scholarly journals ASSESSMENT OF ANATOMICAL CONDITIONS FOR THE INSTALLATION OF MINISCREWS «BIORAY A1» IN THE AREA OF THE MANDIBULAR BUCCAL SHELF

2020 ◽  
Vol 75 (3) ◽  
pp. 117-119
Author(s):  
N.N. Klimova ◽  
◽  
A.V. Markova ◽  
T.N. Klimova ◽  
◽  
...  
Keyword(s):  
Bone Tissue ◽  
Orthodontic Treatment ◽  
Oblique Line ◽  
Second Molar ◽  
Distal Surface ◽  
External Oblique ◽  
The Stability ◽  
Distal Direction

Currently, miniscrews installed parallel to the roots are widely used in the practice of orthodontic treatment. When planning the placement of miniimplants, it is necessary to evaluate the anatomical factors that affect the stability of the miniscrew in the bone. For the analysis, we selected the zone of the external oblique line, where the thickness of bone tissue in the area of the first and second molars was estimated in the vertical and horizontal planes. As a result of the study, it was found that the area of the distal surface of the distal root of the second molar had the greatest thickness of bone tissue. An increase in the vestibular-oral thickness was also observed in the distal direction.

Simple bone cyst: Uncommon cyst of jaw

2020 ◽  
Vol 5 (3) ◽  
pp. 1252-1254
Author(s):  
Gopal Gurung ◽  
Laxmi Prasad Chapagain ◽  
Yagya Bahadur Rokaya
Keyword(s):  
Orthodontic Treatment ◽  
Bone Cyst ◽  
Definitive Treatment ◽  
Simple Bone Cyst ◽  
Jaw Cysts ◽  
Surgical Exploration ◽  
X Ray ◽  
Dental Examination ◽  
Distal Surface ◽  
Hollow Cavity

Simple bone cyst (SBC) of the jaws is uncommon, representing approximately 1% of all jaw cysts. It is often accidentally discovered on routine dental examination as it is asymptomatic in most of cases. In this report, we discuss a case of SBC in a 16 years old female who presented in our department for correction of her mal-aligned teeth. On routine x-ray for orthodontic treatment, a well defined, unilocular radiolucent area approximately 3x1cm in size with scalloped borders on the left body of mandible expanding from distal surface of 34 to distal surface of 37 was discovered. Surgical exploration was required for both diagnostic and definitive treatment. The operative finding was hollow cavity without any epithelial lining.

scholarly journals Nonsurgical miniscrew-assisted rapid maxillary expansion results in acceptable stability in young adults

2016 ◽  
Vol 86 (5) ◽  
pp. 713-720 ◽  
Author(s):  
Sung-Hwan Choi ◽  
Kyung-Keun Shi ◽  
Jung-Yul Cha ◽  
Young-Chel Park ◽  
Kee-Joon Lee
Keyword(s):  
Young Adults ◽  
Treatment Modality ◽  
Orthodontic Treatment ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Initial Examination ◽  
The Stability ◽  
Maxillary Deficiency ◽  
Time Point

ABSTRACT Objective:  To evaluate the stability of nonsurgical miniscrew-assisted rapid maxillary expansion (MARME) in young adults with a transverse maxillary deficiency. Materials and Methods:  From a total of 69 adult patients who underwent MARME followed by orthodontic treatment with a straight-wire appliance, 20 patients (mean age, 20.9 ± 2.9 years) with follow-up records (mean, 30.2 ± 13.2 months) after debonding were selected. Posteroanterior cephalometric records and dental casts were obtained at the initial examination (T0), immediately after MARME removal (T1), immediately after debonding (T2), and at posttreatment follow-up (T3). Results:  Suture separation was observed in 86.96% of subjects (60/69). An increase in the maxillary width (J-J; 1.92 mm) accounted for 43.34% of the total expansion with regard to the intermolar width (IMW) increase (4.43 mm; P < .001) at T2. The amounts of J-J and IMW posttreatment changes were −0.07 mm (P > .05) and −0.42 mm (P  =  .01), respectively, during retention. The postexpansion change in middle alveolus width increased with age (P < .05). The postexpansion change of interpremolar width (IPMW) was positively correlated with the amount of IPMW expansion (P < .05) but not with IMW. The changes of the clinical crown heights in the maxillary canines, first premolars, and first molars were not significant at each time point. Conclusions:  Nonsurgical MARME can be a clinically acceptable and stable treatment modality for young adults with a transverse maxillary deficiency.

