Cementum and dentin repair following root damage caused by the insertion of self-tapping and self-drilling miniscrews

Abstract

OBJECTIVE:The aim of this study was to evaluate the histological responses of cementum, root dentin, and pulp following intentional root injuries caused via self-tapping and self-drilling miniscrews.MATERIALS AND METHODS:Fourteen patients (with a mean age of 15.7 years and age range of 14–18 years) who were scheduled for the extraction of all four first premolars as part of their orthodontic treatment plan participated in this study. The roots of the right and the left quadrants' first premolars were designedly injured using self-tapping miniscrews and self-drilling miniscrews, respectively. Teeth were extracted eight weeks after the injury. Cementum repair was assessed through histological examinations.RESULTS:In this study, 40 teeth (75.4%) showed reparative cementum formation and 13 teeth (24.5%) showed no repair. There was no significant difference between the two groups regarding the formation of reparative cementum (P = 0.3). In all examined teeth, the inflammatory response of the pulp to the cold test was within the normal range.CONCLUSION:This study showed that in most cases, the healing of cementum was observed eight weeks after the injury and the two methods of miniscrew insertion showed no significant difference when it comes to the healing process.

Novel Digital Technique to Analyze the Influence of the Operator Experience on the Accuracy of the Orthodontic Micro-Screws Placement

“…Ghanbarzadeh et al reported that most of the dental root perforations performed through self-tapping and self-drilling orthodontic micro-screws showed reparative cementum formation, while 24.5% of the dental root process perforations did not show histological signs of tissue reparation. However, all teeth maintained pulp tissue response within the normal range [28]. Gurdan et Szalma reported a success rate for Jeil self-drilling orthodontic micro-screws of 89.8% for an average loading period of 8.1 months; however, the authors related the failure rate of orthodontic micro-screws to the anatomic location placement [29].…”

A Cross-Sectional Study on Mean Perception of Pain after Mini-Screw Placement among Patients Seeking Orthodontic Treatment

“…In a survey of 61 US orthodontists about the usage of miniscrews in private clinics, Celebi F et al discovered that 30.8% of them only employed CTA while inserting mini-screws 6 . The comfort of the patient, the ease of the process for the orthodontist, the absence of tissue swelling to obscure the mini-screw implant site, and feedback from the patient if the mini-screw is put too closely to the root structure are all benefits of using a CTA 7 . The application of skeletal anchorage involves a number of variables, including screw type, insertion site, anaesthetia given, and pre-and postoperative drugs.…”