scholarly journals Evaluation of apical root resorption in Class III patients who received one- or two-phase orthodontic treatment

2021 ◽  
Vol 11 ◽  
pp. 123-131
Author(s):  
Elif Dilara Seker ◽  
Berza Sen Yilmaz ◽  
Ahmet Yagci
Keyword(s):  
Root Length ◽  
Orthodontic Treatment ◽  
Root Resorption ◽  
Length Change ◽  
Class Iii ◽  
Two Phase ◽  
Fixed Appliance ◽  
Group 2 ◽  
Lower Incisors ◽  
Group 1

Objectives: The aim of this study was to compare the incidence root resorption and dilaceration between the patients with and without previous orthopedic treatment after the fixed orthodontic treatment. Materials and Methods: The pre- and post-treatment digitized panoramic films of 40 Class III adult patients meeting the inclusion criteria were selected from patient population of the orthodontic department. Half of the patients were treated with two-phase treatment (orthopedic therapy followed by fixed appliance treatment; Group 1), while the others wore only fixed appliances (Group 2). Root resorption was evaluated from the first molar to the first molar for each arch using the ImageJ software (Bethesda, Maryland, USA). The presence of root dilacerations was also recorded on the pre-treatment panoramic radiographs. Paired samples t-test and Mann– Whitney U-test were used to compare root length. Results: Intragroup comparisons for each tooth indicated that the upper and lower incisors, first molars and upper left second premolars presented a significant decrease in Group 1 (P < 0.05). In contrast, in Group 2, a significant decrease in tooth length was found only in the upper incisors (P < 0.05). Intergroup comparisons for root length change indicated statistically significant differences for the lower incisors, upper second premolars, and all first molars except for the upper left molars (P < 0.05). Nevertheless, the prevalence of root dilaceration in Group 1 was higher than that in Group 2. Conclusion: Class III patients who received two-phase treatments experienced more root resorption and dilaceration compared with patients who received one-phase treatments. It should be remembered that early orthopedic forces may have potential adverse effects on a dental root in the long-term.

scholarly journals Apical Resorption of Upper Incisors and Canines During Orthodontic Treatment in Class III Orthognathic Surgery Patients – a Longitudinal Cone Beam Computer Tomography Study

2017 ◽  
Vol 17 (1) ◽  
pp. 23-28
Author(s):  
Ieva Gavare ◽  
Ilga Urtane ◽  
Gundega Jakobsone ◽  
Laura Neimane
Keyword(s):  
Root Length ◽  
Orthognathic Surgery ◽  
Orthodontic Treatment ◽  
Root Resorption ◽  
Cone Beam ◽  
Class Iii ◽  
Crown Root ◽  
Post Surgery ◽  
Dentofacial Deformity ◽  
Cone Beam Computer Tomography

Summary Introduction. Although severe root resorption is rare, it is a side effect of orthodontic treatment which affects tooth prognosis. Patients with severe dentofacial deformity, for whom orthodontic treatment and orthognathic surgery was done at the age of 18 and later, had long duration orthodontic treatment and orthognathic surgery, and are at a high risk of root resorption. The impact of orthognathic surgery on root resorption has not been sufficiently studied, and therefore is an interesting topic to research. Aim of the Study. To identify the risk factors for apical root resorption of maxillary incisors and canines as a result of orthodontic and surgical treatment of Class III malocclusion involving LeFort I osteotomy. Material and methods. The root lengths of upper incisors and canines were measured on cone beam computer tomography (CBCT) scans obtained from a database of orthognathic surgery patients. As a criteria for root resorption was chosen the difference in root lengths between different time points. The measurements were performed using the scans taken before orthodontic treatment (T1), before surgery (T2), and after post surgery orthodontic treatment (T3), of 28 subjects, aged 20.5 ± 3.81 years, with the mean presurgery treatment time of 19.9 ± 8.8 months, and post-surgery time of 7.1 ± 3.1 months. Changes in root lengths during different time spans were correlated with treatment duration, the initial crown/root ratio, and the severity of dentofacial deformity (Wits appraisal, ANB angle, and overjet). Results. During T1 - T2 the roots of the lateral incisors shortened by a maximum of 0.78 ± 0.83 mm (p < 0.001), at a rate of 0.04 mm per month. During T2 - T3 the lengths of the central incisor roots decreased most by 0.49 ± 0.52 (p < 0.001) at a rate of 0.07 mm per month. The resorption speed for canines increased from 0.03 mm to 0.1 mm per month before and after surgery. There were statistically significant correlations between the crown-root ratio and the incisor root length (r = 0.319 for lateral and r = 303 for central, both p<0,05) and for canines (r = 482, p<0.01). The associations between the shortened root length, in different time spans for different teeth, and the severity of malocclusion were inconsistent. Conclusions. Overall, the shortened root length during combined orthodontic and surgical treatment might not be clinically significant. After surgery, the rate of root resorption (mm per month) increased, especially for canines. The teeth with initially shorter roots showed more resorption during treatment.

