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Soares AP, do Espírito Santo RF, Line SRP, Pinto MDGF, Santos PDM, Toralles MBP, do Espírito Santo AR. Effects of Pamidronate on Dental Enamel Formation Assessed by Light Microscopy, Energy-Dispersive X-Ray Analysis, Scanning Electron Microscopy, and Microhardness Testing. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:640-648. [PMID: 27212049 DOI: 10.1017/s1431927616000726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of the present work was to investigate birefringence and morphology of the secretory-stage enamel organic extracellular matrix (EOECM), and structural and mechanical properties of mature enamel of upper incisors from adult rats that had been treated with pamidronate disodium (0.5 mg/kg/week for 56 days), using transmitted polarizing and bright-field light microscopies (TPLM and BFLM), energy-dispersive X-ray (EDX) analysis, scanning electron microscopy (SEM) and microhardness testing. BFLM showed no morphological changes of the EOECM in pamidronate and control groups, but TPLM revealed a statistically significant reduction in optical retardation values of birefringence brightness of pamidronate-treated rats when compared with control animals (p0.05). The present study indicates that pamidronate can affect birefringence of the secretory-stage EOECM, which does not seem to be associated with significant changes in morphological and/or mechanical properties of mature enamel.
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Affiliation(s)
- Ana P Soares
- 1Multidisciplinary Institute of Health,Federal University of Bahia-UFBA,Rua Rio de Contas,58,Quadra 17,Lote 58,Candeias,Vitória da Conquista,BACEP 45.029-094,Brasil
| | - Renan F do Espírito Santo
- 2Faculty of Pharmacy,Federal University of Bahia-UFBA,Rua Barão de Jeremoabo,S/N,Campus Universitário de Ondina,Ondina,Salvador,BA CEP 40.170-115,Brasil
| | - Sérgio R P Line
- 3Piracicaba Dental School,University of Campinas-UNICAMP,Av. Limeira,901,Areião,Piracicaba,SP CEP 13.414-903,Brasil
| | - Maria das G F Pinto
- 4School of Veterinary Medicine and Zootechny,Federal University of Bahia-UFBA,Av. Ademar de Barros,500,Ondina,Salvador,BA CEP 40.170-110,Brasil
| | - Pablo de M Santos
- 5Professor Edgard Santos University Hospital,Federal University of Bahia-UFBA,Rua Augusto Viana,S/N,Canela,Salvador,BA CEP 40.110-060,Brasil
| | - Maria Betania P Toralles
- 6Institute of Health Sciences,Federal University of Bahia-UFBA,Av. Reitor Miguel Calmon,S/N,Vale do Canela,Salvador,BA CEP 40.110-902,Brasil
| | - Alexandre R do Espírito Santo
- 6Institute of Health Sciences,Federal University of Bahia-UFBA,Av. Reitor Miguel Calmon,S/N,Vale do Canela,Salvador,BA CEP 40.110-902,Brasil
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Soares AP, do Espírito Santo RF, Line SRP, Pinto MDGF, Santos PDM, Toralles MBP, do Espírito Santo AR. Bisphosphonates: Pharmacokinetics, bioavailability, mechanisms of action, clinical applications in children, and effects on tooth development. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2016; 42:212-217. [PMID: 26895384 DOI: 10.1016/j.etap.2016.01.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/18/2016] [Accepted: 01/20/2016] [Indexed: 06/05/2023]
Abstract
Bisphosphonates (BPs) avidly bind to calcium crystals and inhibit osteoclastic bone resorption, making them useful for treatment of skeletal disorders such as osteoporosis, Paget's disease, osteogenesis imperfecta and metastatic bone diseases. BPs therapeutically act by causing toxic effects on osteoclasts or interfering with specific intracellular pathways in those cells. BPs that possess nitrogen in their composition are called nitrogen-containing BPs (NBPs) and include alendronate, pamidronate, risedronate, ibandronate, and zoledronate. Simple BPs or non-NBPs do not have nitrogen in their composition, include etiodronate and clodronate, and were the first to be tested in animals and clinically used. Because BPs may be administered to pregnant women or children during deciduous and permanent teeth development, it is expected that they might disturb tooth eruption and development. A review of current literature on pharmacokinetics, bioavailability, mechanisms of action, and clinical applications of BPs in children, and their effects on tooth eruption and development is presented.
