Cone beam computed tomographic analysis of the spatial limitation during mandibular arch distalization

Abstract Background: In the literature, attempts are seldom made to quantify spatial limitation during mandibular arch distalization. This study aimed to investigate the spatial limitations associated with cortical contact with the mandibular second molar during mandibular arch distalization. Methods: The study population included 67 individuals who had undergone cone beam computed tomography (CBCT) (34 male and 33 female; mean age: 23.9 ± 2.72 years). The total ridge width, alveolar housing width, and root width were measured to evaluate the buccolingual limit. The space distal to the molar root represented the mesiodistal limit. The influence of sex, right versus left side, root-contact condition, malocclusion category, and presence of wisdom teeth were evaluated. Results: The rate of cortical contact was 49.3% before any orthodontic movement. No significant differences were observed in the alveolar width according to sex (male vs female), side assessed (right vs left), wisdom teeth (present vs absent), or malocclusion category. The ridge width and the alveolar width were smaller in the contact group than in the non-contact group ( P < 0.01). The group with wisdom teeth showed a larger available distalization distance, but a significant difference was observed only near the alveolar crest. Conclusions: Both ridge width and available distalization distance were limiting factors for mandibular teeth distalization. For cases in which whole-arch distalization is planned, CBCT is recommended before treatment, especially for non-extraction treatment. This approach ensures safe and predictable tooth movement.

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Cone beam computed tomographic analysis of the spatial limitation during mandibular arch distalization

10.21203/rs.2.21371/v2 ◽

2020 ◽

Author(s):

Chia-Ling Chen ◽

Chia-Hui Chen ◽

Chin-Yun Pan ◽

Hong-Po Chang ◽

Ping-Ho Chen ◽

...

Keyword(s):

Tooth Movement ◽

Limiting Factors ◽

Cone Beam ◽

Second Molar ◽

Mandibular Arch ◽

Contact Group ◽

Significant Difference ◽

Wisdom Teeth ◽

Ridge Width ◽

Spatial Limitation

Abstract Background: In the literature, attempts are seldom made to quantify spatial limitation during mandibular arch distalization. This study aimed to investigate the spatial limitations associated with cortical contact with the mandibular second molar during mandibular arch distalization. Methods: The study population included 67 individuals who had undergone cone beam computed tomography (CBCT) (34 male and 33 female; mean age: 23.9 ± 2.72 years). The total ridge width, alveolar housing width, and root width were measured to evaluate the buccolingual limit. The space distal to the molar root represented the mesiodistal limit. The influence of sex, right versus left side, root-contact condition, malocclusion category, and presence of wisdom teeth were evaluated. Results: The rate of cortical contact was 49.3% before any orthodontic movement. No significant differences were observed in the alveolar width according to sex (male vs female), side assessed (right vs left), wisdom teeth (present vs absent), or malocclusion category. The ridge width and the alveolar width were smaller in the contact group than in the non-contact group (P < 0.01). The group with wisdom teeth showed a larger available distalization distance, but a significant difference was observed only near the alveolar crest. Conclusions: Both ridge width and available distalization distance were limiting factors for mandibular teeth distalization. For cases in which whole-arch distalization is planned, CBCT is recommended before treatment, especially for non-extraction treatment. This approach ensures safe and predictable tooth movement.

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Cone beam computed tomographic analysis of the spatial limitation during mandibular arch distalization

10.21203/rs.2.21371/v1 ◽

2020 ◽

Author(s):

Chia-Ling Chen ◽

Chia-Hui Chen ◽

Chin-Yun Pan ◽

Hong-Po Chang ◽

Ping-Ho Chen ◽

...

Keyword(s):

Tooth Movement ◽

Limiting Factors ◽

Cone Beam ◽

Second Molar ◽

Mandibular Arch ◽

Contact Group ◽

Significant Difference ◽

Wisdom Teeth ◽

Ridge Width ◽

Spatial Limitation

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A 3-D evaluation of transverse dentoalveolar changes and maxillary first molar root length after rapid or slow maxillary expansion in children

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.24.3.079-087.oar ◽

2019 ◽

Vol 24 (3) ◽

pp. 79-87 ◽

Cited By ~ 1

Author(s):

Helder Baldi Jacob ◽

Gerson Luiz Ulema Ribeiro ◽

Jeryl D. English ◽

Juliana da Silva Pereira ◽

Mauricio Brunetto

Keyword(s):

