scholarly journals Alveolar bone changes after asymmetric rapid maxillary expansion

2014 ◽  
Vol 85 (5) ◽  
pp. 799-805 ◽  
Author(s):  
Mehmet Akin ◽  
Zeliha Muge Baka ◽  
Zehra Ileri ◽  
Faruk Ayhan Basciftci
Keyword(s):  
Cortical Bone ◽  
Alveolar Bone ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Unaffected Side ◽  
Posterior Teeth ◽  
Cortical Bone Thickness ◽  
Paired Samples ◽  
Affected Side

ABSTRACT Objective:  To quantitatively evaluate the effects of asymmetric rapid maxillary expansion (ARME) on cortical bone thickness and buccal alveolar bone height (BABH), and to determine the formation of dehiscence and fenestration in the alveolar bone surrounding the posterior teeth, using cone-beam computed tomography (CBCT). Materials and Methods:  The CBCT records of 23 patients with true unilateral posterior skeletal crossbite (10 boys, 14.06 ± 1.08 years old, and 13 girls, 13.64 ± 1.32 years old) who had undergone ARME were selected from our clinic archives. The bonded acrylic ARME appliance, including an occlusal stopper, was used on all patients. CBCT records had been taken before ARME (T1) and after the 3-month retention period (T2). Axial slices of the CBCT images at 3 vertical levels were used to evaluate the buccal and palatal aspects of the canines, first and second premolars, and first molars. Paired samples and independent sample t-tests were used for statistical comparison. Results:  The results suggest that buccal cortical bone thickness of the affected side was significantly more affected by the expansion than was the unaffected side (P < .05). ARME significantly reduced the BABH of the canines (P < .01) and the first and second premolars (P < .05) on the affected side. ARME also increased the incidence of dehiscence and fenestration on the affected side. Conclusions:  ARME may quantitatively decrease buccal cortical bone thickness and height on the affected side.

scholarly journals Buccal alveolar bone changes following rapid maxillary expansion and fixed appliance therapy

2020 ◽  
Author(s):  
Adam Sperl ◽  
Laurence Gaalaas ◽  
John Beyer ◽  
Thorsten Grünheid
Keyword(s):  
Computed Tomography ◽  
Alveolar Bone ◽  
Treatment Time ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Fixed Appliance ◽  
Computed Tomography Scans ◽  
Bone Changes

ABSTRACT Objectives To assess factors that may be associated with buccal bone changes adjacent to maxillary first molars after rapid maxillary expansion (RME) and fixed appliance therapy. Materials and Methods Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were obtained from 45 patients treated with RME and preadjusted edgewise appliances. Buccal alveolar bone thickness was measured adjacent to the mesiobuccal root of the maxillary first molar 4 mm, 6 mm, and 8 mm apical to the cementoenamel junction, and anatomic defects were recorded. Paired and unpaired t-tests were used to compare alveolar bone thickness at T1 and T2 and to determine whether teeth with posttreatment anatomic defects had thinner initial bone. Correlation analyses were used to examine relationships between buccal alveolar bone thickness changes and amount of expansion, initial bone thickness, age at T1, postexpansion retention time, and treatment time. Results There was a statistically significant reduction in buccal alveolar bone thickness from T1 to T2. Approximately half (47.7%) of the teeth developed anatomic defects from T1 to T2. These teeth had significantly thinner buccal bone at T1. Reduction in alveolar bone thickness was correlated with only one tested variable: initial bone thickness. Conclusions RME and fixed-appliance therapy can be associated with significant reduction in buccal alveolar bone thickness and an increase in anatomic defects adjacent to the expander anchor teeth. Anchor teeth with greater initial buccal bone thickness have less reduction in buccal bone thickness and are less likely to develop posttreatment anatomic defects of buccal bone.

scholarly journals Optimal implantation site of orthodontic micro-screws in the mandibular anterior region based on CBCT

