scholarly journals Palatal Bone Thickness of MSE Implantation area in Adult Patients with Skeletal Class Ⅲ Malocclusion: A Cone-beam Computed Tomographic Study

2021 ◽  
Author(s):  
Weiting Chen ◽  
Kaili Zhang ◽  
Dongxu Liu
Keyword(s):  
Inferior Turbinate ◽  
Adult Patients ◽  
Cone Beam ◽  
Bone Thickness ◽  
Female Ratio ◽  
Skeletal Class ◽  
Computed Tomographic ◽  
Significant Difference ◽  
The Difference ◽  
Palatal Bone

Abstract Background: Analyze the palatal bone thickness of maxillary skeletal expander (MSE) implantation area in adult patients with skeletal class Ⅲ malocclusion based on Cone-beam computed tomography (CBCT) data, and to provide a reference for the implantation of the miniscrew.Methods: A total of 80 adult patients (40 M, 40 F) with an normal angle before treatment were divided into two groups; skeletal class Ⅲ malocclusion group and skeletal Ⅰ malocclusion group according to sagittal facial type, with 40 patients in each group, with a male to female ratio of 1: 1. CBCT scanner was used to obtain DICOM data from all patients.The palatal bone thickness was measured at 45 sites with MIMICS 21.0 and SPSS 22.0 was employed for statistical analysis. The bone thickness of different regions of the palate in the same group was analyzed by one-way analysis of variance (ANOVA) method; Fisher’s least significant difference (LSD)-t method was used for comparison in pairs, and an independent sample t-test was employed to test the difference of bone thickness in the same area between the two groups.Results: (1) There was no significant difference among the anterior, middle, and posterior regions of the midline area in patients with skeletal class Ⅲ malocclusion (P > 0.05). Palatal bone thickness decreased gradually from front to back in the middle and lateral areas in both groups (P < 0.001). (2) The bone thickness of the anterior, middle, and posterior regions of the two groups gradually decreased from the middle area to the parapalatine region. (3) The palatal bone were significant thinner in the area 9.0 mm before the transverse palatine suture in midline area, 9.0 mm before and after the transverse palatine suture in the middle area, and 9.0 mm after the transverse palatine suture in the lateral area.Conclusion: (1) The palatal bone of patients with class Ⅲ malocclusion was thinner in some areas, so the MSE implant anchorage position could be moved forward appropriately. (2) The thin palatal bone increased the risk of MSE anchorage screw penetrating nasal mucosa and even inferior turbinate. Patients should be given a more precise and personalized implantation scheme based on factors such as palatine bone thickness and palatal morphology.

scholarly journals Palatal bone thickness at the implantation area of maxillary skeletal expander in adult patients with skeletal Class III malocclusion: a cone-beam computed tomography study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Weiting Chen ◽  
Kaili Zhang ◽  
Dongxu Liu
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Adult Patients ◽  
Cone Beam ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Bone Thickness ◽  
Skeletal Class ◽  
Significant Difference ◽  
Palatal Bone

Abstract Background Maxillary skeletal expanders (MSE) is effective for the treatment of maxillary transverse deformity. The purpose of the study was to analyse the palatal bone thickness in the of MSE implantation in patients with skeletal class III malocclusion. Methods A total of 80 adult patients (40 males, 40 females) with an average angle before treatment were divided into two groups, the skeletal class III malocclusion group and the skeletal I malocclusion group, based on sagittal facial type. Each group consisted of 40 patients, with a male to female ratio of 1:1. A cone-beam computed tomography scanner was employed to obtain DICOM data for all patients. The palatal bone thickness was measured at 45 sites with MIMICS 21.0 software, and SPSS 22.0 software was employed for statistical analysis. The bone thickness at different regions of the palate in the same group was analysed with one-way repeated measures ANOVA. Fisher’s least significant difference-t method was used for the comparison of pairs, and independent sample t test was employed to determine the significance of differences in the bone thickness at the same sites between the two groups. Results Palatal bone thickness was greater in the middle region of the midline area (P < 0.01), while the thickness in the middle and lateral areas in both groups was generally lower (P < 0.001). The bone in the anterior, middle, and posterior regions of the two groups became increasingly thin from the middle area toward the parapalatine region. The palatal bone was significantly thinner in the area 9.0 mm before the transverse palatine suture in the midline area, 9.0 mm before and after the transverse palatine suture in the middle area, and 9.0 mm after the transverse palatine suture in the lateral area. Conclusion The palatal bone was thinner in patients with class III malocclusion than in patients with class I malocclusion, with significant differences in some areas. The differences in bone thickness should be considered when MSE miniscrews are implanted. The anterior and middle palatal areas are safer for the implantation of miniscrews, while the thinness of the posterior palatal bone increases the risk of the miniscrews falling off and perforating.

scholarly journals PREVALENCE OF MANDIBULAR ASYMMETRY IN SKELETAL CLASS I ADULT PATIENTS

