Clinical Application of Micro-Implant Anchorage in Initial Orthodontic Retraction

2015 ◽  
Vol 41 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Shaji Wahabuddin ◽  
Rohan Mascarenhas ◽  
Mahamad Iqbal ◽  
Akhter Husain
Keyword(s):  
Implant Stability ◽  
Orthodontic Anchorage ◽  
Anterior Teeth ◽  
Space Closure ◽  
The Stability ◽  
The Right ◽  
Micro Implants ◽  
Cephalometric Measurements ◽  
Implant Anchorage ◽  
Anchor Loss

Micro-implant is a device that is temporarily fixed to bone for the purpose of enhancing orthodontic anchorage either by supporting the teeth of the reactive unit or by obviating the need for the reactive unit altogether, and which is subsequently removed after use. The purpose of this study was to evaluate the clinical efficiency of micro-implants in reinforcing anchorage during the initial retraction of anterior teeth, check the rate of initial retraction for 8 weeks, and assess the stability of micro-implants during this period. Eighteen micro-implants were placed (10 in the maxilla and 8 in the mandible) and immediately loaded with 200–250 g of force using 9-mm closed coil Nitinol springs. The amount of space closure was measured every 2 weeks until the eighth week. Cephalometric measurements were made at the end of the study to evaluate anchor loss, if any. Micro-implant stability was also assessed. The rate of initial retraction in the maxilla at the end of 8 weeks was 1.65 mm/quadrant and 1.51 mm/quadrant in the mandible. The amount of retraction on the left side of the arches was 1.66 mm/quadrant and 1.49 mm/quadrant on the right side. The average initial retraction for both arches per month was 0.78 mm. An anchor loss of 0.1 mm (0.06%) was observed in the maxilla while no mandibular anchor loss was recorded. The rate of initial retraction observed in the maxilla was more than that achieved in the mandible. Initial retraction was also more on the left side of the arches. There was no anchor loss in the mandible. The micro-implant-reinforced anchorage was helpful in minimizing anchor loss and accepted heavy traction forces but did not bring about a faster rate of retraction.

scholarly journals A Brief Review on Micro-Implants and Their Use in Orthodontics and Dentofacial Orthopaedics

2021 ◽  
Vol 11 (22) ◽  
pp. 10719
Author(s):  
Sorana-Maria Bucur ◽  
Luminița Ligia Vaida ◽  
Cristian Doru Olteanu ◽  
Vittorio Checchi
Keyword(s):  
Selection Criteria ◽  
Meta Analysis ◽  
Experimental Investigations ◽  
Success Rates ◽  
Clinical Factors ◽  
Orthodontic Anchorage ◽  
Related Factors ◽  
Temporary Anchorage Devices ◽  
The Stability ◽  
Micro Implants

The aim of this study was to review the literature and evaluate the failure rates and factors that affect the stability and success of temporary anchorage devices (TADs) used as orthodontic anchorage. Data was collected from electronic databases: MEDLINE database and Google Scholar. Four combinations of term were used as keywords: “micro-implant”, “mini-implant”, “mini-screw”, and “orthodontics”. The following selection criteria were used to select appropriate articles: articles on implants and screws used as orthodontic anchorage, published in English, with both prospective and retrospective clinical and experimental investigations. The search provided 209 abstracts about TADs used as anchorage. After reading and applying the selection criteria, 66 articles were included in the study. The data obtained were divided into two topics: which factors affected TAD success rate and to what degree and in how many articles they were quoted. Clinical factors were divided into three main groups: patient-related, implant related, and management-related factors. Although all articles included in this meta-analysis reported success rates of greater than 80 percent, the factors determining success rates were inconsistent between the studies analyzed and this made conclusions difficult.

scholarly journals Evaluation of Angular Changes of Canine in En Masse Retraction of Maxillary Anterior Teeth Using Power Arm and Titanium Mini-Implant - A Split Mouth Randomised Control Study

2021 ◽  
Vol 10 (8) ◽  
pp. 522-526
Author(s):  
Harshil Naresh Joshi ◽  
Santosh Kumar Goje ◽  
Narayan Kulkarni ◽  
Romil Shah ◽  
Samarth Chellani ◽  
...  
Keyword(s):  
Tooth Movement ◽  
Angular Position ◽  
Clinical Situation ◽  
Maxillary Canine ◽  
Premolar Extraction ◽  
Anterior Teeth ◽  
The Difference ◽  
The Right ◽  
Implant Anchorage ◽  
En Masse Retraction

