Orthodontic Correction of a Mandibular Lateral Incisor and Canine Incomplete Transposition in the Permanent Dentition

Transposition of teeth is a rare type of ectopic eruption and in incomplete transposition the crowns might be transposed, but the root apices still remain in their relatively normal positions. In this report, we describe the orthodontic treatment of a 17-year-old girl with mandibular left lateral incisor and canine incomplete transposition in which the involved teeth were repositioned to their normal anatomic position within the dental arch in an acceptable treatment time period. Treatment procedure, mechanics, and sequencing used and final results are described. The final outcome was stable after 18 months of retention

The Effect of Second Molar Extraction and Septumotomy on Intraoral Molar Distalization - A Pilot Study

This study aimed to evaluate the combined effects of second mo tar extraction and interradicular septum removal on molar distalization, an intraoral distalization mechanism was used, emitting interrupted forces. The study group consisted of 12 Class II adolescents (6 females and 6 males), with a mean age of 15.17. Dental effects were analyzed on lateral cephalograms by means of acrylic caps with indicator wires at 3 stages: Pre-treatment, post-distalization, and 2 months after the distalization. Maxillary first premolar and first molar rotations and intermolar distance changes were evaluated from study models, taken at the same periods. All subjects were extracted the upper second molars, and interradicular septa were removed. At the same time, the mesial socket wall was cut vertically and horizontally. Distalization began the next day with bilaterally positioned compact RPE screws, which were activated once in two days. The mean time for the distalization was 3.25 months. Results showed maxillary first molars distalized 3.21 mm with 7.7° tipping and 4.2° mesial rotation. The anchorage loss was 3.41 mm for premolars, and 4.41 mm for incisors, which was reduced to 0.34 mm in premolars, and 2.16 mm in incisors during the post-distalization period. The inter-molar distance increased 4.42mm during distalization

Comparison of Postoperative Condylar Functions of Orthognathic Surgery Patients with Control Subjects Using SAM Axiograph

Aim:The aim of this study is to compare temporomandibular joint tracings of healthy individuals, who do not manifest any TMD symptoms, with those of the patients who have undergone orthognathic surgery operations after a certain period of time.Subjects and Methods:Fifty adults who have undergone orthognathic surgery operations have been divided into subgroups in accordance with the type of surgery plan and they were compared with the control group without any TMJD, as well as with the other surgery subgroups. SPSS packed programe's Student's t test were used for the statistical analysis.Results:Significant tracing widening and shortening was observed in the advancement surgery and setback surgery groups compared to the control group. Especially the postoperative data of mandibular advancement cases showed reduced mobility and more discrepancy in width compared to the control group and mandibular setback group.Conclusion:Patients, who have undergone advancement surgery, have to be analyzed carefully since these patients are more prone to develop TMDS. None of the patients among mandibular advancement surgery group in our study needed help for their current status. This study shows that after orthognathic surgery, lower jaw movements are more limited and less reproducible, and these results are even more severe in mandibular advancement surgery cases

Does the Bone Cement Affect Miniscrew Stability?

Objective:The purpose of this study was to determine whether bone cement increased the resistance of miniscrews against pull-out and shear forces.Materials and Method:Sixty commercially available miniscrews were placed into bovine bone samples (one each) at a 90° angle, using a custom-made orientation jig and controlling torque (30 N-cm) and rotation (20 rpm) with a rechargeable screwdriver. The miniscrews were inserted using three different methods: self-drilling, predrilling, and predrilling with bone cement application. Pull-out strengths and shear tests were performed using a universal testing machine.Results:Nonparametric Kruskal-Wallis tests were used for comparisons between groups, and Bonferroni-adjusted Mann-Whitney U tests were used to detect different group(s) (α/3=0.016). There was a statistically significant difference between the pull-out strengths of the groups (p<0.01). The self-drilling group had a significantly lower pull-out strength at failure than the other groups (p<0.016). The pullout strengths of the miniscrews placed with bone cement had a significantly higher pull-out strength than the predrilling group. In shear tests, there was no statistically significant difference among the groups.Conclusion:This study is the first report demonstrating the effects of bone cement on stability and resistance to failure at the bone-miniscrew interface. These results show that the use of miniscrews with bone cement is a promising method that may extend the limits of force application

3 dimensional evaluation of maxillary sinuses after rapid maxillary expansion and following one year retention period

The purpose of this study was to evaluate volumetric differences of the maxillary sinus on computed tomography data taken before RME, after 3 months of retention and 1 year following retention. Twenty one consequtive patients (11 girls, 10 boys ) who required RME with cap splint Hyrax appliances as part of their orthodontic treatment were studied. Volumetric measurements before (T1), after retention period (T2) and one year following the retention period (T3) of RME were performed using a 3D tomography prototyping software (Mimics v.14.0, Materialise, Belgium). Maxillary sinus regions were isolated in every slice and then the 3D images were constituted. Sinus volumes were measured. The acquired data were compared for three periods by using repeated measures ANOVA and post-hoc comparisons were made by paired samples t-test. In the volumetric evaluation of maxillary sinuses in RME patients, sinus volume increase was statistically significant in all three times (P<0.001)