Root Length ◽

Root Formation ◽

Tooth Movement ◽

Root Resorption ◽

Root Apex ◽

Cone Beam ◽

Maxillary Expansion ◽

Bone Thickness ◽

Significant Difference ◽

Bone Changes

ABSTRACT Objective: The objective of the present study was to conduct a randomized clinical trial comparing the effects of rapid maxillary expansion (RME) and slow maxillary expansion (SME). Maxillary permanent first molar root length and tooth movement through the alveolus were studied using cone-beam computed tomography (CBCT). Methods: Subjects with maxillary transverse deficiencies between 7 and 10 years of age were included. Using Haas-type expanders, children were randomly assigned to two groups: RME (19 subjects, mean age of 8.60 years) and SME (13 subjects, mean age of 8.70 years). Results: Buccal cortical, buccal bone thicknesses and dentoalveolar width decreased in both groups. In the RME group the greatest decrease was related to distal bone thickness (1.26 mm), followed by mesial bone thickness (1.09 mm), alveolar width (0.57 mm), and the buccal cortical (0.19 mm). In the SME group the mesial bone thickness decreased the most (0.87 mm) and the buccal cortical decreased the least (0.22 mm). The lingual bone thickness increased in the RME and SME groups (0.56 mm and 0.42 mm, respectively). The mesial root significantly increased in the RME group (0.52 mm) and in the SME group (0.40 mm), possibly due to incomplete root apex formation at T1 (prior to installation of expanders). Conclusions: Maxillary expansion (RME and SME) does not interrupt root formation neither shows first molar apical root resorption in juvenile patients. Although slightly larger in the RME group than SME group, both activation protocols showed similar buccal bone thickness and lingual bone thickness changes, without significant difference; and RME presented similar buccal cortical bone changes to SME.

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Prevalence of Root Canal Configuration of Mandibular Second Molar Using Cone-Beam Computed Tomography in a Sample of Iraqi Patients

Polytechnic Journal ◽

10.25156/ptj.v11n1y2021.pp22-26 ◽

2021 ◽

Vol 11 (1) ◽

pp. 22-26

Author(s):

Hiwa S. Khidir ◽

Saud J. Dizayee ◽

Sangar H. Ali

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Root Canal ◽

Root Resorption ◽

Cone Beam ◽

Inclusion Criteria ◽

Posterior Teeth ◽

Second Molar ◽

Significant Difference ◽

Mandibular Second Molar

Introduction: The purpose of this study was to find out the prevalence of C-shaped canals configurations in mandibular 2nd molar and to investigate the gender prevalence. Materials and Methods: A sample of 1200 patients’ cone beam computed tomography (CBCT) scans were screened and evaluated by a maxillofacial radiologist assessed the axial, sagittal, and coronal sections. Inclusion criteria applied to 801 patients (452 females and 349 male) aged 14–75 years were included in this study with total of 1567 mandibular 2nd molar was evaluated. Inclusion criteria: Available CBCT images of mandibular posterior teeth with at least one mandibular 2nd molar in the scan, absence of root canal treatment, absence of coronal or post coronal restorations, absence of root resorption or periapical lesions, and high-quality images. Canal configuration was classified by criteria’s which described by Fan et al. (2004): (i) Fused roots, (ii) a longitudinal groove on the buccal or lingual surface of the root, and (iii) at least one cross-section of the canal belongs to the C1, C2, or C3 configuration. Results: Considering 801 patients, 97 (12.1%) patients females 57 (7.1%) and 40 (5%) males had a C-shaped canal with no statistical difference between females and males (P > 0.05). Conclusion: The occurrence of C- shaped canal mandibular 2nd molar is approximately 12.1% and no significant difference was found by gender.

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Morphometric study of the adult maxillary sinus using cone beam computed tomography

Proceedings of the National Academy of Sciences of Belarus Medical series ◽

10.29235/1814-6023-2021-18-1-7-15 ◽

2021 ◽

Vol 18 (1) ◽

pp. 7-15

Author(s):

S. L. Kabak ◽

N. A. Savrasova ◽

Yu. M. Melnichenko ◽

N. V. Zhuravleva ◽

R. S. Mekhtiev

Keyword(s):

Computed Tomography ◽

Maxillary Sinus ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Morphometric Study ◽

Posterior Teeth ◽

Second Molar ◽

Maxillary Sinus Volume ◽

Linear Dimensions ◽

Significant Difference

The aim of the study was to determine the range of maxillary sinus volume and linear dimensions in adults, taking into account the gender and the side of the location using cone-beam computed tomography (CBCT) images.This study used the CBCT images of 136 patients (263 maxillary sinuses), who were presented to Minsk health facilities, with dental and maxillary sinus pathologies, aged over 20 years with no history of upper jaw surgery and with the presence of upper posterior teeth (from the first premolar to the second molar inclusive). The height, depth and width of the sinus weremeasured manually on CBCT scans. The maxillary sinus volume (V) was calculated by the formula: V = height × depth × 1/3 width.The volume of the maxillary sinus was varied from 5.53 to 24.03 cm3. The mean values of the sinus width, height and depth were 27.13 ± 3.83 mm, 35.83 ± 4.36 mm, and 38.98 ± 3.38 mm respectively.Despite a high variability of the maxillary sinus volume values, we did not find a statistically significant difference between the right and left sides in both males and females. The maxillary sinus linear dimensions and volume in females were statistically significantly less than in males.

