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Towle I, Loch C, Oxenham M, Krueger KL, Samir Salem A, de Pinillos MM, Modesto-Mata M, Hlusko LJ. Technical note: Micro-computed tomography calibration using dental tissue for bone mineral research. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024; 184:e24952. [PMID: 38775381 DOI: 10.1002/ajpa.24952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 04/13/2024] [Accepted: 04/29/2024] [Indexed: 06/20/2024]
Abstract
Computed tomography (CT) and microcomputed tomography (μCT) require calibration against density phantoms scanned with specimens or during routine internal calibration for assessment of mineral concentration (MC) and density. In clinical studies involving bone, alternative calibration methods using bodily tissues and fluids ("phantomless" calibration) have been suggested. However, such tissues are seldom available in archeological and osteological research. This study investigates the potential of dental tissue as internal reference for calibration of μCT scans, facilitating the analysis of bone MC. We analyzed 70 molars from 24 extant primate species, including eight human teeth, each scanned with density phantoms for calibration. Our findings indicate that sampling specific regions of molars (lateral aspects of the mesial cusps) yields low variation in enamel and dentine MC values, averaging 1.27 g/cm3 (±0.03) for dentine and 2.25 g/cm3 (±0.03) for enamel. No significant differences were observed across molar types or among scanning procedures, including scanner model, resolution, and filters. An ad hoc test on 12 mandibles revealed low variance in MC between the conventional phantom and dental tissue calibration methods; all 36 measurements (low, medium, and high MC for each mandible) were within 0.05 g/cm3 of each other -81% were within 0.03 g/cm3 and 94% within 0.04 g/cm3. Based on these results, we propose a new "phantomless" calibration technique using these mean enamel and dentine MC values. The presented phantomless calibration method could aid in the assessment of bone pathology and enhance the scope of studies investigating bone structure and physical property variations in archeological, osteological, and laboratory-based research.
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Affiliation(s)
- Ian Towle
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Carolina Loch
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Marc Oxenham
- School of Archaeology and Anthropology, Australian National University, Canberra, Australia
- Department of Archaeology, School of Geosciences, University of Aberdeen, Aberdeen, UK
| | - Kristin L Krueger
- Department of Anthropology, Loyola University Chicago, Chicago, IL, USA
| | - Amira Samir Salem
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Marina Martínez de Pinillos
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain
- Laboratorio de Evolución Humana (LEH), Universidad de Burgos, Burgos, Spain
| | - Mario Modesto-Mata
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain
- Universidad Internacional de La Rioja (UNIR), Logroño La Rioja, Spain
| | - Leslea J Hlusko
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain
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de Mendonça LC, Rodrigues M, Bicalho AA, da Silva GR, Quagliatto PS, Santos DQ, Soares CJ. Analysis of Calcium and Phosphate Ion Extraction From Dental Enamel by Bleaching Gels Using Ion Chromatography, Micro-CT, and SEM. Oper Dent 2024; 49:157-165. [PMID: 38349817 DOI: 10.2341/23-026-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2023] [Indexed: 02/15/2024]
Abstract
OBJECTIVES To evaluate the volume and depth of enamel loss promoted by 37.5% and 7.5% hydrogen peroxide (HP) gels, and quantify the loss of calcium (Ca) and phosphate (P) ions by using ion chromatography (IC) analysis after bleaching. METHODS Sixty bovine enamel specimens were randomly divided into three groups: Control - no bleaching gel; HP37.5%, application of HP 37.5% for 45 minutes for 14 days; and HP7.5%, application of HP 7.5% for 3 applications of 8 minutes. The surface analysis (n=5) was performed using a scanning electron microscope (SEM) and dispersive energy system (EDS) to calcium and phosphorus dosage. The micro-CT was used for the enamel loss analysis (n=5). IC was used to analyze extracted Ca and P (n=10). Data were analyzed by one-way ANOVA and two-way repeated measures ANOVA, followed by Tukey and Dunnett's tests (α=0.05). RESULTS Significantly higher volume and depth of enamel loss were found for bleached groups compared with the control group. HP7.5% had significantly higher enamel change than HP37.5%. SEM showed higher enamel porosity for HP37.5% and HP7.5% compared to control. The IC demonstrated a significant increase of Ca incorporated into the gel, however, only HP7.5% had a higher P presence than the control group. The HP7.5% showed higher Ca and P ion exchange than HP37.5% (p<0.001). CONCLUSION HP37.5% and HP7.5%, caused enamel mineral changes compared with the control group. The IC method was demonstrated to be an effective methodology for detecting enamel mineral loss by the bleaching gel.
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Affiliation(s)
- L C de Mendonça
- Ludmila Cavalcanti de Mendonça, DDS, MS, PhD student, Biomechanics Group, Department of Operative Dentistry and Dental Materials; professor, Technical School of Health, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - MdeLA Rodrigues
- Maria de Lara Araújo Rodrigues, DDS student, Biomechanics Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - A A Bicalho
- Aline Arêdes Bicalho, DDS, MS, PhD, Biomechanics Group, Department of Operative Dentistry and Dental Materials; professor, Technical School of Health, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - G R da Silva
- Gisele Rodrigues da Silva, DDS, MS, PhD, professor, Biomechanics Research Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - P S Quagliatto
- Paulo Sérgio Quagliatto, DDS, MS, PhD, professor and chairman, Biomechanics Research Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - D Q Santos
- Douglas Queiros Santos, DDS, MS, PhD, professor, Technical School of Health, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - C J Soares
- *Carlos José Soares, DDS, MS, PhD, professor and chairman, Biomechanics Research Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
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Houari S, DeRocher K, Thuy TT, Coradin T, Srot V, van Aken PA, Lecoq H, Sauvage T, Balan E, Aufort J, Calemme M, Roubier N, Bosco J, Jedeon K, Berdal A, Joester D, Babajko S. Multi-scale characterization of Developmental Defects of Enamel and their clinical significance for diagnosis and treatment. Acta Biomater 2023; 169:155-167. [PMID: 37574156 DOI: 10.1016/j.actbio.2023.08.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 07/18/2023] [Accepted: 08/08/2023] [Indexed: 08/15/2023]
Abstract
Developmental Defects of Enamel (DDE) such as Dental Fluorosis (DF) and Molar Incisor Hypomineralization (MIH) are a major public health problem. Their clinical aspects are extremely variable, challenging their early and specific diagnosis and hindering progresses in restorative treatments. Here, a combination of macro-, micro- and nano-scale structural and chemical methods, including, among others, Atom Probe Tomography recently applied on tooth enamel, were used to study and compare MIH, DF and healthy teeth from 89 patients. Globally, we show that DF is characterized by an homogenous loss of mineral content and crystallinity mainly disrupting outside layer of enamel, whereas MIH is associated with localized defects in the depth of enamel where crystalline mineral particles are embedded in an organic phase. Only minor differences in elemental composition of the mineral phase could be detected at the nanoscale such as increased F and Fe content in both severe DDE. We demonstrate that an improved digital color measurement of clinical relevance can discriminate between DF and MIH lesions, both in mild and severe forms. Such discriminating ability was discussed in the light of enamel composition and structure, especially its microstructure, organics presence and metal content (Fe, Zn). Our results offer additional insights on DDE characterization and pathogenesis, highlight the potentiality of colorimetric measurements in their clinical diagnosis and provide leads to improve the performance of minimally invasive restorative strategies. STATEMENT OF SIGNIFICANCE: Developmental Defects of Enamel (DDE) are associated to caries and tooth loose affecting billions of people worldwide. Their precise characterization for adapted minimally invasive care with optimized materials is highly expected. Here In this study, first we propose the use of color parameters measured by a spectrophotometer as a means of differential clinical diagnosis. Second, we have used state-of-the-art techniques to systematically characterize the structure, chemical composition and mechanical optical properties of dental enamel teeth affected by two major DDE, Dental Fluorosis (DF) or Molar Incisor Hypomineralization (MIH). We evidence specific enamel structural and optical features for DF and MIH while chemical modifications of the mineral nanocrystals were mostly correlated with lesion severity. Our results pave the way of the concept of personalized dentistry. In the light of our results, we propose a new means of clinical diagnosis for an adapted and improved restoration protocol for these patients.