scholarly journals Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

2015 ◽  
Vol 86 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Christos Livas ◽  
Nikolaos Pandis ◽  
Johan Willem Booij ◽  
Demetrios J. Halazonetis ◽  
Christos Katsaros ◽  
...  
Keyword(s):  
Private Practice ◽  
Orthodontic Treatment ◽  
Statistical Significance ◽  
Third Molar ◽  
Class Ii ◽  
Second Molar ◽  
Inclination Angles ◽  
And Gender ◽  
Extraction Treatment ◽  
Over Time

ABSTRACT Objective:  To assess the maxillary second molar (M2) and third molar (M3) inclination following orthodontic treatment of Class II subdivision malocclusion with unilateral maxillary first molar (M1) extraction. Materials and Methods:  Panoramic radiographs of 21 Class II subdivision adolescents (eight boys, 13 girls; mean age, 12.8 years; standard deviation, 1.7 years) before treatment, after treatment with extraction of one maxillary first molar and Begg appliances and after at least 1.8 years in retention were retrospectively collected from a private practice. M2 and M3 inclination angles (M2/ITP, M2/IOP, M3/ITP, M3/IOP), constructed by intertuberosity (ITP) and interorbital planes (IOP), were calculated for the extracted and nonextracted segments. Random effects regression analysis was performed to evaluate the effect on the molar angulation of extraction, time, and gender after adjusting for baseline measurements. Results:  Time and extraction status were significant predictors for M2 angulation. M2/ITP and M2/IOP decreased by 4.04 (95% confidence interval [CI]: −6.93, 1.16; P  =  .001) and 3.67 (95% CI: −6.76, −0.58; P  =  .020) in the extraction group compared to the nonextraction group after adjusting for time and gender. The adjusted analysis showed that extraction was the only predictor for M3 angulation that reached statistical significance. M3 mesial inclination increased by 7.38° (95% CI: −11.2, −3.54; P < .001) and 7.33° (95% CI: −11.48, −3.19; P  =  .001). Conclusions:  M2 and M3 uprighting significantly improved in the extraction side after orthodontic treatment with unilateral maxillary M1 extraction. There was a significant increase in mesial tipping of maxillary second molar crowns over time.

scholarly journals Molar Uprighting: A Considerable and Safe Decision to Avoid Prosthetic Treatment

2017 ◽  
Vol 11 (1) ◽  
pp. 466-475 ◽  
Author(s):  
Taísa Boamorte Raveli ◽  
Dirceu Barnabé Raveli ◽  
Kelei Cristina de Mathias Almeida ◽  
Ary dos Santos Pinto
Keyword(s):  
Orthodontic Treatment ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Female Adult ◽  
Bone Apposition ◽  
Force System ◽  
Second Molar ◽  
Space Closure ◽  
Practical Implications ◽  
Lower Molar

Background: Tipped lower molar over edentulous space is very common in orthodontics practice when adults seek treatment. The segmented arch technique features a predictable force system that provides a controlled release of force that can produce light and continuous tooth movement. Case Description: A female adult patient, who lost a permanent lower first molar, needed correction of the position of her permanent first molar place. Instead of making space for rehabilitation, it was closed after second molar uprighting and a balanced interdigitation was created without prosthetics. The patient was successfully treated with segmented arch technique using root correction spring activated with geometry VI to promote uprighting of a tipped molar and Niti spring coil to promote space closure. Practical Implications: Segmented arch technique is known to provide predictable light and continuous forces, which is very much indicated in adult treatment. There are several things to consider when orthodontically treating adult patients. Their periodontal conditions might not be ideal, less bone apposition may occur, and side effects of orthodontic tooth movement are expected. Thus, a predictable and controlled orthodontic treatment is needed.