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Mandibular Buccal Bone Thickness In Southeastern Anatolian People: A Cone-Beam Computed Tomography Study

International Dental Research ◽

10.5577/intdentres.2017.vol7.no1.2 ◽

2017 ◽

Vol 7 (1) ◽

pp. 6 ◽

Cited By ~ 3

Author(s):

Ceren Aktuna Belgin ◽

Ozkan Adiguzel ◽

Marius Bud ◽

Mehmet Colak ◽

Zeki Akkus

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Age Groups ◽

Cone Beam ◽

Bone Thickness ◽

Posterior Teeth ◽

Second Molar ◽

Significant Difference ◽

Molar Teeth ◽

The Difference

Aim: Buccal bone thickness is an important factor in implant treatment, bone health after tooth extraction, apical surgery, and esthetic outcomes. We evaluated the distance from the mandibular premolar and molar teeth apices to the buccal cortical bone in southeastern Anatolian people using cone-beam computed tomography (CBCT). Methodology: This retrospective study was performed in 461 posterior teeth (220 premolars, 241 molars) of 133 patients (62 females, 64 males) at Dicle University, Faculty of Dentistry, Department of Oral and Maxillofacial Radiology. Data were analyzed using Student’s t-tests and Tukey HSD tests. Results: The mandibular buccal bone was thicker in men than in women, but the difference was not statistically significant (p>0.05). The thinnest point of the mandibular buccal bone was measured in women as 2.431 mm and in men as 2.491 mm in the first premolar teeth. The thickest point of the mandibular bone was measured in women as 7.940 mm and in men as 7.859 mm in the distal roots of mandibular second molar teeth. For the mandibular first and second premolars, there was no significant difference in buccal bone thickness among the 10–29-, 30–49-, and 50–69-year age groups. The difference between the first and second molar mesial and distal roots of the age groups was significant at the level of buccal root thickness (p<0.05). Conclusions: It is important to examine buccal bone thickness (with CBCT) before surgical dental procedures for appropriate implant planning and surgical endodontic treatment. How to cite this article: Aktuna Belgin C, Adiguzel O, Bud M, Colak M, Akkus Z. Mandibular Buccal Bone Thickness In Southeastern Anatolian People: A Cone-Beam Computed Tomography Study. Int Dent Res 2017;7:6-12. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Cone beam computed tomographic analysis of the spatial limitation during mandibular arch distalization

BMC Medical Imaging ◽

10.1186/s12880-020-00441-y ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Chia-Ling Chen ◽

Chia-Hui Chen ◽

Chin-Yun Pan ◽

Hong-Po Chang ◽

Ping-Ho Chen ◽

...

Keyword(s):

Cone Beam ◽

Mandibular Arch ◽

Computed Tomographic ◽

Tomographic Analysis ◽

Spatial Limitation

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Axial Triangle of the Maxillary Sinus, and its Surgical Implication With the Position of Maxillary Sinus Septa During Sinus Floor Elevation: A CBCT Analysis

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-18-00229 ◽

2020 ◽

Vol 46 (4) ◽

pp. 415-422

Author(s):

Junho Jung ◽

Jung Soo Park ◽

Seoung-Jin Hong ◽

Gyu-Tae Kim ◽

Yong-Dae Kwon

Keyword(s):

Maxillary Sinus ◽

Surgical Techniques ◽

Lateral Sinus ◽

Sinus Floor Elevation ◽

Second Molar ◽

Sinus Wall ◽

Posterior Maxilla ◽

Significant Difference ◽

Sinus Floor ◽

Molar Region

The aim of this study was to measure the convexity of the lateral wall of the maxillary (Mx) sinus and identify the locational distribution of antral septa in relation to the zygomaticomaxillary buttress (ZMB), in order to suggest another anatomical consideration and surgical modification of sinus floor elevation procedures. This study was designed as a cross-sectional study, and a total of 134 patients and 161 sinuses containing edentulous alveolar ridges were analyzed. The angle between the anterior and lateral walls of the Mx sinus (lateral sinus angle [LSA]), and the angle between the midpalatal line and the anterior sinus wall (anterior sinus angle [ASA]) were measured. Mean LSAs and ASAs were 105.9° ± 9.86° and 58.4° ± 6.43°, respectively. No significant difference between left and right sides was found (LSA, P = .420; right = 105.5° ± 9.27°; left = 105.5° ± 9.27° and ASA, P = .564; right = 57.9° ± 6.80°; left = 58.8° ± 6.02°). The prevalence of septa was 37.3%, and it was most frequently noted in the second molar region (32.8%), followed by the first molar (20.9%), retromolar (16.4%), and second premolar regions (14.9%). Septa were most frequently located posterior to the ZMB (49.2%), while ZMB was mostly located in the first molar region (66.4%). Narrow LSAs may complicate the surgical approach to the posterior maxilla, especially when sinus elevation should be used in the second molar region. Considering the occasional presence of antral septa, membrane elevation may be complicated when a septum is encountered during the procedure. These results suggest that 3-dimensional examination of the convexity of the Mx sinus should be performed preoperatively to choose proper surgical techniques and minimize surgical complications.