BACKGROUND This study was conducted to determine angular changes of maxillary canine in en masse retraction of anterior teeth in a new modified power arm with a conventional intraoral anchorage unit compared to a mini-implant anchorage in the first premolar extraction case. We wanted to compare angular changes of maxillary canine between modified conventional anchorage with a power arm and titanium mini-implant anchorage in en masse retraction. METHODS A total of 15 participants requiring maxillary first premolar extraction was selected for this study. In each participant, the en mass retraction was carried out with miniimplants on one side & modified conventional anchorage with a power arm on the other side. The choice of mode of retraction on the right and the left side was done based on the coin flip method. Angular position of the maxillary canine was evaluated on orthopantomogram (OPG) & diagnostic cast. RESULTS A mean disto-palatal rotation observed post retraction was of 9° on the conventional anchorage side & 9.86° on the mini-implant anchorage side. A mean difference in maxillary canine angulations post retraction was 1.13° on the conventional anchorage side and 0.93° on the mini-implant side. An increase in angle suggested the tipping of canine teeth. The difference was very small which was not statistically & clinically significant. CONCLUSIONS There was no difference in the type of tooth movement during retraction by miniimplant and power arm suggesting minimal variation in teeth movement in the anterior region. So, the choice mainly depends on the type of the anchorage required in the given clinical situation. KEY WORDS Anchorage, Mini-Implant, Power Arm, Type of Tooth Movement

scholarly journals Management of a Class I malocclusion with traumatically avulsed maxillary central and lateral incisors

2018 ◽  
Vol 89 (4) ◽  
pp. 661-671
Author(s):  
Nesrine Z. Mostafa ◽  
Anthony P. G. McCullagh ◽  
David B. Kennedy
Keyword(s):  
Treatment Approach ◽  
Class I ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Deep Bite ◽  
Maxillary Central Incisor ◽  
Orthodontic Space Closure ◽  
Anterior Teeth ◽  
Space Closure ◽  
The Right

ABSTRACT This case report describes orthodontic space closure for managing an avulsed maxillary central incisor and a lateral incisor in a growing girl with a Class I deep bite malocclusion with moderate lower and mild upper crowding. The treatment approach moved a central incisor across the midline and substituted a lateral incisor for a central incisor, in combination with canine substitution. Veneers on all maxillary anterior teeth attained acceptable esthetics. The right central incisor was moved to serve as the avulsed left central incisor. The right lateral incisor was moved to the position of the right central incisor and restored. The canines on both sides were substituted as lateral incisors; the posterior occlusion was left in Class II. Mesialization of central and lateral incisors with prosthetic rehabilitation is an acceptable treatment option.

scholarly journals Evaluation of posttreatment stability after orthodontic treatment in the mixed and permanent dentitions

2016 ◽  
Vol 86 (6) ◽  
pp. 1010-1018 ◽  
Author(s):  
Heesoo Oh ◽  
Ning Ma ◽  
Ping ping Feng ◽  
Katherine Kieu ◽  
Roger Boero ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Regression Line ◽  
Maxillary Incisor ◽  
Mandibular Incisor ◽  
Arch Width ◽  
Anterior Teeth ◽  
Age Related ◽  
The Stability ◽  
Cephalometric Measurements ◽  
Fixed Retainers

ABSTRACT Objective: To investigate posttreatment changes in the maxillary and mandibular arches in patients who underwent orthodontic treatment during the mixed and permanent dentitions. Materials and Methods: The sample was collected retrospectively from three private practices and consisted of 42 patients who were at least 10 years out of orthodontic treatment. The longitudinal records of study casts and cephalometric radiographs were analyzed to quantify posttreatment changes. Results: Minimal changes in maxillary and mandibular irregularity occurred after an average of 16.98 years from completion of treatment. More than 10 years posttreatment, approximately 81% of the maxillary anterior teeth and 88% of the mandibular anterior teeth showed clinically acceptable incisor alignment (<3.5 mm). Mandibular fixed retainers greatly aided in maintaining the stability of the mandibular incisor alignment. However, posttreatment changes in maxillary incisor irregularity did not appear to be influenced by the presence of a mandibular fixed retainer. When compared with longitudinal changes observed in untreated subjects, the increase in incisor irregularity resembled a pattern similar to the regression line of untreated subjects and seems to be entirely age related. Arch width and arch depth was consistently decreased after treatment, but the magnitude of change was minimal at about 1 mm. No associations were found between any of the cephalometric measurements and changes in incisor irregularities. Conclusions: Orthodontic treatment stability can be achieved and mandibular fixed retention appears to be a valuable contributor, especially in patients with further growth expected.