2019 ◽  
Author(s):  
Yannan Wang ◽  
Shi Quan ◽  
Juan Xu ◽  
Feng Wang
Keyword(s):  
Cortical Bone ◽  
Alveolar Bone ◽  
Comprehensive Evaluation ◽  
Lateral Incisor ◽  
Implantation Site ◽  
Alveolar Ridge ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Ridge Crest ◽  
Anterior Teeth

Abstract Background To determine the optimal implantation site of orthodontic micro-screws based on cone beam computed tomography (CBCT) analysis in the mandibular anterior tooth region, provide a theoretical basis for orthodontic implant placement and improve post-implantation stability. Methods Forty patients who underwent CBCT scanning were selected for this study. CBCT scanning was applied to measure the interradicular distance, buccolingual dimension, labial cortical bone thickness and lingual cortical bone thickness between mandibular anterior teeth at planes 2 mm, 4 mm, 6 mm and 8 mm below the alveolar ridge crest. The data were measured and collected to obtain a comprehensive evaluation of the specific site conditions of the alveolar bone. Results The interradicular distance, buccolingual dimension and labial cortical bone thickness between the mandibular anterior teeth were positively correlated with the distance below the alveolar ridge crest (below 8 mm). The interradicular distance, buccolingual dimension, labial cortical bone thickness and lingual cortical bone thickness were all greater than those in other areas between the lateral incisor root and canine incisor root 4 mm, 6 mm, and 8 mm below the alveolar ridge crest. Conclusion The area between the lateral incisor root and the canine incisor root in planes 4 mm, 6 mm, and 8 mm from the alveolar ridge crest can be used as safe sites for implantation, while 8 mm below the alveolar ridge crest can be the optimal implantation site. An optimal implantation site can be 8 mm below the alveolar ridge crest between the lateral incisor root and the canine incisor root.

scholarly journals Evaluation of mandibular inferior cortical bone thickness using panoramic radiographs in edentulous and dentate cases

2019 ◽  
Author(s):  
Reza Derafshi ◽  
Janan Ghapanchi ◽  
Mitra Farzin ◽  
Abdolaziz Haghnegahdar ◽  
Maryam Zahed ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Cortical Thickness ◽  
Tooth Loss ◽  
Reference Points ◽  
Bone Thickness ◽  
Posterior Teeth ◽  
Panoramic Radiographs ◽  
Cortical Bone Thickness ◽  
Anterior Teeth ◽  
Significant Difference

Abstract Background: Osteoporosis is a disease of the bone structure which has many outcomes for the patient. Tooth loss and failure of implant placement can be related to this disorder in the jaw bones which is shown by the reduction of mandibular inferior cortical thickness. The aim of this study is to find a relationship between mandibular inferior cortical thickness using panoramic radiographs and tooth existence. Methods: A total of 57 panoramic views of complete edentulous patients and 164 partial edentulous cases were evaluated and compared to 117 dentate age and sex matched subjects. Mandibular cortical thickness was measured on 3 reference points (below the mental foramen (S1), estimated position of the first molar (S2) estimated position of the third molar (S3)) on both left and right sides using marking gauge in Agfa program. Results: Data revealed that cortical bone thickness was significantly reduced in older patients (P=0.031). The final value of the three measurements of the mandibular border thickness was 2.3128mm ± 0.74840 in the right side (RS) and 2.407±0.802 mm in the left side (LS) for the complete edentulous group, 2.9026± 0.7513 mm in RS and 2.9976 ±1.06769 in LS for partial edentulous group and 2.8709± 0.6263 in RS and 2.9812 ±0.83081 in LS for the dentate cases. Complete edentulous cases and partial edentulous cases that had lost posterior teeth had no significant difference in cortical thickness, but both groups had a significant thinner cortical width compared to dentate subjects (P= 0.001 and P=0.002). But lack of anterior teeth did not have the same effect compared to dentate individuals (P=0.929). Conclusions: The present study demonstrates a significant relationship between tooth loss in the posterior region and reduction of inferior mandibular border which is a value of osteoporosis. Anterior tooth loss however does not have the same effect. Dentist and physicians should be in close contact in such patients to avoid further tooth loss and also diagnose this chronic disease in earlier stages.

