ABSTRACT
OBJECTIVE: Microscrew implants (MSIs) offer many advantages, but some complications are known to occur during their insertion. One of the most commonly reported complications is root injury. Our aim was to identify factors associated with root injury and to evaluate their qualitative and quantitative values. METHODS: Thirty-five orthodontists placed MSIs (AbsoAnchor(R), Dentos Co. Ltd, Daegu, Korea) in the upper jaw of typodonts, labially between the second premolar and the first molar, in low and high vertical positions. Root contacts were counted, and distances between MSI apices and roots were measured. Fear level of the orthodontists was surveyed before and after the experiment. Wilcoxon's test, chi-square test, and Mann-Whitney test were used for statistical analysis. RESULTS: Overall root contact rate of MSI insertion was 23.57%. The root contact rate was significantly higher in MSIs inserted at 90degrees (45.71%) than at 30degrees (1.43%). The distance between the dental root and MSI also increased significantly in MSIs inserted at 30degrees. Mean fear level before MSI insertion (4.6) significantly decreased after insertion (3.2); the causative factors were risk of injury to dental root and maxillary sinus or mandibular canal. CONCLUSIONS: Root injury is relatively rare, and oblique angulation reduces the risk of root and MSI contact.
Subject(s)
Bicuspid , Evaluation Studies as Topic , Jaw , Maxillary Sinus , Molar , SuccinimidesABSTRACT
To provide some guideline for microscrew implants, 73 patients that received a total of 180 mini- or microscrew implants were scrutinized. The overall success rate was 93.3% (168 among 180 mini- or microscrew implants) and the mean period of utilization was 15.8 months. Microscrew implants in the UB group (maxillary buccal area) succeeded at a rate of 94.6% (87 among 92), mini- or microscrew implants in the LB group (mandibular buccal area) succeeded 96.6% of the time (56 out of 58), while microscrew implants in the UP group (maxillary palatal area) had a 100% success rate (11 out of 11), and mini- or microscrew implants in the LR group (retromolar area) succeeded in 73.7% of cases (14 among 19). This study might indicate that microscrew implants can be used successfully as orthodontic anchorage in daily orthodontic practice.
Subject(s)
HumansABSTRACT
Anchorage plays an important role in orthodontic treatment. Endosseous implants may be considered adequate firm anchorage. However, chinicians have hesitated to use endosseous implants as orthodontic anchorage because of limited implantation space, high cost, and long waiting period before osseointegration occurs. Recently, some clinicains have tried to use titanium miniscrews and microscrews in treatment due to their many advantages such as ease of insertion and removal, low cost, immediate loading, and the ability to place microscrews in any area of alveolar bone. The author treated a case with skeletal cortical anchorage using titanium microscrew implants. During six months of orthodontic force application from skeletal cortical anchorage, the author could get 4mm bodily retraction and intrusion of upper anterior teeth. The most outstanding result was a 1.5mm posterior retraction of the upper posterior teeth. The titanium microscrew implants and remained firm and stabel throughout treatment. These results indicate that skeletal cortical anchorage might be a very good option.