Comparison of apical resorption of endodontically treated teeth before and after orthodontic movement with clear aligner: A preliminary radiometric study

ABSTRACT Objective: The present study aimed at comparing the external lateral root resorption (ELRR) and external apical root resorption (EARR) between teeth moved through the atrophic edentulous ridge and those undergoing the usual orthodontic movement. Methods: Fifty-four premolars were evaluated, where 27 of them had been moved toward the edentulous ridge (Group 1) and 27 from the same patient, had not been translated, which comprised the control group (Group 2). ELRR was evaluated by 0-3 scores and EARR was evaluated by 0-4 scores, before and after movement. Measurements were compared by Kruskal-Wallis and Student-Newman-Keuls tests. Results: ELRR increased statistically only in the Group 1 (p< 0.05). After orthodontic treatment, it was observed that almost 56% (n = 15) of teeth in Group 1 presented scores 2 and 3, while Group 2 presented scores 2 and 3 in about 11% (n= 3) of the teeth. EARR increased in both groups after orthodontic movement, however, statistically analyses showed no significant differences between groups (p> 0.05). Conclusions: Orthodontic movement into the atrophic edentulous ridge is subject to a greater lateral external root resorption.

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Microbiological analysis of endodontically treated teeth with apical periodontitis before and after endodontic retreatment

Clinical Oral Investigations ◽

10.1007/s00784-020-03510-2 ◽

2020 ◽

Author(s):

Marlos Barbosa-Ribeiro ◽

Rodrigo Arruda-Vasconcelos ◽

Lidiane M. Louzada ◽

Danielle G. dos Santos ◽

Fernando D. Andreote ◽

...

Keyword(s):

Apical Periodontitis ◽

Microbiological Analysis ◽

Endodontically Treated Teeth ◽

Before And After ◽

Endodontic Retreatment

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Orthodontic movement of endodontically treated teeth

Dental Press Journal of Orthodontics ◽

10.1590/s2176-94512013000400002 ◽

2013 ◽

Vol 18 (4) ◽

pp. 2-7 ◽

Cited By ~ 4

Author(s):

Alberto Consolaro ◽

Renata Bianco Consolaro

Keyword(s):

Clinical Practice ◽

Dental Trauma ◽

Endodontic Treatment ◽

Periapical Lesion ◽

Careful Evaluation ◽

Endodontically Treated Teeth ◽

Orthodontic Movement

Often there is the need of moving teeth endodontically treated or teeth still in endodontic treatment. In order to collaborate with the comprehension and substantiation of the following subjects will be discussed: 1) Orthodontic movement in endodontically treated teeth without periapical lesion, 2) Orthodontic movement in endodontically treated teeth with inflammatory periapical lesion, and 3) Orthodontic movement in teeth endodontically treated due to aseptic pulp necrosis by dental trauma. In practically all situations, endodontically treated teeth to be orthodontically moved must be subjected to a careful evaluation by the endodontist about the conditions, adequate or not, of the endodontic treatment. Then, in this paper it was sought to induce an insight for new clinical researches about the theme that may definitely prove the information obtained by interrelations of information in parallel to clinical practice.

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Properties of Orthodontic Clear Aligner Materials - A Review

Journal of Evolution of Medical and Dental Sciences ◽

10.14260/jemds/2021/668 ◽

2021 ◽

Vol 10 (37) ◽

pp. 3288-3294

Author(s):

Binu Punnoose Gold ◽

Suvetha Siva ◽

Sangeetha Duraisamy ◽

Azmina Idaayath ◽

Ravi Kannan

Keyword(s):

Mechanical Properties ◽

Optical Properties ◽

Orthodontic Treatment ◽

Thermoplastic Material ◽

Lingual Orthodontics ◽

White Spots ◽

Before And After ◽

Materials Used ◽

Orthodontic Devices ◽

Clear Aligner

BACKGROUND Clear aligners are orthodontic devices that are transparent, a plastic used to correct malaligned teeth. Here patient wears a series of customized clear, removable aligners that gradually move the teeth to the desired position. The clear aligner system is a modern adaptation of the systems described since the middle of the 20th century, therefore there were different devices and philosophies that have led to its creation and the system has evolved a lot over the decades. Clear aligner therapy has been a part of the orthodontic practice for years, but, popularity was increased since the introduction of Invisalign appliances (Align Technology) in 1998. There are almost 27 different clear aligner products currently on offer for orthodontic treatment. Nowadays, more people prefer clear aligner treatment because it is aesthetically superior to brackets and lingual orthodontics. The superiority of clear aligners lies in their aesthetics. The optical properties of the clear aligner material play a major role in aesthetics. The rising demand among adult patients for “invisible” orthodontic treatment has led to an exponential growth in the clear aligner market. Indeed, these aligners have a low aesthetic impact, as well as being able to effectively and progressively guide the teeth into their programmed positions. They are also removable and therefore do not hamper oral hygiene maintenance, in turn reducing the risk of white spots, caries, gingivitis and periodontal disease. All the materials do not possess the same chemical composition. The properties change before and after wear. In this article, we bring out the different materials used for the manufacture of clear aligners and their various properties. KEY WORDS Clear Aligners, Optical Properties, Thermoplastic Material, Mechanical Properties