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Affiliation(s)
- Sophia Houari
- Laboratoire de Pathophysiologie Orale Moleculaire, Centre de Recherche des Cordeliers, INSERM UMRS, Université Paris Cité, Sorbonne Université, Paris 1138, France; Unité de Formation et de Recherche d'Odontologie, Université Paris Cité, APHP, Service d'Odontologie - Hôpital La pitié-Salpetrière, Paris, France; Fédération Hospitalo-Universitaire DDS-ParisNet, INSERM, Université Paris Cité, Assistance Publique-Hôpitaux de Paris, France.
| | - Karen DeRocher
- Department of Materials Science and Engineering, Northwestern University, IL, USA
| | - Tran Thu Thuy
- Faculty of Odonto-stomatology, HochiMinh University of Medicine and Pharmacology, HôchiMinh Ville, Viet Nam
| | - Thibaud Coradin
- Laboratoire de Chimie de la Matière Condensée, Sorbonne Université, CNRS, Paris, France
| | - Vesna Srot
- Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Peter A van Aken
- Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Hélène Lecoq
- CNRS UPR3079, Université d'Orléans, Conditions Extrêmes et Matériaux: Haute Température et Irradiation, Orléans, France
| | - Thierry Sauvage
- CNRS UPR3079, Université d'Orléans, Conditions Extrêmes et Matériaux: Haute Température et Irradiation, Orléans, France
| | - Etienne Balan
- Sorbonne Université, CNRS, Institut de Recherche pour le Developpement, Museum National d'Histoire Naturelle, Institut de Minéralogie, Physique des Matériaux et Cosmochimie, Paris, France
| | - Julie Aufort
- Sorbonne Université, CNRS, Institut de Recherche pour le Developpement, Museum National d'Histoire Naturelle, Institut de Minéralogie, Physique des Matériaux et Cosmochimie, Paris, France
| | | | - Nicolas Roubier
- Laboratoire de Mécanique Paris-Saclay, CNRS, Centrale-Supélec, Université Paris-Saclay, Châtenay-Malabry, France
| | - Julia Bosco
- Unité de Formation et de Recherche d'Odontologie, Université Paris Cité, APHP, Service d'Odontologie - Hôpital La pitié-Salpetrière, Paris, France
| | - Katia Jedeon
- Laboratoire de Pathophysiologie Orale Moleculaire, Centre de Recherche des Cordeliers, INSERM UMRS, Université Paris Cité, Sorbonne Université, Paris 1138, France; Fédération Hospitalo-Universitaire DDS-ParisNet, INSERM, Université Paris Cité, Assistance Publique-Hôpitaux de Paris, France
| | - Ariane Berdal
- Laboratoire de Pathophysiologie Orale Moleculaire, Centre de Recherche des Cordeliers, INSERM UMRS, Université Paris Cité, Sorbonne Université, Paris 1138, France; Fédération Hospitalo-Universitaire DDS-ParisNet, INSERM, Université Paris Cité, Assistance Publique-Hôpitaux de Paris, France
| | - Derk Joester
- Department of Materials Science and Engineering, Northwestern University, IL, USA
| | - Sylvie Babajko
- Laboratoire de Pathophysiologie Orale Moleculaire, Centre de Recherche des Cordeliers, INSERM UMRS, Université Paris Cité, Sorbonne Université, Paris 1138, France; Fédération Hospitalo-Universitaire DDS-ParisNet, INSERM, Université Paris Cité, Assistance Publique-Hôpitaux de Paris, France; UR2496, Biomedical research in Odontology, Université Paris Cité, Montrouge, France
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Towle I, Salem AS, Veneziano A, Loch C. Variation in enamel and dentine mineral concentration and density in primate molars. Arch Oral Biol 2023; 153:105752. [PMID: 37385050 DOI: 10.1016/j.archoralbio.2023.105752] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 05/24/2023] [Accepted: 06/15/2023] [Indexed: 07/01/2023]
Abstract
OBJECTIVE Variation in enamel and dentine mineral concentration and total effective density can be reliably collected using Micro-CT scans. Both variables are suggested to reflect mechanical properties such as hardness and elastic modulus in dental tissues, meaning Micro-CT methods allow relative composition and mechanical properties to be collected non-destructively. DESIGN 16 lower molars from 16 Catarrhine primates were Micro-CT scanned alongside hydroxyapatite phantoms using standardized settings and methods to calculate mineral concentration and total effective density. Mineral concentration, total effective density and thickness of dentine and enamel were calculated for four cusps, representing each 'corner' of the tooth and four lateral crown positions (i.e., mesial, buccal, lingual and distal). RESULTS The results show mean mineral concentration and total effective density values were higher in areas of thicker enamel, while the opposite was observed for dentine. Buccal positions had significantly higher mineral concentration and total effective density values than lingual areas. Cuspal positions had higher mean values than lateral enamel, for both dentine (mineral concentration cuspal: 1.26 g/cm3; lateral: 1.20 g/cm3) and enamel (mineral concentration cuspal: 2.31 g/cm3; lateral: 2.25 g/cm3). Mesial enamel had significantly lower values than other locations. CONCLUSIONS These common patterns across Catarrhine taxa may be linked to functional adaptations related to optimization of mastication and tooth protection. Variation in mineral concentration and total effective density may also be associated with wear and fracture patterns, and can be used as baseline information to investigate the effect of diet, pathological changes and aging on teeth through time.
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Affiliation(s)
- Ian Towle
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin 9054, New Zealand.
| | - Amira Samir Salem
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin 9054, New Zealand
| | - Alessio Veneziano
- Department of Mechanical Engineering, Universitat Rovira i Virgili, Tarragona, Spain
| | - Carolina Loch
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin 9054, New Zealand
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Al-Nerabieah Z, AlKhouli M, Dashash M. Prevalence and clinical characteristics of molar-incisor hypomineralization in Syrian children: a cross-sectional study. Sci Rep 2023; 13:8582. [PMID: 37237023 DOI: 10.1038/s41598-023-35881-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 05/25/2023] [Indexed: 05/28/2023] Open
Abstract
This study was undertaken to determine the prevalence of molar incisor hypomineralization (MIH) in Syrian children and to provide information about clinical patterns and severity of MIH lesions. A sample of 1138 children aged 8-11 years was recruited for this cross-sectional study. The diagnosis of MIH was made using the criteria of the European Academy of Paediatric Dentistry (EAPD) and the MIH/HPSMs short charting form was used to score the index teeth. The results showed that the prevalence of MIH in Syrian children was 39.9%. Demarcated opacities were the most prevalent pattern of MIH defects on Permanent first molars (PFMs) and permanent incisors (PIs). Spearman rank correlation showed that the mean number of PIs and HPSMs with MIH increased when the number of affected PFMs was increased (P < 0.001). Chi-square test resulted that girls showed a higher number of severe PFMs than boys did with a statistically significant difference (x2 = 133.1, P < 0.05). Moreover, Chi-square test showed that the number of severe PFMs is higher than the number of severe PIs with a statistically significant difference (x2 = 54.9, P < 0.05). In addition, the mean dmft/DMFT index in children with MIH was found to be significantly higher than children without MIH (P < 0.05). The findings emphasize the need for early identification and management of MIH in children to prevent adverse effects on their oral health.
