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Van Le H, Nguyen TA, Vu TS. Regenerative Endodontic Procedures of Immature Permanent Premolars with Periapical Lesions: A Report of Two Cases Using Two Different Materials, 18-Month Follow-Up. Case Rep Dent 2023; 2023:5577474. [PMID: 38020963 PMCID: PMC10681770 DOI: 10.1155/2023/5577474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 11/03/2023] [Accepted: 11/08/2023] [Indexed: 12/01/2023] Open
Abstract
Regenerative endodontic procedure is an emerging alternative to traditional therapies for immature teeth with necrotic pulp with or without periapical lesions. This innovative approach, also known as revitalization procedures, is aimed at enhancing canal wall thickness, stimulating root lengthening, and promoting apical closure. The regenerative endodontic procedures involve minimally invasive cleaning to preserve stem cells, stimulation of bleeding and clot formation within the canal, and the use of biomaterials to stimulate differentiation. This method is the first choice in biologically based treatments for immature permanent teeth. We present two successful clinical cases in which regenerative endodontic procedures were performed on permanent premolars with necrotic pulp with symptomatic apical periodontitis and chronic apical abscess due to dens evaginatus. The same procedure was employed for both cases, utilizing two differential materials: ProRoot MTA (Dentsply Tulsa Dental Specialities, USA) and Biodentine™ (Septodont, Saint-Maur-des-Fossés, France). Both cases exhibited positive clinical and radiographic outcomes after an 18-month follow-up period including periapical healing, increased dentin thickness, root lengthening, and apical closure.
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Affiliation(s)
- Hong Van Le
- Department of High Technology Dental Treatment, National Hospital of Odonto-Stomatology, Hanoi, Vietnam
| | - Tuan Anh Nguyen
- Department of Endodontics, National Hospital of Odonto-Stomatology, Hanoi, Vietnam
| | - Thai Son Vu
- Endodontic Department, Dental Faculty, Hanoi University of Business and Technology, Hanoi, Vietnam
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2
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Noohi P, Abdekhodaie MJ, Nekoofar MH, Galler KM, Dummer PMH. Advances in Scaffolds Used for Pulp-Dentine Complex Tissue Engineering - A Narrative Review. Int Endod J 2022; 55:1277-1316. [PMID: 36039729 DOI: 10.1111/iej.13826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 07/28/2022] [Accepted: 08/10/2022] [Indexed: 11/27/2022]
Abstract
Pulp necrosis in immature teeth disrupts root development and predisposes roots to fracture as a consequence of their thin walls and open apices. Regenerative endodontics is a developing treatment modality whereby necrotic pulps are replaced with newly formed healthy tissue inside the root canal. Many clinical studies have demonstrated the potential of this strategy to stimulate root maturation and apical root-end closure. However, clinical outcomes are patient-dependent and unpredictable. The development of predictable clinical protocols is achieved through the interplay of the three classical elements of tissue engineering, namely, stem cells, signaling molecules, and scaffolds. Scaffolds provide structural support for cells to adhere and proliferate and also regulate cell differentiation and metabolism. Hence, designing and fabricating an appropriate scaffold is a crucial step in tissue engineering. In this review, four main classes of scaffolds used to engineer pulp-dentine complexes, including bioceramic-based scaffolds, synthetic polymer-based scaffolds, natural polymer-based scaffolds, and composite scaffolds, are covered. Additionally, recent advances in the design, fabrication, and application of such scaffolds are analysed along with their advantages and limitations. Finally, the importance of vascular network establishment in the success of pulp-dentine complex regeneration and strategies used to create scaffolds to address this challenge are discussed.
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Affiliation(s)
- Parisa Noohi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Mohammad J Abdekhodaie
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Mohammad H Nekoofar
- Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences Tehran University of Medical Sciences, Tehran, Iran.,Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran.,Department of Endodontic, Bahçeşehir University School of Dentistry, Istanbul, Turkey
| | - Kerstin M Galler
- Department of Conservative Dentistry and Periodontology, University Hospital Erlangen-Nürnberg, Erlangen, Germany
| | - Paul M H Dummer
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff, UK
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3
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Liu H, Lu J, Jiang Q, Haapasalo M, Qian J, Tay FR, Shen Y. Biomaterial scaffolds for clinical procedures in endodontic regeneration. Bioact Mater 2022; 12:257-277. [PMID: 35310382 PMCID: PMC8897058 DOI: 10.1016/j.bioactmat.2021.10.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 10/04/2021] [Accepted: 10/04/2021] [Indexed: 12/14/2022] Open
Abstract
Regenerative endodontic procedures have been rapidly evolving over the past two decades and are employed extensively in clinical endodontics. These procedures have been perceived as valuable adjuvants to conventional strategies in the treatment of necrotic immature permanent teeth that were deemed to have poor prognosis. As a component biological triad of tissue engineering (i.e., stem cells, growth factors and scaffolds), biomaterial scaffolds have demonstrated clinical potential as an armamentarium in regenerative endodontic procedures and achieved remarkable advancements. The aim of the present review is to provide a broad overview of biomaterials employed for scaffolding in regenerative endodontics. The favorable properties and limitations of biomaterials organized in naturally derived, host-derived and synthetic material categories were discussed. Preclinical and clinical studies published over the past five years on the performance of biomaterial scaffolds, as well as current challenges and future perspectives for the application of biomaterials for scaffolding and clinical evaluation of biomaterial scaffolds in regenerative endodontic procedures were addressed in depth. Overview of biomaterials for scaffolding in regenerative endodontics are presented. Findings of preclinical and clinical studies on the performance of biomaterial scaffolds are summarized. Challenges and future prospects in biomaterial scaffolds are discussed.
