scholarly journals Optimal sites for orthodontic anchor screw placement using panoramic images: risk of maxillary sinus perforation and contact with adjacent tooth roots during screw placement

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Ken Miyazawa ◽  
Momoko Shibata ◽  
Masako Tabuchi ◽  
Misuzu Kawaguchi ◽  
Noriko Shimura ◽  
...  
Keyword(s):  
Maxillary Sinus ◽  
Alveolar Bone ◽  
Screw Placement ◽  
Imaging Data ◽  
Bone Thickness ◽  
Maxillary Molars ◽  
Alveolar Crest ◽  
Tooth Roots ◽  
Increased Risk ◽  
Panoramic Images

Abstract Objectives This study investigated the safety of orthodontic anchor screw (OAS) placement by examining the morphology and degree of depression of the maxillary sinus adjacent to the alveolar bone between the maxillary molars. Methods We reviewed panoramic and CT imaging data of 25 patients. First, the morphology of the maxillary sinus adjacent to the alveolar bone between the maxillary molars on panoramic images was classified into three types: non-depressed sinus, funnel-like sinus depression, and sawtooth-like sinus depression. Then, the distance from the maxillary buccal bone to the maxillary sinus or to the maxillary lingual bone and the distance between the roots of the maxillary second premolar and first molar at heights of 5, 6.5, and 8 mm from the alveolar crest were measured on CT images and compared between the three sinus morphology groups. Results The sawtooth-like depression group had significantly smaller bone thickness than the other two groups, with mean thickness of < 4 mm at any height from the alveolar crest. The funnel-like depression and non-depression groups had mean bone thickness of > 8 mm at any height from the alveolar crest. Conclusions Sawtooth-like sinus depression had increased risk of maxillary sinus perforation, suggesting that OAS placement in this region should be avoided. In contrast, OAS placement between 6.5 and 8 mm from the alveolar crest is advisable in patients with funnel-like sinus depression and at a site > 8 mm from the alveolar crest in those with a non-depressed sinus.

scholarly journals An Analysis of The Relationship between The Maxillary Molars and The maxillary sinus floor in Adult Patient Using Cone-beam Computed Tomography

2019 ◽  
Author(s):  
Lin Li ◽  
Yifan Fu ◽  
Shihui Huang ◽  
Ziya Lai ◽  
Chenghao Li ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Maxillary Sinus ◽  
Cone Beam Computed Tomography ◽  
Alveolar Bone ◽  
Third Molar ◽  
Cone Beam ◽  
Maxillary Molars ◽  
Bone Width ◽  
Internal Angle ◽  
Vertical Relationship

Abstract Background The aim of the study was to evaluate the anatomical relationship between the maxillary molars and the maxillary sinus by using cone beam computed tomography (CBCT).Methods A database of maxillary molars were obtained from 91 adult patients by means of images of CBCT. The internal angle, the alveolar bone width, and the distance between root apex and the wall of maxillary sinus were measured by CBCT. The vertical relationship between the maxillary molars and the maxillary sinus were analysed. Vertical relationship of the maxillary sinus was further evaluated. Results The value of the internal angle of maxillary third molar is 17.2 ± 11.5°. The width of the alveolar bone of third molar is 8.2 ± 1.7mm. Type III, IV and V were the most common relationship in the first and second molars. Type V and I were most frequently observed in the first and second molars. The inner angle of the second molar is larger than that of the first molar. The maxillary first molar had the smallest mean alveolar bone width, and the third molar had the largest average. Conclusion This study will provide reference for clinical practice, especially for root canal treatment and tooth implants.

scholarly journals Correlation analysis of periodontal tissue dimensions in esthetic zone using a non-invasive digital method

2019 ◽  
Author(s):  
Yun-Jeong Kim ◽  
Ji-Man Park ◽  
Hyun-Jae Cho ◽  
Young Ku
Keyword(s):  
Alveolar Bone ◽  
Digital Method ◽  
Clinical Parameters ◽  
Bone Thickness ◽  
Gingival Thickness ◽  
Periodontal Tissues ◽  
Non Invasive ◽  
Crown Length ◽  
Crown Width ◽  
Alveolar Crest