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Affiliation(s)
- Zuhair Al-Nerabieah
- Paediatric dentistry department, Faculty of Dentistry, Damascus University, Damascus, Syria.
| | - Muaaz AlKhouli
- Paediatric dentistry department, Faculty of Dentistry, Damascus University, Damascus, Syria
| | - Mayssoon Dashash
- Paediatric dentistry department, Faculty of Dentistry, Damascus University, Damascus, Syria
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Carvalho MR, Regalo SCH, Siéssere S, Gonçalves LMN, de Paula-Silva FWG, Vicioni-Marques F, Nelson-Filho P, de Vasconcelos PB, de Carvalho FK, de Queiroz AM. Electromyographic analysis of the stomatognathic system of children with Molar-incisor hypomineralization. PLoS One 2023; 18:e0277030. [PMID: 36827292 PMCID: PMC9955966 DOI: 10.1371/journal.pone.0277030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 10/19/2022] [Indexed: 02/25/2023] Open
Abstract
INTRODUCTION Molar-incisor hypomineralization (MIH) is a qualitative defect of dental enamel that affects one or more permanent first molars, with or without involvement of the incisor teeth. This condition leads to challenges to dental care and treatment planning. AIM Based on the hypothesis that children who have MIH possibly present alterations in postural and masticatory activities and considering the absence of studies investigating these parameters, the present study evaluated the functionality of the stomatognathic system considering the mentioned aspects. MATERIALS The comparison of individuals with (MIHG; n = 32) and without MIH (CG; n = 32) was evaluated by electromyographic activity of the masseter and temporal muscles (right and left), as well as evaluation of the masticatory cycles during habitual mastication. RESULTS MIHG showed muscle hyperactivity in postural and dynamic conditions compared to the CG; higher electromyographic values for MIHG when compared to CG in the following postural conditions: at rest for the right temporal (p = 0.00) and left temporal muscles (p = 0.03); in the protrusion to the right temporal muscle (p = 0.02); in the right laterality for the right masseter (p = 0.00) and left temporal muscles (p = 0.01); in the left laterality for the right masseter (p = 0.03) and left temporal (p = 0.04) muscles. In dynamic conditions with consistent food, significance was observed for the left temporal (p = 0.01); and with soft food for the right (p = 0.01) and left temporal muscles (p = 0.04). CONCLUSIONS Children with MIH seem to have impaired functionality of the stomatognathic system. Children with MIH have alterations in the stomatognathic system.
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Affiliation(s)
| | - Simone Cecilio Hallak Regalo
- Ribeirão Preto School of Dentistry, University of São Paulo, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - Selma Siéssere
- Ribeirão Preto School of Dentistry, University of São Paulo, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | | | | | | | - Paulo Nelson-Filho
- Ribeirão Preto School of Dentistry, University of São Paulo, São Paulo, Brazil
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Evaluation of the Efficacy of CPP-ACP Remineralizing Mousse in MIH White and Yellow Opacities-In Vitro Vickers Microhardness Analysis. Dent J (Basel) 2022; 10:dj10100186. [PMID: 36285996 PMCID: PMC9600031 DOI: 10.3390/dj10100186] [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: 07/28/2022] [Revised: 09/09/2022] [Accepted: 09/26/2022] [Indexed: 11/06/2022] Open
Abstract
Remineralization of tooth enamel can be partially achieved by the application of a casein phosphopeptides and amorphous phosphate (CPP-ACP) complex. However, evidence to support its effectiveness in Molar-incisor-hypomineralization (MIH)-affected teeth is scarce. The study’s aim is to evaluate the efficacy of CPP-ACP mousse in remineralizing MIH-affected enamel using a Vickers microhardness test. Two groups of enamel opacities of hypomineralized permanent teeth, white (group A) and yellow (group B) lesions (n = 14), went through a 28-day treatment protocol with GC Tooth Mousse. Before and after treatment, microhardness was measured in three different areas of each tooth (hypomineralized, transition, and outside the hypomineralized area). Data were analyzed using parametric and non-parametric tests with a significance of p < 0.05. The mean microhardness values increased in the hypomineralized and transition areas in both groups after the treatment protocol (in group A, 105.38 ± 11.70 to 158.26 ± 37.34; 123.04 ± 22.84 to 156.33 ± 35.70; in group B, 108.63 ± 14.66 to 143.06 ± 22.81; 132.55 ± 20.66 to 146.00 ± 12.88) and the differences pre/post-treatment were statistically significant within each group (p < 0.001 for both groups). Between groups, there was a statistically significant difference in the same areas (hypomineralized: p = 0.003; transition: p = 0.008) with a higher improvement in enamel hardness in group A. Topical application of CPP-ACP showed an increase in the physical strength of the hypomineralized and transition areas of MIH-affected enamel, likely due to an increase in mineral content.
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Soukup JW, Hetzel SJ, Stone DS, Eriten M, Ploeg HL, Henak CR. Structure-function relationships in dog dentin. J Biomech 2022; 141:111218. [PMID: 35834939 PMCID: PMC10041743 DOI: 10.1016/j.jbiomech.2022.111218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 06/07/2022] [Accepted: 07/04/2022] [Indexed: 01/19/2023]
Abstract
Investigations into teeth mechanical properties provide insight into physiological functions and pathological changes. This study sought to 1) quantify the spatial distribution of elastic modulus, hardness and the microstructural features of dog dentin and to 2) investigate quantitative relationships between the mechanical properties and the complex microstructure of dog dentin. Maxillary canine teeth of 10 mature dogs were sectioned in the transverse and vertical planes, then tested using nanoindentation and scanning electron microscopy (SEM). Microstructural features (dentin area fraction and dentinal tubule density) and mechanical properties (elastic modulus and hardness) were quantified. Results demonstrated significant anisotropy and spatial variation in elastic modulus, hardness, dentin area fraction and tubule density. These spatial variations adhered to a consistent distribution pattern; hardness, elastic modulus and dentin area fraction generally decreased from superficial to deep dentin and from crown tip to base; tubule density generally increased from superficial to deep dentin. Poor to moderate correlations between microstructural features and mechanical properties (R2 = 0.032-0.466) were determined. The results of this study suggest that the other constituents may contribute to the mechanical behavior of mammalian dentin. Our results also present several remaining opportunities for further investigation into the roles of organic components (e.g., collagen) and mineral content on dentin mechanical behavior.