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Behavior of partially formed roots of teeth submitted to orthodontic movement

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.28.2.56n643558770p763 ◽

2005 ◽

Vol 28 (2) ◽

pp. 147-154 ◽

Cited By ~ 5

Author(s):

Omar Gabriel da Silva Filho ◽

Olívia de Freitas Mendes ◽

Terumi Okada Ozawa ◽

Flávio Mauro Ferrari Junior ◽

Tatiana Mattosinho Correa

Keyword(s):

Root Formation ◽

Root Resorption ◽

Treatment Time ◽

Mixed Dentition ◽

Orthodontic Movement ◽

Before And After ◽

The Mean

The occurrence of root resorption in orthodontically treated permanent incisors with partially formed roots was investigated using periapical radiographs taken before and after the orthodontic leveling in the mixed dentition. The mean age at the beginning of treatment was 9 years and the mean treatment time was 7.1 months. The findings showed that the orthodontic movement during root formation causes no root resorption. The longitudinal follow-up showed that incompletely formed roots developed normally.

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Comparison of Root Resorption in Endodontically and Non-Endodontically Treated Teeth in Patients with Fixed Orthodontic Treatment during 2009-2018

Journal of Shahid Sadoughi University of Medical Sciences ◽

10.18502/ssu.v27i9.2311 ◽

2020 ◽

Author(s):

Mehri Esfandiar ◽

Maryam Sadat Seidaie ◽

Mahdi Tabrizizade ◽

Hossein Aghili ◽

Narjes Hoshyari

Keyword(s):

Orthodontic Treatment ◽

Root Resorption ◽

Medical Sciences ◽

Endodontically Treated Teeth ◽

Panoramic Radiographs ◽

Anterior Teeth ◽

Significant Difference ◽

Before And After ◽

The Mean ◽

Dental Offices

Introduction: Apical root Resorption is a common occurrence during fixed orthodontic treatment. This study used panoramic radiographs to compare the rate of root resorption in endodontically-treated and non-endodontically-treated roots. Methods: In this descriptive-analytic study, panoramic radiographs of 20 patients aged 11-18 years with Class I Crowding and Class II Mild Skeletal malocclusions and with one or more endodontically-treated maxillary anterior teeth in one side and corresponding non-endodontically-treated teeth on the other side of the jaw were selected. They had presented to Dental School of Shahid Sadoughi University of Medical Sciences and private dental offices in Yazd. All panoramic radiographs of central and lateral maxillary incisors obtained before and after treatment were scanned and displayed on a large monitor with X2 magnification. In this way, the real magnitude of root degeneration was estimated by comparing the root heights in the pre- and post-treatment radiographs. The data were analyzed by SPSS 22 and T-test. Results: The findings showed that the greatest rate of root resorption was observed in the upper maxillary lateral incisors of endodontically-treated teeth by 1 mm and in maxillary lateral incisors of the non-endodontically-treated teeth by 1.5 mm. The mean root resorption was 0.325 mm in the endodontically-treated teeth and 1.025 mm in the non-endodontically treated teeth with a statistically significant difference (P>0.001). Conclusion: The results demonstrated that root resorption was smaller after treatment in endodontically-treated teeth than non-endodontically-treated teeth.

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Effect of clear aligner therapy on the buccolingual inclination of mandibular canines and the intercanine distance

The Angle Orthodontist ◽

10.2319/012615-59.1 ◽

2015 ◽

Vol 86 (1) ◽

pp. 10-16 ◽

Cited By ~ 10

Author(s):

Thorsten Grünheid ◽

Sara Gaalaas ◽

Hani Hamdan ◽

Brent E. Larson

Keyword(s):