Abstract Background. Recently, direct intraoral scanning and superimposing methods have been applied to measure the dimensions of periodontal tissues. The aim of this study was to analyze various correlations between labial gingival thickness and underlying alveolar bone thickness as well as clinical parameters among the three tooth types (central incisors, lateral incisors, and canines) using the digital method. Methods. In 20 periodontally healthy subjects, cone-beam computed tomography (CB-CT) images and intraoral scanned files were obtained. Measurements of labial alveolar bone and gingival thickness at the central incisors, lateral incisors, and canines were performed at 0–5 mm points from the alveolar crest on the superimposed images. Clinical parameters including the crown width/crown length ratio (CW/CL), gingival width (GW), gingival scallop (SC), and transparency of the periodontal probe through the gingival sulcus (TRAN) were examined. Results. Gingival thickness at the alveolar crest level was positively correlated with the thickness of the alveolar bone plate (p<0.05). The central incisors revealed a strong correlation between A1 and A2 (labial alveolar bone thickness at 1 and 2 mm, respectively, inferior to the alveolar crest) with the thickness of the gingiva at the G0, whereas G0 and labial bone thickness at every level were positively correlated at the lateral incisors and canines. The correlation analyses revealed no significant correlation between the clinical parameters and the hard and soft tissue thicknesses. Conclusions. The gingival thickness at the alveolar crest level revealed a positive correlation with labial alveolar bone thickness, although this correlation at identical depth levels was not significant. The measurement of gingival thickness at, or under the alveolar crest level, was not associated with the clinical parameters of the gingival features, such as the crown form and the gingival scallop, or the keratinized gingival width. Therefore, it is recommended that, in future studies, accurate measuring methods of the supracrestal gingival area should be developed, and the predictive potential of clinical parameters on tissue thickness should be verified.

scholarly journals An Analysis of The Relationship between The Maxillary Molars and The maxillary sinus floor in Adult Patient Using Cone-beam Computed Tomography

2020 ◽  
Author(s):  
Lin Li ◽  
Yifan Fu ◽  
Shihui Huang ◽  
Ziya Lai ◽  
Jianping Ge
Keyword(s):  
Computed Tomography ◽  
Maxillary Sinus ◽  
Cone Beam Computed Tomography ◽  
Alveolar Bone ◽  
Third Molar ◽  
Cone Beam ◽  
Maxillary Molars ◽  
Bone Width ◽  
Internal Angle ◽  
Vertical Relationship

Abstract Background The aim of the study was to evaluate the anatomical relationship between the maxillary molars and the maxillary sinus by using cone beam computed tomography (CBCT). Methods A database of maxillary molars were obtained from 91 adult patients by means of images of CBCT. The internal angle, the alveolar bone width, and the distance between root apex and the wall of maxillary sinus were measured by CBCT. The vertical relationship between the maxillary molars and the maxillary sinus were analysed. Vertical relationship of the maxillary sinus was further evaluated. Results The value of the internal angle of maxillary third molar is 17.2 ± 11.5°. The width of the alveolar bone of third molar is 8.2 ± 1.7mm. Type III, IV and V were the most common relationship in the first and second molars. Type V and I were most frequently observed in the first and second molars. The inner angle of the second molar is larger than that of the first molar. The maxillary first molar had the smallest mean alveolar bone width, and the third molar had the largest average. Conclusion This study will provide reference for clinical practice, especially for root canal treatment and tooth implants.

scholarly journals Association between Periodontal Status and Degree of Maxillary Sinus Mucosal Thickening: a Retrospective CBCT Study

2021 ◽  
Author(s):  
Tianyi Zhang ◽  
Zhengquan He ◽  
Huan Tian
Keyword(s):  
Regression Analysis ◽  
Maxillary Sinus ◽  
Alveolar Bone ◽  
Linear Regression Analysis ◽  
Multivariate Logistic Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Factors Affecting ◽  
Periodontal Status ◽  
Computed Tomographic ◽  
Maxillary Molars

Abstract Background: It is well known that periodontitis can stimulate thickening of the maxillary sinus mucosa, but the association between periodontitis status and the degree of maxillary sinus mucosal thickening (maxMT) has not been reported. The objectives of this study were to investigate the effect of periodontal status of maxillary molars on the degree of maxMT. Methods: Retrospective analysis of cone-beam computed tomographic (CBCT) images of 203 periodontitis cases with maxMT. Parameters related to periodontitis in maxillary molars were measured and recorded on CBCT images. The dimension and length of the maxMT were also recorded. Multiple linear regression analysis was used to identify periodontal factors influencing the severity of maxMT, and multivariate logistic regression analysis was used to identify the odds ratio(OR) of these factors. Results: The factors affecting the degree of maxMT were mainly the amount of alveolar bone loss(ABL) and the minimum residual alveolar bone height (miniRABH). Compared to mild ABL, severe and moderate ABL were more likely to display severe maxMT. And the lower the miniRABH , the more severe the maxMT. Conclusions: The severity of periodontal status of maxillary molars can influence the degree of maxMT.

scholarly journals An Analysis of The Relationship between The Maxillary Molars and The maxillary sinus floor in Adult Patient Using Cone-beam Computed Tomography

