Factors affecting the clinical success rate of miniscrew implants for orthodontic treatment / 中国组织工程研究

ABSTRACT

BACKGROUND: During the orthodontic treatment, the results of related reports on potential risk factors affecting the clinical success rate of miniscrew implants are inconsistent. The influential factors that clinicians concern are not all included in this study, and the conclusions from animal experiments are difficult to apply to clinical practice directly. Therefore, what factors affect the clinical success rate of miniscrew implants need further thorough and systematic research. OBJECTIVE: To investigate the factors that influence the clinical success rate of miniscrew implants used as orthodontic anchorage. METHODS: A total of 114 patients with oral implants, including 42 males and 72 females, aged (19. 26±9. 19) years were included in this study. A total of 253 miniscrew implants were implanted as orthodontic anchorage. The following influential factors were included Gender, age, vertical skeletal facial pattern, implant site, implant arch, soft tissue type at the implant site, oral hygiene status, diameter and length of the miniscrew implants, implantation method, implantation angle, stress loading timing and intensity, and clinical use. Logistic regression analysis was used to study the correlation between success rate and all variables. Analysis of variance was used to test the effect of each variable on clinical success rate. This trial protocol was approved by the Medical Ethics Committee of Sichuan University. RESULTS AND CONCLUSION: Among 253 successful miniscrew implants, the overall success rate was 88. 54% with an average loading period of 9. 5 months. The average loading period of the 29 failed miniscrew implants was 2. 3 months. The chi-square test, Fisher exact test and Logistic regression revealed that age, oral hygiene, vertical skeletal facial pattern, and implant site were significantly correlated with clinical success rate (P 0. 05). These results suggest that to minimize the failure of miniscrew implants, proper oral hygiene instruction and effective supervision should be given to patients, in particular to those young (< 12 years) high mandibular plane patients.