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Affiliation(s)
- Jason W Soukup
- Department of Surgical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA.
| | - Scott J Hetzel
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA
| | - Donald S Stone
- Department of Materials Science and Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA
| | - Melih Eriten
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA
| | - Heidi-Lynn Ploeg
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA; Department of Mechanics and Materials Engineering, Queen's University, Kingston, ON, Canada
| | - Corinne R Henak
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA
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Jorge RC, Dos Papoula GorniReis P, Marañón-Vásquez GA, Masterson D, Cople Maia L, Mendes Soviero V. Are yellow-brownish opacities in hypomineralized teeth more prone to breakage than white-creamy ones? A systematic review. Clin Oral Investig 2022; 26:5795-5808. [PMID: 35568765 DOI: 10.1007/s00784-022-04536-4] [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: 11/11/2021] [Accepted: 05/03/2022] [Indexed: 11/30/2022]
Abstract
OBJETIVE To evaluate all the available evidence assessing if in hypomineralized teeth, yellow-brownish opacities are more prone to post-eruptive breakdown (PEB) compared to white-creamy opacities. MATERIALS AND METHODS Observational studies that evaluated the occurrence of PEB in hypomineralized teeth were considered for inclusion. Electronic searches were performed up to January 2022 in MedLine, LILACS, BBO, Cochrane Library, Web of Science, Scopus, and EMBASE. Neither publication date nor language restrictions were imposed to the searches. Two researchers independently performed the study selection, data extraction, and quality assessment of the included studies according to the Newcastle-Ottawa Scale (NOS). Datasets from studies were grouped for narrative synthesis based on the severity of the PEB (enamel or dentin), type of tooth (molar or incisor), unit of analysis (subject or tooth or tooth surface), and follow-up period (in months). The certainty of evidence was evaluated using the GRADE approach. RESULTS Nine studies were included, five cohort and three cross-sectional. All studies assessed the opacities and PEB by visual examination and diagnosed MIH according to EAPD criteria. In the cohort studies, considering all follow-up periods (ranging from 6 to 36 months), dark opacities fractured more than light opacities, at both enamel and enamel/dentin levels, and molars fractured more than incisors. In two out of three cross-sectional studies, dark opacities also fractured more than light opacities, but the deep of the PEB (enamel or dentin breakdown) or the type of tooth (molar or incisor) was not considered in the analysis. CONCLUSION Although it seems plausible to state that darker demarcated opacities in MIH patients broke more often than light ones, based on this systematic review of the literature, the certainty of the available evidence about this association is still very low. CLINICAL RELEVANCE More reliable and valid research is still necessary to support any future recommendation that MIH children who present yellow-brownish opacities should be monitored at shorter intervals compared to those who present only white-creamy opacities.
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Affiliation(s)
- Roberta Costa Jorge
- Department of Paediatric Dentistry, Universidade Do Estado Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.,Dental School, Centro Universitário Arthur Sá Earp Neto, Petrópolis, RJ, Brazil
| | - Patrícia Dos Papoula GorniReis
- Department of Paediatric Dentistry, Universidade Do Estado Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.,Dental School, Centro Universitário Arthur Sá Earp Neto, Petrópolis, RJ, Brazil
| | - Guido A Marañón-Vásquez
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Daniele Masterson
- Central Library of the Health Science Center, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Lucianne Cople Maia
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
| | - Vera Mendes Soviero
- Department of Paediatric Dentistry, Universidade Do Estado Do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.,Dental School, Centro Universitário Arthur Sá Earp Neto, Petrópolis, RJ, Brazil
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Dimitriadis K, Sfikas AK, Kamnis S, Tsolka P, Agathopoulos S. Influence of heat treatment on the microstructure and the physical and mechanical properties of dental highly translucent zirconia. J Adv Prosthodont 2022; 14:96-107. [PMID: 35601351 PMCID: PMC9095450 DOI: 10.4047/jap.2022.14.2.96] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 04/09/2022] [Accepted: 04/12/2022] [Indexed: 11/08/2022] Open
Abstract
PURPOSE Microstructural and physico-mechanical characterization of highly translucent zirconia, prepared by milling technology (CAD-CAM) and repeated firing cycles, was the main aim of this in vitro study. MATERIALS AND METHODS Two groups of samples of two commercial highly-translucent yttria-stabilized dental zirconia, VITA YZ-HTWhite (Group A) and Zolid HT + White (Group B), with dimensions according to the ISO 6872 "Dentistry - Ceramic materials", were prepared. The specimens of each group were divided into two subgroups. The specimens of the first subgroups (Group A1 and Group B1) were merely the sintered specimens. The specimens of the second subgroups (Group A2 and Group B2) were subjected to 4 heat treatment cycles. The microstructural features (microstructure, density, grain size, crystalline phases, and crystallite size) and four mechanical properties (flexural strength, modulus of elasticity, Vickers hardness, and fracture toughness) of the subgroups (i.e. before and after heat treatment) were compared. The statistical significance between the subgroups (A1/A2, and B1/B2) was evaluated by the t-test. In all tests, P values smaller than 5% were considered statistically significant. RESULTS A homogenous microstructure, with no residual porosity and grains sized between 500 and 450 nm for group A and B, respectively, was observed. Crystalline yttria-stabilized tetragonal zirconia was exclusively registered in the X-ray diffractograms. The mechanical properties decreased after the heat treatment procedure, but the differences were not statistically significant. CONCLUSION The produced zirconia ceramic materials can be safely (i.e., according to the ISO 6872) used in extensive fixed prosthetic restorations, such as substructure ceramics for three-unit prostheses involving the molar restoration and substructure ceramics for prostheses involving four or more units. Consequently, milling technology is an effective manufacturing technology for producing zirconia substructures for dental fixed all-ceramic prosthetic restorations.
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Affiliation(s)
- Konstantinos Dimitriadis
- Division of Dental Technology, Department of Biomedical Sciences, University of West Attica, Athens, Greece
| | | | - Spyros Kamnis
- Castolin Eutectic-Monitor Coatings Ltd, Newcastle, United Kingdom
| | - Pepie Tsolka
- Division of Dental Technology, Department of Biomedical Sciences, University of West Attica, Athens, Greece
| | - Simeon Agathopoulos
- Department of Materials Science and Engineering, School of Engineering, University of Ioannina, Ioannina, Greece
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Olgen IC, Sonmez H, Bezgin T. Effects of different remineralization agents on MIH defects: a randomized clinical study. Clin Oral Investig 2021; 26:3227-3238. [PMID: 34821978 DOI: 10.1007/s00784-021-04305-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 11/16/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The aim of this study was to present a comparative evaluation of the long-term efficacy of fluoride varnish and pastes containing CPP-ACP and CPP-ACP with fluoride (CPP-ACFP) in the remineralization of creamy-white and yellow-brown defects in permanent first molars with MIH. MATERIALS AND METHODS The study included 120 teeth with yellow-brown or creamy-white defects in 67 children (37 girls, 30 boys) aged 6-9 years (mean, 7.2) who were newly diagnosed with MIH with no substance loss or caries or prior restorative treatment. The patients were randomly divided into the experiment groups; control (oral hygiene motivation only), fluoride varnish, and pastes containing CPP-ACP and CPP-ACPF, and followed up for 24 months. The evaluations were made based on the ICDAS criteria and the measurements which were performed using the laser fluorescence method (DIAGNOdent, KaVo, Biberach, Germany) in the follow-ups. RESULTS The research was completed with 49 patients (23 females, 26 males; mean age, 7.7) and 90 teeth. All remineralization agents increased remineralization rates in both creamy-white and yellow-brown colored defects without presenting any statistically significant difference at the end of the follow-up period (p > 0.05). However, the effects of fluoride varnishes were late to observe when compared to pastes containing CPP-ACP and CPP-ACPF. CONCLUSIONS Pastes containing calcium and phosphate may be recommended for the longer-term preservation of teeth with yellow-brown defects which showed a post-eruptive breakdown in a shorter time. CLINICAL RELEVANCE There is a lack of studies investigating MIH treatments in which lesion appearance was recorded. This study evaluated creamy-white and yellow-brown MIH defects separately and reported long-term results of different remineralization agents.