Orthodontic Treatment ◽

Statistical Significance ◽

Cone Beam ◽

Fixed Appliance ◽

Before And After ◽

Fixed Appliances ◽

Clear Aligner ◽

Intercanine Distance

ABSTRACT Objective: To compare the changes in buccolinugal inclination of mandibular canines and intercanine distance in patients treated with clear aligners to those treated with preadjusted edgewise appliances. Materials and Methods: The buccolingual inclination of mandibular canines and the intercanine distance were measured on pre- and posttreatment cone-beam computed tomograms of 30 patients who had been treated with clear aligners and 30 patients who had been treated with fixed preadjusted edgewise appliances. Differences between the aligner and fixed appliance groups and between pre- and posttreatment measurements were tested for statistical significance. Results: In both groups, most of the mandibular canines had positive buccolingual inclinations (ie, their crowns were positioned lateral to their roots) both before and after treatment. While there was no difference between the groups pretreatment, the posttreatment buccolingual inclination was significantly greater in the aligner group. In the fixed appliance group, the canines became more upright with treatment, while the buccolingual inclination did not change significantly in the clear aligner group. The intercanine distance did not differ between the groups either before or after treatment. However, it increased significantly over the course of treatment in the aligner group, whereas it did not change significantly in the fixed appliance group. Conclusions: Orthodontic treatment with clear aligners tends to increase the mandibular intercanine distance with little change in inclination in contrast to treatment with fixed appliances, which leaves the intercanine distance unchanged but leads to more upright mandibular canines.

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Deformation Replication

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100068394 ◽

1970 ◽

Vol 28 ◽

pp. 280-281

Author(s):

J. Temple Black

Keyword(s):

Cutting Speed ◽

Machining Process ◽

Depth Of Cut ◽

Rake Face ◽

Orthogonal Machining ◽

Aluminum Chips ◽

Before And After ◽

Materials Used ◽

Glass Knife ◽

Very High

Tool materials used in ultramicrotomy are glass, developed by Latta and Hartmann (1) and diamond, introduced by Fernandez-Moran (2). While diamonds produce more good sections per knife edge than glass, they are expensive; require careful mounting and handling; and are time consuming to clean before and after usage, purchase from vendors (3-6 months waiting time), and regrind. Glass offers an easily accessible, inexpensive material ($0.04 per knife) with very high compressive strength (3) that can be employed in microtomy of metals (4) as well as biological materials. When the orthogonal machining process is being studied, glass offers additional advantages. Sections of metal or plastic can be dried down on the rake face, coated with Au-Pd, and examined directly in the SEM with no additional handling (5). Figure 1 shows aluminum chips microtomed with a 75° glass knife at a cutting speed of 1 mm/sec with a depth of cut of 1000 Å lying on the rake face of the knife.

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The Clinical, Roentgenological and Morphological Effects of an Acute Exposure of Phosgene on the Lungs of Dogs

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100065237 ◽

1971 ◽

Vol 29 ◽

pp. 236-237

Author(s):

R. F. Bils ◽

W. F. Diller ◽

F. Huth

Keyword(s):

Latent Period ◽

Chemical Industry ◽

Toxic Substance ◽

Lung Edema ◽

X Rays ◽

Beagle Dogs ◽

Male And Female ◽

Morphological Alterations ◽

Before And After ◽

Electron Microscopes

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.

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Ultrastructure of Melanin Formation in Curvularia sp., Alternaria sp., and Drechslera Sorokiniana

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100079449 ◽

1977 ◽

Vol 35 ◽

pp. 398-399

Author(s):

M. H. Wheeler ◽

W. J. Tolmsoff ◽

A. A. Bell

Keyword(s):

Potassium Phosphate ◽

Thielaviopsis Basicola ◽

Wild Type ◽

Potassium Phosphate Buffer ◽

Transmission Microscopy ◽

Electron Transmission ◽

Melanin Formation ◽

Before And After ◽

Alternaria Sp ◽

Electron Transmission Microscopy

(+)-Scytalone [3,4-dihydro-3,6,8-trihydroxy-l-(2Hj-naphthalenone] and 1,8-di- hydroxynaphthalene (DHN) have been proposed as intermediates of melanin synthesis in the fungi Verticillium dahliae (1, 2, 3, 4) and Thielaviopsis basicola (4, 5). Scytalone is enzymatically dehydrated by V. dahliae to 1,3,8-trihydroxynaphthalene which is then reduced to (-)-vermelone [(-)-3,4- dihydro-3,8-dihydroxy-1(2H)-naphthalenone]. Vermelone is subsequently dehydrated to DHN which is enzymatically polymerized to melanin.Melanin formation in Curvularia sp., Alternaria sp., and Drechslera soro- kiniana was examined by light and electron-transmission microscopy. Wild-type isolates of each fungus were compared with albino mutants before and after treatment with 1 mM scytalone or 0.1 mM DHN in 50 mM potassium phosphate buffer, pH 7.0. Both chemicals were converted to dark pigments in the walls of hyphae and conidia of the albino mutants. The darkened cells were similar in appearance to corresponding cells of the wild types under the light microscope.

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