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Objective The aim was to investigate the effect of mechanical vibration on root resorption with or without orthodontic force application. Material and methods Twenty patients who required maxillary premolar extractions as part of orthodontic treatment were randomly divided into two groups of 10: no-force group and force group. Using a split-mouth procedure, each patient’s maxillary first premolar teeth were randomly assigned as either vibration or control side for both groups. A buccally directed vibration of 50 Hz, with an Oral-B HummingBird device, was applied to the maxillary first premolar for 10 min/day for 12 weeks. After the force application period, the maxillary first premolars were extracted and scanned with micro-computed tomography. Fiji (ImageJ), performing slice-by-slice quantitative volumetric measurements, was used for resorption crater calculation. Total crater volumes were compared with the Wilcoxon and Mann–Whitney U tests. Results The total crater volumes in the force and no-force groups were 0.476 mm3 and 0.017 mm3 on the vibration side and 0.462 mm3 and 0.031 mm3 on the control side, respectively. There was no statistical difference between the vibration and control sides (P > 0.05). There was more resorption by volume in the force group when compared to the no-force group (P < 0.05). Conclusion Mechanical vibration did not have a beneficial effect on reducing root resorption; however, force application caused significant root resorption.

Objective The spatial position of a canine can affect the level of proximal root resorption and the success of orthodontic treatment. The aim of this study was to examine the mesiodistal and vertical position of impacted maxillary canines and to assess their relationship with the lateral incisor by using cone beam computed tomography (CBCT). Material and method One hundred and sixty-nine CBCT scans of patients presenting with maxillary impacted canines were included in the study. The buccopalatal, mesiodistal (classified as sectors I, II, III, IV from distal to mesial) and vertical (cervical, middle, apical) position of the maxillary impacted canines were determined. The positional effect on the morphology (width, length, and depth) and resorption was assessed on the roots of the maxillary lateral incisors. Obtained data were statistically analysed by using Student t-test, the Mann Whitney U and Chi-Square tests. Results Of the maxillary impacted canines, the 34.72% that had associated resorption on the adjacent lateral incisors were buccally positioned, and 65.28% were palatally positioned. While 45.58% of sector I impacted maxillary canines were buccally positioned, 68.31% of sector IV impacted maxillary canines were palatally positioned. Furthermore, there was a statistical significance between the mesiodistal position and palatal or buccal maxillary canine impaction (p < 0.05). In addition, the vertical position of the impacted maxillary canines was also related to their mesiodistal and buccopalatal positions (p < 0.05). Conclusion While all maxillary impacted canines had the potential to cause lateral incisor resorption, there was no close relationship related to the canine’s buccopalatal, mesiodistal and vertical position. Nevertheless, if an impacted maxillary canine migrated towards the midline, the buccopalatal and vertical position of the tooth changed from buccal to palatal and cervical to apical, respectively.

Karadeniz, Carmen/0000-0003-2371-9037; Karadeniz, Carmen B/0000-0003-2371-9037 WOS: 000504768300005 PubMed: 32110466 Objective: The aim of this study was to compare the accuracy of digital and plaster model methods and the time required for analysis. Methods: A total of 30 subjects (20 females, 10 males; mean age, 14.36 +/- 6.30 years), who required plaster models for the construction of either a fixed or a removable orthodontic appliance, were randomly selected. As part of the diagnostic records, digital impressions with a three-dimensional (3D) intra-oral scanner (TriosColor-P13 Shape) were taken from all subjects. Conventional impressions for the orthodontic appliances were taken with alginate (Orthoprint, Zhermack, Italy), and the plaster models were obtained (Scheu-Dental, GmbH.D-58642, Iserlohn, Germany). Two groups were formed. In the conventional measurement group, manual measurements were taken on the plaster models, while in the digital measurement group, the 3Shape OrthoAnalyzer 2013 software was used to make the measurements on the 3D models. In both groups, the total time required to perform the Bolton analysis and space analysis was recorded, and the results were compared. Results: There was no statistically significant difference found between the two groups in terms of the measurement values. The total time to perform all the analyses was determined to be shorter with digital models compared to conventional plaster models (p

