scholarly journals Sagittal Relationship between the Maxillary Central Incisors and the Forehead in Digital Twins of Korean Adult Females

2021 ◽  
Vol 11 (3) ◽  
pp. 203
Author(s):  
Seoung-Won Cho ◽  
Soo-Hwan Byun ◽  
Sangmin Yi ◽  
Won-Seok Jang ◽  
Jong-Cheol Kim ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Three Dimensional ◽  
Careful Consideration ◽  
Control Group ◽  
3D Analysis ◽  
Central Incisor ◽  
Maxillary Central Incisor ◽  
Digital Twins ◽  
Before And After ◽  
Korean Adult

Objective: Digital twins of adult Korean females were created as a tool to evaluate and compare the sagittal relationship between the maxillary central incisors and the forehead before and after orthodontic treatment. Methods: Digital twins were reconstructed for a total of 50 adult female patients using facial scans and cone-beam computed tomography (CBCT) images. The anteroposterior position of the maxillary central incisor and the forehead inclination were measured. Results: The control group presented a mean of 6.7 mm for the sagittal position and 17.5° for forehead inclination. The study group showed a mean of 9.3 mm for the sagittal position and 13.6° for forehead inclination. Most Korean females seeking orthodontic treatment had their maxillary central incisor anterior to the glabella. In contrast, fewer Korean females who completed their orthodontic treatments had their maxillary central incisor anterior to the glabella. Furthermore, patients who had completed the orthodontic treatment were more likely to have the maxillary central incisor between the forehead facial axis and glabella. Conclusion: The use of digital twins for three-dimensional (3D) analysis of the profile implies a high clinical significance. In addition, as the facial profile of Koreans is different from that of Caucasians, careful consideration should be made when setting treatment goals for the anteroposterior position of the maxillary central incisors.

Outcome of orthodontic treatment in subjects with periodontal disease. Part III: a CBCT study of external apical root resorption

2019 ◽  
Vol 41 (6) ◽  
pp. 575-582 ◽  
Author(s):  
Eglė Zasčiurinskienė ◽  
Henrik Lund ◽  
Rune Lindsten ◽  
Henrik Jansson ◽  
Krister Bjerklin
Keyword(s):  
Periodontal Disease ◽  
Inclination Angle ◽  
Orthodontic Treatment ◽  
Root Resorption ◽  
Control Group ◽  
Central Incisor ◽  
Maxillary Central Incisor ◽  
Apical Root Resorption ◽  
External Apical Root Resorption ◽  
Maxillary Incisors

Summary Background No evidence is present on the risk for external apical root resorption (EARR) during orthodontic treatment (OT) of adult patients with periodontal disease. Aim To examine EARR after OT in subjects with periodontal disease and to analyse how intrusion and change in inclination of the most proclined maxillary incisors influence EARR. Methods The study included 50 patients with periodontal disease. Sub-gingival debridement by ultrasonic instrumentation supplemented with hand instruments was performed by experienced dental hygienist after baseline examination for all patients. For the control group, final periodontal treatment (PT) was performed before orthodontic tooth movement. For the test group patients, final PT was performed after levelling and alignment phases were finished, before the active space closure with elastic chain and/or inter-arch elastic traction for sagittal correction was started. OT was performed with a straight-wire appliance. Micro-implants or implants were used for posterior anchorage. Cone beam computed tomography examinations were performed before and after OT. EARR of all single-rooted teeth were measured. EARR of the most proclined maxillary incisor was related to intrusion and change in inclination angle. Results EARR after OT was observed in median 80.7 per cent (interquartile range 22.02) of single-rooted teeth [mean 1.2 (standard deviation 0.44) mm]. In 82.3 per cent of teeth, EARR was 2 mm or less. Severe EARR was found in 8 per cent of patients and five maxillary incisors (less than 1 per cent of all teeth). The amount of intrusion and change in inclination angle of the most proclined maxillary central incisor influenced the extent of EARR. Mean EARR was significantly higher when OT lasted more than 18 months (P = 0.02). Conclusions OT in conjunction with PT in periodontal patients resulted in EARR in 81 per cent of all single-rooted teeth. Intrusion and change in inclination angle of the most proclined maxillary central incisor influenced the extent of EARR, as did longer OT.

The response of pygmy bluetongue lizards to simulated grazing in the field during three drought years

2012 ◽  
Vol 39 (6) ◽  
pp. 540 ◽  
Author(s):  
Melissa Pettigrew ◽  
C. Michael Bull
Keyword(s):  
Prey Availability ◽  
Careful Consideration ◽  
Grazing Management ◽  
Control Treatment ◽  
Ground Vegetation ◽  
Control Group ◽  
Drought Period ◽  
Before And After ◽  
Simulated Grazing ◽  
Complex Relationships

Context Grazing by domestic stock can directly influence and shape the functions of an ecosystem. Most remaining remnant native grasslands in Australia are under some form of grazing management, with some possible adverse impacts for endemic grassland biota. For the endangered pygmy bluetongue lizard (Tiliqua adelaidensis), grazing of its remnant native grassland habitat has been seen as a potential conservation threat. Aim We aimed to investigate whether lizards altered their basking and foraging behaviour as a response to simulated grazing of the grassland habitat surrounding their burrows. Methods We used field manipulations over 3 years event by manually removing above-ground vegetation in 1 m2 around occupied lizard burrows, to simulate intense grazing events. We video-recorded lizard responses to these manipulations. We filmed lizards before and after the simulated grazing event and monitored basking and foraging response. We also simultaneously filmed a control group of lizards that were not exposed to a simulated grazing event. Key results Although overall time spent basking did not differ between treatment and control groups, the lizards spent more of their basking time completely emerged (bold basking) in the grazing treatment, suggesting they changed behaviour after simulated grazing. Perhaps they were more confident of evading predators that they could more clearly see approaching. In one season lizards made more attempts to catch prey in the grazed treatment than in a control treatment following the treatment, suggesting that grazing might enhance visibility for the ambush predation method that these lizards use. Conclusions The results suggest that grazing may produce some benefits for lizards already established in burrows. This contrasts with some previous results and suggests that management of grazing regimes requires careful consideration of the conditions currently prevalent. In this case, the study was conducted during a drought period, and different results might have emerged in higher rainfall years. Implications Grazing management for lizard conservation requires detailed understanding of the complex relationships among lizard behaviour, vegetation cover and invertebrate prey availability.