scholarly journals Root resorption in relation to a modified piezocision technique

2022 ◽  
Author(s):  
Juliana Gómez Arana ◽  
Diego Rey ◽  
Héctor Ríos ◽  
María Antonia Álvarez ◽  
Lucia Cevidanes ◽  
...  
Keyword(s):  
Root Length ◽  
Orthodontic Treatment ◽  
Root Resorption ◽  
Collagen Matrix ◽  
Control Group ◽  
Acceleration Techniques ◽  
Significant Difference ◽  
3D Collagen ◽  
Experimental Group ◽  
Lower Incisors

ABSTRACT Objectives To evaluate root resorption of lower incisors and canines quantitatively in a group of patients who underwent orthodontic treatment with piezocision and/or a collagen reinforcement technique with a fully resorbable three-dimensional (3D) collagen xenograft matrix compared with a control group. Materials and Methods The study sample of this secondary analysis consisted of 32 periodontally healthy patients with angle Class I malocclusion or mild Class II or III malocclusion and moderate irregularity index scores who underwent orthodontic treatment and had before (T0) and after treatment (T1) cone-beam computed tomography scans. Root resorption of lower incisors and canines was assessed quantitatively in the following four groups: the control group received orthodontic treatment without piezocision, experimental group 1 received orthodontic treatment with piezocision, experimental group 2 received orthodontic treatment with piezocision and a 3D collagen matrix, and experimental group 3 received orthodontic treatment with a 3D collagen matrix. Results An overall statistically significant decrease in root length from T0 to T1 for all groups was observed (P &lt; .05). However, there was no significant difference among the groups in the amount of root length decrease from T0 to T1. Conclusions Orthodontic treatment combined with piezocision does not increase the risk of root resorption of lower incisors and canines when compared with orthodontic treatment without acceleration techniques. More studies with larger samples should be undertaken to confirm these results.

scholarly journals Predisposing factors to severe external root resorption associated to orthodontic treatment

2013 ◽  
Vol 18 (1) ◽  
pp. 110-120 ◽  
Author(s):  
Gracemia Vasconcelos Picanço ◽  
Karina Maria Salvatore de Freitas ◽  
Rodrigo Hermont Cançado ◽  
Fabricio Pinelli Valarelli ◽  
Paulo Roberto Barroso Picanço ◽  
...  
Keyword(s):  
Root Length ◽  
Orthodontic Treatment ◽  
Alveolar Bone ◽  
Root Resorption ◽  
Treatment Time ◽  
Predisposing Factors ◽  
Crown Root ◽  
External Root Resorption ◽  
Lateral Cephalograms ◽  
Maxillary Incisors

OBJECTIVE: The aim of this study was to evaluate predisposing factors among patients who developed moderate or severe external root resorption (Malmgren's grades 3 and 4), on the maxillary incisors, during fixed orthodontic treatment in the permanent dentition. METHODS: Ninety-nine patients who underwent orthodontic treatment with fixed edgewise appliances were selected. Patients were divided into two groups: G1 - 50 patients with no root resorption or presenting only apical irregularities (Malmgren's grades 0 and 1) at the end of the treatment, with mean initial age of 16.79 years and mean treatment time of 3.21 years; G2 - 49 patients presenting moderate or severe root resorption (Malmgren's grades 3 and 4) at the end of treatment on the maxillary incisors, with mean initial age of 19.92 years and mean treatment time of 3.98 years. Periapical radiographs and lateral cephalograms were evaluated. Factors that could influence the occurrence of severe root resorption were also recorded. Statistical analysis included chi-square tests, Fisher's exact test and independent t tests. RESULTS: The results demonstrated significant difference between the groups for the variables: Extractions, initial degree of root resorption, root length and crown/root ratio at the beginning, and cortical thickness of the alveolar bone. CONCLUSION: It can be concluded that: Presence of root resorption before the beginning of treatment, extractions, reduced root length, decreased crown/root ratio and thin alveolar bone represent risk factors for severe root resorption in maxillary incisors during orthodontic treatment.

scholarly journals Apical root resorption during orthodontic treatment with aligners? A retrospective radiometric study

