Diagnosis of alveolodental ankylosis in unerupted canines: one of the answers to why the canine does not come

ABSTRACT Introduction: Teeth frequently fail to erupt and situations arise that prevent the canines from reaching the occlusal plane. Objective: Discourse about the three situations in which the canine does not reach the occlusal plane, and remains unerupted; and at the same time, point how to make a safe diagnosis of alveolodental ankylosis - one of the three causes -, based on tomography. Conclusions: Ankylosis occurs in impacted teeth by atrophy of the periodontal ligament, including the epithelial rests of Malassez. The tomographic signs of alveolodental ankylosis in unerupted canines are the interruption of hypodense periodontal space, discontinuity of the lamina dura and its continuity with the root surface, which gradually loses its regular shape.

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Combination of Root Surface Modification with BMP-2 and Collagen Hydrogel Scaffold Implantation for Periodontal Healing in Beagle Dogs

The Open Dentistry Journal ◽

10.2174/1874210601509010052 ◽

2015 ◽

Vol 9 (1) ◽

pp. 52-59 ◽

Cited By ~ 10

Author(s):

Akihito Kato ◽

Hirofumi Miyaji ◽

Ryosuke Ishizuka ◽

Keisuke Tokunaga ◽

Kana Inoue ◽

...

Keyword(s):

Wound Healing ◽

Surface Modification ◽

Periodontal Ligament ◽

Alveolar Bone ◽

Root Surface ◽

Beagle Dogs ◽

Hydrogel Scaffold ◽

Collagen Hydrogel ◽

Periodontal Wound Healing ◽

Periodontal Attachment

Objective : Biomodification of the root surface plays a major role in periodontal wound healing. Root surface modification with bone morphogenetic protein (BMP) stimulates bone and cementum-like tissue formation; however, severe ankylosis is simultaneously observed. Bio-safe collagen hydrogel scaffolds may therefore be useful for supplying periodontal ligament cells and preventing ankylosis. We examined the effects of BMP modification in conjunction with collagen hydrogel scaffold implantation on periodontal wound healing in dogs. Material and Methods: The collagen hydrogel scaffold was composed of type I collagen sponge and collagen hydrogel. One-wall infrabony defects (5 mm in depth, 3 mm in width) were surgically created in six beagle dogs. In the BMP/Col group, BMP-2 was applied to the root surface (loading dose; 1 µg/µl), and the defects were filled with collagen hydrogel scaffold. In the BMP or Col group, BMP-2 coating or scaffold implantation was performed. Histometric parameters were evaluated at 4 weeks after surgery. Results: Single use of BMP stimulated formation of alveolar bone and ankylosis. In contrast, the BMP/Col group frequently enhanced reconstruction of periodontal attachment including cementum-like tissue, periodontal ligament and alveolar bone. The amount of new periodontal ligament in the BMP/Col group was significantly greater when compared to all other groups. In addition, ankylosis was rarely observed in the BMP/Col group. Conclusion: The combination method using root surface modification with BMP and collagen hydrogel scaffold implantation facilitated the reestablishment of periodontal attachment. BMP-related ankylosis was suppressed by implantation of collagen hydrogel.

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The Effect of Orthodontic Relapse on the Proliferation of Fibroblast and Epithelial Rests of Malassez in Periodontal Ligament of Rat Molars : A Histopathological Study

Journal of Baghdad College of Dentistry ◽

10.12816/0015077 ◽

2013 ◽

Vol 25 (4) ◽

pp. 114-119

Author(s):

Munad J. Al-Duliamy ◽

Ghada M. Mustafa ◽

Omar A. Kader

Keyword(s):

Periodontal Ligament ◽

Histopathological Study ◽

Epithelial Rests Of Malassez ◽

Rat Molars

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Preapplication of Orthodontic Forces to the Donor Teeth Affects Periodontal Healing of Transplanted Teeth

The Angle Orthodontist ◽

10.2319/020207-51.1 ◽

2008 ◽

Vol 78 (3) ◽

pp. 495-501 ◽

Cited By ~ 17

Author(s):

Yusuke Suzaki ◽

Yoshiro Matsumoto ◽

Zuisei Kanno ◽

Kunimichi Soma

Keyword(s):