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Affiliation(s)
- Irem Can Olgen
- Department of Pediatric Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Hayriye Sonmez
- Department of Pediatric Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Tugba Bezgin
- Department of Pediatric Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey.
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Alshami AA, Sawan NM, Alhamed SA, Helmi M, Mustafa OSE, Alsagob EI. Shear bond strength of resin modified glass ionomer cement following photodynamic therapy, Er,Cr:YSGG and chlorhexidine in hypoplastic primary teeth. Photodiagnosis Photodyn Ther 2021; 36:102593. [PMID: 34673269 DOI: 10.1016/j.pdpdt.2021.102593] [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: 09/09/2021] [Revised: 09/27/2021] [Accepted: 10/15/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE This study investigates the micro shear bond strength of resin-modified glass ionomer cement (RMGIC) bonded to hypoplastic teeth after the application of chlorhexidine (CHX), sodium hypochlorite (NaOCl), Er;Cr:YSGG and methylene blue mediated antimicrobial photodynamic therapy (APDT). METHODS A total sample of 60 erupted and extracted hypoplastic teeth collected from < 16 years children were subjected to different conditioning protocols including control group that involved bonding of hypoplastic teeth with RMGIC; CHX and NaOCl groups that included hypoplastic enamel being treated with 0.2% CHX and 2% NaOCl solution for 30 s followed by rinsing and drying for 5 s, MB-PDT group involved methylene blue photosensitizer and Er,Cr:YSGG group. All specimens were processed for microshear bond strength in a universal tester. The fractured surface was examined using a stereomicroscope at 40 × magnification and categorized under adhesive, cohesive and mixed. RESULTS The highest microshear bond strength was noted for the control group (∼29 MPa). Whereas the specimens conditioned by NaOCl showed the lowest microshear bond strength (∼17 MPa). Among the treatment groups, APDT showed the highest bond strength values (∼22 MPa) as compared to chemical disinfection protocols. However, Er, Cr:YSGG showed slightly lower microshear bond strength as compared to APDT. No significant difference was noted between CHX and NaOCl groups (p > 0.05). There was a statistically significant difference when all the groups were compared together (p < 0.05). Microscopic analysis revealed that specimens bonded after APDT showed the highest adhesive failures (70%). The highest cohesive failures were seen in NaOCl group (40%). The mixed type of failures was seen in the control groups with none appearing for chemical disinfection protocols. CONCLUSIONS This study concludes that APDT could be a potential therapeutic strategy for increasing the microshear bond strength of RMGIC to hypoplastic enamel.
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Affiliation(s)
- Abeer A Alshami
- Department of Preventive Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Nozha M Sawan
- Department of Preventive Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Sanaa A Alhamed
- Diagnostic Science Department, Faculty of Dentistry, King Abdulaziz University, Riyadh, Saudi Arabia
| | - Mohammad Helmi
- Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | | | - Eman I Alsagob
- Department of Preventive Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia.
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Micromechanics of dental cement paste. J Mech Behav Biomed Mater 2021; 124:104863. [PMID: 34634693 DOI: 10.1016/j.jmbbm.2021.104863] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 09/21/2021] [Accepted: 09/25/2021] [Indexed: 11/20/2022]
Abstract
Biodentine is a calcium silicate/calcium carbonate/zirconium dioxide/water-based dental replacement biomaterial, significantly outperforming the stiffness and hardness properties of chemically similar construction cement pastes. We here report the first systematic micromechanical investigation of Biodentine, combining grid nanoindentation with ultrasonic testing and micromechanical modeling. Histograms of nanoindentation-probed hardness and elastic modulus, comprising more than 5700 values each, are very well represented by the superposition of three log-normal distributions (LNDs). Most of the data (74%) belong to the intermediate LND, representing highly dense calcite-reinforced hydration products with on-average more than 60GPa elastic modulus and 3GPa hardness. The remaining data refer, on the one hand, to lower density hydration products, and on the other hand, to single-micron-sized unhydrated clinker and zirconium-dioxide inclusions. Micromechanical homogenization of these three material phases delivers elastic properties of the overall cement paste material, which significantly exceed those probed by more than 300 ultrasonic tests performed in the kHz and MHz regime. This indicates the presence of micro-defects, which slightly weaken the otherwise highly optimized biomaterial system.
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Hypersensitivity in teeth affected by molar-incisor hypomineralization (MIH). Sci Rep 2021; 11:17922. [PMID: 34504122 PMCID: PMC8429747 DOI: 10.1038/s41598-021-95875-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 07/30/2021] [Indexed: 11/12/2022] Open
Abstract
Tooth hypersensitivity is a common symptom in patients with molar-incisor hypomineralization (MIH). Therefore, this clinical study aimed to assess potential associations between patient- and tooth-related variables and the intensity of hypersensitivity in MIH-affected permanent teeth compared to healthy controls. Fifty-seven MIH patients and 20 healthy adolescents with a total of 350 MIH-affected and 193 healthy teeth were included in this study. The intensity of hypersensitivity was measured after cold air stimulation using the Schiff Cold Air Sensitivity Scale (SCASS) by the dentist and visual analogue scale (VAS) by the patient. Tooth hypersensitivity was low in non-MIH teeth (97.9% of the group had zero SCASS and VAS values). In contrast, MIH-affected teeth with demarcated opacities and atypical restorations had moderate SCASS and VAS values, whereas teeth with enamel breakdown were mostly linked to severe hypersensitivity. The logistic regression model confirmed a significantly lower level of hypersensitivity in MIH patients aged ≥ 8 years (OR 0.06, 95% CI 0.01–0.50, p = 0.009) and higher levels in molar teeth (OR 5.49, 95% CI 1.42–21.27, p = 0.014) and teeth with enamel disintegration (OR 4.61, 95% CI 1.68–12.63, p = 0.003). These results indicate that MIH-related tooth hypersensitivity seems to be present in disintegrated molars immediately after tooth eruption.
