Objective: To investigate the effects of cortical bone thickness (CBT), miniscrew implant root proximity (MRP) and other related factors on the success rate of miniscrew implant (MSI). Materials and Methods: Four hundred and five MSIs placed in 171 patients were analysed in this retrospective study. The primary predictor variables were CBT and MRP at MSI insertion sites. The predictor variables also included patient, location, MSI design and procedure related factors. The outcome variable was the survival of MSI. The differences in measurement data between success group and failed group were evaluated by the analysis of variance and independent samples t tests. Patient, location, MSI design and procedure related factors associated with the MSI prognosis were analysed by survival analysis with Cox proportional hazard regression model. The P value was set at .05. And the survival curves of independent factors were plotted. Results:The overall success rate of MSI was 82.7%. The age of MSI host, CBT, interdental root distance (IRD) and MRP at MSI sites showed no significant differences between failed group and success group. CBT and insertion jaws were independent prognosis factors screened out by Cox proportional hazard regression model. Failure risk (hazard ratio) of MSI with CBT <1 mm was 4.72. The failure risk in the mandible was 3.80 times as high as that in the maxilla. Conclusion:Inadequate CBT (<1 mm) contributed to the failure of MSI. MSI placed in the maxilla showed better prognosis compared to the mandible. MRP had no significant effect on the prognosis.
Background: The aim of this study was to evaluate psychological distress among orthodontic patients and its relationship to orthodontic emergencies related to different appliances during the COVID-19 lockdown. Methods: This was a cross-sectional online questionnaire survey involving orthodontic patients in Shanghai, China. Data collection occurred from May 15 to June 1 2022. The demographic information and orthodontic emergencies were collected, while the peritraumatic distress symptoms were assessed by the COVID-19 Peritraumatic Distress Index (CPDI). Data analysis was performed by SPSS software. Results: A total of 480 patients were examined, including 331 fixed appliance patients, 131 clear aligner patients and 18 removable appliance patients. Patients who encountered emergencies and suffered from temporomandibular joint (TMJ) pain reported significantly higher CPDI scores in each group (p<0.01). Multivariate linear analysis showed that patients aged above 18 years old (p<0.01), emergencies in fixed appliance patients (p<0.05), emergencies among clear aligner patients (p<0.01), and higher TMJ-pain scores were significantly associated with increasing CPDI scores. Conclusions: Orthodontic patients encountered emergencies, especially those who suffered from TMJ pain and were at higher risk of psychological distress related to COVID-19; thus, targeted intervention and self-management guidelines should be designed to relieve anxiety and strengthen coping capacity for orthodontic patients during the pandemic.
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