2020 ◽  
Author(s):  
Lin Li ◽  
Yifan Fu ◽  
Shihui Huang ◽  
Ziya Lai ◽  
Jianping Ge
Keyword(s):  
Computed Tomography ◽  
Maxillary Sinus ◽  
Cone Beam Computed Tomography ◽  
Alveolar Bone ◽  
Third Molar ◽  
Cone Beam ◽  
Maxillary Molars ◽  
Bone Width ◽  
Internal Angle ◽  
Vertical Relationship

Abstract Background The aim of the study was to evaluate the anatomical relationship between the maxillary molars and the maxillary sinus by using cone beam computed tomography (CBCT). Methods A database of maxillary molars were obtained from 91 adult patients by means of images of CBCT. The internal angle, the alveolar bone width, and the distance between root apex and the wall of maxillary sinus were measured by CBCT. The vertical relationship between the maxillary molars and the maxillary sinus were analysed. Vertical relationship of the maxillary sinus was further evaluated. Results The value of the internal angle of maxillary third molar is 17.2 ± 11.5°. The width of the alveolar bone of third molar is 8.2 ± 1.7mm. Type III, IV and V were the most common relationship in the first and second molars. Type V and I were most frequently observed in the first and second molars. The inner angle of the second molar is larger than that of the first molar. The maxillary first molar had the smallest mean alveolar bone width, and the third molar had the largest average. Conclusion This study will provide reference for clinical practice, especially for root canal treatment and tooth implants.

Cone Beam CT Evaluation of Maxillary Sinus Floor and Alveolar Crest Anatomy for the Safe Placement of Implants

2020 ◽  
Vol 16 (7) ◽  
pp. 913-920
Author(s):  
Başak Kuşakçi Şeker ◽  
Kaan Orhan ◽  
Emre Şeker ◽  
Gülbahar Ustaoğlu ◽  
Oğuz Ozan ◽  
...  
Keyword(s):  
Maxillary Sinus ◽  
Alveolar Bone ◽  
Cone Beam ◽  
Alveolar Crest ◽  
Posterior Maxilla ◽  
Maxillary Sinus Floor ◽  
Sinus Floor ◽  
The Mean ◽  
Bone Height ◽  
Anterior Median

Background: Alveolar bone height in the posterior maxillary region is very important and critical for dental implant planning and placement. Objective: This study aimed to evaluate the anatomy of the maxillary sinus floor in relation to the alveolar crest and to determine variations in the vertical measurements between the maxillary sinus floor and the alveolar bone crest tip in the posterior edentulous maxilla with the use of cone beam computerized tomography. Methods: This analysis enrolled 234 retrospectively selected patients (123 males with mean age 52.95±11.74 (range 32-76 years) and 111 females with mean age 58.14±11.92 (range 32-75 years)) with edentulous posterior maxillary regions. The maxillary sinus floor was divided into three anatomical segments (anterior, median and posterior) in relation to the transverse palatine suture. The measurements were performed on 3D surface rendered volumetric images by using rotation and translation of the views. Landmarks for measurement were specified by using a cursor driven pointer. Vertical lines were marked on the cross-sectional images between the alveolar ridge and the deepest point of the maxillary sinus floor for each of the three regions. P < 0.05 was regarded as statistically significant. Results: The mean distance values between the sinus floor and the alveolar crest in the anterior, median and posterior regions were 8.74±3.97 mm, 5.37±3.23 mm and 7.06±3.28 mm, respectively. Measurements in the anterior region were found to be high in both total and gender groups compared to other regions. Also, subsinus alveolar bone heights decreased with increasing age in both genders in all three regions. Conclusion: This study emphasizes that the mean subsinus alveolar bone height is highest in the anterior segment of the edentulous posterior maxilla. These results may guide clinicians to make the decision of implant placement area and lead to less invasive alternative surgery methods for edentulous posterior segments.

scholarly journals Association between periodontal status and degree of maxillary sinus mucosal thickening: a retrospective CBCT study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Tianyi Zhang ◽  
Zhengquan He ◽  
Huan Tian
Keyword(s):  
Regression Analysis ◽  
Maxillary Sinus ◽  
Alveolar Bone ◽  
Linear Regression Analysis ◽  
Multivariate Logistic Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Periodontal Status ◽  
Computed Tomographic ◽  
Maxillary Molars ◽  
Mucosal Thickening