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Case report of a novel interim approach to prevent early posteruptive enamel breakdown of molar-incisor hypomineralization-affected molars. J Am Dent Assoc 2021; 152:560-566. [PMID: 34176570 DOI: 10.1016/j.adaj.2021.04.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/03/2021] [Accepted: 04/08/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND AND OVERVIEW Severely molar-incisor hypomineralization (MIH)-affected teeth are prone to develop early posteruptive enamel breakdown (PEB) and caries. A novel conservative interim approach for the prevention of this complication is presented. CASE DESCRIPTION A 6-year-old boy with strong hypersensitivity and extensive brown opacities in the partially erupted mandibular permanent first molars (PFMs) was diagnosed with MIH. Constant hygiene and dietary counseling were followed by the application of luted orthodontic bands and glass ionomer sealants to protect PFMs from caries and PEB until the complete eruption of the teeth. After 36 months, the PFMs were completely erupted, with no caries and PEB, and the cooperation of the child increased. CONCLUSIONS AND PRACTICAL IMPLICATIONS Temporary strategies are useful to preserve MIH-affected PFMs. With the methodology described, the hypersensitivity decreased and the patient reached a good degree of cooperation, making possible definitive rehabilitative considerations.
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Roma M, Hegde P, Durga Nandhini M, Hegde S. Management guidelines for amelogenesis imperfecta: a case report and review of the literature. J Med Case Rep 2021; 15:67. [PMID: 33557885 PMCID: PMC7871387 DOI: 10.1186/s13256-020-02586-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/16/2020] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Rehabilitation of the entire dentition with amelogenesis imperfecta (AI) tends to pose a great challenge to the clinician. Most of the cases of amelogenesis imperfecta are reported to be associated with skeletal and dental deformities which results in severe sensitivity of the dental tissues. CASE PRESENTATION This clinical case report marks out the total restoration of the oral condition of a young Indian patient diagnosed with the hypoplastic type of amelogenesis imperfecta. Fixed metal ceramic prosthesis were planned to strengthen the masticatory activity, aesthetics, to banish the dental sensitivity and to build up the general persona of the patient. The patient was followed-up at 6 months, 1 year and 2 years intervals. Functional and esthetic impairment was not visible after the follow up period and the treatment outcome was successful. The entire treatment plan was intended to enhance the functional, esthetic and the masticatory component of the occlusal architecture. CONCLUSION This case report details the presentation, characteristic radiographic findings, and management of a patient with an extremely rare condition of amelogenesis imperfecta.
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Affiliation(s)
- M. Roma
- Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka India
| | - Puneet Hegde
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka India
| | - M. Durga Nandhini
- Department of General Medicine, Government Kilpauk Medical College, Chennai, Tamil Nadu, India
| | - Shreya Hegde
- Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka India
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Hubbard MJ, Perez VA, Ganss B. 100 Years of Chalky Teeth Research: From Pioneering Histopathology to Social Good. FRONTIERS IN DENTAL MEDICINE 2021. [DOI: 10.3389/fdmed.2020.632534] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
One hundred years ago, histopathology pioneer Bernhard Gottlieb described developmentally disrupted teeth as having “chalky enamel” and “chalky spots” that “crumble” easily. He also asked pivotal questions about the pathogenesis of “enamel hypoplasia” that remained enigmatic for almost a century. Today, breakthrough pathomechanistic investigations of chalky enamel are revealing surprising answers, and an allied translational initiative—The D3 Group for developmental dental defects (“D3s”) —is converting such scientific knowledge into social good surrounding prevention of tooth decay. Molar hypomineralisation (MH) affects 1-in-5 children worldwide and is well-evidenced, but poorly recognised, as a principal risk factor for childhood tooth decay. Given MH is causally linked to infantile illness, an exciting corollary is that medical prevention would lead to substantial reductions in decay. Here we reflect on the past century of chalky teeth research and retrace the path leading to recognition of MH as a global health concern. Five research eras, today's four major D3s, and diverse experimental attacks are outlined alongside translational wins that have benefitted global health. Addressing hopes for medical prevention of MH, this centennial year's pathomechanistic discovery is contextualised against past accomplishments and new opportunities. Finally, we note the translational value of accessible infographics for guiding future work, and forecast exciting prospects for the next century.
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Arheiam A, Abbas S, Ballo L, Borowis E, Rashwan S, El Tantawi M. Prevalence, distribution, characteristics and associated factors of molar-incisor hypo-mineralisation among Libyan schoolchildren: a cross-sectional survey. Eur Arch Paediatr Dent 2021; 22:595-601. [PMID: 33389689 DOI: 10.1007/s40368-020-00594-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 11/26/2020] [Indexed: 10/22/2022]
Abstract
BACKGROUND AND AIM This study aimed to assess the prevalence and clinical status of molar incisor hypomineralisation (MIH) and other enamel defects and associated factors in Libyan children. METHODS A cross-sectional survey of a randomly selected sample of 8- to 10-year-old Libyan school children was conducted in the city of Benghazi, Libya in 2019. The children were assessed for the presence of MIH and enamel defects according to EAPD evaluation criteria. The survey was supplemented by a questionnaire, completed by parents, about potential associated factors occurring before, around and after birth. Association with risk indicators was assessed using chi-square and Mann-Whitney U tests. RESULTS One thousand forty-seven children returned complete questionnaires and attended the clinical examination, with 87% response rate. MIH was the most common form of enamel defects, affecting 162 (15.5%) children. The average number of MIH affected teeth was 3.54 (SD = 1.82). There were no statistically significant associations between the prevalence of MIH and health or demographic characteristics except for the history of early childhood health problems (P = 0.047). CONCLUSIONS In Libyan children, MIH appeared to be the most prevalent type of enamel defects affecting 15.5% of the participants. Although not statistically significant, MIH appeared to be associated with prenatal, perinatal and post-natal challenges.
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Affiliation(s)
- A Arheiam
- Department of Community and Preventive Dentistry, Faculty of Dentistry, University of Benghazi, Benghazi, Libya.
| | - S Abbas
- Department of Basic Medical Sciences, Faculty of Dentistry, University of Benghazi, Benghazi, Libya
| | - L Ballo
- Department of Community and Preventive Dentistry, Faculty of Dentistry, University of Benghazi, Benghazi, Libya
| | - E Borowis
- Department of Basic Medical Sciences, Faculty of Dentistry, University of Benghazi, Benghazi, Libya
| | - S Rashwan
- Department of Community and Preventive Dentistry, Faculty of Dentistry, University of Benghazi, Benghazi, Libya
| | - M El Tantawi
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
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Olmo-González B, Moreno-López R, Ribera-Uribe M. Dental management strategies for Molar Incisor Hypomineralization. PEDIATRIC DENTAL JOURNAL 2020. [DOI: 10.1016/j.pdj.2020.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Feltrin-Souza J, Jeremias F, Alaluusua S, Sahlberg C, Santos-Pinto L, Jernvall J, Sova S, Cordeiro RDCL, Cerri PS. The effect of amoxicillin on dental enamel development in vivo. Braz Oral Res 2020; 34:e116. [PMID: 32901731 DOI: 10.1590/1807-3107bor-2020.vol34.0116] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 07/26/2020] [Indexed: 12/30/2022] Open
Abstract
The exposure to amoxicillin has been associated with molar incisor hypomineralization. This study aimed to determine if amoxicillin disturbs the enamel mineralization in in vivo experiments. Fifteen pregnant rats were randomly assigned into three groups to received daily phosphatase-buffered saline or amoxicillin as either 100 or 500 mg/kg. Mice received treatment from day 13 of pregnancy to day 40 postnatal. After birth, the offsprings from each litter continued to receive the same treatment according to their respective group. Calcium (Ca) and phosphorus (P) content in the dental hard tissues were analyzed from 60 upper first molars and 60 upper incisors by the complexometric titration method and colorimetric analysis using a spectrophotometer at 680 nm, respectively. Lower incisors were analyzed by X-ray microtomography, it was measured the electron density of lingual and buccal enamel, and the enamel and dentin thickness. Differences in Ca and P content and electron density among the groups were analyzed by one-way ANOVA. There was no significant difference on enamel electron density and thickness among the groups (p > 0.05). However, in incisors, the higher dose of amoxicillin decreased markedly the electron density in some rats. There were no statistically significant differences in Ca (p = 0.180) or P content (p = 0.054), although the higher dose of amoxicillin could affect the enamel in some animals. The amoxicillin did not significantly alter the enamel mineralization and thickness in rats.
