Evaluation of Canine Retraction through Distraction of the Periodontal Ligament: A Clinical Study

2012 ◽  
Vol 13 (6) ◽  
pp. 799-805
Author(s):  
KV Sujan Kumar ◽  
K Umashankar ◽  
D Pradeep Kumar ◽  
D Praveen Kumar
Keyword(s):  
Clinical Study ◽  
Periodontal Ligament ◽  
Treatment Time ◽  
Treatment Protocol ◽  
Overall Treatment Time ◽  
Premolar Extraction ◽  
Canine Retraction ◽  
Periodontal Condition ◽  
Anterior Teeth ◽  
Almost All

ABSTRACT Aim The aim of this study is to evaluate the efficiency of canine distraction and also to evaluate the position of canine in the arch after distraction. Materials and methods The study sample consisted of five patients, (4 males and 1 female), in the age group of 14 to 25 years who needed canine retraction (ten maxillary canines including both left and right) and first premolar extraction as their treatment protocol were included in the study. This study used a in-house manufactured periodontal ligament distractor. Results The maxillary canines were distracted distally by 6.42 mm in three and half weeks with a distal tipping of around 15.1° and the maxillary first molars tipped mesially by an average of 6.1°. The maxillary canines rotated mesiobucally by an average of 7.8° bilaterally. Conclusion: Canines can be distracted rapidly with minimal effects on the vitality and the periodontal condition and almost all of extraction space can be used for anterior dental alignment or retraction. Maxillary canines can be rapidly retracted into the first premolar extraction space at the rate of about 2.43 mm per week. Conclusion Canines can be distracted rapidly with minimal effects on the vitality and the periodontal condition and almost all of extraction space can be used for anterior dental alignment or retraction. Maxillary canines can be rapidly retracted into the first premolar extraction space at the rate of about 2.43 mm per week. Clinical significance The overall treatment time is reduced as the time taken for retraction of canine is decreased considerably from 6 and 8 months to 3 weeks. Also there is no significant anchorage loss during this period and is well suitable for cases with group a anchorage where the whole extraction space is needed for retraction of anterior teeth. How to cite this article Kumar KVS, Umashankar K, Kumar DP, Kumar DP. Evaluation of Canine Retraction through Distraction of the Periodontal Ligament: A Clinical Study. J Contemp Dent Pract 2012;13(6):799-805.

scholarly journals Comparison of Rate of Canine Retraction into Recent Extraction Site with and without Gingival Fiberotomy: A Clinical Study

2013 ◽  
Vol 14 (3) ◽  
pp. 419-426 ◽  
Author(s):  
Amit Kalra ◽  
Nitin Jaggi ◽  
Manu Bansal ◽  
Sumant Goel ◽  
Sonali V Medsinge ◽  
...  
Keyword(s):  
Clinical Study ◽  
Periodontal Ligament ◽  
Tooth Movement ◽  
Time Span ◽  
Canine Retraction ◽  
Extraction Site ◽  
The Mean ◽  
Clinically Significant ◽  
Two Sides ◽  
Rate Of Movement

ABSTRACT Aim Retraction of maxillary canines after first premolar extractions is a very common orthodontic task in cases of crowding or for the correction of large overjet. Many studies have been done to increase the rate of retraction. The aim is to compare the rate of canine retraction into recent extraction site with and without circumferential supracrestal fiberotomy. Materials and methods The rate of movement of the canines into the recent extraction site of the first premolar with or without circumferential supracrestal fiberotomy was measured in 14 patients aged 13 to 22 years. The study was done on 9 maxillary and 5 mandibular arches. The appliance used in the present study was the preadjusted edgewise (0.022 inch Roth prescription) and retraction performed by frictionless mechanics using Composite T Loop. The distalization of canines was measured at regular intervals (T1, T2, T3 and T4). Recordings of the positions of the canines at the beginning and at different intervals were made from dental casts. Results The mean difference between the two sides for the total time span T1-T4, for maxillary arch was 0.36 mm and for mandibular arch was 0.60 mm respectively. Conclusion There can be various factors that affect the rate of tooth movement. Factors like bone density, bone metabolism, and turnover in the periodontal ligament, amount of force applied may be responsible for the variation. Clinical significance No clinically significant increased rate of retraction of cuspids in the recent extraction site with fiberotomy was found in comparison to the retraction in recent extraction site without fiberotomy. How to cite this article Kalra A, Jaggi N, Bansal M, Goel S, Medsinge SV, Abraham R, Jasoria G. Comparison of Rate of Canine Retraction into Recent Extraction Site with and without Gingival Fiberotomy: A Clinical Study. J Contemp Dent Pract 2013;14(3):419-426.