scholarly journals COMPARATIVE ANALYSIS OF MONOCORTICAL AND BICORTICAL METHODS OF INSTALLING MINI-IMPLANTS

2021 ◽  
pp. 38-40
Author(s):  
O.Yu. Rivis ◽  
V.S. Melnyk ◽  
M.V. Rivis ◽  
K.V. Zombor
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Analysis ◽  
Cortical Bone ◽  
Bone Tissue ◽  
Orthodontic Treatment ◽  
The Finite Element Method ◽  
Force Load ◽  
Mini Implants ◽  
Element Method

The aim of the study. Carry out a comparative analysis of the support ability of human jaw bone tissue in monocortical and bicortical installation of a mini-implant of own design OMG. Research methods. In order to study biomechanical characteristics of developed OMG mini-implant and bone tissue capacity during monocortical and bicortical installation, the finite element method (MSE) was used. The scheme and finite element 2-D model of bicortical installation of OMG mini-implant (length 8 mm, diameter 1.8 mm) provided full penetration through one layer of cortical bone equal to 1 mm, the entire cancellous bone and immersion in the second layer of cortical bone by 0, 5 mm. No implantation was immersed in the second cortical layer of bone during monocortical installation. A single force load of 1 N was applied in the horizontal direction parallel to the cortical plate of the bone. Results of the study. One of the most important factors leading to the success of the use of a mini-implant is its stability in the process of orthodontic treatment. Quite a high level of failure in the monocortical installation of mini-screws has led to the search for better methods to ensure the stability of their use. This was a bicortical method of fixation, based on the placement of the minig screw in the thickness of the two cortical plates of the jaws. Area for such installation of mini-screws can be a site of a palate and alveolar sprouts at installation of miniimplants through all its thickness. As shown by our data on the use of the finite element method under the force load of the biomechanical system "bone - mini-implant", the stress concentration zone is located in the area of the cortical bone of the jaw. The results of the calculation of the maximum stresses (σmax, MPa) and the maximum possible displacements (umax, mm) of the mini-implant in the biomechanical system "bone - mini-implant" in monocortical installation were, respectively, 8.27 MPa and 0.300 * 10-8 mm and in bicortical installation 6.00 MPa and 0.201 * 10-8 mm. The bicortical method of fixing the mini-implant in the jaw bones significantly increases the ability to resist deformation of this type of biomechanical system under force loads of the mini-implant. In the bicortical method of mini-implant placement, the extreme values of equivalent according to Mises stresses in the upper part of the cortical bone of the jaw are reduced by 27%. This can be explained by a significant increase in the area of contact due to the two layers of the cortical bone of the jaw with the surface of the mini-implant. Conclusion. The bicortical method of installing mini-implants is a more effective and reliable way to provide skeletal support during orthodontic treatment.

The Effect of the Supra-alveolar Soft Tissue on the Relapse of Orthodontic Treatment

1983 ◽  
Vol 10 (1) ◽  
pp. 50-52 ◽  
Author(s):  
Erik Larsson ◽  
György Schmidt
Keyword(s):  
Soft Tissue ◽  
Connective Tissue ◽  
Orthodontic Treatment ◽  
Histological Analysis ◽  
Inflammatory Cells ◽  
Connective Tissues ◽  
Control Side ◽  
Definite Difference ◽  
The Stability

