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Najeeb S, Manekia FA, Sadiq MSK, Adanir N, Khurshid Z, Zafar MS, Heboyan A. The effect of fibroblast growth factor-2 on the outcomes of tooth replantation: A systematic review of animal studies. Sci Prog 2024; 107:368504241228964. [PMID: 38489928 PMCID: PMC10943733 DOI: 10.1177/00368504241228964] [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: 03/17/2024]
Abstract
Background/Aim: The ideal treatment of tooth avulsion is replantation. However, replanting teeth may lead to root resorption. Fibroblast growth factor-2 (FGF-2) is a cytokine that plays an important role in wound repair and tissue regeneration. Recently, FGF-2 has been studied a potential regenerative agent to prevent root resorption and ankylosis. The aim of this review is to analyze and summarize the currently available literature focusing on using FGF-2 based regenerative modalities to improve the outcomes of tooth replantation. Materials and Methods: An electronic search was conducted via PubMed/Medline, Google Scholar and ISI Web of Knowledge, using the Medical Subject Headings (MeSH) terms "Basic fibroblast growth factor," "Fibroblast growth factor-2," "tooth replantation," and "replantation" for studies published between January 2001 and June 2021. Data was extracted and quality assessment was carried using the ARRIVE guidelines. Results: Nine animal studies were included in this review. In six studies, FGF-2 had a favorable effect on the tissue regeneration around roots of replanted teeth when compared to other treatment groups. However, quality assessment of the studies revealed many sources of bias and deficiencies in the studies. Conclusions: Within the limitations of this study, it may be concluded that FGF-2 may improve the outcomes of delayed replantation of avulsed teeth. However, more long-term animal studies, with improved experimental designs, and clinical trials are required to determine the clinical potential of the growth factor in improving the outcomes of delayed tooth replantation.
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Affiliation(s)
- Shariq Najeeb
- Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
- Evidentia Dental Outcomes Research, Calgary, AB, Canada
| | | | - Muhammad Shahrukh Khan Sadiq
- Department of Oral Pathology, Bahria University Dental College, Bahria University Health Ciences, Karachi, Pakistan
| | - Necdet Adanir
- Department of Restorative Dentistry, College of Dentistry, King Faisal University, Al-Ahsa, Kingdom of Saudi Arabia
| | - Zohaib Khurshid
- Department of Prosthodontics and Dental Implantology, College of Dentistry, King Faisal University, Kingdom of Saudi Arabia
- Current affiliation: Center of Excellence for Regenerative Dentistry, Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Muhammad Sohail Zafar
- Department of Restorative Dentistry, College of Dentistry, Taibah University, Al Madina Al Munawwarrah, Saudi Arabia
- School of Dentistry, University of Jordan, Amman, Jordan
- Department of Dental Materials, Islamic International Dental College, Riphah International University, Islamabad, Pakistan
- Current affiliation: Centre of Medical and Bio-allied Health Sciences Research, Ajman University, Ajman, Ajman, 346, United Arab Emirates
| | - Artak Heboyan
- Department of Prosthodontics, Faculty of Stomatology, Yerevan State Medical University after Mkhitar Heratsi, Str. Koryun 2, Yerevan, Armenia
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Ideno H, Komatsu K, Nakashima K, Nifuji A. Tooth transplantation and replantation: Biological insights towards therapeutic improvements. Genesis 2022; 60:e23496. [PMID: 35916605 DOI: 10.1002/dvg.23496] [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: 04/10/2022] [Revised: 06/10/2022] [Accepted: 06/18/2022] [Indexed: 11/06/2022]
Abstract
Transplantation and replantation of teeth are effective therapeutic approaches for tooth repositioning and avulsion, respectively. Transplantation involves transplanting an extracted tooth from the original site into another site, regenerating tissue including the periodontal ligament (PDL) and alveolar bone, around the transplanted tooth. Replantation places the avulsed tooth back to its original site, regenerating functional periodontal tissue. In clinical settings, transplantation and replantation result in favorable outcomes with regenerated PDL tissue in many cases. However, they often result in poor outcomes with two major complications: tooth ankylosis and root resorption. In tooth ankylosis, the root surface and alveolar bone are fused, reducing the PDL tissue between them. The root is subjected to remodeling processes and is partially replaced by bone. In severe cases, the resorbed root is completely replaced by bone tissue, which is called as "replacement resorption." Resorption is sometimes accompanied by infection-mediated inflammation. The molecular mechanisms of ankylosis and root resorption remain unclear, although some signaling mechanisms have been proposed. In this mini-review, we summarized the biological basis of repair mechanisms of tissues in transplantation and replantation and the pathogenesis of their healing failure. We also discussed possible therapeutic interventions to improve treatment success rates.