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Murad M, Duggal MS. INTRA-CANAL ANTIBIOTIC PASTES MAY PROMOTE THICKER DENTIN WALLS AND CALCIUM HYDROXIDE MAY PROMOTE MORE APICAL CLOSURE. J Evid Based Dent Pract 2022; 22:101728. [PMID: 35718432 DOI: 10.1016/j.jebdp.2022.101728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION Báez, Viviana; Corcos, Lorena; Morgillo, Florencia; Imperatrice, Lorena; Gualtieri, Ariel Félix (2022). Meta-analysis of regenerative endodontics outcomes with antibiotics pastes and calcium hydroxide. The apex of the iceberg. J Oral Biol Craniofac Res 12(1): 90-98. SOURCE OF FUNDING Non-funded study TYPE OF STUDY/DESIGN: Systematic review and meta-analysis.
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Lee ES, Aryal YP, Kim TY, Kim JY, Yamamoto H, An CH, An SY, Lee Y, Sohn WJ, Jung JK, Ha JH, Kim JY. Facilitation of Reparative Dentin Using a Drug Repositioning Approach With 4-Phenylbutric Acid. Front Physiol 2022; 13:885593. [PMID: 35600310 PMCID: PMC9114641 DOI: 10.3389/fphys.2022.885593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/20/2022] [Indexed: 11/23/2022] Open
Abstract
For hard tissue formation, cellular mechanisms, involved in protein folding, processing, and secretion play important roles in the endoplasmic reticulum (ER). In pathological and regeneration conditions, ER stress hinders proper formation and secretion of proteins, and tissue regeneration by unfolded protein synthesis. 4-Phenylbutyric acid (4PBA) is a chemical chaperone that alleviates ER stress through modulation in proteins folding and protein trafficking. However, previous studies about 4PBA only focused on the metabolic diseases rather than on hard tissue formation and regeneration. Herein, we evaluated the function of 4PBA in dentin regeneration using an exposed pulp animal model system via a local delivery method as a drug repositioning strategy. Our results showed altered morphological changes and cellular physiology with histology and immunohistochemistry. The 4PBA treatment modulated the inflammation reaction and resolved ER stress in the early stage of pulp exposure. In addition, 4PBA treatment activated blood vessel formation and TGF-β1 expression in the dentin-pulp complex. Micro-computed tomography and histological examinations confirmed the facilitated formation of the dentin bridge in the 4PBA-treated specimens. These results suggest that proper modulation of ER stress would be an important factor for secretion and patterned formation in dentin regeneration.
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Affiliation(s)
- Eui-Seon Lee
- Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Yam Prasad Aryal
- Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Tae-Young Kim
- Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Ji-Youn Kim
- Department of Dental Hygiene, Gachon University, Incheon, South Korea
| | - Hitoshi Yamamoto
- Department of Histology and Developmental Biology, Tokyo Dental College, Tokyo, Japan
| | - Chang-Hyeon An
- Department of Oral and Maxillofacial Radiology, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Seo-Young An
- Department of Oral and Maxillofacial Radiology, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Youngkyun Lee
- Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Wern-Joo Sohn
- Pre-Major of Cosmetics and Pharmaceutics, Daegu Haany University, Gyeongsan, South Korea
| | - Jae-Kwang Jung
- Department of Oral Medicine, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
| | - Jung-Hong Ha
- Department of Conservative Dentistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, South Korea
- *Correspondence: Jae-Young Kim, , orcid.org/0000-0002-6752-5683; Jung-Hong Ha, , orcid.org/0000-0002-0469-4324
| | - Jae-Young Kim
- Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea
- *Correspondence: Jae-Young Kim, , orcid.org/0000-0002-6752-5683; Jung-Hong Ha, , orcid.org/0000-0002-0469-4324
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Khurshid Z, Alnaim AJA, Alhashim AAA, Imran E, Adanir N. Future of Decellularized Dental Pulp Matrix in Regenerative Endodontics. Eur J Dent 2022; 16:737-741. [PMID: 34991166 DOI: 10.1055/s-0041-1741012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
With the advancements in tissue engineering, the repair and regeneration of oral/dental tissue are becoming possible and productive. Due to periodontal diseases, the tooth loses bone support resulting in tooth loss, but bone grafting stabilizes with new bone. It is seen that due to the progression of dental caries, pulp damage happens, and the vitality of the tooth is compromised. The current theme of dental pulp regeneration through biological and synthetic scaffolds, is becoming a potential therapy for pulp revitalization.
