RESUMO
Objective:To explore the clinical application effect of open vertical helical loop to correct ectopic eruption of the first permanent molar, and to provide reference for the selection of treatment timing and methods for ectopic eruption of the first permanent molar.Methods:A total of 30 patients with unilateral or bilateral ectopic eruption of maxillary first permanent molars, aged from 7 to 8.5 years old, who visited the Affiliated Hospital of Jining Medical University from 2020 to 2021, were retrospectively selected. The first permanent molars were moved to their normal positions by bonding buccal tubes between the second primary molars and the first permanent molars with a vertical loop. We compared and analyzed the mesial inclination angle of the first permanent molar, the length of the lateral dental arch, and the root resorption status of the second deciduous molar before and after treatment.Results:All 30 patients underwent complete orthodontic treatment, with the first permanent molar adjusted to its normal position. The inclination angle of the first permanent molar after treatment was (91.3±5.1)°, which was statistically significant compared to (78.1±6.3) ° before treatment ( t=-10.023, P=0.014); The length of the lateral dental arch after treatment was (34.0±1.0)mm, which was significantly increased compared to (31.61±1.1)mm before treatment, and the difference was statistically significant ( t=-25.96, P=0.007). After treatment, the degree of root resorption of the affected second molar significantly increased compared to that before treatment (χ 2=12.002, P<0.001); There was no statistically significant change in root resorption before and after treatment of the healthy second molar ( P=0.818). Conclusions:The use of open vertical helical loop correction for ectopic eruption of maxillary first permanent molar can effectively adjust the mesial inclination angle of patients with ectopic eruption of maxillary first permanent molar. However, close attention should be paid to the root resorption of the second primary molar, and early detection and treatment should be carried out in clinical practice. If the root resorption of the second primary molar is severe after treatment, a retainer should be made in a timely manner to maintain the arch length.
RESUMO
Introduction : Le but de la présente étude est d'évaluer le taux de succès et les facteurs affectant le pronostic de l'auto-transplantation immédiate de la troisième molaire mandibulaire, au site de la première ou la deuxième molaire homolatérale après un suivi clinique et radiologique sur une période de trois ans. Matériel et méthodes : Un total de 90 troisièmes molaires mandibulaires ont été immédiatement transplantées pour remplacer la première ou la deuxième molaire homolatérale jugées non restaurables. Le stade de développement des molaires auto-transplantées varie de 3 à 7 selon la classification de Moorrees. Pour les molaires matures, le traitement canalaire est réalisé 1 à 2 semaines plus tard. A l'issue des contrôles cliniques et radiographiques des troisièmes molaires transplantées échelonnés selon un calendrier prédéfini, des statistiques descriptives ainsi que l'analyse du taux de réussite et des facteurs affectant le pronostic ont été réalisées. Résultats : L'âge moyen des patients était de 22,80 ans. Le taux de succès est de 87,8%. Le taux de réussite de l'auto-transplantation des troisièmes molaires immatures et matures est respectivement de 91,2% et de 81,8%. Le taux d'échec est de 12,2%.Le temps extra-alvéolaire apparait comme la cause principale des complications. Parmi les 11 transplantations considérées comme un échec, la résorption radiculaire externe est la manifestation principale représentée par 8 cas, suivi de 2cas d'ankylose et d'un cas d'expulsion du transplant. Conclusion : L'auto-transplantation immédiate des troisièmes molaires mandibulaires au site de la première ou de la deuxième molaire homolatérale est une solution viable et une alternative à la réhabilitation prothétique conventionnelle ou au traitement implantaire d'un point de vue thérapeutique et économique.
Introduction: The aim of the present study was to evaluate the success rate and to the factors affecting the prognosis of the immediate auto-transplantation of the mandibular third molar, in homolateral first or second molar site after clinical and radiological follow-up over a period of three years. Material and methods: A total of 90 mandibular third molars were immediately autotransplanted to replace homolateral lost first or second molar. The development stage of autotransplanted molars varied from 3 to 7 according to Moorrees. Root canal treatment began for mature molars 1 to 2 weeks later. Clinical and radiographic checkup of the transplanted third molars were done according to predesigned record form. Descriptive statistics and statistical analysis about success rate and to the factors affecting the prognosis were performed. Results: The mean age of treated patients was 22.80 years. The success rate was 87.8%. The success rates of the auto-transplantation of third immature and mature molars were 91.2% and 81.8%, respectively. The failure rate is 12.2% and extra-alveolar time appears as the main cause of complications. In all, 11 transplants were considered a failure. External radicular resorption appeared to be the principal manifestation with 8 cases, followed by 2 cases of ankylosis and 1 of transplant expulsion. Conclusion: Immediate auto-transplantation of the mandibular third molar teeth in homolateral first or second molar site is an interesting treatment alternative to conventional prosthetic rehabilitation or implant treatment in cases of lost molars from both a therapeutic and an economic point of view.