Objectives: This study aimed to compare the diagnostic accuracy of cone beam CT (CBCT) units with different voxel sizes with the digital intraoral scanning technique in terms of the detection of periodontal defects. Methods and materials: The study material comprised of 12 dry skulls with maxilla and mandible. Artificial defects were created on teeth separately using burs randomly on dry skulls. In total 46 dehiscences, 10 fenestrations, 17 furcations, 12 wall defects and 13 without periodontal defect were used in the study. Each tooth with and without defects was imaged at various vertical angles using each of the following modalities: a Veraviewepocs 3D R100 CBCT device and a 3D Shape TRIOSㄾ Color P13 Shade Intraoral Scanner. Results: The κ values for interobserver agreement between observers ranged between 0.29 and 0.86 for the CBCT 10 × 8 cm field of view (FOV) with 0,160 mm3 voxel size; 0.35 and 1 for the CBCT 8 × 8 cm FOV with 0,125 mm3 voxel size; and 0.30 and 1 of intraoral scans. The κ values for detecting defects on anterior teeth were the least, following premolar and molar teeth both CBCT and intraoral scanning. Conclusions: Smaller voxel sizes and smaller CBCT FOV has the highest sensitivity and diagnostic accuracy for detecting various periodontal defects among the scanner modalities examined. Advances in knowledge: Adequate evaluation of the condition of the alveolar bone and periodontal tissues is important for the diagnosis, treatment, and prognosis of periodontal disease. Limited examination methods, such as palpation, inspection, and periodontal probe examination, may provide insufficient information for the diagnosis of periodontal diseases.

The objective of this study was to evaluate the effectiveness of two different techniques for the eruption of impacted central incisors. Two male patients first 11 years old; second 23 years old were treated with fixed orthodontic mechanics to erupt the patient’s central incisors. After leveling and aligning stage, cleat attachments surgically placed over the impacted teeth in two cases. Case 1; after 1 week, Kilroy I spring placed on the upper left central incisor teeth and it was activated. At the end of the 3rd month, teeth were observed in the mouth. After removal of Kilroy I spring, fixed orthodontic treatment was continued. Fixed attachments were removed at the end of treatment which was 16 months. Case 2; was taught taking 1/8 medium elastics from impacted centrals to lower arch. At the end of the 6th month, teeth were observed in the mouth and fixed orthodontic treatment was continued. Fixed orthodontic attachments were removed at the end of the treatment period of 22 months. Eruption of the upper incisors was reached successfully with both techniques using multidiciplinary approach, Bu olgu sunumunda gömülü santral keserlerin sürdürülmesinde iki farklı tekniğin etkinliğinin değerlendirilmiştir. On-bir ve 23 yıl kronolojik yaştaki iki erkek hastanın santral keser dişlerini sürdürmek için sabit ortodontik ataşmanlar uygulandı. Her iki olguda da seviyeleme ve sıralama aşamalarından sonra gömülü dişlerin üzeri cerrahi olarak açılarak cleat ataşmanlar yerleştirildi. Olgu 1; 1 hafta sonra 11 yaşındaki hastanın üst sol santral kesici dişine Kilroy I spring yerleştirilerek aktive edildi, 3. ayın sonunda diş ağızda gözlendi ve diş tamamen sürdükten sonra Kilroy I spring çıkartılarak sabit ortodontik mekaniklerle tedaviye devam edildi. On-altı ay süren tedavinin ardından sabit ataşmanlar çıkartıldı. Olgu 2; 23 yaşındaki hastanın her iki gömülü santralinden alt arkına 1/8 medium lastik kullanımı öğretildi. Altı ay sonunda diş ağızda gözlendi ve tamamen sürdükten sonra sabit ortodontik mekanikler ile tedaviye devam edildi. Yirmiiki ay süren tedavinin ardından sabit ortodontik ataşmanlar çıkartıldı. Bu iki olgu ile gömülü üst keser dişlerin sürdürülmesinde kullanılan her iki tekniğin de multidisipliner yaklaşım ile başarılı olduğu vurgulanmak istenmiştir