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A STUDY OF CONDYLAR POSITION IN CENTRIC RELATION AND MAXIMAL INTERCUSPATION USING CONEBEAM TOMOGRAPHY

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2019.2.14 ◽

2019 ◽

pp. 84-92

Author(s):

Anh Chi Phan ◽

Xuan Anh Ngoc Ho

Keyword(s):

Dental Students ◽

Cone Beam ◽

Test Results ◽

Reference Position ◽

Centric Relation ◽

Temporomandibular Joints ◽

Significant Difference ◽

Mandibular Fossa ◽

Condylar Position ◽

Cone Beam Tomography

Background: The condylar position discrepancy between centric relation and maximal intercuspation has been still a controversial issue. Aims: To compare the condylar position between centric relation and maximal intercuspation using cone-beam tomography in patients without temporomandibular joints disorder. Materials and methods: To assess the condylar position in centric relation and maximal intercuspation using cone-beam tomography on 40 fifth-year and sixth-year dental students of Hue University of Medicine and Pharmacy without temporomandibular joints disorder. The condylar positions are assessed following Sener classification (2009) and are compared between centric relation and maximal intercuspation using pairedsamples t-test and Mann-Whitney U-test. Results: Among 480 condye-to-fossa measurement pairs, there are 91.2% pairs having difference between two reference position but there is no significant difference. The condylar position at the superior of mandibular fossa has the greatest percentage in both centric relation and maximal intercuspation (43.8% in centric relation and 51.2% in maximal intercuspation). This greatest percentage is followed by the condylar position at posterior of mandibular fossa (32.5% in centric relation and 36.3% in maximal intercuspation). Lastly, the condylar position at the anterior of mandibular fossa has the fewest percentage (23.7% in centric relation and 12.5% in maximal intercuspation). Conclusion: There is no significant difference of condylar position between centric relation and maximal intercuspation in patients without temporomandibular joints disorder. Key words: Condylar position, centric relation, maximal intercuspation, cone-beam tomography

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Two Adhesive Systems-effect on Adhesion to Tooth Structure

Revista de Chimie ◽

10.37358/rc.19.7.7389 ◽

2019 ◽

Vol 70 (7) ◽

pp. 2608-2613

Author(s):

Larisa Simona Deac ◽

Kamel Earar ◽

Adela Loredana Colceriu Burtea ◽

Alexandra Stefania Berghe ◽

Aurora Antoniac ◽

...

Keyword(s):

Adhesive Systems ◽

Hybrid Layer ◽

Tooth Structure ◽

Selective Etch ◽

Etch And Rinse ◽

Significant Difference ◽

Wisdom Teeth ◽

Group 2 ◽

Self Etch ◽

Group 1

This study evaluates and compares by dye penetration method and SEM photomicrographs the sealing obtained using two different classes of adhesive systems (etch-and-rinse and self-etch with selective etching) with SDR (Dentsply) bulk fill composite. 84 class V cavities were prepared on oral and vestibular face of 42 intact, freshly extracted wisdom teeth. The cavities were randomly divided in two groups and restored: Group 1 with prime &bond one select (Dentsply) and SDR (Dentsply) and Group 2 with prime&bond one Etch&Rinse (Dentsply) and SDR (Dentsply). Prime&bond one Select (Dentsply) is a single component adhesive and can be used in self etch mode, in selective enamel etch mode, or in etch-and-rinse mode. We chosen for this study the selective etch of the enamel mode. Prime&bond one Etch Rinse (Dentsply) is a universal etch-and-rinse one-bottle dental adhesive, designed to be used in two steps. The bulk fill composites are commonly used in modern dentistry due to their properties of low polymerization shrinkage and curing in layer of 4 mm depth, offering the practitioner a fast clinical procedure with good results. The results showed a good sealing at enamel and dentin margins with no statistically significant difference between adhesives, even though the mean of enamel infiltration was smaller for Group1. Furthermore the results show that there were differences between the two groups, for the infiltrations at the enamel, the values of microleakage being arithmetically higher for Group 1, but with no statistically difference between the two groups.SEM images showed for both groups a good adhesion surface with the tooth, but the hybrid layer of the total-etch adhesives is different from the hybrid layer formed by self etch adhesives, in terms of thickness, uniformity. In conclusion both adhesive systems have equivalent sealing qualities and can be successfully used with SDR.

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