Orthodontics
HIRAL THAKKAR; BRIJESH PRAJAPATI; ANAR G ANDANI; ARTH PATEL; BHAVYA TRIVEDI; SONALI MAHADEVIA
Abstract
INTRODUCTION - The purpose of this in-vivo study is to compare & determine the accuracy of dental measurements calculated on physical models & digital models with the measurements taken directly from the patients’ mouth.
MATERIALS AND METHOD - This study was performed on 40 subjects. Forty ...
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INTRODUCTION - The purpose of this in-vivo study is to compare & determine the accuracy of dental measurements calculated on physical models & digital models with the measurements taken directly from the patients’ mouth.
MATERIALS AND METHOD - This study was performed on 40 subjects. Forty maxillary impressions were made using a condensation silicone putty material and made as physical model. Digital Vernier Caliper was utilized to take direct measurements from patient’s mouth as well as from the physical models. CS 3600® was employed for direct intra-oral scanning for subject’s dentition and generating the digital model. 3D reverse engineering software was used to make measurements on the digital model. One-way ANOVA test was used to determine the accuracy between control group, physical models and virtual group. Tukey’s post-hoc analysis was done to compare between individual group.
RESULTS - There were no statistically significant differences between the physical models and virtual models as compared to those measurements taken directly from the mouth.
CONCLUSIONS - The results of the present study indicate that the intraoral scans are clinically acceptable for diagnosis and treatment planning in dentistry and offers a professional valid alternative to use of conventional plaster models.
Orthodontics
KALASHRI K K; GOUTHAM B; SUNIL MUDDAIAH; SANJU SOMAIAH; B K SHETTY; NAMITHA NANU
Abstract
ABSTRACT:
Background- Shorter duration of orthodontic treatment is the need for hour in current practice for the orthodontists and the patients. The submucosal injection of platelet rich plasma (PRP) is a technique developed for accelerating the orthodontic tooth movement by stimulating the effects of ...
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ABSTRACT:
Background- Shorter duration of orthodontic treatment is the need for hour in current practice for the orthodontists and the patients. The submucosal injection of platelet rich plasma (PRP) is a technique developed for accelerating the orthodontic tooth movement by stimulating the effects of bone insult without surgery and alveolar bone loss.
Aim-To assess and compare the rate of en-masse retraction between PRP induced and conventional retraction methods.
Materials and method-The sample size comprised of 10 patients requiring first premolar extractions as part of fixed orthodontic treatment. The split mouth design study was done where in one side retraction was carried out with submucosal injection of PRP which is the experimental side and on the other side conventional retraction was done which is control side using active tie back measured with dontrix gauge of a constant force of 200gm was applied.
Result-The results of the study showed that space closure was faster at the experimental side where PRP was given unlike control side.
Conclusion- Comparison of rate of retraction between control side and experimental side showed that PRP assisted en-masse retraction was faster than conventional retraction.
Clinical trial registry number-CTRI/2021/09/036510
Dentofacial orthopedics
Prerna Pahuja; Divya Yadav; Harshita Gupta; Gurkeerat Singh; Monika Dahiya; Arisha Izhar; Akanksha Shukla; Deepali Bisht
Abstract
Background and Aim: Among various retraction methods for first premolar extraction space closure, the palatal approach is preferred to labial appliances in cases having high esthetic demand. A FEM and clinical randomized prospective trial was undertaken to find out the possibility of en-mass retraction ...
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Background and Aim: Among various retraction methods for first premolar extraction space closure, the palatal approach is preferred to labial appliances in cases having high esthetic demand. A FEM and clinical randomized prospective trial was undertaken to find out the possibility of en-mass retraction of maxillary anteriors using palatal TAD’s and a clear aligner like appliance in patients undergoing extraction of maxillary 1st premolars and to study the effects of the above using 3D scanned models & lateral cephalograms.
Methodology: A Finite Element Model of maxillary dentition along with alveolar bone, acrylic splint on anterior six teeth ,palatal implants and short E-chain was developed with defined material properties. The model was analysed to calculate the displacement when force was applied from different levels. Thereafter, the finite element analysis findings were applied to the 10 patients requiring fixed orthodontic treatment with first premolar extraction and fulfilling the inclusion criteria. Impressions were made and the rate of retraction evaluated at 4-week intervals by superimposition of scanned models.
Result: En-mass bodily retraction was seen when both canine hook and palatal TAD was placed at 10mm distance from respective gingival margin. Clinically subjects showed significant retraction at that level and statistically significant results in some cases.
Conclusion: Translational tooth movement was observed when line of force application was at level of centre of resistance.