2014 ◽  
Vol 2 (2) ◽  
pp. 189 ◽  
Author(s):  
Bruno Frazão Gribel ◽  
Guilherme Thiesen ◽  
Tássia Silvana Borges ◽  
Maria Perpétua Mota Freitas
Keyword(s):  
Computed Tomography ◽  
Calculation Method ◽  
Significant Error ◽  
Adult Patients ◽  
Class I ◽  
Cone Beam ◽  
Skeletal Class ◽  
Mandibular Asymmetry ◽  
Computed Tomography Images ◽  
Significant Difference

AIM: The objective of this study was evaluating the prevalence of mandibular asymmetry in skeletal Class I adult patients. MATERIALS AND METHODS: The sample was composed by cone-beam computed tomography images of 250 skeletal Class I patients with age from 18 to 70 years old. The side deviation of mandibular asymmetry was evaluated (right and left), as well as the intensity of this asymmetry. People with gnathic deviation until 2mm were considered as patients with slight asymmetry; deviation between 2 and 5mm was considered moderate asymmetry and those higher than 5mm as severe asymmetries. The error calculation method was performed and there was not significant error in the measurements. To verify the association between the prevalence of mandibular asymmetry and the gender of individuals, the Χ2 was carried out and the significant level adopted was 5% (p<0.05). RESULTS: The results showed that mandibular deviation occurred more frequently to the left side in both genders (male 56.5% e female 58.2%), without statistically significant difference between them (p=0.792). Besides, the prevalence of slight, moderate and severe asymmetries were, respectively 61%, 27% and 12% for males and 54%, 28% and 18% for female; and there was not statistically significant difference (p=0.366) between the gender of the sample evaluated. CONCLUSION: In this study, both deviation and intensity of mandibular asymmetry did not present preference regarding to the gender.

scholarly journals Quantitative evaluation of palatal bone thickness to guide miniscrews insertion: a CBCT assessment

HU Revista ◽  
2020 ◽  
Vol 46 ◽  
pp. 1-8
Author(s):  
Rodrigo César Santiago ◽  
Carolina De Sá Werneck ◽  
Fernanda Ramos de Faria ◽  
Robert Willer Farinazzo Vitral ◽  
Marcio José Da Silva Campos
Keyword(s):  
Anterior Part ◽  
Regions Of Interest ◽  
Cone Beam ◽  
Bone Thickness ◽  
Computed Tomographic ◽  
Mini Implants ◽  
Incisive Foramen ◽  
The Mean ◽  
Palatal Bone ◽  
A Site

Introduction: The use of mini-implants has become common in orthodontic practice as it has increased the possibility of skeletal anchorage. The palate constitutes a site of choice for the insertion of miniscrews purposes because it is a site with relatively safety with appropriate bone thickness and less suitability for inflammation. Aim: To quantitatively evaluate the thickness of the palatal bone for miniscrews insertion. Material and Methods: Forty-seven sets of cone beam computed tomographic (CBCT) images were selected. The sample consisted of cone beam computed tomography from 47 patients (20 male, 27 female; mean age 22.4 years old/± 3.01 years). Palatal bone thickness (PBT) was measured in millimeters (mm) with 5 regions of interest (ROIs) which were determined used the coronal reconstructions of the patatal area: 4, 6, 8 and 10 mm posterior to the incisive foramen were evaluated. A total of 940 ROIs were evaluated. RESULTS: Significant differences were observed for PBT between various palatal sections (p<.01). The thickest area (6.31-7.03 mm) was found in the anterior part of the palate. The mean bone thicknesses in the 6, 8 and 10 mm sections were significantly less than those observed at 4 mm from the incisive foramen. Conclusions: The thickness of the palatal bone is progressively thinner from the palatine foramen to the posterior region. Transversally, the bone was thicker in the palatine suture than in paramedian areas, mainly in the coronal reconstructions located more laterally.

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

2017 ◽  
Vol 7 (1) ◽  
pp. 6 ◽  
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.

scholarly journals Height difference between the vestibular and palatal walls and palatal width: a cone beam computed tomography approach

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
P. López-Jarana ◽  
C. M. Díaz-Castro ◽  
A. Falcão ◽  
C. Falcão ◽  
J. V. Ríos-Santos ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Bone Thickness ◽  
Height Difference ◽  
Mean Values ◽  
The Mean ◽  
Maxilla And Mandible ◽  
Palatal Bone ◽  
Two Parameters

