scholarly journals Effect of continuous versus intermittent orthodontic forces on root resorption: A microcomputed tomography study

2018 ◽  
Vol 88 (6) ◽  
pp. 733-739 ◽  
Author(s):  
Nurhat Ozkalayci ◽  
Ersan Ilsay Karadeniz ◽  
Selma Elekdag-Turk ◽  
Tamer Turk ◽  
Lam L. Cheng ◽  
...  
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Experimental Period ◽  
Microcomputed Tomography ◽  
Orthodontic Force ◽  
Rotational Movement ◽  
Force Application ◽  
Orthodontic Forces ◽  
Intermittent Regimen

ABSTRACT Objectives: To compare the extent of root resorption and the amount of tooth movement between continuous orthodontic force and intermittent orthodontic force that was activated in a similar way to a 4-week orthodontic adjustment period. Materials and Methods: Twenty-five patients who required the extraction of upper first premolars were recruited in this study. A buccally directed continuous force of 150 g was applied to the upper first premolar on one side for 15 weeks. A buccally directed intermittent force (28 days on, 7 days off) of the same magnitude was applied to the contralateral first premolar. The teeth were extracted at the end of the experimental period and processed for volumetric evaluations of resorption craters. The degree of tooth movement and rotation were measured on the study models. Results: Continuous force application displayed significantly higher root resorption volume than the intermittent force application (P < .05), particularly on the buccal and lingual surfaces (P < .05) and the middle third of the root (P < .01). There was more tipping and rotational movement in the continuous force group. Conclusions: In a 4-week orthodontic adjustment period, intermittent force significantly reduced the amount of root resorption compared with continuous force. Although there was less degree of tooth movement with intermittent force, unwanted rotational movement was avoided. This is crucial in patients who are predisposed to orthodontically induced inflammatory root resorption, and the use of this intermittent regimen should be considered.

Effects of diabetes on tooth movement and root resorption after orthodontic force application in rats

2016 ◽  
Vol 19 (2) ◽  
pp. 83-92 ◽  
Author(s):  
K. Arita ◽  
H. Hotokezaka ◽  
M. Hashimoto ◽  
T. Nakano-Tajima ◽  
T. Kurohama ◽  
...  
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Orthodontic Force ◽  
Force Application

scholarly journals Tooth movement and root resorption; The effect of ovariectomy on orthodontic force application in rats

2011 ◽  
Vol 81 (4) ◽  
pp. 570-577 ◽  
Author(s):  
Irin Sirisoontorn ◽  
Hitoshi Hotokezaka ◽  
Megumi Hashimoto ◽  
Carmen Gonzales ◽  
Suwannee Luppanapornlarp ◽  
...  
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Orthodontic Force ◽  
Force Application

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.

FINITE ELEMENT ANALYSIS OF ROOT RESORPTION ASSOCIATED WITH TOOTH MOVEMENT: A SYSTEMATIC REVIEW”

2021 ◽  
pp. 53-59
Author(s):  
Ajit Vikram Parihar ◽  
Shishupal Meena
Keyword(s):  
Systematic Review ◽  
Tooth Movement ◽  
Root Resorption ◽  
Cochrane Collaboration ◽  
Risk Of Bias ◽  
Cochrane Central Register ◽  
3D Fem ◽  
Element Analysis ◽  
Orthodontic Force ◽  
Nite Element

Background: The purpose of this systematic review was to examine the available evidence of root resorption during orthodontic treatment with different force systems using nite element analysis. Methods: The following electronic databases were searched for literature till June 2021 : Pro-Quest Dissertation Abstracts and Thesis database, Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Google Scholar, Embase, US National Library of Medicine, and National Research Register. Root resorption studied under orthodontic forces, which simulated under various technique of nite element method (3D FEM) models were included in the study. The selected studies were assessed for the risk of bias using the Cochrane Collaboration risk of bias tool. The “trafc plot” and “weighted plot” risk of bias distribution were designed using the ROBVIS tool. The authors extracted and analyzed the data. Results: Fourteen studies fullled the inclusion criteria. The risks of biases were high for all studies.Data on quantity and direction of force applied, different type of root morphology and its various surface inuence on root resorption were extracted. The outcomes of the included studies were heterogeneous. Conclusion: Based on the current available literature, for reducing root resorption the excessive force may accelerate root resorption when it exceeds the typical human capillary blood pressure. Root resorption occurs more when extrusion/intrusion and tipping occur than when teeth actually move. A tooth with little or no orthodontic force load hardly shows any root resorption compared to one that has orthodontic force.

scholarly journals Effect of fluoride on root resorption following heavy and light orthodontic force application for 4 weeks and 12 weeks of retention

2012 ◽  
Vol 83 (3) ◽  
pp. 418-424 ◽  
Author(s):  
Ersan I. Karadeniz ◽  
Carmen Gonzales ◽  
Tamer Turk ◽  
Devrim Isci ◽  
Aynur M. Sahin-Saglam ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Root Resorption ◽  
Positive Control ◽  
Orthodontic Force ◽  
Control Side ◽  
Force Application ◽  
Fluoride Intake ◽  
High Fluoride ◽  
Experimental Side ◽  
Light Force

ABSTRACT Objective: To evaluate the null hypothesis that fluoride intake via drinking water has no effect on orthodontic root resorption in humans after orthodontic force application for 4 weeks and 12 weeks of retention. Materials and Methods: Forty-eight patients who required maxillary premolar extractions as part of their orthodontic treatment were selected from two cities in Turkey. These cities had a high and low fluoride concentration in public water of ≥2 pm and ≤0.05 pm, respectively. The patients were randomly separated into four groups of 12 each: group 1HH, high fluoride (≥2 ppm) and heavy force (225 g); group 2LH, low fluoride (≤0.05 ppm) and heavy force; group 3HL, high fluoride and light force (25 g); and group 4LL, low fluoride and light force. Light or heavy buccal tipping force was applied on the upper first premolars for 28 days. At day 28, the left premolars were extracted (positive control side); the right premolars (experimental side) were extracted after 12 weeks of retention. The samples were analyzed with microcomputed tomography. Results: On the positive control side, under heavy force application, the high fluoride groups exhibited less root resorption (P  =  .015). On the experimental side, it was found that fluoride reduced the total volume of root resorption craters; however, this effect was not statistically significant (P  =  .237). Moreover, the results revealed that under heavy force application experimental teeth exhibited more root resorption than positive control groups. Conclusion: The null hypothesis could not be rejected. High fluoride intake from public water did not have a beneficial effect on the severity of root resorption after a 4-week orthodontic force application and 12 weeks of passive retention.

Effect of piezocision on root resorption associated with orthodontic force: A microcomputed tomography study

2017 ◽  
Vol 151 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Braydon M. Patterson ◽  
Oyku Dalci ◽  
Alexandra K. Papadopoulou ◽  
Suman Madukuri ◽  
Jonathan Mahon ◽  
...  
Keyword(s):  
Root Resorption ◽  
Microcomputed Tomography ◽  
Orthodontic Force
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