2013 ◽  
Vol 9 (1) ◽  
Author(s):  
Elena Krieger ◽  
Thomas Drechsler ◽  
Irene Schmidtmann ◽  
Collin Jacobs ◽  
Simeon Haag ◽  
...  
Keyword(s):  
Root Length ◽  
Orthodontic Treatment ◽  
Influence Factor ◽  
Root Resorption ◽  
Post Treatment ◽  
Anterior Crowding ◽  
Anterior Teeth ◽  
Lateral Cephalograms ◽  
Length Changes ◽  
Pre Treatment

Abstract Introduction Objective of this study was to investigate the incidence and severity of apical root resorptions (ARR) during orthodontic treatment with aligners. Materials and methods The sample comprised 100 patients (17–75 years of age) with a class I occlusion and anterior crowding before treatment, treated exclusively with aligners (Invisalign®, Align Technologies, Santa Clara, CA, USA). The following teeth were assessed: upper and lower anterior teeth and first molars. Root and crown lengths of a total of 1600 teeth were measured twice in pre- and post-treatment panoramic radiographs. Afterwards, relative changes of the root length during treatment were calculated by a root-crown-ratio taking pre- and post-treatment root and crown lengths into consideration. A reduction of this ratio was considered as a shortening of the initial root length. Additionally, tooth movements of the front teeth were assessed by lateral cephalograms and the 3-dimensonal set up of each patient. Results All patients had a reduction of the pre-treatment root length with a minimum of two teeth. On average 7.36 teeth per patient were affected. 54% of 1600 measured teeth showed no measurable root reduction. A reduction of >0%-10% of the pre-treatment root length was found in 27.75%, a distinct reduction of >10%-20% in 11.94%. 6.31% of all teeth were affected with a considerable reduction of >20%. We found no statistically significant correlation between relative root length changes and the individual tooth, gender, age or sagittal and vertical orthodontic tooth movement; except for extrusion of upper front teeth, which was considered as not clinical relevant due to the small amount of mean 4% ARR. Conclusions The present study is the first analyzing ARR in patients with a fully implemented orthodontic treatment with aligners (i.e. resolving anterior crowding). The variety was high and no clinical relevant influence factor could be detected. A minimum of two teeth with a root length reduction was found in every patient. On average, 7.36 teeth per patient were affected.

Middle and Lower Facial Soft Tissue Changes after Maxillary Advancement through Conventional or High Le Fort I Osteotomy: A Case Series Study

2019 ◽  
Author(s):  
Ramin Foroughi ◽  
Oveis Khakbaz ◽  
Mehrdad Maneshi
Keyword(s):  
Case Series ◽  
Mean Difference ◽  
Class Iii ◽  
Le Fort I Osteotomy ◽  
Le Fort ◽  
Maxillary Advancement ◽  
Tissue Changes ◽  
Group 2 ◽  
Le Fort I ◽  
Group 1

Introduction Maxillary advancementis applied extensively for malocclusion class III correction.This procedure is done using one of the two methods, Conventional or High. Maxilla moves in both vertical and horizontal and only in the horizontal directions in Conventional and High method respectively, so expecting a difference in facialsoft tissue changes. In present study is a case series that describes this issue. Materials and Methods: The cases included 30 patients with class III malocclusion due to maxillary deficiency, whom underwent Le Fort I osteotomy for maxillary advancement in Shahid Beheshti Hospital in Babol, Iran during 1995 to 1995. According to surgical technique, the cases were placed in group 1 (Conventional) or group 2 (High). Maxillary advancement and changes in hard and soft tissue of the middle and lower facial regions where measured through tracing on the lateral cephalometry. Intra-group and inter-group statistical comparisons were done using SPSS20 software at significance level as 0.05. Result: The pre-surgical mean size of SNA, SNB, nasolabial and mentolabial angles was similar in two groups. In all patients, after surgery, SNA angle size was increased and SNB، nasolabial and Mentolabial angles size were decreased. The mean value of these change was similar in two groups. In group 2, the displacement of point A ‘(mean difference: 1.30 mm) and Labrale Superius (mean difference: 1.40 mm) were significantly more than group 1. The amount of displacement of SN (mean difference: 1.30 mm), Labrale Inferius (mean difference: 0.88 mm) and Pogonion (mean difference: 0.23 mm) points in group 2 was higher than that of group 1, but this difference was not statistically significant. Conclusion: It is needed strong evidence for decision about selecting High or Conventional approach maxillary advancement in terms of facial aesthetic aspects. So, further studies with larger sample sizes and cohort or quasi-experimental design is suggested

scholarly journals Stability in Dental Changes in RME and SARME: A 2-Year Follow-up