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Affiliation(s)
- Ana Prates Soares
- Multidisciplinary Institute of Health, Federal University of Bahia - UFBA, Rua Rio de Contas, 58, Quadra 17, Lote 58, Candeias, Vitória da Conquista, BA CEP 45.029-094, Brazil.
| | - Renan Fernandes do Espírito Santo
- Faculty of Pharmacy, Federal University of Bahia - UFBA, Rua Barão de Jeremoabo, S/N, Campus Universitário de Ondina, Ondina, Salvador, BA CEP 40.170-115, Brazil.
| | - Sérgio Roberto Peres Line
- Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901, Areião, Piracicaba, SP CEP 13.414-903, Brazil.
| | - Maria das Graças Farias Pinto
- School of Veterinary Medicine and Zootechny, Federal University of Bahia - UFBA, Av. Ademar de Barros, 500, Ondina, Salvador, BA CEP 40.170-110, Brazil.
| | - Pablo de Moura Santos
- Professor Edgard Santos University Hospital, Federal University of Bahia - UFBA, Rua Augusto Viana, S/N, Canela, Salvador, BA CEP 40.110-060, Brazil.
| | - Maria Betânia Pereira Toralles
- Institute of Health Sciences, Federal University of Bahia - UFBA, Av. Reitor Miguel Calmon, S/N, Vale do Canela, Salvador, BA CEP 40.110-902, Brazil.
| | - Alexandre Ribeiro do Espírito Santo
- Institute of Health Sciences, Federal University of Bahia - UFBA, Av. Reitor Miguel Calmon, S/N, Vale do Canela, Salvador, BA CEP 40.110-902, Brazil.
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Nelson-Filho P, Rossi CRB, Gomes-Silva JM, Faraoni-Romano JJ, Lucisano MP, da Silva RAB, da Silva LAB, Palma-Dibb RG. Enamel permeability and resistance to acid challenges after systemic use of sodium alendronate: a study in rat teeth. Clin Oral Investig 2015; 20:1647-54. [PMID: 26556579 DOI: 10.1007/s00784-015-1647-5] [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: 10/22/2014] [Accepted: 11/02/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To evaluate the enamel resistance and permeability of rat teeth to acid challenges after systemic use of sodium alendronate. MATERIALS AND METHODS Eighteen Wistar rats (36 teeth), aged 36-42 days (200-230 g), were assigned into two groups: alendronate group (n = 20 teeth), which received two weekly doses of 1 mg/kg of alendronate, via gavage; and a non-alendronate group (n = 16 teeth), which received only distilled water. After 60 days, the animals were killed, the maxillary incisors were extracted and used for the artificial induction of the caries lesion (pH cycling regimen) and erosion area (immersion cycles in cola-type soft drink) and for the enamel permeability test (dye penetration). The teeth were divided into alendronate group (n = 10) or non-alendronate group (n = 8) for each test. The quantitative response variables were the percent longitudinal change in Knoop microhardness (%LMC), the enamel carious/erosion lesion area (CELA) and enamel permeability. RESULTS Groups were not significantly different (p > 0.05) with regard to the %LMC and enamel permeability (25.58 μm ± 12.73 and 25.40 μm ± 4.6 for the experimental and control groups, respectively). For CELA, it was not observed significant difference (p > 0.05) between the non-alendronate group (24.08 ± 1.36 and 25.22 ± 1.60, for caries and erosion, respectively) and the alendronate group (25.46 ± 1.60 and 25.0 ± 1.26) for caries and erosion, respectively). CONCLUSIONS Based on the methodological conditions and the presented results of this study, sodium alendronate did not affect the longitudinal microhardness, demineralisation lesion area or permeability of the enamel after acid challenge; therefore, alendronate did not become the enamel of rats more resistant. CLINICAL RELEVANCE The systemic alendronate treatment for 60 days did not change the enamel of rats regarding the susceptibility to acids.