Abstract Background It is well known that periodontitis can stimulate thickening of the maxillary sinus mucosa, but the association between periodontitis status and the degree of maxillary sinus mucosal thickening (maxMT) has not been reported. The objectives of this study were to investigate the effect of periodontal status of maxillary molars on the degree of maxMT. Methods Retrospective analysis of cone-beam computed tomographic (CBCT) images of 203 periodontitis cases with maxMT. Parameters related to periodontitis in maxillary molars were measured and recorded on CBCT images. The dimension and length of the maxMT were also recorded. Multiple linear regression analysis was used to identify periodontal factors influencing the severity of maxMT, and multivariate logistic regression analysis was used to identify the odds ratio of these factors. Results The factors affecting the degree of maxMT were mainly the amount of alveolar bone loss (ABL) and the minimum residual alveolar bone height (miniRABH). Compared to mild ABL, severe and moderate ABL were more likely to display severe maxMT. And the lower the miniRABH, the more severe the maxMT. Conclusions The severity of periodontal status of maxillary molars can influence the degree of maxMT.

scholarly journals Safe regions of miniscrew implantation for distalization of mandibular dentition with CBCT

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Haibo Liu ◽  
Xiaoxue Wu ◽  
Jun Tan ◽  
Xiao Li
Keyword(s):  
Computed Tomography ◽  
Neural Tube ◽  
Cone Beam Computed Tomography ◽  
Alveolar Bone ◽  
Cone Beam ◽  
Implantation Site ◽  
Bone Thickness ◽  
Second Molar ◽  
Alveolar Crest ◽  
First Choice

Abstract Background To assess the anatomy of the mandibular buccal shelf (MBS) with cone-beam computed tomography (CBCT) and to identify the region of miniscrew implantation for the distalization of mandibular dentition. Materials and methods The MBS was assessed in 80 patients at four regions as follows: (i) between the buccal root of the mandibular second premolar and the mesiobuccal root of the first molar (L5b–L6mb), (ii) between the mesiodistal root of the first molar (L6mb–L6db), (iii) between the distobuccal root of the first molar and the mesiobuccal root of the second molar (L6db–L7mb), and (iv) between the mesiodistal roots of the second molar (L7mb–L7db). The buccal alveolar bone thickness, the narrowest inter-radicular space at the buccal side of the roots, and the distance between the implantation site and the mandibular neural tube were measured at horizontal planes of 3, 5, 7, and 9 mm from the alveolar crest. Results The buccal alveolar bone thickness increased from the premolar to the molar and from the crest edge to the mandibular roots. The L7mb–L7db region had the thickest buccal alveolar bone of 7.61 mm at a plane of 9 mm. The buccal inter-radicular spaces were smallest in the L7mb–L7db region and greatest in the L6db–L7mb region. The distances from the implantation site to the mandibular neural tube at planes of 3, 5, 7, and 9 mm were all > 13 mm from the L6 region to the L7 region. Conclusions The L6db–L7mb region should be the first choice for miniscrew implantation in the MBS for the distalization of mandibular dentition.

scholarly journals Evaluation of maxillary buccal alveolar bone before and after orthodontic alignment without extractions: A cone beam computed tomographic study

2018 ◽  
Vol 88 (6) ◽  
pp. 748-756 ◽  
Author(s):  
Juliana F. Morais ◽  
Birte Melsen ◽  
Karina M. S. de Freitas ◽  
Nuria Castello Branco ◽  
Daniela G. Garib ◽  
...  
Keyword(s):  
Risk Factors ◽  
Bone Loss ◽  
Alveolar Bone ◽  
Cone Beam ◽  
Bone Thickness ◽  
Computed Tomographic ◽  
Alveolar Crest ◽  
Before And After ◽  
Bone Changes

ABSTRACT Objectives: To assess the changes in the maxillary buccal alveolar bone during alignment without extractions. Secondarily, to evaluate the changes in arch dimensions and buccolingual inclinations of teeth and to identify risk factors for bone loss. Materials and Methods: Twenty-two adolescents with crowded permanent dentitions were treated without extractions with Damon 3MX brackets. Cone beam computed tomographic scans were taken before treatment (T0) and after alignment (T1). Bone thickness (BT) and height from the cementoenamel junction to the alveolar crest (BH) were evaluated at the maxillary central incisors, second premolars, and buccal roots of first molars. Changes in all variables from T0 to T1 were assessed. Correlations between bone changes and initial bone thickness, initial arch widths, initial crowding, amount of expansion, amount of tipping, and amount of molar rotation were calculated. Results: BT decreased and BH increased significantly for the incisors and mesiobuccal root of the first molars. Arch dimensions generally increased together with tipping. Bone loss was correlated with crowding and amount of expansion in the premolar region. Initially thinner BT was correlated with greater apical migration of bone for the incisors. Conclusions: Nonextraction alignment with self-ligating brackets led to arch expansion associated with tipping of teeth. Expansion related to alignment resulted in horizontal and vertical bone loss at the incisors and mesiobuccal root of the first molars. Thinner BTs and more severe crowding before treatment increased the risk for buccal bone loss.

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