Orthodontic closure in cases of aplasia as also in patients with spaces of other genesis is often associated with problems of relapse. In this study ten patients were treated orthodontically in order to close unacceptable interdental spaces. Five patients had paired aplasia. The remaining five patients had interdental spaces of different genesis. Supra-crestal connective tissue fibres w re surgically removed in all patients but only on one side of the jaw in the children with paired aplasia. The non-operated side of these children served as a control side. The stability of the orthodontic treatment was acceptable. No definite difference between the operated and the control side was recorded. The histological analysis of the removed tissue did not reveal anything unexpected but a rich infiltration of inflammatory cells. It is suggested that inflammation might aid the reorganization of the connective tissues in this area.

scholarly journals Third Molar and Their Relationship with Caries on the Distal Surface of Second Molar: A Meta-analysis

2017 ◽  
Vol 17 (2) ◽  
pp. 129-141 ◽  
Author(s):  
José Cristiano Ramos Glória ◽  
Carolina Castro Martins ◽  
Anna Catharina Vieira Armond ◽  
Endi Lanza Galvão ◽  
Cássio Roberto Rocha Dos Santos ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Third Molar ◽  
Second Molar ◽  
Distal Surface

scholarly journals Postextraction Alveolar Preservation and Use of the Crown of the Extracted Tooth as a Temporary Restoration

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Andrea Rodríguez Moreno ◽  
Mariné Ortiz Magdaleno ◽  
Marissa Muñoz Islas ◽  
Jorge Armando Villar Mercado ◽  
María del Pilar Goldaracena Azuara ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Bone Tissue ◽  
Clinical Case ◽  
Soft Tissues ◽  
Anterior Tooth ◽  
Defect Site ◽  
The Stability ◽  
Provisional Restoration

Ranging from the extraction of teeth from anterior sector commitment to the loss of bone and soft tissues, alveolar preservation is a regenerative technique that employs biomaterials that induce the preservation of bone tissue and minimize resorption. Placement of provisional restorations at the defect site maintains the stability of the soft tissues and aesthetics at which the definitive restoration is found. The objective of this clinical case was alveolar preservation postextraction of the anterior tooth that presented a coronal fracture, placing the clinical crown of the extracted tooth as the provisional restoration to maintain stability and to avoid soft tissue collapse and compromise to an aesthetic area.

scholarly journals Feasibility of 3-Dimensional Visual Guides for Preparing Pediatric Zirconia Crowns: An In Vitro Study

2020 ◽  
Vol 17 (16) ◽  
pp. 5732
Author(s):  
Ho Yeon Kang ◽  
Hyeonjong Lee ◽  
Yong Kwon Chae ◽  
Seoung-Jin Hong ◽  
Yun Yeong Jeong ◽  
...  
Keyword(s):  
Three Dimensional ◽  
In Vitro Study ◽  
Mixed Dentition ◽  
Preparation Time ◽  
Second Molar ◽  
Significant Difference ◽  
Distal Surface ◽  
Zirconia Crowns ◽  
Tooth Preparation

This study evaluated the feasibility of a tooth preparation guide for prefabricated zirconia crowns (PZCs). Three-dimensional surface data for PZCs of the left maxillary primary first molar and left mandibular primary second molar were obtained using a model scanner. The tooth preparation data were digitally designed to harmonize with the adjacent teeth on the mixed dentition model and visualized using a color-coded map, which presents the required amount of tooth reduction. Twenty participants were recruited for preparing teeth with and without using the tooth preparation guide. The following three parameters were evaluated: tooth preparation time, harmony score, and amount of tooth reduction. The preparation time when using the guide was significantly reduced (p < 0.05), and a significant difference was observed in the harmony scores for the maxillary primary first molar preparation. Furthermore, the amount of tooth reduction was significantly different for both maxillary and mandibular primary molars (p < 0.05) in terms of the occlusal distal surface and buccal line angle in the maxillary primary first molars, and the smooth surfaces, proximal surfaces, and mesial line angles in the mandibular primary second molars. Thus, the results suggest that a tooth preparation guide could facilitate better tooth preparation for PZCs.

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