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Affiliation(s)
- Juliana Feltrin-Souza
- Universidade Federal do Paraná - UFPR, Department of Stomatology, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Fabiano Jeremias
- Universidade Estadual Paulista - Unesp, School of Dentistry, Department of Pediatric Dentistry, Araraquara, SP, Brazil
| | - Satu Alaluusua
- University of Helsinki, School of Medicine, Department of Oral and Maxillofacial Diseases, Helsinki, Finland
| | - Carin Sahlberg
- University of Helsinki, School of Medicine, Department of Oral and Maxillofacial Diseases, Helsinki, Finland
| | - Lourdes Santos-Pinto
- Universidade Estadual Paulista - Unesp, School of Dentistry, Department of Pediatric Dentistry, Araraquara, SP, Brazil
| | - Jukka Jernvall
- University of Helsinki, Institute of Biotechnology, Developmental Biology Program, Helsinki, Finland
| | - Susanna Sova
- University of Helsinki, Institute of Biotechnology, Developmental Biology Program, Helsinki, Finland
| | | | - Paulo Sérgio Cerri
- Universidade Estadual Paulista - Unesp, School of Dentistry, Department of Morphology, Araraquara, SP, Brazil
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Structural and chemical enamel characteristics of hypomineralised second primary molars. Eur Arch Paediatr Dent 2020; 22:361-366. [DOI: 10.1007/s40368-020-00557-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 08/19/2020] [Indexed: 01/23/2023]
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Gao J, Li X, Gao L, Chen H, Baras BH, Liu X, Liu H, Rana A, Gao M, Ruan J. Effects of applying amoxicillin in juvenile mice on enamel mineralization and the expression of kallikrein‑related peptidase 4 and tight junction proteins in ameloblasts. Int J Mol Med 2020; 46:179-190. [PMID: 32626909 PMCID: PMC7255463 DOI: 10.3892/ijmm.2020.4598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Accepted: 04/07/2020] [Indexed: 11/19/2022] Open
Abstract
Amoxicillin is a common pediatric drug. However, to the best of our knowledge, the role of amoxicillin in enamel hypomineralization has not yet been fully elucidated. The aim of the present study was to assess the effects of amoxicillin on enamel mineralization, the morphology of ameloblasts, as well as the expression of kallikrein-related peptidase 4 (KLK4), and the tight junction proteins, claudin 1 (CLDN1), claudin 4 (CLDN4) and occludin (OCLN), in ameloblasts of juvenile mice. A total of 36 3-day-old Kunming mice were randomly divided into three groups. The mice were administered 0, 50 or 100 mg/kg amoxicillin by intragastric administration for 19 days. The surface morphology and calcium (Ca), phosphorous (P) and carbon contents of mandibular incisors and first molars were examined by scanning electron microscopy and energy dispersive X-ray spectroscopy. Histological changes in the ameloblasts of mandibular incisors were analyzed by hematoxylin and eosin staining. The KLK4, CLDN1, CLDN4 and OCLN expression levels of ameloblasts were observed by immunohistochemical staining. The incidence of white patches in the incisor was 100% in the 100 mg/kg amoxicillin-treated groups. A greater number of enamel defects were observed in the incisal/occlusal half of mandibular incisors/molars compared with in the cervical half in the amoxicillin-treated groups. Following phosphoric-acid treatment, the enamel rod and interrod were aligned in a disorderly manner in the amoxicillin-treated groups. Amoxicillin decreased the Ca/P ratio in the enamel of mandibular incisors and molars. More intercellular spaces among maturation ameloblasts were observed in the amoxicillin-treated groups. Amoxicillin decreased KLK4 and CLDN1, CLDN4 and OCLN expression in mature ameloblasts. The administration of amoxicillin in juvenile mice induced enamel hypomineralization, and the effects of amoxicillin on enamel hypomineralization may be mediated via multiple pathways.
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Affiliation(s)
- Jianghong Gao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Xinmei Li
- Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Liping Gao
- Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Haiyan Chen
- Core Research Laboratory, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Bashayer H Baras
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, MD 21201, USA
| | - Xiaojing Liu
- Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Hao Liu
- Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Ayesha Rana
- Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Meili Gao
- Department of Biological Science and Engineering, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P.R. China
| | - Jianping Ruan
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
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Lagarde M, Vennat E, Attal JP, Dursun E. Strategies to optimize bonding of adhesive materials to molar-incisor hypomineralization-affected enamel: A systematic review. Int J Paediatr Dent 2020; 30:405-420. [PMID: 31990108 DOI: 10.1111/ipd.12621] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 01/17/2020] [Accepted: 01/22/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND Children with first permanent molar affected by molar-incisor hypomineralization (MIH) show high treatment failure rate. AIM To conduct a systematic review on bonding of adhesive materials to MIH-affected enamel, so as to identify all the methods suggested to optimize it and to determine the best bonding protocol(s). DESIGN An exhaustive literature search was conducted on MEDLINE/PubMed, the Cochrane Library, and Web of Science databases, up to October 2018. Laboratory and clinical studies, involving adhesive restorations bonded to MIH-affected enamel, with at least a comparative group were included. Two authors independently selected studies, collected data, and assessed bias risk. RESULTS After title and abstract review and duplicate exclusion, 14 articles were selected on the 496 eligible papers. After full reading, 4 articles were excluded. Finally, 10 studies (6 laboratory and 4 clinical studies) were included. CONCLUSIONS Bond strength of composite was not significantly different when using self-etch compared with etch-and-rinse adhesives. Deproteinization after etching for etch-and-rinse adhesives enhanced bond strength; this could allow to keep MIH-affected enamel. Icon® showed an erratic penetration; however, a preliminary deproteinization after etching could improve bond strength. A study reported no significant differences in sealant retention rate, whereas another recommended to previously apply an adhesive.
