scholarly journals Alveolar bone response to maxillary incisor retraction using stable skeletal structures as a reference

2020 ◽  
Vol 91 (1) ◽  
pp. 30-35
Author(s):  
Teerapat Eksriwong ◽  
Udom Thongudomporn
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Rank Test ◽  
Maxillary Incisor ◽  
Bone Change ◽  
Position Change ◽  
Significance Level ◽  
Skeletal Structures ◽  
Bone Response ◽  
Incisor Retraction

ABSTRACT Objectives To evaluate alveolar bone change in relation to root position change after maxillary incisor retraction via cone-beam computed tomography (CBCT) using stable skeletal structures as a reference. Materials and Methods A total of 17 subjects (age 24.7 ± 4.4 years) who required retraction of the maxillary incisors were included. Labial and palatal alveolar bone changes and root change were assessed from preretraction and 3 months postretraction CBCT images. The reference planes were based on stable skeletal structures. The Kruskal-Wallis test and Wilcoxon signed-rank test were used to compare changes within and between groups, as appropriate. Spearman rank correlations were used to identify the parameters that correlated with alveolar bone change. The significance level was set at .05. Results The labial alveolar bone change after maxillary incisor retraction was statistically significant (P < .05), and the bone remodeling/tooth movement (B/T) ratio was 1:1. However, the palatal bone remained unchanged (P > .05). The change in inclination was significantly related to labial alveolar bone change. Conclusions Using stable skeletal structures as a reference, the change in labial alveolar bone followed tooth movement in an almost 1:1 B/T ratio. Palatal alveolar bone did not remodel following maxillary incisor retraction. The change in inclination was associated with alveolar bone change.

scholarly journals Effects of different force magnitudes on corticotomy-assisted orthodontic tooth movement in rats

2018 ◽  
Vol 88 (5) ◽  
pp. 632-637 ◽  
Author(s):  
Kriangkrai Kraiwattanapong ◽  
Bancha Samruajbenjakun
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Root Resorption ◽  
Volume Fraction ◽  
Micro Ct ◽  
Histomorphometric Analysis ◽  
Bone Volume Fraction ◽  
Bone Response ◽  
Significant Difference ◽  
Light Force

ABSTRACT Objectives: To investigate the effects of light and heavy forces with corticotomy on tooth movement rate, alveolar bone response, and root resorption in a rat model. Materials and Methods: The right and left sides of 40 male Wistar rats were randomly assigned using the split-mouth design to two groups: light force with corticotomy (LF) and heavy force with corticotomy (HF). Tooth movement was performed on the maxillary first molars using a nickel-titanium closed-coil spring delivering either 10 g (light force) or 50 g (heavy force). Tooth movement and alveolar bone response were assessed by micro–computed tomography (micro-CT) at day 0 as the baseline and on days 7, 14, 21, and 28. Root resorption was examined by histomorphometric analysis at day 28. Results: Micro-CT analysis showed a significantly greater tooth movement in the HF group at days 7 and 14 but no difference in bone volume fraction at any of the observed periods. Histomorphometric analysis found no significant difference in root resorption between the LF and HF groups at day 28. Conclusions: Heavy force with corticotomy increased tooth movement at days 7 and 14 but did not show any difference in alveolar bone change or root resorption.

Optimization Spring Coil Design for Orthodontic Tooth Movement

2014 ◽  
Vol 493 ◽  
pp. 327-330
Author(s):  
Moch. Agus Choiron ◽  
Endi Sutikno ◽  
Tri Handoko Wicaksono ◽  
Shigeyuki Haruyama
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Steel Wire ◽  
Orthodontic Tooth Movement ◽  
Maxillary Incisor ◽  
Coil Design ◽  
Hook Length ◽  
Orthodontic Force ◽  
Custom Made ◽  
Spring Coil

Orthodontic tooth movement is achieved by the remodeling of alveolar bone in response to mechanical loading by using spring coil. Spring coil design was made of round stainless steel wire and usually it was custom-made design. In the previous study, the orthodontic force on 30 gram is required to move maxillary incisor during experimental tooth movement in rat. In this study, optimization new design of spring coil is developed to fulfill the requirement of orthodontic force. The design variable of new spring coil design is set on variation of angle aperture (5oα 10o), hook length (10 mml20 mm) and hook diameter (0.012 inchD0.014 inch). From the result, it can be produced the optimum designs which 8.9oof angle aperture; 12 mm of hook length and 0.014 inch of hook diameter for fulfilling the requirement of orthodontic force on 30 gram force.