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Affiliation(s)
- Hisashi Ideno
- Department of Pharmacology, School of Dental Medicine Tsurumi University, Yokohama, Japan
| | - Koichiro Komatsu
- Department of Pharmacology, School of Dental Medicine Tsurumi University, Yokohama, Japan
| | - Kazuhisa Nakashima
- Department of Pharmacology, School of Dental Medicine Tsurumi University, Yokohama, Japan
| | - Akira Nifuji
- Department of Pharmacology, School of Dental Medicine Tsurumi University, Yokohama, Japan
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Houg KP, Camarillo AM, Doschak MR, Major PW, Popowics T, Dennison CR, Romanyk DL. Strain Measurement within an Intact Swine Periodontal Ligament. J Dent Res 2022; 101:1474-1480. [PMID: 35689395 PMCID: PMC9605999 DOI: 10.1177/00220345221100234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The periodontal ligament (PDL) provides support, proprioception, nutrition, and protection within the tooth–PDL–bone complex (TPBC). While understanding the mechanical behavior of the PDL is critical, current research has inferred PDL mechanics from finite element models, from experimental measures on complete TPBCs, or through direct measurement of isolated PDL sections. Here, transducers are used in an attempt to quantify ex vivo PDL strain. In-fiber Bragg grating (FBG) sensors are small flexible sensors that can be placed within an intact TPBC and yield repeatable strain measurements from within the PDL space. The objective of this study was to determine: 1) if the FBG strain measured from the PDL space of intact swine premolars ex vivo was equivalent to physical PDL strains estimated through finite element analysis and 2) if a change in FBG strain could be linearly related to a change in finite element strain under variable tooth displacement, applied to an intact swine TPBC. Experimentally, individual TPBCs were subjected to 2 displacements (n = 14). The location of the FBG was determined from representative micro–computed tomography images. From a linear elastic finite element model of a TPBC, the strain magnitudes at the sensor locations were recorded. An experimental ratio (i.e., FBG strain at the first displacement divided by the FBG strain at the second displacement) and a finite element ratio (i.e., finite element strain at the first displacement divided by the finite element strain at the second displacement) were calculated. A linear regression model indicated a statistically significant relationship between the experimental and finite element ratio (P = 0.017) with a correlation coefficient (R2) of 0.448. It was concluded that the FBG sensor could be used as a measure for a change in strain and thus could be implemented in applications where the mechanical properties of an intact PDL are monitored over time.