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Affiliation(s)
- Paulo Nelson-Filho
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil. .,Departamento de Clínica Infantil, Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Avenida do Café s/n, Monte Alegre, 14040-904, Ribeirão Preto, SP, Brazil.
| | - Cristhiane Ristum Bagatin Rossi
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Jaciara Miranda Gomes-Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | | | - Marília Pacífico Lucisano
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Raquel Assed Bezerra da Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Léa Assed Bezerra da Silva
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Regina Guenka Palma-Dibb
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
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Iwai T, Isomatsu Y, Iwamoto M, Tohnai I. Bisphosphonate-related enamel hypoplasia in a child with idiopathic arterial calcification of infancy. Br J Oral Maxillofac Surg 2013; 51:e186-7. [DOI: 10.1016/j.bjoms.2012.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Accepted: 05/23/2012] [Indexed: 10/28/2022]
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Vasconcelos DFP, Marques MR, Benatti BB, Barros SP, Nociti FH, Novaes PD. Intermittent parathyroid hormone administration improves periodontal healing in rats. J Periodontol 2013; 85:721-8. [PMID: 23895251 DOI: 10.1902/jop.2013.130155] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Intermittent administration of parathyroid hormone (PTH) promotes new bone formation in patients with osteoporosis and bone fractures. It was shown previously that PTH also reduces periodontitis-related bone loss. The aim of this study is to evaluate the effect of treatment with PTH on periodontal healing in rats. METHODS Fenestration defects were created at the buccal surface of the distal root of the mandibular first molars, and both periodontal ligament (PDL) and cementum were removed. Animals were then assigned to two groups (eight animals per group): group 1: control, placebo administration; and group 2: test, human PTH (hPTH) 1-34 administration at a concentration of 40 μg/kg. For both groups, the animals were injected every 2 days, and the animals were sacrificed at 14 and 21 days after surgery. Specimens were harvested and processed for routine decalcified histologic sections. The following parameters were assessed: 1) remaining bone defect extension (RBDE); 2) newly formed bone density (NFBD); 3) total callus area (TCA); 4) osteoclast number (ON) in the callus region; and 5) newly formed dental cementum-like tissue (NFC). Birefringence of root PDL reattachment was also evaluated. RESULTS Birefringence analysis showed root PDL reattachment for both groups 21 days after treatment. Intermittent hPTH 1-34 administration decreased RBDE (P <0.01) and increased NFBD (P <0.01), TCA (P <0.01), area of NFC (P <0.01), and ON in the callus region (P <0.01). CONCLUSION Within the limits of the present study, intermittent administration of hPTH 1-34 led to an enhanced periodontal healing process compared with non-treated animals.
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Nelson-Filho P, Lucisano MP, Da Silva RAB, Da Silva RS, Serra MC, Gerlach RF, Neto FCR, Carneiro ZA, Zamarioli A, Morse L, Battaglino R. Systemically alendronate was incorporated into dental tissues but did not cause morphological or mechanical changes in rats teeth. Microsc Res Tech 2012; 75:1265-71. [PMID: 22508272 DOI: 10.1002/jemt.22059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 03/21/2012] [Indexed: 11/07/2022]
Abstract
This study evaluated the effect of the systemic use of sodium alendronate in rats in vivo. Forty-five Wistar rats aged 36 to 42 days and weighing 200 to 230 g were randomly assigned to a control group (n = 20), which received distilled water, and an experimental group (n = 25), which received 2 weekly doses of 1 mg/kg of chemically pure sodium alendronate. The animals were killed after 60 days of treatment. The tibias were removed for analysis of bone mineral density by dual-energy X-ray absorptiometry (DXA). Then, the maxillary incisors were extracted for analysis of the mineralized dental tissues using fluorescence spectroscopy (FS), scanning electron microscopy (SEM), bright field microscopy (BFM), and cross-sectional microhardness (CSMH) testing. DXA and CSMH data were subjected to statistical analysis by Kruskal-Wallis test (5% significance level). The experimental group presented higher bone mineral density than the control group by DXA. FS analysis revealed presence of alendronate in the mineralized dental tissues of the specimens of the experimental group. Significant morphological differences were not found by SEM and BFM. Enamel and dentin (100 and 300 μm from the dentinoenamel junction) CSMH data did not show significant difference between the control and experimental groups. Based on the obtained results, we conclude that while alendronate increased the bone mineral density and was incorporated into the mineralized dental tissues it did not cause significant alterations in the morphology and microhardness of rat incisor enamel and dentin.
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Affiliation(s)
- Paulo Nelson-Filho
- Department of Pediatric Clinics, Preventive and Community Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
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