scholarly journals Effect of Growth Hormone in Experimental Tooth Movement

2013 ◽  
Vol 24 (5) ◽  
pp. 503-507 ◽  
Author(s):  
Jucienne Salgado Ribeiro ◽  
José Vinicius Bolognesi Maciel ◽  
Luégya Amorin Henriques Knop ◽  
Maria Ângela Naval Machado ◽  
Ana Maria Trindade Grégio ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Alveolar Bone ◽  
Tooth Movement ◽  
Polarized Light ◽  
Climate Conditions ◽  
Significance Level ◽  
Collagen Formation ◽  
Male Wistar Rats ◽  
Level Group ◽  
Experimental Tooth Movement

The aim of this study was to evaluate, by histological analysis, the effect of growth hormone (GH) on periodontal ligament and alveolar bone during experimental tooth movement in rats. Eighty male Wistar rats divided into control (C) and experimental (E) groups were examined after 3, 7, 14 and 21 days under controlled climate conditions. Orthodontic force (30 cN) was applied on the maxillary first molar by an orthodontic appliance. Group E received 0.1 IU/kg/day of GH and Group C received 0.5 mL/kg/day of saline. The samples were processed and evaluated under optical microscopy and polarized light microscopy. The Kruskal Wallis test was applied to compare the intergroup variables at 5% significance level. Group E presented a larger number of osteoclasts on the 3rd and 7th days and Howship lacunae on the 3 rd day, a smaller number of blood vessels and greater amount of mature collagen on the 3 rd and 7 th days than Group C (p<0.05). It was concluded that GH accelerated and intensified bone resorption and produced delay in immature collagen formation during experimental tooth movement.

scholarly journals Comparison of the effects of three surgical techniques on the rate of orthodontic tooth movement in a rat model

2017 ◽  
Vol 87 (5) ◽  
pp. 717-724 ◽  
Author(s):  
Zachary Librizzi ◽  
Zana Kalajzic ◽  
Daniel Camacho ◽  
Sumit Yadav ◽  
Ravindra Nanda ◽  
...  
Keyword(s):  
Rat Model ◽  
Alveolar Bone ◽  
Tooth Movement ◽  
Volume Fraction ◽  
Surgical Techniques ◽  
Orthodontic Tooth Movement ◽  
Tartrate Resistant Acid Phosphatase ◽  
Bone Volume Fraction ◽  
Bone Response ◽  
Mucoperiosteal Flap

ABSTRACT Objective: To evaluate the effect of corticotomy and corticision, with and without a full mucoperiosteal flap, on the rate of tooth movement and alveolar response in a rat model. Materials and Methods: Sixty male, 6-week-old Wistar rats were divided into five groups based on surgical procedure, as follows: control (no tooth movement), orthodontic tooth movement (OTM) only, corticotomy, corticision, and corticision with full mucoperiosteal flap (corticision + flap). A force of 10–15g was applied from the maxillary left first molar to the maxillary incisors using nickel-titanium springs. Surgery was performed at the time of appliance placement (day 0), and tooth movement occurred for 21 days. Micro–computed tomography was performed on day 21 to evaluate the amount of tooth movement and alveolar bone parameters. Histomorphometry, including tartrate-resistant acid phosphatase staining, was performed to quantify the osteoclast parameters at day 21. Results: No statistical differences in the amount of OTM, bone volume fraction, and tissue density and the osteoclast parameters were found among all experimental groups. Conclusions: Corticotomy and corticision, with or without a full mucoperiosteal flap, did not show a significant effect on either the OTM magnitude or alveolar bone response.

scholarly journals Factors related to alveolar bone thickness during upper incisor retraction

2012 ◽  
Vol 83 (3) ◽  
pp. 394-401 ◽  
Author(s):  
Nuengrutai Yodthong ◽  
Chairat Charoemratrote ◽  
Chidchanok Leethanakul
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Rank Correlation ◽  
Bone Thickness ◽  
Spearman’S Rank Correlation ◽  
Computed Tomography Images ◽  
Orthodontic Patients ◽  
Incisor Retraction ◽  
Palatal Bone ◽  
Movement Change