scholarly journals Canines on a Fast Track: Canine Distalization by Dentoalveolar Distraction Osteogenesis

2013 ◽  
Vol 2 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Amit Bhardwaj ◽  
Anup Belludi ◽  
Bhavna Virang ◽  
Sagar Padmawar ◽  
Parag Virang
Keyword(s):  
Distraction Osteogenesis ◽  
Efficient Method ◽  
Slow Rate ◽  
Fast Track ◽  
Tooth Movement ◽  
Treatment Time ◽  
Overall Treatment Time ◽  
Canine Retraction ◽  
Rapid Movement ◽  
Canine Distalization

ABSTRACT Conventional techniques for biological tooth movement is routinely achieved at a slow rate and in high anchorage cases where individual canine retraction is indicated lasts for 6 to 8 months, followed by retraction of the incisors. Hence, the overall treatment time taken is about 18 to 24 months. Rapid canine distalization through dentoalveolar distraction (DAD) technique can be achieved within 2 to 3 weeks with this technique. This clinically efficient method significantly reduces the overall treatment time without causing any serious discomfort or damage to the patient. In this technique osteotomies surrounding the canines are made to achieve rapid movement of the canines within the dentoalveolar segment, in compliance with distraction osteogenesis principles. How to cite this article Virang B, Belludi A, Bhardwaj A, Padmawar S, Virang P. Canines on a Fast Track: Canine Distalization by Dentoalveolar Distraction Osteogenesis. Int J Experiment Dent Sci 2013;2(1):44-49.

scholarly journals The Effect of Q-Switched Nd:YAG 1064 nm/532 nm Laser in the Treatment of Onychomycosis In Vivo

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Kostas Kalokasidis ◽  
Meltem Onder ◽  
Myrto-Georgia Trakatelli ◽  
Bertrand Richert ◽  
Klaus Fritz
Keyword(s):  
Clinical Study ◽  
Treatment Time ◽  
Prospective Clinical Study ◽  
Self Evaluation ◽  
Time Period ◽  
Level Of Satisfaction ◽  
Before And After ◽  
532 Nm

In this prospective clinical study, the Q-Switched Nd:YAG 1064 nm/532 nm laser (Light Age, Inc., Somerset, NJ, USA) was used on 131 onychomycosis subjects (94 females, 37 males; ages 18 to 68 years). Mycotic cultures were taken and fungus types were detected. The laser protocol included two sessions with a one-month interval. Treatment duration was approximately 15 minutes per session and patients were observed over a 3-month time period. Laser fluencies of 14 J/cm2were applied at 9 billionths of a second pulse duration and at 5 Hz frequency. Follow-up was performed at 3 months with mycological cultures. Before and after digital photographs were taken. Adverse effects were recorded and all participants completed “self-evaluation questionnaires” rating their level of satisfaction. All subjects were well satisfied with the treatments, there were no noticeable side effects, and no significant differences were found treating men versus women. At the 3-month follow-up 95.42% of the patients were laboratory mycologically cured of fungal infection. This clinical study demonstrates that fungal nail infections can be effectively and safely treated with Q-Switched Nd:YAG 1064 nm/532 nm laser. It can also be combined with systemic oral antifungals providing more limited treatment time.

scholarly journals Intermolar Mandibular Distraction Osteogenesis—A Preliminary Report

2021 ◽  
Vol 11 (9) ◽  
pp. 4118
Author(s):  
Suen A. N. Lie ◽  
Britt H. B. T. Engelen ◽  
Veronique C. M. L. Timmer ◽  
Nico M. P. Vrijens ◽  
Paolo Asperio ◽  
...  
Keyword(s):  
Distraction Osteogenesis ◽  
Treatment Time ◽  
Average Length ◽  
Case Series ◽  
Growth Spurt ◽  
Overall Treatment Time ◽  
Mandibular Distraction ◽  
Mandibular Distraction Osteogenesis ◽  
Root Fractures