2009 ◽  
Vol 79 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Oral Sokucu ◽  
H. Huseyin Kosger ◽  
A. Altug Bıcakci ◽  
Hasan Babacan
Keyword(s):  
Orthodontic Treatment ◽  
Rapid Maxillary Expansion ◽  
Study Group ◽  
Maxillary Expansion ◽  
Patient Groups ◽  
Group 2 ◽  
Maxillary Arch ◽  
Group 1 ◽  
Dental Casts

Abstract Objective: To compare the effects of rapid maxillary expansion (RME) and surgically assisted rapid maxillary expansion (SARME) on dentoalveolar structures following orthodontic treatment, as well as stability at 2-year follow-up. Materials and Methods: Two groups of subjects were used in the study. Group 1 consisted of 14 subjects (mean age, 12.7 ± 1.4 years) who were treated with RME, and Group 2 consisted of 13 subjects (mean age, 18.5 ± 2.3 years) who were treated with SARME. In both groups, all cases had a maxillary width deficiency with bilateral crossbites. Maxillary dental casts were available at three different intervals: pretreatment (T1), after orthodontic treatment (T2), and at follow-up recall (T3). Intermolar and interpremolar width, palatal height, and maxillary arch depth and length were assessed from maxillary dental casts. Results: Treatment by RME and SARME produced significant increases in intermolar and interpremolar width and maxillary arch length after expansion (T2) (P &lt; .05). The amount of relapse was not significantly different 2 years after treatment (P &gt; .05). Conclusions: Although age ranges of the patient groups are different, the dentoalveolar responses of RME and SARME were similar after orthodontic treatment. (Angle Orthod. 2009:79; )

Two-Group Relative Velocity in Boiling Two-Phase Flow

2012 ◽  
Author(s):  
Caleb S. Brooks ◽  
Basar Ozar ◽  
Takashi Hibiki ◽  
Mamoru Ishii
Keyword(s):  
General Expression ◽  
Relative Velocity ◽  
Fluid Model ◽  
Two Phase ◽  
Drift Flux ◽  
Distribution Parameters ◽  
Two Fluid Model ◽  
Group 2 ◽  
Two Fluid ◽  
Group 1

In an effort to improve the prediction of void fraction and heat transfer characteristics in two-phase systems, the two-group interfacial area transport equation has been developed for use with the two-group two-fluid model. In the one-dimensional formulation, a closure relation is required for the group-1 and group-2 area-average local relative velocity. Furthermore, in the case of the modified two-fluid model with the gas-mixture momentum equation, the group-1 and group-2 void weighted gas velocities must be calculated with additional closure relations. Therefore, the drift-flux general expression is extended to two bubble groups in order to describe the group-1 and group-2 void weighted gas velocities and area-averaged local relative velocities. Correlations for group-1 and group-2 distribution parameters and drift velocities are proposed and evaluated with a dataset containing 57 boiling conditions taken in an internally heated annulus. The proposed distribution parameters show an agreement within +/−5%. The overall estimation of group-1 and group-2 void weighted gas velocities calculated with the newly proposed two-group drift-flux general expression shows an agreement within +/−15% of the measured value.

scholarly journals Lateral and apical root resorption in teeth orthodontically moved into edentulous ridge areas

2020 ◽  
Vol 25 (5) ◽  
pp. 24-29
Author(s):  
Adilson Luiz Ramos ◽  
Rodrigo Lorenzi Poluha ◽  
Pablo Guilherme ◽  
Gabriel Araújo Khoury ◽  
Joao Marcos Pedro Rosa Junior
Keyword(s):  
Root Resorption ◽  
Control Group ◽  
Orthodontic Movement ◽  
Apical Root Resorption ◽  
External Root Resorption ◽  
Before And After ◽  
External Apical Root Resorption ◽  
Group 2 ◽  
Control Group Group ◽  
Group 1

ABSTRACT Objective: The present study aimed at comparing the external lateral root resorption (ELRR) and external apical root resorption (EARR) between teeth moved through the atrophic edentulous ridge and those undergoing the usual orthodontic movement. Methods: Fifty-four premolars were evaluated, where 27 of them had been moved toward the edentulous ridge (Group 1) and 27 from the same patient, had not been translated, which comprised the control group (Group 2). ELRR was evaluated by 0-3 scores and EARR was evaluated by 0-4 scores, before and after movement. Measurements were compared by Kruskal-Wallis and Student-Newman-Keuls tests. Results: ELRR increased statistically only in the Group 1 (p< 0.05). After orthodontic treatment, it was observed that almost 56% (n = 15) of teeth in Group 1 presented scores 2 and 3, while Group 2 presented scores 2 and 3 in about 11% (n= 3) of the teeth. EARR increased in both groups after orthodontic movement, however, statistically analyses showed no significant differences between groups (p> 0.05). Conclusions: Orthodontic movement into the atrophic edentulous ridge is subject to a greater lateral external root resorption.