ABSTRACT Objective: To investigate the factors related to changes in alveolar bone thickness during upper incisor retraction. Materials and Methods: The subjects consisted of 23 ongoing orthodontic patients (mean age 20.4 ± 2.7 years) whose upper incisors were bound for retraction. Changes in alveolar bone thickness in the retracted area were assessed using preretraction (T0) and postretraction (T1) cone-beam computed tomography images. Labial bone thickness (LBT), palatal bone thickness (PBT), and total bone thickness (TBT) were assessed at the crestal, midroot, and apical levels of the retracted incisors. Paired t-tests were used to compare T0 and T1 bone thickness measurements. Spearman's rank correlation analysis was performed to determine the relationship of changes in alveolar bone thickness with the rate of tooth movement, change in inclination, initial alveolar bone thickness, and the extent of intrusion. Results: As the upper incisors were retracted, the LBT at the crestal level and TBT at the apical level significantly increased (P &lt; .005). Changes in alveolar bone thickness were significantly associated with the rate of tooth movement, change in inclination, and extent of intrusion (P &lt; .05) but not initial alveolar bone thickness (P &gt; .05). Conclusion: Rate of tooth movement, change in inclination, and extent of intrusion are significant factors that may influence alveolar bone thickness during upper incisor retraction. These factors must be carefully monitored to avoid the undesirable thickening of alveolar bone.

scholarly journals Difference in the Alveolar Bone Remodeling Between the Adolescents and Adults During Upper Incisor Retraction: a Retrospective Study

2021 ◽  
Author(s):  
Ya Zheng ◽  
Chenjing Zhu ◽  
Meng Zhu ◽  
Lang Lei
Keyword(s):  
Retrospective Study ◽  
Bone Remodeling ◽  
Alveolar Bone ◽  
Ct Scanning ◽  
Maxillary Incisor ◽  
Adult Group ◽  
Bone Apposition ◽  
Alveolar Bone Remodeling ◽  
Adolescents And Adults ◽  
Incisor Retraction

Abstract Background: The purpose of this study was to compare the difference of alveolar bone remodeling between the adolescents and adults in the maxillary incisor area during retraction. Methods: This retrospective study included 72 female patients who needed moderate anchorage to correct the bimaxillary protrusion. Subjects were further divided into the minor group (n=36, 11-16 years old) and adult group (n=36, 18-35 years old). Digital lateral cephalography and cone beam CT scanning were taken in each patient before (T0) and after treatment (T1). Cephalometry was conducted to assess incisor retraction, while alveolar bone thickness (ABT), alveolar bone distance (ABD, and alveolar bone area (ABA) were detected to assess changes in the alveolar bone. Results: No difference in the inclination of upper incisors was observed at both T0 and T1. Changes in the alveolar bone showed a similar tendency with bone apposition on the labial side and resorption on the palatal side. Less increase in the labial ABT (T1-T0) and more decrease in the palatal ABT (T1-T0) was found in the adult group, leading to less total ABT in the adult group. Higher reduction inn ABD (T1-T0) was found in the adult group. Moreover, more decrease in the ABA (T1-T0) was found in the adult group. Conclusion: When compared adolescents, adult patients have less alveolar bone support after orthodontic treatment, showing a through-the-bone remodeling pattern. Orthodontic should take the age into consideration to reduce the potential periodontal risks during treatment planning.

scholarly journals Alveolar bone modeling and bone modeling/ tooth movement ratio during mandibular incisor retraction: a retrospective study

2020 ◽  
Author(s):  
Jingchen Xu ◽  
Jialiang Zhou ◽  
Yuanyuan Yin ◽  
Le Chang ◽  
Song Chen
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Cortical Plate ◽  
Bone Modeling ◽  
High Angle ◽  
Mandibular Incisor ◽  
Lingual Side ◽  
Incisor Retraction ◽  
Facial Types

Abstract Background: The objective of this study was to explore the limit of orthodontic tooth movement by evaluating changes of alveolar bone during mandibular incisor retraction and comparing the bone modeling/tooth movement (B/T) ratio among patients with different vertical facial types. Methods: There were 103 patients with bimaxillary dentoalveolar protrusion evaluated with cephalograms in this study. The alveolar bone thickness (ABT) and cortical plate remodeling at cervical level (S1), middle level (S2) and apical level (S3) in Tip and Torque groups were measured, and B/T ratio in patients with different vertical facial types was calculated. Results: After excluding growth effect, buccolingual ABT at S1 and S2, as well as labial ABT at S1 in both Tip and Torque group decreased significantly. Cortical plate at three levels in Torque group remodeled to the lingual side. But in Tip group, cortical plate at S1 remodeled to the lingual side and cortical plate at S2 and S3 remodeled to the labial side. Regarding the B/T ratio, high-angle patients was smaller than average-angle and low-angle patients. Conclusions: In conclusion, resorption of alveolar bone was more than apposition during mandibular incisor retraction. The direction of alveolar cortical modeling was as same as tooth movement and the modeling amount was proportional to the distance of tooth movement. In addition, the B/T ratio was different among patients with different vertical craniofacial patterns. Close attention should be paid to high-angle patients with narrower ABT and smaller B/T ratio. Keywords: alveolar bone modeling, orthodontic tooth movement limit, incisor retraction, vertical facial patterns

scholarly journals Cephalometric Evaluation of Alveolar Bone Remodeling following Anterior Teeth Retraction