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Affiliation(s)
- K P Houg
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada
| | - A M Camarillo
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada
| | - M R Doschak
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada
| | - P W Major
- School of Dentistry, University of Alberta, Edmonton, AB, Canada
| | - T Popowics
- Department of Oral Health Science, University of Washington, Seattle, WA, USA
| | - C R Dennison
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada
| | - D L Romanyk
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada.,School of Dentistry, University of Alberta, Edmonton, AB, Canada
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Khurshid Z, Asiri FYI, Najeeb S, Ratnayake J. The Impact of Autologous Platelet Concentrates on the Periapical Tissues and Root Development of Replanted Teeth: A Systematic Review. MATERIALS 2022; 15:ma15082776. [PMID: 35454469 PMCID: PMC9031947 DOI: 10.3390/ma15082776] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/06/2022] [Accepted: 04/07/2022] [Indexed: 02/06/2023]
Abstract
Introduction: In many cases, the replanted teeth may undergo resorption or ankyloses. Recent studies show that autologous platelet concentrates (APCs) may improve the outcomes of tooth replantation. The aim of this systematic review was to summarize and critically appraise the currently available literature on the use of APCs before tooth replantation. Methodology: An electronic search was conducted on the following research databases: PubMed/MEDLINE, ISI Web of Science, EMBASE and Scopus. The following medical subject heading (MeSH) keywords used were: ((tooth replantation) OR (replanted tooth) OR (teeth replantation) OR (replanted teeth)) AND ((autologous platelet concentrate) OR (platelet-rich plasma) OR (platelet-rich fibrin) OR (autologous platelet)). The studies’ data was extracted, and the research’ quality was rated using the CARE and ARRIVE protocols. Results: Ten case reports and three animal studies, one cell study and one study, which included both animal and in vitro experiments, were included in this review. In majority of the studies, APCs improved the outcomes of tooth replantation. However, there were various sources of bias in the most of the research, which may have influenced the results. Conclusions: Although majority of the studies indicate that APCs may improve outcomes of tooth replantation, majority of the studies contained numerous sources of bias. Additionally, the sample size of the included subjects is inadequate to predict the clinical efficacy of APCs in management of replanted teeth. Large-scale, multi-center and long-term studies are required to ascertain the efficacy of APCs in improve the outcomes of tooth replantation.
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Affiliation(s)
- Zohaib Khurshid
- Department of Prosthodontics and Dental Materials, School of Dentistry, King Faisal University, Al-Ahsa 31982, Saudi Arabia
- Correspondence: ; Tel.: +966-558420410
| | - Faris Yahya I. Asiri
- Department of Preventive Dentistry, College of Dentistry, King Faisal University, Al-Ahsa 31982, Saudi Arabia;
| | - Shariq Najeeb
- Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 3K7, Canada;
| | - Jithendra Ratnayake
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand;
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Komatsu K, Ideno H, Shibata T, Nakashima K, Nifuji A. Platelet-derived growth factor-BB regenerates functional periodontal ligament in the tooth replantation. Sci Rep 2022; 12:3223. [PMID: 35217688 PMCID: PMC8881622 DOI: 10.1038/s41598-022-06865-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 01/25/2022] [Indexed: 01/16/2023] Open
Abstract
Tooth ankylosis is a pathological condition of periodontal ligament (PDL) restoration after tooth replantation. Platelet-derived growth factor-BB (PDGF-BB) has been proposed as a promising factor for preventing tooth ankylosis. Using rat tooth replantation model, we investigated whether PDGF-BB accelerates the repair of PDL after tooth replantation without ankylosis, and its molecular mechanisms. In PDGF-BB pretreated replanted teeth (PDGF-BB group), ankylosis was markedly reduced and functionally organized PDL collagen fibers were restored; the mechanical strength of the healing PDL was restored to an average of 76% of that in non-replanted normal teeth at 21 days. The numbers of PDGF-Rβ- and BrdU-positive cells in the periodontal tissues of the PDGF-BB group were greater than those of atelocollagen pretreated replanted teeth (AC group). Moreover, in the PDGF-BB group, the periodontal tissues had fewer osteocalcin-positive cells and decreased number of nuclear β-catenin-positive cells compared to those in the AC group. In vitro analyses showed that PDGF-BB increased the proliferation and migration of human periodontal fibroblasts. PDGF-BB downregulated mRNA expressions of RUNX2 and ALP, and inhibited upregulatory effects of Wnt3a on β-catenin, AXIN2, RUNX2, COL1A1, and ALP mRNA expressions. These findings indicate that in tooth replantation, topical PDGF-BB treatment enhances cell proliferation and migration, and inhibits canonical Wnt signaling activation in bone-tooth ankylosis, leading to occlusal loading of the PDL tissues and subsequent functional restoration of the healing PDL. This suggests a possible clinical application of PDGF-BB to reduce ankylosis after tooth replantation and promote proper regeneration of PDL.