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Affiliation(s)
- Zohaib Khurshid
- Department of Prosthodontics and Dental Implantology, College of Dentistry, King Faisal University, Al-Ahsa, Kingdom of Saudi Arabia
| | | | | | - Eisha Imran
- Department of Dental Materials, HITEC Dental College, Institute of Medical Sciences, Taxilla, Pakistan
| | - Necdet Adanir
- Department of Restorative Dentistry, College of Dentistry, King Faisal University, Al-Ahsa, Kingdom of Saudi Arabia
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7
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Yamauchi Y, Cooper PR, Shimizu E, Kobayashi Y, Smith AJ, Duncan HF. Histone Acetylation as a Regenerative Target in the Dentine-Pulp Complex. Front Genet 2020; 11:1. [PMID: 32117431 PMCID: PMC7016267 DOI: 10.3389/fgene.2020.00001] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 01/06/2020] [Indexed: 01/09/2023] Open
Abstract
If dental caries (or tooth decay) progresses without intervention, the infection will advance through the dentine leading to severe pulpal inflammation (irreversible pulpitis) and pulp death. The current management of irreversible pulpits is generally root-canal-treatment (RCT), a destructive, expensive, and often unnecessary procedure, as removal of the injurious stimulus alone creates an environment in which pulp regeneration may be possible. Current dental-restorative-materials stimulate repair non-specifically and have practical limitations; as a result, opportunities exist for the development of novel therapeutic strategies to regenerate the damaged dentine-pulp complex. Recently, epigenetic modification of DNA-associated histone ‘tails’ has been demonstrated to regulate the self-renewal and differentiation potential of dental-stem-cell (DSC) populations central to regenerative endodontic treatments. As a result, the activities of histone deacetylases (HDAC) are being recognised as important regulators of mineralisation in both tooth development and dental-pulp-repair processes, with HDAC-inhibition (HDACi) promoting pulp cell mineralisation in vitro and in vivo. Low concentration HDACi-application can promote de-differentiation of DSC populations and conversely, increase differentiation and accelerate mineralisation in DSC populations. Therapeutically, various HDACi solutions can release bioactive dentine-matrix-components (DMCs) from the tooth’s extracellular matrix; solubilised DMCs are rich in growth factors and can stimulate regenerative processes such as angiogenesis, neurogenesis, and mineralisation. The aim of this mini-review is to discuss the role of histone-acetylation in the regulation of DSC populations, while highlighting the importance of HDAC in tooth development and dental pulp regenerative-mineralisation processes, before considering the potential therapeutic application of HDACi in targeted biomaterials to the damaged pulp to stimulate regeneration.
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Affiliation(s)
- Yukako Yamauchi
- Division of Restorative Dentistry & Periodontology, Dublin Dental University Hospital, Trinity College Dublin, University of Dublin, Dublin, Ireland
| | - Paul Roy Cooper
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Emi Shimizu
- Oral Biology Department, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Yoshifumi Kobayashi
- Oral Biology Department, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Anthony J Smith
- Oral Biology, School of Dentistry, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Henry Fergus Duncan
- Division of Restorative Dentistry & Periodontology, Dublin Dental University Hospital, Trinity College Dublin, University of Dublin, Dublin, Ireland
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8
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Mounir MMF, Rashed FM, Bukhary SM. Regeneration of Neural Networks in Immature Teeth with Non-Vital Pulp Following a Novel Regenerative Procedure. Int J Stem Cells 2019; 12:410-418. [PMID: 31658509 PMCID: PMC6881045 DOI: 10.15283/ijsc19026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 07/17/2019] [Accepted: 08/22/2019] [Indexed: 11/24/2022] Open
Abstract
Background and Objectives Recombinant amelogenin protein (RAP) was reported to induce soft-tissue regeneration in canine infected endodontically treated permanent teeth with open apices. To characterize identities of the cells found in the RAP regenerated tissues compared to authentic pulp by identifying: 1) stem cells by their expression of Sox2; 2) nerve fibers by distribution of the axonal marker peripherin; 3) axons by their expression of calcitonin gene–related peptide (CGRP); 4) the presence of astrocytes expressing glial fibrillary acidic proteins (GFAP). Methods A total of 240 open-apex root canals in dogs were used. After establishment of oral contamination to the pulp, the canals were cleaned, irrigated, and 120 canals filled with RAP, and the other 120 with calcium hydroxide. Results After 1, 3, and 6 months, teeth were recovered for immune-detection of protein markers associated with native pulp tissues. Regenerated pulp and apical papilla of RAP group revealed an abundance of stem cells showing intense immunoreactivity to Sox2 antibody, immunoreactivity of peripherin mainly in the A-fibers of the odontoblast layer and immunoreactivity to CGRP fibers in the central pulp region indicative of C-fibres. GFAP immunoreactivity was observed near the odontoblastic, cell-rich regions and throughout the regenerated pulp. Conclusions RAP induces pulp regeneration following regenerative endodontic procedures with cells identity by gene expression demonstrating a distribution pattern similar to the authentic pulp innervation. A- and C-fibers, as well as GFAP specific to astrocytic differentiation, are recognized. The origin of the regenerated neural networks may be derived from the Sox2 identified stem cells within the apical papilla.
