highly correlated with left ventricular twist peak and end-systolic left ventricular twist value in CPHD patients (r=0.967, 0.952,P<0.001).</p><p><b>CONCLUSION</b>STI is sensitive to detect left ventricular myocardial torsion change; left ventricular torsion peak and end-systolic left ventricular twist value can be used to assess the left ventricular function in patients with CPHD.</p>