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Affiliation(s)
- Koichiro Komatsu
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan.
| | - Hisashi Ideno
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan.
| | - Tatsuya Shibata
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
- Division of Dental Pharmacology, Department of Oral Science, School of Dentistry, Oh-U University, 31-1 aza Sankakudoh, Tomita-machi, Kohriyama, 963-8611, Japan
| | - Kazuhisa Nakashima
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Akira Nifuji
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
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Validation of a new experimental model of extrusive luxation on maxillary molars of rats: a histological study. Clin Oral Investig 2017; 22:1985-1994. [PMID: 29214377 DOI: 10.1007/s00784-017-2288-7] [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: 11/28/2016] [Accepted: 11/21/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND/AIM The aim of this study was to test and validate a new model of extrusive luxation trauma on maxillary first molars of rats. MATERIAL AND METHODS Forty adult male rats (Rattus norvegicus albinus, Wistar; weight = 230-250 g), 45 days old, were divided into eight groups (n = 5): control groups, in which animals were not subjected to any procedure and waited 1 day (GC1D) or 3 days (GC3D) for euthanasia, and experimental groups, in which animals were subjected to forces of 1100cN, 1300cN, or 1500cN and waited 1 or 3 days for euthanasia (GT1100/1D, GT1100/3D, GT1300/1D, GT1300/3D, GT1500/1D, GT1500/3D). In animals of the experimental groups, trauma was produced by an extrusive force in maxillary first right molars. Four-micrometer serial cuts stained with hematoxylin and eosin (HE) were made. Descriptive microscopic analysis of first upper right molar and semi-quantitative analysis (scores 1 to 4) of intensity of acute and chronic inflammation and vascular changes in the periodontal ligament and active and inactive external root resorption were conducted. The distribution of scores in the groups was compared using the Freeman-Halton extension of Fisher's exact test. The significance level was 5%. RESULTS It was observed that vascular disorders (bleeding) on the periodontal ligament became more evident with increasing extrusive force. CONCLUSIONS This new method was capable of generating histological changes, proving its secure application in this research area. The 1500cN force produced more damage on the periodontal ligament. CLINICAL RELEVANCE The validation of a new experimental method can produce more reliable evidence in further research.
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Yoo JE, Kim MS, Kwon YD, Kim EC, Kim KC, Choi SC. Could zoledronic acid prevent root resorption in replanted rat molar? Dent Traumatol 2015; 31:465-70. [PMID: 26149469 DOI: 10.1111/edt.12202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND/AIM In this study, we evaluated whether zoledronate could suppress the progression of external root resorption in rat due to delayed replantation by inhibiting osteoclastic activity. Also, we estimated the optimal dosage of zoledronate in root treatment of the rat model for a maximum effect of zoledronate. MATERIAL AND METHODS Maxillary first molars in Sprague Dawley rats (N = 84) were extracted, dried for 60 min, and then replanted. The rats were divided into 6 groups (1 mM alendronate, and 1, 5, 10, 20, 40 μM zoledronate). At 4 and 8 weeks postreplantation, the animals were sacrificed and evaluated by radiographic and histological analysis. RESULTS AND CONCLUSION There were no significant differences at 4 weeks. However, at 8 weeks, 10, 20, and 40 μM ZOL showed more increased radiopaque and smaller periapical lesion in radiographic analysis. In histological analysis, all groups showed similar inflammatory root resorption rate at 4 weeks. However, at 8 weeks, 20 and 40 μM ZOL showed lower rate than those of other groups (P < 0.05). In concerning of replacement resorption, there were no significant differences statistically. In this animal experiment, zoledronate was capable of limiting the occurrence of root resorption in delayed replantation model. In particular, 20 μM dosage of zoledronate solution showed the most effective dose in long-term follow up and might be suitable for inhibition of root resorption in delayed tooth replantation.