Periodontal Ligament ◽

Root Resorption ◽

Root Surface ◽

Orthodontic Force ◽

Control Side ◽

Before And After ◽

Experimental Side ◽

Orthodontic Forces ◽

Periodontal Healing

Abstract Objective: To investigate how the preapplication of orthodontic forces to the donor teeth affects the periodontal healing after transplantation. Materials and Methods: The orthodontic force (1.5 cN) was applied to the maxillary right molars of 6-week-old male Spraque-Dawley rats (n = 21) in the experimental side, and the left side of the same animals was used as the control. After 7 days, both right and left maxillary second molars were extracted or replanted. Periodontal conditions were evaluated in the histological specimens 7 days after applying orthodontic force (before and after extraction) and 14 days after replantation. Results: The application of orthodontic force for 7 days significantly increased the periodontal ligament (PDL) space and also the width of the alveolar socket, which resulted in a rich attached PDL to the root surface of the extracted teeth. Significantly more root resorption was also detected in the control side without preapplication of orthodontic force 14 days after replantation. This root resorption might involve in the disruption of the PDL. Conclusion: These results suggested that the preapplication of orthodontic force to the donor teeth increased the PDL width and eased the extraction, which might decrease root resorption after replantation.

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Epithelial rests of Malassez: from latent cells to active participation in orthodontic movement

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.22.3.119-125.sar ◽

2017 ◽

Vol 22 (3) ◽

pp. 119-125

Author(s):

Bianca Silva e Silva ◽

Nathalia Carolina Fernandes Fagundes ◽

Bárbara Catarina Lima Nogueira ◽

José Valladares Neto ◽

David Normando ◽

...

Keyword(s):

Literature Review ◽

Functional Activity ◽

Periodontal Ligament ◽

Potential Functions ◽

Functional Structure ◽

Tissue Structure ◽

Periodontal Tissue ◽

Orthodontic Movement ◽

Epithelial Rests Of Malassez ◽

Cellular Debris

ABSTRACT Introduction: The epithelial rests of Malassez (ERM) represent a group of cells in the periodontal ligament classically consisting of latent or quiescent structures associated with pathological processes. However, recent evidence shows that these structures cannot be considered only as cellular debris. The ERM is a major tissue structure, with functions in maintaining the homeostasis of periodontal tissue, including the maintenance of orthodontic movement. Objective: The present literature review aims at presenting the potential functions of ERM, with emphasis on orthodontic movement and the functional structure of the periodontium. Conclusion: ERM cells have a functional activity in modulation of orthodontic movement, trough their potential for differentiation, maintenance functions and the capacity of repairing periodontium.

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Influence of dental exposure to oral environment on smear layer removal and collagen exhibition after using different conditioning agents

Brazilian Dental Journal ◽

10.1590/s0103-64402011000600007 ◽

2011 ◽

Vol 22 (6) ◽

pp. 479-485 ◽

Cited By ~ 4

Author(s):

Lucas Amaral Fontanari ◽

Shelon Cristina Souza Pinto ◽

Rodrigo Cavassim ◽

Rubens Spin-Neto ◽

Eduardo de Paula Ishi ◽

...

Keyword(s):

Surface Modification ◽

In Vitro Study ◽

Root Surface ◽

In Vivo Studies ◽

Impacted Teeth ◽

Surface Conditioning ◽

Oral Environment ◽

Root Surface Conditioning

Although in vitro studies have shown encouraging results for root surface conditioning with demineralizing agents, in vivo studies have failed to show its benefits in periodontal healing. This can be attributed to several factors, among which, the hypermineralization of dental surface. Therefore, this in vitro study compared, using scanning electron microscopy (SEM), the effect of root surface conditioning with different conditioners (1% and 25% citric acid, 24% EDTA and 50 mg/mL tetracycline hydrochloride) in impacted teeth and in teeth that had their roots exposed to the oral environment. One trained examiner assessed the SEM micrographs using a root surface modification index. There was a tendency of more root surface modification in the group of impacted teeth, suggesting that the degree of root mineralization influences its chemical demineralization.

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