scholarly journals Optimal Implantation Site of Orthodontic Micro-Screws in the Mandibular Anterior Region Based on CBCT

2021 ◽  
Vol 12 ◽  
Author(s):  
Yannan Wang ◽  
Quan Shi ◽  
Feng Wang
Keyword(s):  
Cortical Bone ◽  
Alveolar Bone ◽  
Comprehensive Evaluation ◽  
Lateral Incisor ◽  
Implantation Site ◽  
Alveolar Ridge ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Ridge Crest ◽  
Anterior Teeth

Background: To determine the optimal implantation site of orthodontic micro-screws based on cone beam computed tomography (CBCT) analysis in the mandibular anterior tooth region, provide a theoretical basis for orthodontic implant placement and improve post-implantation stability.Methods: Forty patients who underwent CBCT scanning were selected for this study. CBCT scanning was applied to measure the interradicular distance, buccolingual dimension, labial cortical bone thickness and lingual cortical bone thickness between mandibular anterior teeth at planes 2, 4, 6, and 8 mm below the alveolar ridge crest. The data were measured and collected to obtain a comprehensive evaluation of the specific site conditions of the alveolar bone.Results: The interradicular distance, buccolingual dimension and labial cortical bone thickness between the mandibular anterior teeth were positively correlated with the distance below the alveolar ridge crest (below 8 mm). The interradicular distance, buccolingual dimension, labial cortical bone thickness, and lingual cortical bone thickness were all greater than those in other areas between the lateral incisor root and canine incisor root 4, 6, and 8 mm below the alveolar ridge crest.Conclusion: The area between the lateral incisor root and the canine incisor root in planes 4, 6, and 8 mm from the alveolar ridge crest can be used as safe sites for implantation, while 8 mm below the alveolar ridge crest can be the optimal implantation site. An optimal implantation site can be 8 mm below the alveolar ridge crest between the lateral incisor root and the canine incisor root.

scholarly journals Influence of the growth pattern on cortical bone thickness and mini-implant stability

2020 ◽  
Vol 25 (6) ◽  
pp. 33-42
Author(s):  
Carolina Carmo de Menezes ◽  
Sérgio Estelita Barros ◽  
Diego Luiz Tonello ◽  
Aron Aliaga-Del Castillo ◽  
Daniela Garib ◽  
...  
Keyword(s):  
Success Rate ◽  
Cortical Bone ◽  
Cortical Thickness ◽  
Growth Pattern ◽  
Alveolar Bone ◽  
Insertion Site ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants ◽  
The Stability

ABSTRACT Introduction: Controversial reports suggest a relationship between growth pattern and cortical alveolar bone thickness, and its effect in the use of mini-implants. Objective: The main purpose of this study was to assess the influence of the growth pattern on the cortical alveolar bone thickness and on the stability and success rate of mini-implants. Methods: Fifty-six mini-implants were inserted in the buccal region of the maxilla of 30 patients. These patients were allocated into two groups, based on their growth pattern (horizontal group [HG] and vertical group [VG]). Cortical thickness was measured using Cone Beam Computed Tomography. Stability of mini-implants, soft tissue in the insertion site, sensitivity during loading and plaque around the mini-implants were evaluated once a month. Intergroup comparisons were performed using t tests, Mann-Whitney tests, and Fisher exact tests. Correlations were evaluated with Pearson’s correlation coefficient. Results: The cortical bone thickness was significantly greater in the HG at the maxillary labial anterior region and at the mandibular buccal posterior and labial anterior regions. There was a significant negative correlation between Frankfort-mandibular plane angle (FMA) and the labial cortical thickness of the maxilla, and with the labial and lingual cortical bone thicknesses of the mandible. No significant intergroup difference was found for mini-implant mobility and success rate. No associated factor influenced stability of the mini-implants. Conclusions: Growth pattern affects the alveolar bone cortical thickness in specific areas of the maxilla and mandible, with horizontal patients presenting greater cortical bone thickness. However, this fact may have no influence on the stability and success rate of mini-implants in the maxillary buccal posterior region.