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Affiliation(s)
- Jung Eun Yoo
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Yong-Dae Kwon
- Department of Maxillofacial Surgery, School of dentistry, Kyung Hee University, Seoul, Korea
| | - Eun-Cheol Kim
- Department of Maxillofacial Tissue Regeneration and Research Center for Tooth & Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Kwang Chul Kim
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital, Gangdong, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Inoue K, Hara Y, Sato T. Development of the oxytalan fiber system in the rat molar periodontal ligament evaluated by light- and electron-microscopic analyses. Ann Anat 2012; 194:482-8. [PMID: 22727934 DOI: 10.1016/j.aanat.2012.03.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 03/23/2012] [Accepted: 03/30/2012] [Indexed: 11/27/2022]
Abstract
In the elastic fiber system of the periodontal ligaments only oxytalan fibers can be identified, whereas all three types of fibers, oxytalan, elaunin and elastic fibers, are present in the gingiva. However, little information is available concerning their organization in the developing periodontal ligament. In the present study, growth and distribution of the oxytalan fiber system were examined in the developing periodontal ligament of rat molars using the specific staining for oxytalan, elastic and collagen fibers, and electron-microscopic analyses. Oxytalan staining clearly confirmed the earliest oxytalan fibers in a bell-staged tooth germ at embryonic day 18, which were tiny violet-colored fibers in the dental follicle. Their cross images were made up of dot-like microfibrils of 10-15nm in diameter close to fibroblasts in the dental follicle of the rat molars aged 1 day. These microfibrils appeared to be linked to one another through delicate filaments in 3-nm-diameter. At the beginning of root formation, the cross figures of oxytalan fibers were found as dot-like structures around the root sheath as well as in areas very close to blood vessels. As development proceeded, longer oxytalan fibers were produced in the apico-occlusal direction along with blood vessels. In addition, the immunoreactive products to anti-amyloid β protein on the surface of blood vessels suggest that this molecule might be involved in the adhesion of oxytalan fibers to vascular basement membranes. Thus, the oxytalan fiber system might regulate periodontal ligament function through tensional variations registered on the walls of the vascular structures.
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Affiliation(s)
- Kouji Inoue
- Research Center of Electron Microscopy, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
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Kano T, Yamamoto R, Miyashita A, Komatsu K, Hayakawa T, Sato M, Oida S. Regeneration of Periodontal Ligament for Apatite-coated Tooth-shaped Titanium Implants with and without Occlusion Using Rat Molar Model. J HARD TISSUE BIOL 2012. [DOI: 10.2485/jhtb.21.189] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Choi SC, Kwon YD, Kim KC, Kim GT. The effects of topical application of bisphosphonates on replanted rat molars. Dent Traumatol 2011; 26:476-80. [PMID: 21078072 DOI: 10.1111/j.1600-9657.2010.00929.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The purpose of this study was to evaluate the potential usefulness of two bisphosphonates (BPs) (etidronate and zoledronate), compared with that of alendronate, which is a well-known drug for delayed replantation, in decreasing or preventing inflammatory root resorption and replacement root resorption in replanted teeth. Eighty-four Sprague Dawley rat maxillary first molars were extracted, dried for 60 min and then replanted after root treatment. The rats were divided into four groups (control, alendronate, etidronate, zoledronate) as following treatments of avulsed root before replantation. At 7, 14, and 28 days postreplantation, the animals were sacrificed and the samples obtained and process for microscopic analysis. The data were statistically analyzed with the SPSS procedure, anova test and each test was complemented by the Tukey's post hoc test. The result indicated that topical application of alendronate and zoledronate, both nitrogen containing BPs, prevented inflammatory root resorption and inflammatory cell response in the delayed replantation model. Both drugs were demonstrated similar effects in the delayed tooth replantation model (P = 0.9). Etidronate did not prevent inflammatory root resorption and inflammation in the delayed replantation (P < 0.05). No significant differences in replacement root resorption were observed among all drugs. These results suggest that when teeth are dried and not replanted immediately, zoledronate, like alendronate, may prevent root resorption and facilitates the regeneration of periodontal tissues after replantation.