2016 ◽  
Vol 8 (1) ◽  
pp. 21-24
Author(s):  
Darshit Dhanani ◽  
G Shivaprakash
Keyword(s):  
Bone Remodeling ◽  
Alveolar Bone ◽  
Tooth Movement ◽  
Anatomical Landmarks ◽  
Bone Thickness ◽  
Mandibular Incisor ◽  
Anterior Teeth ◽  
Alveolar Bone Remodeling ◽  
Lateral Cephalograms ◽  
Incisor Retraction

ABSTRACT Aim To evaluate the extent of the alveolar bone remodeling after incisor retraction using lateral cephalograms. Materials and methods Lateral cephalograms of 30 patients with age of 16 years and above requiring therapeutic extraction of both maxillary and mandibular first premolars, mainly for the purpose of retraction of anterior teeth, had been taken at the start of treatment and after retraction of anterior teeth. Various hard tissue anatomical landmarks were traced, and linear parameters of pretreatment (T1) and postretraction (T2) lateral cephalometric radiographs were measured. The mean and standard deviation were calculated, the data were tabulated, and comparison of T1 and T2 readings was made utilizing paired Student’s t-test. Results When maxillary incisors are retracted, the labial bone thickness at the midroot level (MxL2) and at apical level (MxL3) increased during upper incisor retraction. There was a significant reduction in alveolar bone thickness on the lingual/palatal side after maxillary and mandibular incisor retraction. Conclusion When tooth movement is limited, forcing the tooth against the cortical bone may cause adverse sequelae. This type of approach must be carefully monitored to avoid negative iatrogenic effects. How to cite this article Dhanani D, Shivaprakash G. Cephalometric Evaluation of Alveolar Bone Remodeling following Anterior Teeth Retraction. CODS J Dent 2016;8(1):21-24.

scholarly journals Changes of anterior maxillary alveolar bone thickness following incisor proclination and extrusion

2014 ◽  
Vol 85 (4) ◽  
pp. 549-554 ◽  
Author(s):  
Udom Thongudomporn ◽  
Chairat Charoemratrote ◽  
Sarayut Jearapongpakorn
Keyword(s):  
Alveolar Bone ◽  
Tooth Movement ◽  
Rank Correlation ◽  
Maxillary Incisor ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Bone Thickness ◽  
Lateral Cephalograms ◽  
Maxillary Incisors ◽  
Palatal Bone

ABSTRACT Objective:  To investigate changes in maxillary alveolar bone thickness after maxillary incisor proclination and extrusion during anterior crossbite correction in a group of growing patients with Class III malocclusion. Materials and Methods:  Maxillary incisors of 15 growing patients with anterior crossbite were proclined and extruded with 0.016″ beta-titanium advancing loops and Class III elastics. Lateral cephalograms were recorded before advancement (T0) and 4 months after a normal overjet and overbite were achieved (T1). Changes in alveolar bone thickness surrounding the maxillary incisors at the crestal (S1), midroot (S2), and apical (S3) levels were measured using cone-beam computed tomography (CBCT). Paired t-tests were used to determine the significance of the changes. A Spearman rank correlation analysis was performed to explore the relationship between thickness changes and the rate and amount of incisor movements. Results:  Although statistically significant decreases were observed in palatal and total bone thickness at the S2 and S3 level (P &lt; .05), the amounts of these changes were clinically insignificant, ranging from 0.34 to 0.59 mm. Changes in labial bone thickness at all levels were not significant. Changes in palatal bone thickness at S3 were negatively correlated with changes in incisor inclination. (r  =  −0.71; P &lt; .05). Conclusion:  In a group of growing patients with Class III malocclusion undergoing anterior crossbite correction, controlled tipping mechanics accompanied by extrusive force may produce successful tooth movement with minimal iatrogenic detriment to the alveolar bone.

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