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Affiliation(s)
- Maha M F Mounir
- Department of Oral Diagnostic Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.,Faculty of Dentistry, Alexandria University, Alexadria, Egypt
| | - Fatma M Rashed
- Department of Oral Biology, Faculty of Dentistry, Damanhour University, Damanhour, Egypt
| | - Sahar M Bukhary
- Department of Oral Biology, King Abdulaziz University, Faculty of Dentistry, Jeddah, Saudi Arabia
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9
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Bjørndal L, Simon S, Tomson PL, Duncan HF. Management of deep caries and the exposed pulp. Int Endod J 2019; 52:949-973. [PMID: 30985944 DOI: 10.1111/iej.13128] [Citation(s) in RCA: 186] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/10/2019] [Indexed: 01/12/2023]
Abstract
Caries prevalence remains high throughout the world, with the burden of disease increasingly affecting older and socially disadvantaged groups in Western cultures. If left untreated, caries will advance through dentine stimulating pulpitis and eventually pulp infection and necrosis; however, if conservatively managed, pulpal recovery occurs even in deep carious lesions. Traditionally, deep caries management was destructive with nonselective (complete) removal of all carious dentine; however, the promotion of minimally invasive biologically based treatment strategies has been advocated for selective (partial) caries removal and a reduced risk of pulp exposure. Selective caries removal strategies can be one-visit as indirect pulp treatment or two-visit using a stepwise approach. Management strategies for the treatment of the cariously exposed pulp are also shifting with avoidance of pulpectomy and the re-emergence of vital pulp treatment (VPT) techniques such as partial and complete pulpotomy. These changes stem from an improved understanding of the pulp-dentine complex's defensive and reparative response to irritation, with harnessing the release of bioactive dentine matrix components and careful handling of the damaged tissue considered critical. Notably, the development of new pulp capping materials such as mineral trioxide aggregate, which although not an ideal material, has resulted in more predictable treatments from both a histological and a clinical perspective. Unfortunately, the changes in management are only supported by relatively weak evidence with case series, cohort studies and preliminary studies containing low patient numbers forming the bulk of the evidence. As a result, critical questions related to the superiority of one caries removal technique over another, the best pulp capping biomaterial or whether pulp exposure is a negative prognostic factor remain unanswered. There is an urgent need to promote minimally invasive treatment strategies in Operative Dentistry and Endodontology; however, the development of accurate diagnostic tools, evidence-based management strategies and education in management of the exposed pulp are critical in the future.
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Affiliation(s)
- L Bjørndal
- Cariology and Endodontics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - S Simon
- Paris Diderot University, Paris, France.,Hôpital de Rouen Normandie, Rouen, France.,Laboratoire IN SERM UMR 1138, Paris, France
| | - P L Tomson
- School of Dentistry, Institute of Clinical Sciences, Birmingham, UK
| | - H F Duncan
- Division of Restorative Dentistry & Periodontology, Trinity College Dublin, Dublin Dental University Hospital, Dublin, Ireland
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10
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Angelova Volponi A, Zaugg LK, Neves V, Liu Y, Sharpe PT. Tooth Repair and Regeneration. CURRENT ORAL HEALTH REPORTS 2018; 5:295-303. [PMID: 30524931 PMCID: PMC6244610 DOI: 10.1007/s40496-018-0196-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
PURPOSE OF REVIEW Current dental treatments are based on conservative approaches, using inorganic materials and appliances.This report explores and discusses the newest achievements in the field of "regenerative dentistry," based on the concept of biological repair as an alternative to the current conservative approach. RECENT FINDINGS The review covers and critically analyzes three main approaches of tooth repair: the re-mineralization of the enamel, the biological repair of dentin, and whole tooth engineering. SUMMARY The development of a concept of biological repair based on the role of the Wnt signaling pathway in reparative dentin formation offers a new translational approach into development of future clinical dental treatments.In the field of bio-tooth engineering, the current focus of the researchers remains the establishment of odontogenic cell-sources that would be viable and easily accessible for future bio-tooth engineering.
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Affiliation(s)
- Ana Angelova Volponi
- Centre for Craniofacial and Regenerative Biology, Dental Institute, King’s College London, London, UK
| | - Lucia K. Zaugg
- Centre for Craniofacial and Regenerative Biology, Dental Institute, King’s College London, London, UK
- Department of Periodontology, Endodontology and Cariology, University Center for Dental Medicine Basel, University of Basel, Basel, Switzerland
| | - Vitor Neves
- Centre for Craniofacial and Regenerative Biology, Dental Institute, King’s College London, London, UK
| | - Yang Liu
- Centre for Craniofacial and Regenerative Biology, Dental Institute, King’s College London, London, UK
| | - Paul T. Sharpe
- Centre for Craniofacial and Regenerative Biology, Dental Institute, King’s College London, London, UK
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11
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Alqahtani Q, Zaky SH, Patil A, Beniash E, Ray H, Sfeir C. Decellularized Swine Dental Pulp Tissue for Regenerative Root Canal Therapy. J Dent Res 2018; 97:1460-1467. [PMID: 30067420 DOI: 10.1177/0022034518785124] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In the current theme of dental pulp regeneration, biological and synthetic scaffolds are becoming a potential therapy for pulp revitalization. The goal is to provide a suitable environment for cellular infiltration, proliferation, and differentiation. The extracellular matrix (ECM) represents a natural scaffold material resembling the native tissue chemical and mechanical properties. In the past few years, ECM-based scaffolds have shown promising results in terms of progenitor cells recruitment, promotion of constructive remodeling, and modulation of host response. These properties make ECM-derived scaffolds an ideal candidate for pulp regenerative therapy. Development of strategies for clinically relevant tissue engineering using dental pulp extracellular matrix (DP-ECM) can provide an alternative to conventional root canal treatment. In this work, we successfully decellularized ECM derived from porcine dental pulp. The resulting scaffold was characterized using immunostaining (collagen type I, dentin matrix protein 1, dentin sialoprotein, and Von Willebrand factor) and enzyme-linked immunosorbent assay (transforming growth factor β, vascular endothelial growth factor, and basic fibroblast growth factor) for extracellular proteins where the ECM retained its proteins and significant amount of growth factors. Furthermore, a pilot in vivo study was conducted where the matrix was implanted for 8 wk in a dog root canal model. Our in vitro and preliminary in vivo data show that the decellularized ECM supports cellular infiltration together with the expression of pulp-dentin and vascular markers (DSP and CD31) compared to the controls. Herein, we show the feasibility to produce a decellularized ECM scaffold and validate the concept of using ECM-based scaffolds for pulp regeneration.
