scholarly journals Orthodontic treatment in impacted maxillary canines. A review of the literature

2021 ◽  
Vol 9 (4) ◽  
pp. e085
Author(s):  
Alexandra J. Aquino-Valverde ◽  
Datfne Milagros Barrientos-Sánchez ◽  
Katherine Joselyn Atoche-Socola
Keyword(s):  
Orthodontic Treatment ◽  
Root Resorption ◽  
Cost Benefit ◽  
Review Of The Literature ◽  
Canine Tooth ◽  
Correct Position ◽  
Adequate Treatment ◽  
Impacted Canines ◽  
Selection Of ◽  
Treatment Surgery

The prevalence of impacted maxillary canines is 1 to 3%, with approximately 50% of impacted canines causing root resorption of adjacent teeth. If the permanent canine has not acquired its correct position, evaluation by an orthodontist is necessary to determine the most adequate treatment. Surgery and orthodontic treatment are used for the treatment of impacted canines in the maxilla affecting permanent dentition. Selection of the most adequate treatment to achieve the correct position of the canine tooth depends on the position of the canine. This article summarizes the different techniques available and describes their advantages, and cost-benefit considerations. The objective of this literature review is to describe the etiology of impacted maxillary canines and provide an update of the information on orthodontic treatments available for these patients.

Effects of root–cortex relationship, root shape, and impaction side on treatment duration and root resorption of impacted canines

2021 ◽  
Author(s):  
Mehmet Amuk ◽  
Nisa Gul Amuk ◽  
Taner Ozturk
Keyword(s):  
Risk Factors ◽  
Treatment Duration ◽  
Orthodontic Treatment ◽  
Root Resorption ◽  
Positive Root ◽  
Alpha Angle ◽  
Root Cortex ◽  
Impacted Canines ◽  
Computed Tomography Images ◽  
Categorical Groups

Summary Objectives This retrospective longitudinal study aimed to evaluate the factors that affect the orthodontic treatment duration (OTD) and external apical root resorption (EARR) of maxillary impacted canines (MIC) as root–cortex relationship, root shape, impaction side, and gender. Material and method Thirty-eight patients (mean age 15.28 ± 1.48 years) who had unilateral MIC and undergone orthodontic treatment were included in this study. Root–cortex relationship, root–cortex intersection amount, root shape, impaction side, height, alpha angle, impaction zone, and length of the MIC were evaluated on cone-beam computed tomography images at the beginning of the treatment. Final assessments were performed on ortopantograms at the end of the treatment as canine angulation and tooth length. The sample was characterized by descriptive statistics; t-tests, Mann–Whitney U-test, ANOVA, and Kruskal–Wallis tests were used for the comparison of EARR and OTD values between the categorical groups. Results Root shape affected OTD, and the longest value was detected in MIC with bent root (P < 0.000). The presence of root–cortex relationship also prolonged OTD for approximately 3 months (P = 0.006). MIC with risk factors like positive root–cortex relationship and bent roots had higher EARR values than those with negative root–cortex relationship and normal roots (P = 0.042, P = 0.021, respectively). EARR of the palatal MIC was also higher than the buccal MIC (P = 0.009). OTD was significantly influenced by root–cortex intersection amount (P = 0.004). Conclusion The presence of root–cortex relationship and abnormal root shape were risk factors for greater EARR of MIC along OTD, which was also significantly influenced by root shape and root–cortex relationship.

scholarly journals Monotonic Functions Method and Its Application to Staging of Patients with Prostate Cancer According to Pretreatment Data

2021 ◽  
Vol 11 (9) ◽  
pp. 3836
Author(s):  
Valeri Gitis ◽  
Alexander Derendyaev ◽  
Konstantin Petrov ◽  
Eugene Yurkov ◽  
Sergey Pirogov ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Learning Algorithm ◽  
Binary Classification ◽  
Preoperative Staging ◽  
Threshold Value ◽  
Logical Function ◽  
Adequate Treatment ◽  
Monotonic Functions ◽  
Selection Of