Orthodontics
VEDAVATHI H.K; Priyanka Roy; SHASHANK P KUMAR; SOWMYA K.S
Abstract
Background- Frankfort horizontal line and sella- nasion lines are the most widely accepted landmarks in cephalometric analysis. This study investigates the use of the orbito-condylion line extending from the orbitale to the condylion as a novel horizontal line of the skull for substituting the Frankfort ...
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Background- Frankfort horizontal line and sella- nasion lines are the most widely accepted landmarks in cephalometric analysis. This study investigates the use of the orbito-condylion line extending from the orbitale to the condylion as a novel horizontal line of the skull for substituting the Frankfort horizontal line. Similarly, the evaluation of the orbito-basion line as an alternative to sella- nasion line in cephalometric analysis, is done.
Methods- This investigation is carried out as study on 30 individuals. The porion, orbitale, condylion, sella, nasion, and basion were identified and indicated. The angles between the orbito-meatal line (inferior orbital rim to porion; the Frankfort line) and the orbito-condylion line (inferior orbital rim to condylion) were measured. Likewise, the angles between the sella- nasion line (centre of sella tursica to nasion) and the orbito-basion line (inferior orbital rim to basion) were measured.
Results-There was no significant interobserver and intraobserver bias. The overall angle between the Frankfort line and orbito-condylion line was 0.5°±2.27° (mean±standard deviation) and the angle between the sella nasion line and orbito-basion line was 3.48°±3.11°.
Conclusion-This study demonstrated good reproducibility, reliability and good efficacy of the new lines. The orbito-condylion and orbito- basion lines are reliable, reproducible, and easily identifiable lines, and has potential as novel standard horizontal lines to replace or at least supplement the Frankfort line and sella- nasion lines in anthropological studies and clinical applications.
Orthodontics
Mahesh Jain; Dolly Patel
Abstract
Introduction: With the increase use of CBCT scans in orthodontic diagnosis and treatment planning. It could be prudent to validate the use of radiographic images obtained from CBCT instead of multiple conventional radiographs. Hence, the present study was designed to assess whether a difference exists ...
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Introduction: With the increase use of CBCT scans in orthodontic diagnosis and treatment planning. It could be prudent to validate the use of radiographic images obtained from CBCT instead of multiple conventional radiographs. Hence, the present study was designed to assess whether a difference exists between cephalometric measurements based on manual tracings (MT), digitized lateral cephalograms (DLC) and in lateral cephalograms generated from CBCT scans. Materials and Methods: Conventional lateral cephalograms and cone beam computed tomography (CBCT) scans from ten subjects from departmental archives were selected to test the three methods: manual tracings, digitized lateral cephalograms, and lateral cephalograms derived from CBCT. 17 measurements were evaluated and retraced after a 7-day period. The intra examiner errors was assessed using paired T test and Dahlberg formula. The pearson correlation test and ANOVA tests were used to compare the differences between the methods. Results: Most of the measurements had intra-examiner reliability in all three methods. Eight measurements were statistically different between the methods. Conclusion: All three methods proved to be reliable and reproducible with minimum error in measurement of lateral cephalogram derived from CBCT. CBCT scan advised for complex cases can be used to generate lateral cephalogram image, which may reduce the need for multiple radiographs; thereby reducing the radiation exposure and cost.
Orthodontics
Nirali Mehulbhai Shah; khyati viral patel; Ajay kantilal Kubavat; manish desai; harshit arvindbhai patel; nikunj harikrushn prajapati
Abstract
The aim of this study was to evaluate the shear bond strength of orthodontic brackets following early and delayed rebonding and after employing different methods of composite removal.It is an in vitro study.60 premolars were randomly assigned in to 4 groups after initial debonding and recording the SBS, ...
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The aim of this study was to evaluate the shear bond strength of orthodontic brackets following early and delayed rebonding and after employing different methods of composite removal.It is an in vitro study.60 premolars were randomly assigned in to 4 groups after initial debonding and recording the SBS, ARI index was assessed, as defined by Artun and Bergland .the removal of adhesive remnants in the group 1 by round bur, group 2 by a rubber wheel bur, group 3 by 12 fluted tungsten carbide bur & in 4th group by scaler. & in all group after adhesive removal teeth were kept in artificial saliva for 1 month. Then rebonding with new bracket was done to measure second SBS and ARI Index.2 representative samples from each group were examined under a scanning electron microscope following adhesive removal. After primary bonding there was no statistically significant difference in SBS value within the groups, but there was a significant difference between primary and secondary bonding SBS values after removal of adhesive remnant with different methods.There was significant decrease in secondary SBS value in group 1 .Group 3 (tungsten carbide bur) shows significant increase in secondary SBS value.group 4 shows slight decrease in SBS.SEM photograph shows composite remnants in all the 4 groups, but there are fewer remnants in group 2 suggesting better option for tooth surface cleaning.SEM image of group 3 shows enamel surface damage. ARI index shows no significant difference .