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Affiliation(s)
- Q Alqahtani
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - S H Zaky
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,2 Department of Restorative Dentistry, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,3 Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - A Patil
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - E Beniash
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,3 Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,4 McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - H Ray
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,4 McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,5 Department of Endodontics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - C Sfeir
- 1 Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,3 Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,4 McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
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12
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da Rosa WLO, Piva E, da Silva AF. Disclosing the physiology of pulp tissue for vital pulp therapy. Int Endod J 2018; 51:829-846. [DOI: 10.1111/iej.12906] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 01/30/2018] [Indexed: 12/23/2022]
Affiliation(s)
- W. L. O. da Rosa
- Department of Restorative Dentistry; School of Dentistry; Federal University of Pelotas; Pelotas Brazil
| | - E. Piva
- Department of Restorative Dentistry; School of Dentistry; Federal University of Pelotas; Pelotas Brazil
| | - A. F. da Silva
- Department of Restorative Dentistry; School of Dentistry; Federal University of Pelotas; Pelotas Brazil
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13
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Janjić K, Cvikl B, Kurzmann C, Moritz A, Agis H. Do hypoxia and L-mimosine modulate sclerostin and dickkopf-1 production in human dental pulp-derived cells? Insights from monolayer, spheroid and tooth slice cultures. BMC Oral Health 2018. [PMID: 29523112 PMCID: PMC5845180 DOI: 10.1186/s12903-018-0492-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Background To understand the responses of the dental pulp to hypoxia is of high relevance for regenerative endodontics and dental traumatology. Here, we aimed to reveal the effects of hypoxia and the hypoxia mimetic agent L-mimosine (L-MIM) on the production of sclerostin (SOST) and dickkopf-1 (DKK-1) in human dental pulp-derived cells (DPC). Methods DPC in monolayer, spheroid and tooth slice cultures were treated with L-MIM or hypoxia. Resazurin-based toxicity and MTT assays were performed to determine cell viability. mRNA and protein levels of SOST and DKK-1 were measured with quantitative reverse transcription PCR and ELISA, respectively. To validate the hypoxia-like response, SDF-1, VEGF and IL-8 were assessed. In addition Western blots for HIF-1α, HIF-2α and HIF-3α were done. Results Cells were vital upon treatment procedures and showed increased levels of HIF-1α, and HIF-2α. In monolayer cultures, mRNA levels of SOST and DKK-1 were downregulated by L-MIM and hypoxia, respectively. A significant downregulation of SOST by hypoxia was found at the protein level compared to untreated cells while the effect on DKK-1 and the impact of L-MIM on SOST and DKK-1 did not reach the level of significance at the protein level. In spheroid cultures, mRNA levels of SOST and DKK-1 were downregulated by L-MIM. A significant downregulation of DKK-1 upon hypoxia treatment was found at the protein level while the impact of hypoxia on SOST and the effect of L-MIM on SOST and DKK-1 did not reach the level of significance. SOST and DKK-1 were also produced in tooth slices, but no pronounced modulation by L-MIM or hypoxia was found. Evaluation of SDF-1, VEGF and IL-8 showed a hypoxia-like response in the culture models. Conclusions There is no pronounced influence of hypoxia and L-MIM on DPC viability, SOST and DKK-1 protein production. However, the specific response depends on the culture model and the level of evaluation (mRNA or protein). These results deepen our understanding about the role of hypoxia and the potential impacts of hypoxia-based strategies on dental pulp.
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Affiliation(s)
- Klara Janjić
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, Vienna, 1200, Austria
| | - Barbara Cvikl
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, Vienna, 1200, Austria.,Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse 7, Bern, 3010, Switzerland
| | - Christoph Kurzmann
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, Vienna, 1200, Austria
| | - Andreas Moritz
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, Vienna, 1200, Austria
| | - Hermann Agis
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria. .,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, Vienna, 1200, Austria.
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14
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Abstract
During the treatment of dental caries that has not penetrated the tooth pulp, maintenance of as much unaffected dentine as possible is a major goal during the physical removal of decayed mineral. Damage to dentine leads to release of fossilized factors (transforming growth factor-β [TGF-β] and bone morphogenic protein [BMP]) in the dentine that are believed to stimulate odontoblasts to secrete new "tertiary" dentine (reactionary dentine). This is formed on the pulpal surface of existing dentine and rethickens the dentine. We have previously shown that activation of Wnt/β-catenin signaling is pivotal for tooth repair in exposed pulp injury, and the pathway can be activated by small-molecule GSK-3 antagonists, resulting in enhanced reparative dentine formation. Here, we use a nonexposed pulp injury model to investigate the mechanisms of reactionary dentine formation in vivo, using small molecules to modulate the Wnt/β-catenin, TGF-β, and BMP pathways. We found that a local increase of Wnt activation at the injury site enhances reactionary dentine secretion. In addition, inhibition of TGF-β, BMP, or Wnt pathways does not impede reactionary dentine formation, although inhibition of TGF-β and/or BMP signaling does result in more disorganized, nontubular reactionary dentine. This suggests that Wnt/β-catenin signaling plays no major role in the formation of reactionary dentine, but in common with reparative dentine formation, exogenous elevation of Wnt/β-catenin signaling can enhance tertiary dentine formation. Release of latent TGF-β or BMPs from dentine is not required for the deposition of mineral to form reactionary dentine but does play a role in its organization.
