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Original Article:
Effect of gingival fibroblasts and ultrasound on dogs' root resorption during orthodontic treatment
Jacqueline Crossman, Ali H Hassan, Ali Saleem, Nayef Felemban, Saleh Aldaghreer, Elham Fawzi, Mamdouh Farid, Khaled Abdel-Ghaffar, Ausama Gargoum, Tarek El-Bialy
J Orthodont Sci
2017, 6:28 (2 January 2017)
DOI
:10.4103/2278-0203.197396
PMID
:28197400
Objectives:
To investigate the effect of using osteogenic induced gingival fibroblasts (OIGFs) and low intensity pulsed ultrasound (LIPUS) on root resorption lacunae volume and cementum thickness in beagle dogs that received orthodontic tooth movement.
Materials and Methods:
Seven beagle dogs were used, from which gingival cells (GCs) were obtained and were induced osteogenically to produce OIGFs. Each third and fourth premolar was randomly assigned to one of the five groups, namely, LIPUS, OIGFs, bone morphogenetic protein-2 (BMP-2), OIGFs + LIPUS, and control. All groups received 4 weeks of bodily tooth movement, then LIPUS-treated groups received LIPUS for 20 min/day for 4 weeks, and OIGFs groups received an injection of OIGFs near the root apex. Microcomputed tomography analysis was used to calculate root resorption lacunae volume and histomorphometric analysis was performed to measure the cementum thickness of each root at 3 root levels on compression and tension sides.
Results:
There was no significant difference in resorption volume between the treatment groups. OIGFs + LIPUS increased cementum thickness (
P
> 0.05) in third premolars near the apex, and LIPUS increased cementum thickness (
P
> 0.05) in fourth premolars near the apex. Furthermore, BMP2 increased cementum thickness at the coronal third at the compression side.
Conclusion:
OIGFs, LIPUS, and BMP-2 can be potential treatments for orthodontically induced root resorption, however, improvements in experimental design and treatment parameters are required to further investigate these repair modalities.
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Original Article:
Bolton tooth size ratio among qatari population sample: An odontometric study
Hayder A Hashim, Najah AL-Sayed, Hashim AL-Hussain
J Orthodont Sci
2017, 6:22 (2 January 2017)
DOI
:10.4103/2278-0203.197395
PMID
:28197399
Objectives:
To establish the overall and anterior Bolton ratio among a sample of Qatari population and to investigate whether there is a difference between males and females, as well as to compare the result obtained by Bolton.
Materials and Methods:
The current study consisted of 100 orthodontic study participants (50 males and 50 females) with different malocclusions and age ranging between 15 and 20 years. An electronic digital caliper was used to measure the mesiodistal tooth width of all maxillary and mandibular permanent teeth except second and third molars. The Student's
t
-test was used to compare tooth-size ratios between males and females and between the results of the present study and Bolton's result.
Results:
The anterior and overall ratio in Qatari individuals were 78.6 ± 3.4 and 91.8 ± 3.1, respectively. The tooth size ratios were slightly greater in males than that in females, however, the differences were not statistically significant (
P
> 0.05). There were no significant differences in the overall ratio between Qatari individuals and Bolton's results (
P
> 0.05), whereas statistical significant differences were observed in anterior ratio (
P
= 0.007).
Conclusions:
Within the limitation of the limitations of the present study, definite conclusion was difficult to establish. Thus, a further study with a large sample in each malocclusion group is required.
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Original Article:
Efficacy of quercetin flavonoid in recovering the postbleaching bond strength of orthodontic brackets: A preliminary study
Mana Shamsedin, Valiollah Arash, Masoud Babaei Jahromi, Ali Akbar Moghadamnia, Manouchehr Rahmati Kamel, Fariba Ezoji, Ali bijani, Samira Kavoli, Tania Ghasemi, Gholamhossein Ramezani
J Orthodont Sci
2017, 6:16 (2 January 2017)
DOI
:10.4103/2278-0203.197394
PMID
:28197398
Objectives:
To evaluate comparatively the effect of quercetin on postbleaching shear bond strength (SBS) and adhesive remnant index (ARI).
Materials
and
Methods:
Intact maxillary premolars were divided randomly into 12 groups of 10 each: (1) bonding the bracket immediately after bleaching, (2) bonding 1 week after bleaching, (3-8) application of three experimental concentrations of quercetin (0.1%, 0.5%, and 1%) at two time durations (5 and 10 min), (9-10) application of the solvent of quercetin at two time periods (5 and 10 min), (11) application of 10% sodium ascorbate for 10 min, and (12) bonding the brackets on nonbleached teeth. Bleaching was performed using 15% carbamide peroxide gel for 5 days (6 h daily). After incubation and thermocycling, the SBS of brackets was measured. The ARI too was recorded at ×20. The data were analyzed statistically (α =0.05).
Results
: Bleaching reduced the SBS below 10 Megapascal (MPa) level (
P
< 0.05) while all the postbleaching treatments (except the application of the solvent of quercetin) recovered the SBS back to values greater than 10 MPa (
P
< 0.05) and also back to nonbleached SBS levels (
P
> 0.01). All eight postbleaching treatments had rather similar efficacies (
P
= 0.1396). The concentration of quercetin (beta = 0.259,
P
= 0.042) but not its duration (beta = 0.213,
P
= 0.093) significantly improved its efficacy.