scholarly journals SPACE CLOSURE IN BIALVEOLAR DENTAL PROTRUSION CASES - A COMPARATIVE COMBINATION METHOD

2017 ◽  
Vol 10 (7) ◽  
pp. 106
Author(s):  
Chaitanya N ◽  
Arshad Am ◽  
Praveen Krk ◽  
Prashant C ◽  
Sandeep Bailwad ◽  
...  
Keyword(s):  
Clinical Study ◽  
Combination Method ◽  
Mini Implants ◽  
Space Closure ◽  
Lateral Cephalograms ◽  
Comparative Clinical Study ◽  
Implant Anchorage ◽  
En Masse Retraction ◽  
Anchor Loss ◽  
Rate Of Movement

Objective: To measure and compare the amount, rate and anchor loss after the en masse retraction of all anteriors with titanium mini-implant anchorage and conventional molar anchorage.Methods: This comparative clinical study sample comprised 12 patients (10 females, 2 males; mean age between 16 and 22 years). The implants were placed in the maxillary and mandibular arches. Preretraction and post retraction lateral cephalograms were taken for measuring the amount, rate and anchor loss after the retraction.Results: Mean en masse retraction amounts, the rate of movement per month, and horizontal and vertical anchor loss at the maxillary implant site were 4.79 mm, 0.58 mm, 0 mm, and 0 mm, respectively. In the mandible, on implant sides were 4.66 mm, 0.56 mm, 0 mm, and 0 mm. Mean en masse retraction amounts, the rate of movement per month, and horizontal and vertical anchor loss at the maxillary conventional molar anchor side were 4.08 mm, 0.49 mm, 2.91 mm, and 1.66 mm. In the mandible, on conventional anchor sides were 3.54 mm, 0.48 mm, 3.12 mm, and 1.95 mm.Conclusion: En masse retraction had a faster rate of space closure with mini-implants as anchor units than the conventional molar anchorage preparation. 

Symmetrizable Difference Dchemes

2005 ◽  
Vol 5 (1) ◽  
pp. 3-50 ◽  
Author(s):  
Alexei A. Gulin
Keyword(s):  
Initial Data ◽  
Difference Scheme ◽  
Difference Schemes ◽  
Time Dependent ◽  
Stability Boundaries ◽  
Typical Representative ◽  
Variable Weight ◽  
The Stability ◽  
Conditions Of Stability ◽  
The Right

AbstractA review of the stability theory of symmetrizable time-dependent difference schemes is represented. The notion of the operator-difference scheme is introduced and general ideas about stability in the sense of the initial data and in the sense of the right hand side are formulated. Further, the so-called symmetrizable difference schemes are considered in detail for which we manage to formulate the unimprovable necessary and su±cient conditions of stability in the sense of the initial data. The schemes with variable weight multipliers are a typical representative of symmetrizable difference schemes. For such schemes a numerical algorithm is proposed and realized for constructing stability boundaries.

Pemanfaatan Metil Ester Sulfonat pada Pembuatan Deterjen Cair

2016 ◽  
Vol 7 (14) ◽  
pp. 143-155
Author(s):  
Eldha Sampepana ◽  
Suroto Hadi Saputra
Keyword(s):  
Fatty Acids ◽  
Methyl Ester ◽  
Linear Alkylbenzene Sulfonate ◽  
Emulsion Stability ◽  
Alcohol Sulfate ◽  
Stable Emulsion ◽  
Linear Alkylbenzene ◽  
Alkylbenzene Sulfonate ◽  
The Stability ◽  
The Right

In the manufacture of detergents still using surfactants (which serves as an emulsifier) of crude oil in the form of the AS. (alcohol sulfate) and LAS (linear alkylbenzene sulfonate), where this type of surfactant cannot be degraded by microorganisms when discharged into the environment, causing environmental pollution. Methyl ester sulfonate surfactant is an anionic surfactant which has a composition of C16 - C18 fatty acids are capable of acting against nature deterjensinya, while the C12 - C14 fatty acids contribute to the foaming effect. The purpose of this study was to look for the formulation of methyl ester sulfonate (MES) the right to produce a good detergent by using materials such as methyl ester sulfonate surfactant self-made, methyl ester sulfonate and sodium lauryl market Ester Sulfate (SLS) with a concentration of 15 %, 20 % and 25 %. Detergent results of the study have high detergency ( net ) compared with the detergency of detergent commercial, have a stable emulsion stability, the stability of the foam/foam detergent power made from methyl ester sulfonate surfactant produces less foam, compared with a detergent made from SLS and surfactant SNI 06-4075-1996 standards.

Current literature review on methods for measuring the stability of osseointegrable implants.