Prostate cancer is the second most frequent malignancy (after lung cancer). Preoperative staging of PCa is the basis for the selection of adequate treatment tactics. In particular, an urgent problem is the classification of indolent and aggressive forms of PCa in patients with the initial stages of the tumor process. To solve this problem, we propose to use a new binary classification machine-learning method. The proposed method of monotonic functions uses a model in which the disease’s form is determined by the severity of the patient’s condition. It is assumed that the patient’s condition is the easier, the less the deviation of the indicators from the normal values inherent in healthy people. This assumption means that the severity (form) of the disease can be represented by monotonic functions from the values of the deviation of the patient’s indicators beyond the normal range. The method is used to solve the problem of classifying patients with indolent and aggressive forms of prostate cancer according to pretreatment data. The learning algorithm is nonparametric. At the same time, it allows an explanation of the classification results in the form of a logical function. To do this, you should indicate to the algorithm either the threshold value of the probability of successful classification of patients with an indolent form of PCa, or the threshold value of the probability of misclassification of patients with an aggressive form of PCa disease. The examples of logical rules given in the article show that they are quite simple and can be easily interpreted in terms of preoperative indicators of the form of the disease.

scholarly journals Is Inflammation a Friend or Foe for Orthodontic Treatment?: Inflammation in Orthodontically Induced Inflammatory Root Resorption and Accelerating Tooth Movement

2021 ◽  
Vol 22 (5) ◽  
pp. 2388
Author(s):  
Masaru Yamaguchi ◽  
Shinichi Fukasawa
Keyword(s):  
Inflammatory Mediators ◽  
Orthodontic Treatment ◽  
Alveolar Bone ◽  
Tooth Movement ◽  
Root Resorption ◽  
Orthodontic Tooth Movement ◽  
Tnf Α ◽  
Orthodontic Forces ◽  
Necrosis Factor

The aim of this paper is to provide a review on the role of inflammation in orthodontically induced inflammatory root resorption (OIIRR) and accelerating orthodontic tooth movement (AOTM) in orthodontic treatment. Orthodontic tooth movement (OTM) is stimulated by remodeling of the periodontal ligament (PDL) and alveolar bone. These remodeling activities and tooth displacement are involved in the occurrence of an inflammatory process in the periodontium, in response to orthodontic forces. Inflammatory mediators such as prostaglandins (PGs), interleukins (Ils; IL-1, -6, -17), the tumor necrosis factor (TNF)-α superfamily, and receptor activator of nuclear factor (RANK)/RANK ligand (RANKL)/osteoprotegerin (OPG) are increased in the PDL during OTM. OIIRR is one of the accidental symptoms, and inflammatory mediators have been detected in resorbed roots, PDL, and alveolar bone exposed to heavy orthodontic force. Therefore, these inflammatory mediators are involved with the occurrence of OIIRR during orthodontic tooth movement. On the contrary, regional accelerating phenomenon (RAP) occurs after fractures and surgery such as osteotomies or bone grafting, and bone healing is accelerated by increasing osteoclasts and osteoblasts. Recently, tooth movement after surgical procedures such as corticotomy, corticision, piezocision, and micro-osteoperforation might be accelerated by RAP, which increases the bone metabolism. Therefore, inflammation may be involved in accelerated OTM (AOTM). The knowledge of inflammation during orthodontic treatment could be used in preventing OIIRR and AOTM.

Klimaatverandering als journalistieke uitdaging: een literatuurstudie

2012 ◽  
Vol 40 (3) ◽  
Author(s):  
Richard van der Wurff
Keyword(s):  
Climate Change ◽  
The Political ◽  
Industrialized Countries ◽  
Review Of The Literature ◽  
News Values ◽  
Political Actors ◽  
Political Challenge ◽  
Media Logic ◽  
Political Framing ◽  
Selection Of

Climate change as a challenge for journalism: a review of the literature Climate change as a challenge for journalism: a review of the literature This literature review synthesizes 35 years of research on climate change reporting in industrialized countries. It focuses on the production and content of climate change news. Starting from the notion of the mediatisation of politics, the study shows that news values and media logic shape the selection of climate change related newsworthy events, while political actors and their logics determine the political framing of the issue. Next, implications for public opinion and mediated public debate are briefly assessed. Overall, the findings suggest that reporting focuses on threats and conflicts, favours national rather than transnational angles, reinforces ideological cleavages, downplays deliberative arguments, and disengages citizens. In conclusion, four lines of research are proposed that can help us better understand the role media might play in engaging citizens in a more deliberative mediated debate on climate change as important ecological and political challenge.

Sign in / Sign up

Export Citation Format

Share Document