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Affiliation(s)
- V C M Neves
- 1 Centre for Craniofacial and Regenerative Biology, Dental Institute, Kings College London, UK
| | - P T Sharpe
- 1 Centre for Craniofacial and Regenerative Biology, Dental Institute, Kings College London, UK
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15
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Abstract
Apical revascularization (AR) and platelet-rich plasma have been used to restore dental pulp vitality in infected immature permanent teeth. Two regenerative therapies are cell transplantation and cell homing. This article updates and benchmarks these therapies with cell homing. A case report concluded that AR increased root length; however, quantitative and statistical assessments disproved this. Regenerative endodontic therapies require prospective clinical trials demonstrating safety and efficacy. These therapies are intrinsically susceptible to procedural and patient variations. Cell homing uses novel molecules that drive therapeutic efficacy, and may be less sensitive to procedural and patient variations.
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Affiliation(s)
- Ling He
- Division of Endodontics, Center for Craniofacial Regeneration, Columbia University Medical Center, Columbia University, 630 West 168 Street, New York, NY 10032, USA; Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuan West Road, Guangzhou, Guangdong, 510055, China
| | - Juan Zhong
- Division of Endodontics, Center for Craniofacial Regeneration, Columbia University Medical Center, Columbia University, 630 West 168 Street, New York, NY 10032, USA
| | - Qimei Gong
- Division of Endodontics, Center for Craniofacial Regeneration, Columbia University Medical Center, Columbia University, 630 West 168 Street, New York, NY 10032, USA; Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuan West Road, Guangzhou, Guangdong, 510055, China
| | - Bin Cheng
- Department of Biostatistics, Columbia University Mailman School of Public Health, 722 West 168th Street, Room 631, New York, NY 10032, USA.
| | - Sahng G Kim
- Division of Endodontics, Center for Craniofacial Regeneration, Columbia University Medical Center, College of Dental Medicine, Columbia University, 630 West 168 Street - PH7Stem #128, New York, NY 10032, USA.
| | - Junqi Ling
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuan West Road, Guangzhou, Guangdong, 510055, China.
| | - Jeremy J Mao
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuan West Road, Guangzhou, Guangdong, 510055, China; Division of Endodontics, Center for Craniofacial Regeneration, Columbia University Medical Center, Columbia University, 630 West 168 Street - PH7E, New York, NY 10032, USA.
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16
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Lucisano MP, Nelson-Filho P, Silva LAB, Silva RAB, de Carvalho FK, de Queiroz AM. Apical Revascularization after Delayed Tooth Replantation: An Unusual Case. Case Rep Dent 2016; 2016:2651643. [PMID: 27882250 PMCID: PMC5110882 DOI: 10.1155/2016/2651643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/19/2016] [Accepted: 10/17/2016] [Indexed: 01/09/2023] Open
Abstract
The aim of this paper is to present the clinical and radiological outcome of the treatment involving a delayed tooth replantation after an avulsed immature permanent incisor, with a follow-up of 1 year and 6 months. An 8-year-old boy was referred after dental trauma that occurred on the previous day. The permanent maxillary right central incisor (tooth 11) had been avulsed. The tooth was hand-held during endodontic therapy and an intracanal medication application with calcium hydroxide-based paste was performed. An apical plug with mineral trioxide aggregate (MTA) was introduced into the apical portion of the canal. When the avulsed tooth was replanted with digital pressure, a blood clot had formed within the socket, which moved the MTA apical plug about 2 mm inside of the root canal. These procedures developed apical revascularization, which promoted a successful endodontic outcome, evidenced by apical closure, slight increase in root length, and absence of signs of external root resorption, during a follow-up of 1 year and 6 months.