Orthodontics
Mahdjoube Goldani Moghadam; haniye kazemi; mohadese baniasadi
Abstract
Abstract
Introduction: This study aims to compare the shear bond strength of different combinations of retainer wires and enamel preparation methods.
Materials and methods: A total of 180 extracted mandibular bovine incisors were randomly divided into nine groups of 20 paired teeth each. Three enamel ...
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Abstract
Introduction: This study aims to compare the shear bond strength of different combinations of retainer wires and enamel preparation methods.
Materials and methods: A total of 180 extracted mandibular bovine incisors were randomly divided into nine groups of 20 paired teeth each. Three enamel preparation methods were used: acid etch only, Er:YAG laser before acid etch and, sandblast before acid etch. The retainer wires, including Bond-A-Braid, GAC Wildcat Twistflex Wire, and TruForce coaxial wire, were bonded with the adhesive Transbond LR and SBS values were measured.
Results: The highest shear bond strength value was found for sandblasted surface bonded with Bond-A-Braid wire. The combination of acid etched enamel/GAC Wildcat Twistflex Wire revealed the lowest value of the SBS. No statistically significant difference was found regarding the ARI among the study groups.
Conclusion: Sandblasting and laser irradiation prior to the acid etching significantly increased the SBS. Differences in the SBS values of different wires were insignificant.
Orthodontics
Pranshu Mathur; Shally Mahajan; Aftab Azam; Ashish Chauhan; Ragni Tandon
Abstract
Introduction – The objective of the authors was to compare the tooth movement using platelet rich plasma (PRP) and conventional method in patients with moderate crowding during leveling and aligning phase.
Methods –Fifty patients were chosen who had moderate crowding in the maxillary arch. ...
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Introduction – The objective of the authors was to compare the tooth movement using platelet rich plasma (PRP) and conventional method in patients with moderate crowding during leveling and aligning phase.
Methods –Fifty patients were chosen who had moderate crowding in the maxillary arch. Split mouth study design was planned with one quadrant allotted as experimental group (PRP side) and other as control group. 5 injection sites were pre-defined – distal surface of the root of the central incisor, mesial and distal root surfaces of lateral incisor and canine. After the extraction of permanent maxillary first premolars, PRP was injected at the various sites on the experimental side while the other side served as control group. In each group, 4 time points were studied – 0(T0), 21(T1), 42(T2) and 63(T3) days. Tooth movement was measured using Digital Vernier Calliper and statistical analysis was done using paired-t test.
Results – Significant (p<0.001) amount of tooth movement was seen at 21 days. No significant difference in the amount of tooth movement was found at 42 days (p=0.265) and 63 days (p=0.104).
Conclusion – Platelet-Rich Plasma is responsible for accelerating the orthodontic tooth movement in moderate crowding patient when injected during the leveling and aligning phase for the first 21 days after injection while its was non-effective after 42 and 63 days.
cleft lip and palate
Daniela Garib; Raquel Poletto; Thagid Yasmin Leal Almeida; Silvia Graziadei; Guilherme Janson
Abstract
Aim: This study compared the prevalence of tooth agenesis out of the cleft area in patients with complete bilateral cleft lip and palate (BCLP) with and without agenesis of maxillary permanent lateral incisors.
Materials and Methods: Tooth agenesis was evaluated in panoramic radiographs taken between ...
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Aim: This study compared the prevalence of tooth agenesis out of the cleft area in patients with complete bilateral cleft lip and palate (BCLP) with and without agenesis of maxillary permanent lateral incisors.
Materials and Methods: Tooth agenesis was evaluated in panoramic radiographs taken between 7 and 11 years of age. Intergroup comparison of tooth agenesis frequency was performed using the Chi-square test (P<0.05) and the Odds Ratio. A sample of 130 patients (87 male, 43 female) with non-syndromic bilateral cleft lip and palate was selected. Group P (n = 44) consisted of individuals with the presence of maxillary lateral incisor on the right and left sides; group UA (n = 40) comprised patients with unilateral agenesis of lateral incisors; group BA (n = 46) comprised patients with bilateral agenesis of lateral incisors.
Results: The prevalence of dental agenesis out of the cleft area in groups P, UA and BA was 31.8%, 32.5% and 60.8%, respectively. Group BA showed a significantly greater prevalence of tooth agenesis compared with the UA and P groups. There was no significant difference in the Odds Ratio between any groups. The most common absent teeth were the maxillary second premolars followed by the mandibular second premolars for all groups.
Conclusions: Patients with BCLP and bilateral agenesis of maxillary lateral incisors show an increased prevalence of other permanent teeth. This association demonstrates a genetic background of maxillary lateral incisor agenesis at the cleft area.
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