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 Relationship Between the Thickness of Cortical Bone at Maxillary Mid-palatal Area and Facial Height Using CBCT

2015 ◽  
Vol 9 (1) ◽  
pp. 287-291 ◽  
Author(s):  
Masume Johari ◽  
Farzaneh Kaviani ◽  
Arman Saeedi
Keyword(s):  
Cortical Bone ◽  
Cross Sections ◽  
Cone Beam Ct ◽  
Treatment Modalities ◽  
Cortical Plate ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants ◽  
Facial Height ◽  
Incisive Foramen

Introduction : Orthodontic mini-implants have been incorporated into orthodontic treatment modalities. Adequate bone at mini-implant placement site can influence the success or failure of anchorage. The present study was to determine the thickness of cortical bone in the maxillary mid-palatal area at predetermined points for the placement of orthodontic mini-implants using Cone Beam CT technique in order to evaluate the relationship of these values with the facial height. Materials and Methods : A total of 161 patients, consisting of 63 males (39.13%) and 98 females (60.87%), were evaluated in the present study; 38% of the subjects had normal facial height, 29% had short face and 33% had long face. In order to determine which patient belongs to which facial height category, i.e. normal, long or short, two angular and linear evaluations were used: the angle between S-N and Go-Me lines and the S-Go/N-Me ratio. Twenty points were evaluated in all the samples. First the incisive foramen was located. The paracoronal cross-sections were prepared at distances of 4, 8, 16 and 24 mm from the distal wall of the incisive foramen and on each cross-section the mid-sagittal and para-sagittal areas were determined bilaterally at 3- and 6-mm distances (a total of 5 points). The thicknesses of the cortical plate of bone were determined at the predetermined points. Results : There was a significant relationship between the mean cortical bone thickness and facial height (p<0.01), with significantly less thickness in long faces compared to short faces. However, the thickness of cortical bone in normal faces was similar to that in long and short faces. Separate evaluation of the points showed that at point a16 subjects with short faces had thicker cortical bone compared to subjects with long and normal faces. At point b8 in long faces, the thickness of the cortical bone was significantly less than that in short and normal faces. At point d8, the thickness of the cortical bone in subjects with short faces was significantly higher than that in subjects with long faces. Conclusion : At the point a16 the cortical bone thickness in short faces was significantly higher than normal and long faces. The lower thickness of the cortical bone in the palatal area at points b8 and d8 in subjects with long faces might indicate a lower anchorage value of these points in these subjects.

scholarly journals Bone Density and Cortical Thickness in Normal, Osteopenic, and Osteoporotic Sacra

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Andrew M. Richards ◽  
Nathan W. Coleman ◽  
Trevor A. Knight ◽  
Stephen M. Belkoff ◽  
Simon C. Mears
Keyword(s):  
Bone Density ◽  
Cortical Bone ◽  
Cortical Thickness ◽  
Cancellous Bone ◽  
Quantitative Computed Tomography ◽  
Insufficiency Fractures ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Local Reduction ◽  
Sacral Insufficiency Fractures

It is unclear if a decrease in cancellous bone density or cortical bone thickness is related to sacral insufficiency fractures. We hypothesized that reduction in overall bone density leads to local reductions in bone density and cortical thickness in cadaveric sacra that match clinically observed fracture patterns in patients with sacral insufficiency fractures. We used quantitative computed tomography to measure cancellous density and cortical thickness in multiple areas of normal, osteopenic, and osteoporotic sacra. Cancellous bone density was significantly lower in osteoporotic specimens in the central and anterior regions of the sacral ala compared with other regions of these specimens. Cortical thickness decreased uniformly in all regions of osteopenic and osteoporotic specimens. These results support our hypothesis that areas of the sacrum where sacral insufficiency fractures often occur have significantly larger decreases in cancellous bone density; however, they do not support the hypothesis that these areas have local reduction of cortical bone thickness.

scholarly journals Bone and cortical bone thickness of mandibular buccal shelf for mini-screw insertion in adults

2017 ◽  
Vol 87 (5) ◽  
pp. 745-751 ◽  
Author(s):  
Riccardo Nucera ◽  
Antonino Lo Giudice ◽  
Angela Mirea Bellocchio ◽  
Paola Spinuzza ◽  
Alberto Caprioglio ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Insertion Site ◽  
Qualitative Evaluation ◽  
Insertion Torque ◽  
Bone Thickness ◽  
Second Molar ◽  
Screw Insertion ◽  
Cortical Bone Thickness ◽  
Mandibular Second Molar ◽  
Average Bone

ABSTRACT Objective: To analyze the buccal bone thickness, bone depth, and cortical bone depth of the mandibular buccal shelf (MBS) to determine the most suitable sites of the MBS for mini-screw insertion. Materials and Methods: The sample included cone-beam computed tomographic (CBCT) records of 30 adult subjects (mean age 30.9 ± 7.0 years) evaluated retrospectively. All CBCT examinations were performed with the i-CAT CBCT scanner. Each exam was converted into DICOM format and processed with OsiriX Medical Imaging software. Proper view sections of the MBS were obtained for quantitative and qualitative evaluation of bone characteristics. Results: Mesial and distal second molar root scan sections showed enough buccal bone for mini-screw insertion. The evaluation of bone depth was performed at 4 and 6 mm buccally to the cementoenamel junction. The mesial root of the mandibular second molar at 4 and 6 mm showed average bone depths of 18.51 mm and 14.14 mm, respectively. The distal root of the mandibular second molar showed average bone depths of 19.91 mm and 16.5 mm, respectively. All sites showed cortical bone depth thickness greater than 2 mm. Conclusions: Specific sites of the MBS offer enough bone quantity and adequate bone quality for mini-screw insertion. The insertion site with the optimal anatomic characteristics is the buccal bone corresponding to the distal root of second molar, with screw insertion 4 mm buccal to the cementoenamel junction. Considering the cortical bone thickness of optimal insertion sites, pre-drilling is always recommended in order to avoid high insertion torque.

scholarly journals Insertion torque, pull-out strength and cortical bone thickness in contact with orthodontic mini-implants at different insertion angles

2013 ◽  
Vol 35 (6) ◽  
pp. 766-771 ◽  
Author(s):  
T. M. Meira ◽  
O. M. Tanaka ◽  
M. M. Ronsani ◽  
I. T. Maruo ◽  
O. Guariza-Filho ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Insertion Torque ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants ◽  
Pull Out ◽  
Pull Out Strength

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 Effects of cortical bone thickness and trabecular bone density on primary stability of orthodontic mini-implants

2019 ◽  
Vol 14 (4) ◽  
pp. 383-388
Author(s):  
Chin-Yun Pan ◽  
Pao-Hsin Liu ◽  
Yu-Chuan Tseng ◽  
Szu-Ting Chou ◽  
Chao-Yi Wu ◽  
...  
Keyword(s):  
Bone Density ◽  
Trabecular Bone ◽  
Cortical Bone ◽  
Primary Stability ◽  
Trabecular Bone Density ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants

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 &lt; .05). ARME significantly reduced the BABH of the canines (P &lt; .01) and the first and second premolars (P &lt; .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.

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