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Affiliation(s)
- Marília Pacífico Lucisano
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Paulo Nelson-Filho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Lea Assed Bezerra Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Raquel Assed Bezerra Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Fabricio Kitazono de Carvalho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Alexandra Mussolino de Queiroz
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
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17
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Dianat O, Mashhadi Abas F, Paymanpour P, Eghbal MJ, Haddadpour S, Bahrololumi N. Endodontic repair in immature dogs' teeth with apical periodontitis: blood clot vs plasma rich in growth factors scaffold. Dent Traumatol 2016; 33:84-90. [DOI: 10.1111/edt.12306] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2016] [Indexed: 12/28/2022]
Affiliation(s)
- Omid Dianat
- Iranian Center for Endodontic Research; Research Institute of Dental Science; Endodontic Department; School of Dentistry; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Fatemeh Mashhadi Abas
- Pathology Department; Dental School; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Payam Paymanpour
- Endodontic Department; School of Dentistry; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Mohammad Jafar Eghbal
- Iranian Center for Endodontic Research; Research Institute of Dental Sciences Endodontic Department; Dental School; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Sahar Haddadpour
- Orthodontic Department; Dental School; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Nazanin Bahrololumi
- Research Institute of Dental Sciences; Dental School; Shahid Beheshti University of Medical Sciences; Tehran Iran
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18
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Duncan HF, Smith AJ, Fleming GJP, Reid C, Smith G, Cooper PR. Release of bio-active dentine extracellular matrix components by histone deacetylase inhibitors (HDACi). Int Endod J 2016; 50:24-38. [PMID: 26609946 DOI: 10.1111/iej.12588] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 11/19/2015] [Indexed: 01/24/2023]
Abstract
AIM To characterize dentine matrix component (DMC) release and smear layer removal by histone deacetylase inhibitors (HDACis). METHODOLOGY DMCs were extracted from powdered human dentine over 14 days using three HDACis, valproic acid (VPA), trichostatin A (TSA) and suberoylanilide hydroxamic acid (SAHA) and compared with a control extractant, 10% (w/v) EDTA. Protein compositions of the resultant extracts were analysed by 1D-polyacrylamide gel electrophoresis (1D-PAGE), TGF-β-1 and MMP-9 ELISAs and a high-throughput growth factor antibody array. Dentine discs with a standardized smear layer were prepared from human molars and treated with EDTA (17% w/v), polyacrylic acid (PA) (20% v/v) and the experimental HDACis prior to analysis by scanning electron microscopy. Parametric ELISA data were analysed using one-way anova and Tukey's post hoc test, whilst nonparametric smear layer data were analysed by Kruskal-Wallis test and Mann-Whitney U-test (P < 0.05). RESULTS HDACis did not remove smear layer in the presence or absence of PA pre-treatment (P ≥ 0.478). 1D-PAGE analysis demonstrated different protein profiles for EDTA and HDACi extracts. All HDACi solutions released TGF-β-1 although less effectively than EDTA (P < 0.001), whilst MMP-9 was extracted in significantly higher concentration by EDTA and VPA compared with TSA (P < 0.012). Antibody array analysis demonstrated the ability of HDACis to extract a complex cocktail of established/novel growth factors from dentine, albeit significantly less efficiently than EDTA for certain cytokines (TGF-β-1, PDGF-AA, VEGF-A) and significantly more effectively for others (GDF-15, IGF-1, EGRF-1, NGFR, BDNF, SCF-R). CONCLUSIONS HDACi release a range of bioactive DMCs that could promote dentine repair processes in vivo; however, they are ineffective at removing smear layer.
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Affiliation(s)
- H F Duncan
- Division of Restorative Dentistry & Periodontology, Dublin Dental University Hospital, Trinity College Dublin, Dublin, Ireland
| | - A J Smith
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK
| | - G J P Fleming
- Material Science Unit, Dublin Dental University Hospital, Trinity College Dublin, Dublin, Ireland
| | - C Reid
- Centre for Microscopy and Analysis, Trinity College Dublin, Dublin, Ireland
| | - G Smith
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK
| | - P R Cooper
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK
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19
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Smith AJ, Duncan HF, Diogenes A, Simon S, Cooper PR. Exploiting the Bioactive Properties of the Dentin-Pulp Complex in Regenerative Endodontics. J Endod 2016; 42:47-56. [DOI: 10.1016/j.joen.2015.10.019] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 10/29/2015] [Accepted: 10/29/2015] [Indexed: 02/06/2023]
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20
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Kamocki K, Nör JE, Bottino MC. Dental pulp stem cell responses to novel antibiotic-containing scaffolds for regenerative endodontics. Int Endod J 2015; 48:1147-56. [PMID: 25425048 PMCID: PMC4442767 DOI: 10.1111/iej.12414] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 11/20/2014] [Indexed: 11/30/2022]
Abstract
AIM To evaluate both the drug-release profile and the effects on human dental pulp stem cells' (hDPSC) proliferation and viability of novel bi-mix antibiotic-containing scaffolds intended for use as a drug delivery system for root canal disinfection prior to regenerative endodontics. METHODOLOGY Polydioxanone (PDS)-based fibrous scaffolds containing both metronidazole (MET) and ciprofloxacin (CIP) at selected ratios were synthesized via electrospinning. Fibre diameter was evaluated based on scanning electron microscopy (SEM) images. Pure PDS scaffolds and a saturated CIP/MET solution (i.e. 50 mg of each antibiotic in 1 mL) (hereafter referred to as DAP) served as both negative (nontoxic) and positive (toxic) controls, respectively. High-performance liquid chromatography (HPLC) was performed to investigate the amount of drug(s) released from the scaffolds. WST-1(®) proliferation assay was used to evaluate the effect of the scaffolds on cell proliferation. LIVE/DEAD(®) assay was used to qualitatively assess cell viability. Data obtained from drug release and proliferation assays were statistically analysed at the 5% significance level. RESULTS A burst release of CIP and MET was noted within the first 24 h, followed by a sustained maintenance of the drug(s) concentration for 14 days. A concentration-dependent trend was noticed upon hDPSCs' exposure to all CIP-containing scaffolds, where increasing the CIP concentration resulted in reduced cell proliferation (P < 0.05) and viability. In groups exposed to pure MET or pure PDS scaffolds, no changes in proliferation were observed. CONCLUSIONS Synthesized antibiotic-containing scaffolds had significantly lower effects on hDPSCs proliferation when compared to the saturated CIP/MET solution (DAP).