Abstract Background The objective of this study was to measure two parameters involved in tri-dimensional implant planning: the position of the buccal and palatal bone wall and the palatal thickness. Methods Cone beam computed tomography (CBCT) images (Planmeca ProMax 3D) of 403 teeth (208 upper teeth and 195 lower teeth) were obtained from 49 patients referred to the Dental School of Seville from January to December 2014. The height difference between the palatal and buccal walls was measured on the most coronal point of both walls. The thickness of the palatal wall was measured 2 mm from the most coronal point of the palatal wall. Results The mean values in the maxilla were 1.7 ± 0.9 mm for central and lateral incisors, 2.2 ± 1.7 mm for canines, 1.6 ± 0.9 mm for premolars and 1.9 ± 1.5 mm for molars. In the lower jaw, the mean values were 1.3 ± 0.8 mm for incisors, 1.7 ± 1.2 mm for canines, 2.3 ± 1.3 mm for premolars, and 2.6 ± 1.7 mm for molars. In the upper jaw, more than 55% of maxillary teeth (excluding second premolars and molars) presented mean height differences greater than 1 mm. In the mandible, more than 60% of incisors showed a buccal bone thickness of 1 mm from the apical to lingual aspect. All teeth except the second premolar presented a buccal wall located more than 1 mm more apically than the lingual bone wall. Conclusions The buccal bone wall is located more apically (greater than 1 mm) than the palatal or lingual table in most of the cases assessed. The thickness of the palatal or lingual table is also less than 2 mm in the maxilla and mandible, except in the upper canines and premolars and the lower molars.

scholarly journals Effects of rapid maxillary expansion in cleft patients resulting from the use of two different expanders

2016 ◽  
Vol 21 (6) ◽  
pp. 82-90 ◽  
Author(s):  
Daniel Santos Fonseca Figueiredo ◽  
Lucas Cardinal ◽  
Flávia Uchôa Costa Bartolomeo ◽  
Juan Martin Palomo ◽  
Martinho Campolina Rebello Horta ◽  
...  
Keyword(s):  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Tomographic Image ◽  
Maxillary Expansion ◽  
Downward Movement ◽  
Computed Tomographic ◽  
Significant Difference ◽  
Maxillary Region

ABSTRACT Objective: The aim of this study was to evaluate the skeletal and dental effects of rapid maxillary expansion (RME) in cleft patients using two types of expanders. Methods: Twenty unilateral cleft lip and palate patients were randomly divided into two groups, according to the type of expander used: (I) modified Hyrax and (II) inverted Mini-Hyrax. A pretreatment cone-beam computed tomographic image (T0) was taken as part of the initial orthodontic records and three months after RME, for bone graft planning (T1). Results: In general, there was no significant difference among groups (p > 0.05). Both showed a significant transverse maxillary expansion (p < 0.05) and no significant forward and/or downward movement of the maxilla (p > 0.05). There was greater dental crown than apical expansion. Maxillary posterior expansion tended to be larger than anterior opening (p < 0.05). Cleft and non-cleft sides were symmetrically expanded and there was no difference in dental tipping between both sides (p > 0.05). Conclusions: The appliances tested are effective in the transverse expansion of the maxilla. However, these appliances should be better indicated to cleft cases also presenting posterior transverse discrepancy, since there was greater expansion in the posterior maxillary region than in the anterior one.

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

2019 ◽  
Vol 24 (3) ◽  
pp. 79-87 ◽  
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.

Ependymomas and ependymoblastomas in children

1976 ◽  
Vol 45 (3) ◽  
pp. 273-283 ◽  
Author(s):  
George J. Dohrmann ◽  
Jacqueline R. Farwell ◽  
John T. Flannery
Keyword(s):  
Operative Mortality ◽  
Similar Frequency ◽  
Female Ratio ◽  
Content Type ◽  
Presenting Symptoms ◽  
Clinical Difference ◽  
Significant Difference ◽  
Previous Decade ◽  
Adults And Children ◽  
The Difference

✓ The authors analyze histologically verified cases of ependymoma and ependymoblastoma (malignant ependymoma) occurring in children in Connecticut from 1935 to 1973. Of the 488 central nervous system tumors diagnosed in that period, 44 (9%) of the 467 intracranial neoplasms and five (24%) of the 21 intraspinal tumors were of ependymal origin. An increase in the incidence of ependymomas was noted since the mid-1950's. The mean ages at diagnosis of ependymomas and ependymoblastomas were 5.6 and 5.0 years respectively. The male to female ratio was 0.6:1 for ependymomas and 1.7:1 for ependymoblastomas. Ependymomas were found above and below the tentorium with similar frequency; however, virtually all of the ependymoblastomas occurred supratentorially. Presenting symptoms and physical findings were reviewed. A significant difference (p < 0.05) was noted in the seizure rates of supratentorial ependymomas (9%) and ependymoblastomas (38%). A significantly increased survival (p < 0.05) was associated with supratentorial ependymal neoplasms relative to infratentorial from 42 months following diagnosis onward. Contrary to the reports of no clinical difference between ependymomas and ependymoblastomas, children with supratentorial ependymomas were noted to have a significantly longer survival (p < 0.05) than those with similarly situated ependymoblastomas, with the difference noted from 18 months following diagnosis onward. The children treated by operation and irradiation had a significantly greater survival (p < 0.05) than those treated by other methods; furthermore, with this treatment, longer survivals were noted in the ependymoma patients as compared to those with ependymoblastomas. This difference became significant (p < 0.05) at 27 months after diagnosis. Operative mortality decreased from 40% to 17% in the last decade of the study as compared to the previous decade. Steroid therapy may have contributed to this decreased operative mortality, but it had no statistically significant effect on length of survival. The clinical course of intracranial ependymal neoplasms in adults and children was compared and appeared to be essentially the same.

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