scholarly journals Outcomes in patients with hypertension and type 2 diabetes receiving a stent for angina

2020 ◽  
Vol 25 (4) ◽  
pp. 3800
Author(s):  
R. N. Akhtereyev ◽  
A. S. Galyavich ◽  
L. V. Baleeva ◽  
Z. M. Galeeva
Keyword(s):  
Myocardial Infarction ◽  
Blood Pressure ◽  
Type 2 Diabetes ◽  
Stent Insertion ◽  
Class Iii ◽  
Group 2 ◽  
Artery Disease ◽  
Group 1

Aim. To study the outcomes in hypertensive (HTN) patients receiving a stent for class III angina, depending on concomitant type 2 diabetes (T2D).Material and methods. The study included 295 patients aged 45 to 75 years. All patients underwent coronary angiography followed by elective stenting. Clinical outcomes were evaluated after outpatient follow-up (average 44 months). Patients were divided into two groups: group 1 — 214 patients with coronary artery disease (CAD) in combination with HTN; group 2 — 81 patients with CAD in combination with HTN and T2D.Results.In the group of patients without T2D, during the follow-up period, class III angina was observed in 92 patients (43%). The decrease in systolic blood pressure (BP) (SBP) and diastolic BP (DBP) in this subgroup was 18 and 14 mm Hg, respectively (p<0,001); 35 patients (38%) had myocardial infarction (MI). In the group of patients with T2D, class III angina was recorded in 60 patients (74,1%). The decrease in SBP and DBP in this subgroup was 19 and 12 mm Hg, respectively  (p<0,001). There were 58 cases of MI in this subgroup (96,7%).Conclusion.After stent insertion, patients with CAD, HTN and T2D still reporting class III angina were more likely to have MI than patients without T2D. This indicates a greater contribution of T2D to MI development, despite an equal decrease of SBP in patients with/without T2D.

scholarly journals Antimicrobial resistance of bacterial strains in patients undergoing orthodontic treatment with and without fixed appliances

2021 ◽  
Author(s):  
Bruno Andrade Pellissari ◽  
Gabriela Sergini Pereira Sabino ◽  
Roberto Nepomuceno de Souza Lima ◽  
Rogério Heládio Lopes Motta ◽  
Selly Sayuri Suzuki ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Orthodontic Treatment ◽  
Bacterial Resistance ◽  
Control Group ◽  
Orthodontic Appliances ◽  
Bacterial Strains ◽  
Fixed Orthodontic Appliances ◽  
Fixed Appliances ◽  
Group 2 ◽  
Group 1

ABSTRACT Objectives To identify microorganisms isolated from patients wearing fixed orthodontic appliances and to evaluate the resistance of isolated bacterial strains to different antimicrobials. Materials and Methods Seventeen healthy patients wearing a fixed orthodontic appliance (group 1) and six nonwearers (group 2, control group) were evaluated. The biofilm that formed around the orthodontic brackets was collected, and the samples were then plated in a chromogenic medium (chromIDT, bioMérieux). Colony-forming units (CFUs) were isolated and inoculated in blood-agar medium. Automated biochemical tests (VITEK 2, bioMérieux) were carried out to identify the genus and species of the microorganisms and the resistance provided by 43 drugs (37 antibacterial and 6 antifungal). Results The most prevalent microbial genera identified in group 1 were Streptococcus (24.0%), Staphylococcus (20.0%), Enterobacter (12.0%), Geobacillus (12.0%), and Candida (12.0%), and the most frequent species were Enterobacter cloacae complex (13.6%) and Staphylococcus hominis (13.6%). In group 2, the most prevalent genera were Streptococcus (57.1%), Staphylococcus (14.2%), Sphingomonas (14.2%), and Enterobacter (14.2%). With regard to antimicrobial resistance, 14 of 19 (74%) isolated bacterial strains were found to be resistant to at least 1 of the tested antimicrobials. Conclusions The findings of the present study suggest that patients undergoing orthodontic treatment with fixed appliances have a more complex biofilm with a higher level of bacterial resistance.

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