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Affiliation(s)
- K Kamocki
- Department of Restorative Dentistry, Division of Dental Biomaterials, Indiana University School of Dentistry (IUSD), Indianapolis, IN, USA
| | - J E Nör
- Department of Cariology, Restorative Sciences and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - M C Bottino
- Department of Restorative Dentistry, Division of Dental Biomaterials, Indiana University School of Dentistry (IUSD), Indianapolis, IN, USA
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21
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Chaniotis A. The use of a single-step regenerative approach for the treatment of a replanted mandibular central incisor with severe resorption. Int Endod J 2015. [DOI: 10.1111/iej.12515] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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22
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Bansal R, Jain A, Mittal S, Kumar T, Kaur D. Regenerative endodontics: a road less travelled. J Clin Diagn Res 2014; 8:ZE20-4. [PMID: 25478476 DOI: 10.7860/jcdr/2014/8257.5034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 05/08/2014] [Indexed: 01/12/2023]
Abstract
Although traditional approaches like root canal therapy and apexification procedures have been successful in treating diseased or infected root canals, but these modalities fail to re-establish healthy pulp tissue in treated teeth. Regeneration-based approaches aims to offer high levels of success by replacing diseased or necrotic pulp tissues with healthy pulp tissue to revitalize teeth. The applications of regenerative approaches in dental clinics have potential to dramatically improve patients' quality of life. This review article offers a detailed overview of present regenerative endodontic approaches aiming to revitalize teeth and also outlines the problems to be dealt before this emerging field contributes to clinical treatment protocols. It conjointly covers the basic trilogy elements of tissue engineering.
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Affiliation(s)
- Ramta Bansal
- Senior lecturer, Department of Conservative Dentistry and Endodontics, Institute of Dental Sciences , Sehora, Jammu, India
| | - Aditya Jain
- Lecturer, Department of Physiology, Government Medical College , Patiala, Punjab, India
| | - Sunandan Mittal
- Professor and Head, Department of Conservative Dentistry and Endodontics, Dasmesh Institute of Research and Dental Sciences , Faridkot, Punjab, India
| | - Tarun Kumar
- Professor, Department of Conservative Dentistry and Endodontics, Dasmesh Institute of Research and Dental Sciences , Faridkot, Punjab, India
| | - Dilpreet Kaur
- Senior Lecturer, Department of Conservative Dentistry and Endodontics, Bhojia Dental College & Hospital (Baddi) , Himachal Pradesh, India
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23
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McCabe P. Revascularization of an immature tooth with apical periodontitis using a single visit protocol: a case report. Int Endod J 2014; 48:484-97. [DOI: 10.1111/iej.12344] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 07/23/2014] [Indexed: 01/30/2023]
Affiliation(s)
- P. McCabe
- The Oranhill Dental Suite; Oranmore, Co.; Galway Ireland
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24
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Ricucci D, Loghin S, Lin LM, Spångberg LSW, Tay FR. Is hard tissue formation in the dental pulp after the death of the primary odontoblasts a regenerative or a reparative process? J Dent 2014; 42:1156-70. [PMID: 25008021 DOI: 10.1016/j.jdent.2014.06.012] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 05/19/2014] [Accepted: 06/30/2014] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVES Conceptually, two types of tertiary dentine may be produced in response to caries and environmental irritations: "reactionary dentine" that is secreted by existing primary odontoblasts and "reparative dentine", formed after the death of the odontoblasts by proliferation and differentiation of progenitor cells into odontoblast-like cells. Because histologic evidence for tubular dentine generated by newly differentiated odontoblast-like cells is lacking in human teeth, the present study examined pulpal cellular changes associated with caries/restorations, in the presence or absence of pulpal exposures. METHODS Ninety-six extracted human teeth were histologically processed and serial sectioned for light microscopy: 65 contained untreated enamel/dentine caries; 20 were heavily restored and 11 had carious exposures managed by direct pulp-capping. RESULTS Sparsely distributed, irregularly arranged dentinal tubules were identified from the tertiary dentine formed in teeth with unexposed medium/deep caries and in restored teeth; those tubules were continuous with the tubules of secondary dentine; in some cases, tubules were absent. The palisade odontoblast layer was reduced to a single layer of flattened cells. In direct pulp-capping of pulp exposures, the defects were repaired by the deposition of an amorphous dystrophic calcified tissue that resembled pulp stones more than dentine, sometimes entrapping pulpal remnants. This atubular hard tissue was lined by fibroblasts and collagen fibrils. CONCLUSIONS Histological evidence from the present study indicates that reparative dentinogenesis cannot be considered as a regenerative process since the so-formed hard tissue lacks tubular features characteristic of genuine dentine. Rather, this process represents a repair response that produces calcified scar tissues by pulpal fibroblasts. CLINICAL SIGNIFICANCE Formation of hard tissue in the dental pulp after the death of the primary odontoblasts has often been regarded by clinicians as regeneration of dentine. If the objective of the clinical procedures involved is to induce healing, reduce dentine hypersensitivity, or minimise future bacteria exposure, such procedures may be regarded as clinical success. However, current clinical treatment procedures are not adept at regenerating physiological dentne because the tissues formed in the dental pulp are more likely the result of repair responses via the formation of calcified scar tissues.
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Affiliation(s)
| | | | - Louis M Lin
- Department of Endodontics, New York University, New York, USA
| | - Larz S W Spångberg
- Division of Endodontology, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Franklin R Tay
- Department of Endodontics, College of Dental Medicine, Georgia Regents University, Augusta, GA, USA.
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25
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What BDJ readers were reading spring 2014. Br Dent J 2014. [DOI: 10.1038/sj.bdj.2014.421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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