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Affiliation(s)
- Sung Chul Choi
- Department of Pediatric Dentistry and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Gangdong-gu, Seoul, Korea
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Gault P, Black A, Romette JL, Fuente F, Schroeder K, Thillou F, Brune T, Berdal A, Wurtz T. Tissue-engineered ligament: implant constructs for tooth replacement. J Clin Periodontol 2010; 37:750-8. [PMID: 20546087 DOI: 10.1111/j.1600-051x.2010.01588.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
AIM A tissue-engineered periodontal ligament (PDL) around implants would represent an important new therapeutic tool to replace lost teeth. The PDL is the key to tooth anchoring; it connects tooth root and alveolar bone, and it sustains bone formation. MATERIALS AND METHODS Cells were isolated from PDL and cultured in a bioreactor on titanium pins. After the formation of multiple cellular layers, pins were implanted in enlarged dental alveolae. MAIN OUTCOME MEASURES Cell-covered implants integrated without adverse effects, and induced bone in their vicinity. RESULTS A histological examination of a dog model revealed that cells were arranged in a typical ligament-like fashion. In human patients, product safety was ascertained for 6-60 months. Probing and motility assessments suggested that the implants were well integrated with mechanical properties similar to those of teeth. Radiographs demonstrated the regeneration of deficient alveolar bone, the development of a lamina dura adjacent to a mineral-devoid space around the implant and implant migration in an intact bone structure. CONCLUSIONS New tissue consistent with PDL developed on the surface of dental implants after implantation. This proof-of-principal investigation demonstrates the application of ligament-anchored implants, which have potential advantages over osseointegrated oral implants.
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Komatsu K, Shimada A, Shibata T, Shimoda S, Oida S, Kawasaki K, Nifuji A. Long-term effects of local pretreatment with alendronate on healing of replanted rat teeth. J Periodontal Res 2008; 43:194-200. [PMID: 18302622 DOI: 10.1111/j.1600-0765.2007.01012.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE Our previous study showed that topical alendronate, an inhibitor of bone resorption, reduces root resorption and ankylosis for 21 d after replantation of rat teeth. The aim of the present study was to evaluate the long-term inhibitory effects of topical alendronate in the replanted teeth. MATERIAL AND METHODS The rat maxillary first molars were extracted, placed in saline containing 1 mm alendronate (alendronate group) or saline (saline group) for 5 min and then replanted. The maxillae were dissected at 60 and 120 d. Microcomputed tomography horizontal sections at three root levels were analyzed for root and bone resorption, ankylosis and pulp mineralization. RESULTS In the alendronate group at 60 and 120 d, the frequencies of resorption of roots and bone were lower than those in the saline group. The p values show statistical significances of lower frequencies in the alendronate group than in the saline group by chi-square test (see Table 1). Ankylosis and pulp mineralization occurred in the alendronate and saline groups. Bone marrow spaces were narrowed in conjunction with bone tissue expansion around the replanted teeth in the alendronate group. CONCLUSION The inhibitory effects of topical alendronate were retained on root and bone resorption, but not on ankylosis and pulp mineralization, in the replanted teeth for 4 mo. Alendronate might also stimulate bone formation around the rat replanted teeth.
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Affiliation(s)
- K Komatsu
- Department of Pharmacology, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
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