Background: Dental Class II is the most common indication for combined orthodontic-orthognathic treatment. Intermolar mandibular distraction osteogenesis (IMDO) treatment was performed during the growth spurt, to avoid surgery at a later age. The aim of this study is to present our first experience with IMDO. Methods: This is a retrospective case series of patients who underwent an IMDO. All patients showed mandibular retrognathism, and orthodontic treatment with functional appliances was not successful. Results: In total, 20 patients (mean age of 14.8 years (SD = 0.9 ys) were included. All patients achieved a Class I occlusion. An average length gain of 9.6 mm (SD = 3.7 mm) was reached. In one patient an abscess occurred. Nine patients presented with root fractures of the second molar; three were lost, one treated endodontically. The average time between insertion and removal of the distractors was 4.6 months (SD = 1.5 mths). In one case a premature consolidation was seen. Conclusion: We achieved satisfactory results with IMDO, although undesirable effects occurred. An advantage is the manageable overall treatment time. Open questions concern the occurrence of root fractures. Furthermore, the question of long-term stability is open. The question of dynamic distraction treatment in relation to temporomandibular joint changes can only be answered in the long term.

scholarly journals Finite Element Analysis of Mandibular Anterior Teeth with Healthy, but Reduced Periodontium

2021 ◽  
Vol 11 (9) ◽  
pp. 3824
Author(s):  
Ioana-Andreea Sioustis ◽  
Mihai Axinte ◽  
Marius Prelipceanu ◽  
Alexandra Martu ◽  
Diana-Cristala Kappenberg-Nitescu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Periodontal Ligament ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Real Data ◽  
Element Analysis ◽  
Anterior Teeth ◽  
Applied Forces ◽  
Orthodontic Forces

Finite element analysis studies have been of interest in the field of orthodontics and this is due to the ability to study the stress in the bone, periodontal ligament (PDL), teeth and the displacement in the bone by using this method. Our study aimed to present a method that determines the effect of applying orthodontic forces in bodily direction on a healthy and reduced periodontium and to demonstrate the utility of finite element analysis. Using the cone-beam computed tomography (CBCT) of a patient with a healthy and reduced periodontium, we modeled the geometric construction of the contour of the elements necessary for the study. Afterwards, we applied a force of 1 N and a force of 0.8 N in order to achieve bodily movement and to analyze the stress in the bone, in the periodontal ligament and the absolute displacement. The analysis of the applied forces showed that a minimal ligament thickness is correlated with the highest value of the maximum stress in the PDL and a decreased displacement. This confirms the results obtained in previous clinical practice, confirming the validity of the simulation. During orthodontic tooth movement, the morphology of the teeth and of the periodontium should be taken into account. The effect of orthodontic forces on a particular anatomy could be studied using FEA, a method that provides real data. This is necessary for proper treatment planning and its particularization depends on the patient’s particular situation.

Primary Human Liver Cells as Source for Modular Extracorporeal Liver Support - a Preliminary Report

2002 ◽  
Vol 25 (10) ◽  
pp. 1001-1005 ◽  
Author(s):  
I.M. Sauer ◽  
K. Zeilinger ◽  
N. Obermayer ◽  
G. Pless ◽  
A. Grünwald ◽  
...  
Keyword(s):  
Human Liver ◽  
Treatment Time ◽  
Liver Perfusion ◽  
Cell Mass ◽  
Liver Weight ◽  
Liver Cells ◽  
Liver Support ◽  
Overall Treatment Time ◽  
Human Liver Cells ◽  
Extracorporeal Liver Support

Cell-based extracorporeal liver support is an option to assist or replace the failing organ until regeneration or until transplantation can be performed. The use of porcine cells or tumor cell lines is controversial. Primary human liver cells, obtained from explanted organs found to be unsuitable for transplantation, are a desirable cell source as they perform human metabolism and regulation. The Modular Extracorporeal Liver Support (MELS) concept combines different extracorporeal therapy units, tailored to suit the individual and intra-individual clinical needs of the patient. A multi-compartment bioreactor (CellModule) is loaded with human liver cells obtained by 5-step collagenase liver perfusion. A cell mass of 400 g – 600 g enables the clinical application of a liver lobe equivalent hybrid organ. A detoxification module enables single pass albumin-dialysis via a standard high-flux dialysis filter, and continuous venovenuous hemodiafiltration may be included if required. Cells from 54 human livers have been isolated (donor age: 56 ± 13 years, liver weight: 1862 ± 556 g resulting in a viability of 55.0 ± 15.9%). These grafts were not suitable for LTx, due to steatosis (54%), cirrhosis (15%), fibrosis (9%), and other reasons (22%). Out of 36 prepared bioreactors, 10 were clinically used to treat 8 patients with liver failure. The overall treatment time was 7–144 hours. No adverse events were observed. Initial clinical applications of the bioreactor evidenced the technical feasibility and safety of the system.

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