scholarly journals Skeletal width changes after mini-implant–assisted rapid maxillary expansion (MARME) in young adults

2021 ◽  
Author(s):  
Hongyi Tang ◽  
Panpan Liu ◽  
Xueye Liu ◽  
Yingyue Hou ◽  
Wenqian Chen ◽  
...  
Keyword(s):  
Young Adults ◽  
Cortical Bone ◽  
Pearson Correlation ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Contributing Factors ◽  
Mini Implants ◽  
Pterygoid Plate ◽  
Pearson Correlation Analysis

ABSTRACT Objectives To observe skeletal width changes after mini-implant–assisted rapid maxillary expansion (MARME) and determine the possible factors that may affect the postexpansion changes using cone-beam computed tomography (CBCT) in young adults. Materials and Methods Thirty-one patients (mean age 22.14 ± 4.76 years) who were treated with MARME over 1 year were enrolled. Four mini-implants were inserted in the midpalatal region, and the number of activations ranged from 40 to 60 turns (0.13 per turn). CBCT was performed before MARME (T0), after activation (T1), and after 1 year of retention (T2). The mean period between T1 and T0 was 6 ± 1.9 months and between T2 and T1 was 13 ± 2.18 months. A paired t-test was performed to compare T0, T1, and T2. The correlations between the postexpansion changes and possible contributing factors were analyzed by Pearson correlation analysis. Results The widths increased significantly after T1. After T2, the palatal suture width decreased from 2.50 mm to 0.75 mm. From T1 to T2, decreases recorded among skeletal variables varied from 0.13 mm to 0.41 mm. This decrease accounted for 5.75% of the total expansion (2.26 mm) in nasal width (N-N) and 19.75% at the lateral pterygoid plate. A significant correlation was found between postexpansion change and palatal cortical bone thickness and inclination of the palatal plane (ANS-PNS/SN; P < .05). Conclusions Expanded skeletal width was generally stable after MARME. However, some amount of relapse occurred over time. Patients with thicker cortical bone of the palate and/or flatter palatal planes seemed to demonstrate better stability.

RAPID PALATAL EXPANSION AND ITS FEATURES

ASJ. ◽  
2020 ◽  
Vol 2 (40) ◽  
pp. 20-22
Author(s):  
A.K. Al Dzhafari ◽  
S.A. Ulyanovskaya
Keyword(s):  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Maxillofacial Region ◽  
Posterior Teeth ◽  
Anatomical Features ◽  
Palatal Expansion ◽  
Rapid Palatal Expansion ◽  
Congenital Deformities ◽  
Upper Jaw ◽  
Mid Palatal Suture

Rapid Maxillary expansion or palatal expansion as it is sometimes called, occupies unique niche in dentofacial therapy. Rapid Maxillary expansion (RME) is a skeletal type of expansion that involves the separation of the mid-palatal suture and movement of the maxillary shelves away from each other. RME effects the maxillary complex, palatal vaults, maxillary anterior and posterior teeth, adjacent periodontal structures to bring about an expansion in the maxillary arch. Morphogenesis and anatomical features of the upper jaw determine the choice of the method of rapid palatal expansion with narrowing of the upper dentition, as an effective method for eliminating congenital deformities of the maxillofacial region. The majority of dental transverse measurements changed significantly as a result of RME. The maturity of the maxillofacial structures determines the timing and degree of success of rapid palatal dilatation treatment.

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