Management of root dilaceration of an impacted maxillary central incisor following orthodontic treatment: an unusual therapeutic outcome

2010 ◽  
Vol 26 (6) ◽  
pp. 521-526 ◽  
Author(s):  
Nikolaos Topouzelis ◽  
Phoebus Tsaousoglou ◽  
Anastasia Gofa
Keyword(s):  
Orthodontic Treatment ◽  
Therapeutic Outcome ◽  
Central Incisor ◽  
Maxillary Central Incisor

scholarly journals ORTHODONTIC TREATMENT OF ECTOPIC MAXILLARY CENTRAL INCISOR IN A CEREBRAL PALSY PATIENT

2015 ◽  
Vol 11 (2) ◽  
pp. 72-75
Author(s):  
Seok Hun Jang ◽  
Ok Hyung Nam ◽  
Hyo-Seol Lee ◽  
Kwang Chul Kim ◽  
Sung Chul Choi
Keyword(s):  
Cerebral Palsy ◽  
Orthodontic Treatment ◽  
Central Incisor ◽  
Maxillary Central Incisor ◽  
Cerebral Palsy Patient

scholarly journals Geometric analysis of alveolar bone around the incisors after anterior retraction following premolar extraction

2019 ◽  
Vol 90 (2) ◽  
pp. 173-180 ◽  
Author(s):  
Fan Zhang ◽  
Suk-Cheol Lee ◽  
Jun-Beom Lee ◽  
Kyung-Min Lee
Keyword(s):  
Orthodontic Treatment ◽  
Alveolar Bone ◽  
Shape Change ◽  
Geometric Analysis ◽  
Careful Consideration ◽  
Mandibular Incisor ◽  
Premolar Extraction ◽  
Significant Difference ◽  
Before And After ◽  
Mandibular Incisors

ABSTRACT Objective: To evaluate changes in shape and alterations in thickness and vertical marginal bone levels of the alveolar bone around the maxillary and mandibular incisors before and after orthodontic treatment with premolar extraction using geometric morphometric analysis. Materials and Methods: Thirty-six patients with Class I bialveolar protrusion who underwent orthodontic treatment with premolar extraction were included. Cone-beam computed tomographic scans were obtained from the patients before and after treatment. Five fixed landmarks and 70 semilandmarks were used to represent the morphology of the alveolar bone around the maxillary and mandibular incisors. The coordinates of the landmarks of the alveolar bones were generated by Procrustes fit. The labial and lingual alveolar bone thicknesses around the maxillary and mandibular incisors and vertical marginal bone level were assessed quantitatively. Results: There was a significant difference in shape change of the alveolar bone before and after treatment. The deformation grid of the thin plate spline showed that the thickness and vertical marginal bone decreased on the lingual side after treatment. Shape changes were greater for the lingual alveolar bone on the mandibular incisor than for the maxillary incisors. Conclusions: Orthodontic treatment with premolar extraction might cause loss of alveolar bone around the maxillary and mandibular incisors. Careful consideration is needed to avoid iatrogenic degeneration of periodontal support around the incisors, particularly in the lingual area.

Endodontic Management of Canal Calcification in Maxillary Central Incisor Using 3D Prototyping Technique: A Case Report

2020 ◽  
Vol 11 (1) ◽  
pp. 93-96
Author(s):  
Suryasowjanya Doranala ◽  
Harikumar Vemisetty ◽  
Rajani Punna ◽  
Aditya Mohan Alwala
Keyword(s):  
Case Report ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Conventional Technique ◽  
Cone Beam ◽  
Central Incisor ◽  
Cavity Preparation ◽  
Present Case Report ◽  
Maxillary Central Incisor ◽  
Tooth Structure

Teeth with calcific metamorphosis pose a challenge to the endodontist in achieving proper access, identification, and debridement of the root canal. With the conventional technique, radiographs and bur orientation have dictated the access cavity preparation, which leads to the removal of more sound tooth structure and iatrogenic errors. To overcome these issues, the recent diagnostic imaging techniques such as cone beam computed tomography followed by three-dimensional fabrication of template have been proposed, which aid the clinician to accurately locate and negotiate the obliterated canal. The present case report describes the importance of conservative access cavity preparation with the use of the guided endodontic technique for the treatment of calcified canals in the maxillary central incisor.

Effects of labial and lingual retraction and intrusion force on maxillary central incisor with varying collum angles: A three-dimensional finite elemental analysis

2017 ◽  
Vol 51 (1) ◽  
pp. 28-37
Author(s):  
Sandesh S Pai ◽  
Suchareeta Panda ◽  
Vinaya Pai ◽  
M Anandu ◽  
E Vishwanath ◽  
...  
Keyword(s):  
Elemental Analysis ◽  
Three Dimensional ◽  
Central Incisor ◽  
Maxillary Central Incisor
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