2020 ◽  
Vol 2 (4) ◽  
pp. 64-78
Author(s):  
Noha El-Wassefy ◽  
Lars Sennerby ◽  
Dhoom SIngh Mehta ◽  
Thiago De Santana Santos
Keyword(s):  
Literature Review ◽  
Current Literature ◽  
Implant Survival ◽  
Implant Stability ◽  
Implant Placement ◽  
Factors Influencing ◽  
Case Documentation ◽  
Bone To Implant Contact ◽  
The Stability

“Osseointegration” as formulated by Alberktson is crucial for implant survival and success. Osseointegration is a measure of implant stability. Measuring implant stability helps to arrive at decisions as to loading of an implant, allows choice of protocol on a patient to patient basis and provides better case documentation. A successful implant reflects good bone to implant contact and is determined by implant stability both primary and secondary. Implant stability is achieved at two different stages – primary (immediately after implant placement) and secondary (3-4 months after implant placement). Implant stability has been confirmed to affect the process of osseointegration and therefore is essential to understand the methods to measure implant stability and factors influencing. Various methods are developed to assess implant stability which suggests the prognosis of an implant.

scholarly journals Comparison of the accuracy of intraoral scans between complete-arch scan and quadrant scan

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Youn-Gyeong Moon ◽  
Kyung-Min Lee
Keyword(s):  
Third Molar ◽  
Careful Consideration ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Posterior Quadrant ◽  
Left Posterior ◽  
The Right ◽  
Best Fit ◽  
Posterior Area

Abstract Objective To compare the accuracy of complete-arch scans and quadrant scans obtained using a direct chairside intraoral scanner. Material and methods Intraoral scans were obtained from 20 adults without missing teeth except for the third molar. Maxillary and mandibular complete-arch scans were carried out, and 4 quadrant scans for each arch were performed to obtain right posterior, right anterior, left anterior, and left posterior quadrant scans. Complete-arch scans and quadrant scans were compared with corresponding model scans using best-fit surface-based registration. Shell/shell deviations were computed for complete-arch scans and quadrant scans and compared between the complete-arch scans and each quadrant scans. In addition, shell/shell deviations were calculated also for each individual tooth in complete-arch scans to evaluate factors which influence the accuracy of intraoral scans. Results Complete-arch scans showed relatively greater errors (0.09 ~ 0.10 mm) when compared to quadrant scans (0.05 ~ 0.06 mm). The errors were greater in the maxillary scans than in the mandibular scans. The evaluation of errors for each tooth showed that the errors were greater in posterior teeth than in anterior teeth. Comparing the right and left errors, the right side posterior teeth showed a more substantial variance than the left side in the mandibular scans. Conclusion The scanning accuracy has a difference between complete-arch scanning and quadrant scanning, particularly in the posterior teeth. Careful consideration is needed to avoid scanning inaccuracy for maxillary or mandibular complete-arch, particularly in the posterior area because a complete-arch scan might have potential error than a quadrant scan.

scholarly journals Tooth Movement Efficacy of Retraction Spring Made of a New Low Elastic Modulus Material, Gum Metal, Evaluated by the Finite Element Method

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2934
Author(s):  
Naohiko Tamaya ◽  
Jun Kawamura ◽  
Yoshinobu Yanagi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tooth Movement ◽  
The Finite Element Method ◽  
Bodily Movement ◽  
Anterior Teeth ◽  
Low Elastic Modulus ◽  
Space Closure ◽  
Gum Metal ◽  
Element Method

The aim of this study was to evaluate the tooth movement efficacy of retraction springs made of a new β-titanium alloy, “gum metal”, which has a low Young’s modulus and nonlinear super elasticity. Using double loop springs incorporated into an archwire made of gum metal (GUM) and titanium molybdenum alloy (TMA), the maxillary anterior teeth were moved distally to close an extraction space. The long-term movements were simulated by the finite element method. Its procedure was constructed of two steps, with the first step being the calculation of the initial tooth movement produced by elastic deformation of the periodontal ligament, and in the second step, the alveolar socket was moved by the initial tooth movement. By repeating these steps, the tooth moved by accumulating the initial tooth movement. The number of repeating calculations was equivalent to an elapsed time. In the GUM and TMA springs, the anterior teeth firstly tipped lingually, and then became upright. As a result of these movements, the canine could move bodily. The amount of space closure in GUM spring was 1.5 times that in TMA spring. The initial tipping angle of the canine in the GUM spring was larger than that in the TMA spring. The number of repeating calculations required for the bodily movement in the GUM spring was about two times that in the TMA spring. It was predicted that the speed of space closure in the GUM spring was smaller than that in the TMA spring.

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