Conclusion:
Bleaching can weaken the bond strength of orthodontic brackets below acceptable levels. The application of quercetin or Vitamin C or delaying the bracket bonding improved the postbleaching SBS.
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Original Article:
Timing considerations on the shear bond strength of orthodontic brackets after topical fluoride varnish applications
Gianguido Cossellu, Valentina Lanteri, Andrea Butera, Nicola Laffi, Alberto Merlini, Giampietro Farronato
J Orthodont Sci
2017, 6:11 (2 January 2017)
DOI
:10.4103/2278-0203.197392
PMID
:28197397
Objectives:
To assess the best temporal association between the application of a fluoride varnish on enamel and bonding procedures.
Materials and Methods:
Eighty mandibular bovine incisors were used. Teeth were divided into 4 groups (20 per group); Groups 1-3 were treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent, Schaan, Liechtenstein), and Group 4 served as control with no pretreatment. Tooth were stored in deionized water (37°C) and subjected to thermal cycling for 400 (Group 1), 800 (Group 2), and 2500 (Group 3) cycles corresponding, respectively, to 15, 30, and 90 days in order to simulate the three different timing of bracket bonding. Shear bond strength (SBS) was measured using an Instron Universal Testing machine. Tooth surfaces were examined under a stereomicroscope at 10× magnification to assess the amount of adhesive remnant index (ARI). One-way analysis of variance (ANOVA) and Tukey's honestly significant difference post-hoc test were used for the comparison of SBS values between groups (
P
< 0.05). The Chi-square test was used to examine differences among ARI scores. (
P
< 0.05).
Results:
One-way ANOVA and Tukey post-hoc test showed that the SBS of different groups were significantly different and was impacted by different timing of bonding (
P
< 0.05). The main differences were between the control group (17.02 ± 6.38 MPa) and Group 1 (6.93 ± 4.3 MPa). The ARI scores showed that there were no significant differences between the four tested groups.
Conclusions:
The SBS of the brackets bonded 15 days after the application of the fluoride was set back to an optimal value.
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Original Article:
Comparison of the effect of labiolingual inclination and anteroposterior position of maxillary incisors on esthetic profile in three different facial patterns
Praveen Chirivella, Gowri Sankar Singaraju, Prasad Mandava, V Karunakar Reddy, Jeevan Kumar Neravati, Suja Ani George
J Orthodont Sci
2017, 6:1 (2 January 2017)
DOI
:10.4103/2278-0203.197387
PMID
:28197396
Objective:
To test the null hypothesis that there is no effect of esthetic perception of smiling profile in three different facial types by a change in the maxillary incisor inclination and position.
Materials
and
Methods:
A smiling profile photograph with Class I skeletal and dental pattern, normal profile were taken in each of the three facial types dolichofacial, mesofacial, and brachyfacial. Based on the original digital image, 15 smiling profiles in each of the facial types were created using the FACAD software by altering the labiolingual inclination and anteroposterior position of the maxillary incisors. These photographs were rated on a visual analog scale by three panels of examiners consisting of orthodontists, dentists, and nonprofessionals with twenty members in each group. The responses were assessed by analysis of variance (ANOVA) test followed by
post
hoc
Scheffe.
Results:
Significant differences (
P
< 0.001) were detected when ratings of each photograph in each of the individual facial type was compared. In dolichofacial and mesofacial pattern, the position of the maxillary incisor must be limited to 2 mm from the goal anterior limit line. In brachyfacial pattern, any movement of facial axis point of maxillary incisors away from GALL is worsens the facial esthetics. The result of the ANOVA showed differences among the three groups for certain facial profiles.
Conclusion:
The hypothesis was rejected. The esthetic perception of labiolingual inclination and anteroposterior of maxillary incisors differ in different facial types, and this may effect in formulating treatment plans for different facial types.
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September
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[
11
]
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[
24
]
2022
October
[
11
]
August
[
15
]
May
[
24
]
January
[
6
]
2021
October
[
7
]
August
[
6
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July
[
5
]
February
[
6
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2020
November
[
5
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August
[
5
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July
[
4
]
February
[
5
]
2019
October
[
4
]
August
[
5
]
May
[
5
]
February
[
5
]
2018
November
[
5
]
September
[
5
]
June
[
6
]
February
[
8
]
2017
October
[
7
]
June
[
6
]
May
[
6
]
January
[
5
]
2016
October
[
5
]
July
[
5
]
March
[
6
]
February
[
7
]
January
[
6
]
2015
July
[
7
]
April
[
4
]
January
[
6
]
2014
October
[
7
]
July
[
5
]
May
[
5
]
February
[
4
]
2013
December
[
5
]
October
[
5
]
July
[
5
]
April
[
5
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January
[
4
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2012
November
[
5
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August
[
5
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April
[
5
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© Journal of Orthodontic Science | Published by Wolters Kluwer -
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Online since 01 August, 2011