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Affiliation(s)
- Marianne Lagarde
- Faculty of Dental Surgery, Paris Descartes University, Montrouge, France.,Henri Mondor Hospital, Créteil, France.,Innovative Dental Materials and Interfaces Research Unit (EA 4462), Montrouge, France
| | - Elsa Vennat
- Innovative Dental Materials and Interfaces Research Unit (EA 4462), Montrouge, France.,Centrale-Supélec, MSSMat Laboratory, Gif-sur-Yvette, France
| | - Jean-Pierre Attal
- Faculty of Dental Surgery, Paris Descartes University, Montrouge, France.,Innovative Dental Materials and Interfaces Research Unit (EA 4462), Montrouge, France.,Charles Foix Hospital, Ivry-sur-Seine, France
| | - Elisabeth Dursun
- Faculty of Dental Surgery, Paris Descartes University, Montrouge, France.,Henri Mondor Hospital, Créteil, France.,Innovative Dental Materials and Interfaces Research Unit (EA 4462), Montrouge, France
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Fatturi AL, Menoncin BL, Reyes MT, Meger M, Scariot R, Brancher JA, Küchler EC, Feltrin-Souza J. The relationship between molar incisor hypomineralization, dental caries, socioeconomic factors, and polymorphisms in the vitamin D receptor gene: a population-based study. Clin Oral Investig 2020; 24:3971-3980. [PMID: 32236726 DOI: 10.1007/s00784-020-03263-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 03/13/2020] [Indexed: 01/13/2023]
Abstract
OBJECTIVES The purpose of this cross-sectional study was to investigate whether polymorphisms in vitamin D receptor (VDR) genes increase the prevalence of dental caries, molar incisor hypomineralization (MIH), and hypomineralized primary second molars (HPSM). MATERIAL AND METHODS A representative population-based sample of 731 schoolchildren, 8 years of age, was randomly selected in Curitiba, Paraná, Brazil. MIH, HPSM, and dental caries were clinically assessed by four calibrated examiners (kappa > 0.80) using European Academy of Pediatric Dentistry (2003) criteria, the modified Developmental Defects of Enamel (DDE) index, and the Decayed, Missing, or Filled Teeth (DMFT) index by the World Health Organization (2013), respectively. The VDR rs739837 and rs2228570 polymorphisms were genotyped using real-time polymerase chain reaction. Associations were analyzed by Poisson regression with robust variance (α = 0.05). RESULTS Schoolchildren with MIH presented a higher prevalence of dental caries (DMFT > 1, PR = 2.52, confidence interval = 1.60-3.97, p ≤ 0.001). No association was observed between MIH, HPSM, and dental caries, with rs739837 and rs2228570 polymorphisms. Individuals with the GT/GG genotype in rs739837 polymorphism presented a higher prevalence of MIH in molars and incisors than individuals TT (PR = 2.34, confidence interval = 1.08-5.07, p = 0.03). CONCLUSION Children with MIH presented a significant higher prevalence of dental caries than children without MIH. To carry at least one G allele in rs739837 was associated to higher prevalence of MIH in molars and incisors. CLINICAL RELEVANCE Our findings suggested that more severe cases with incisors affected by MIH could be associated with polymorphism in VDR gene.
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Affiliation(s)
- Aluhê Lopes Fatturi
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, PR, Brazil.,School of Dentistry, Guairaca College, Guarapuava, PR, Brazil
| | | | | | - Michelle Meger
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - Rafaela Scariot
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, PR, Brazil.,School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - João Armando Brancher
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - Erika Calvano Küchler
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
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Rahul M, Ashima G, Krishan G, Veenu S. Analysis of bone mineral density and content in children with molar incisor hypomineralization using dual-energy X-ray absorptiometry scan: A pilot study. J Indian Soc Pedod Prev Dent 2019; 37:282-285. [PMID: 31584029 DOI: 10.4103/jisppd.jisppd_321_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
AIM The objective was to evaluate the bone mineral density (BMD) and bone mineral content (BMC) in children affected with molar incisor hypomineralization (MIH) using dual-energy X-ray absorptiometry (DEXA) scan. MATERIALS AND METHODS The study comprised a total of 30 children aged 6-10 years. Fifteen children were affected with MIH (moderate and severe variety) diagnosed using the European Academy of Paediatric Dentistry 2003 criteria, and remaining 15 children not affected with MIH serve as a control group. DEXA scan was done in all the selected children under standard conditions. RESULTS A positive association was seen between childhood illness and MIH. The mean subtotal BMC (grams) in MIH and control group was 633 ± 80.05 and 670.33 ± 166.41, respectively, whereas mean subtotal BMD (g/m2) was 1.00 and 0.87 ± 0.35, respectively, with no statistically significant difference between two groups. BMD and BMC at the lumbar spine and thoracic spine locations were also did not vary significantly between MIH-affected children and controls. CONCLUSION Childhood illnesses were more common in MIH-affected children compared to controls. Bone maturation parameters (BMD, BMC) do not differ between MIH affected and control children.
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Affiliation(s)
- Morankar Rahul
- Oral Health Sciences Centre, Unit of Pedodontics and Preventive Dentistry, PGIMER, Chandigarh, India
| | - Goyal Ashima
- Oral Health Sciences Centre, Unit of Pedodontics and Preventive Dentistry, PGIMER, Chandigarh, India
| | - Gauba Krishan
- Oral Health Sciences Centre, PGIMER, Chandigarh, India
| | - Singla Veenu
- Department of Radiodiagnosis and Imaging, PGIMER, Chandigarh, India
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26
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Malmberg P, Norén JG, Bernin D. Molecular insights into hypomineralized enamel. Eur J Oral Sci 2019; 127:340-346. [DOI: 10.1111/eos.12619] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/19/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Per Malmberg
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Gothenburg Sweden
| | - Jörgen G. Norén
- Department of Pediatric Dentistry Institute of Odontology Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
| | - Diana Bernin
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Gothenburg Sweden
- Swedish NMR Centre University of Gothenburg Gothenburg Sweden
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Rai PM, Jain J, Raju AS, Nair RA, Shashidhar K, Dsouza S. Prevalence of Molar Incisor Hypomineralization among School Children Aged 9 to 12 Years in Virajpet, Karnataka, India. Open Access Maced J Med Sci 2019; 7:1042-1046. [PMID: 30976358 PMCID: PMC6454169 DOI: 10.3889/oamjms.2019.224] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/23/2019] [Accepted: 03/24/2019] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND: The molar incisor hypomineralization (MIH) is defined as a qualitative defect of the enamel characterised by the progressive and simultaneous hypomineralization of the enamel structure of the first permanent molars which is of systemic origin, which may be associated frequently with incisors. Although the reported prevalence of MIH ranges from 2.4% to 40.2% worldwide, very little data is available from India. AIM: To determine the prevalence of molar incisor hypomineralization among school children aged 9 to 12 years in virajpet, Karnataka. METHODS: This cross-sectional descriptive study consisted of 1600 school children aged 9-12 years selected by stratified cluster sampling procedure. The European Academy of Pediatric Dentistry criteria were followed for MIH diagnosis. Chi-square test was used to analyse the categorical data. P ≤ 0.05 was considered for statistical significance. RESULTS: The prevalence of MIH is 13.12% with no gender predilection. Ten-year-old children showed the highest prevalence (15%) among all the age group. Majority of children with MIH (70.2%) have lesions in both molars and incisors with demarcated opacities and atypical restorations being the most frequent defect type. CONCLUSION: Prevalence of MIH was 13.12% in the 9-12-year child population in Virajpet. There is a need for a proper planned preventive and restorative program about the increasing prevalence of MIH.
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Affiliation(s)
- Pooja Mali Rai
- Department of Public Health Dentistry, Coorg Institute of Dental Sciences, Virajpet, Karnataka
| | - Jithesh Jain
- Department of Public Health Dentistry, Coorg Institute of Dental Sciences, Virajpet, Karnataka
| | - Ananda Shivamoga Raju
- Department of Public Health Dentistry, Coorg Institute of Dental Sciences, Virajpet, Karnataka
| | - Rohit A Nair
- Department of Public Health Dentistry, Coorg Institute of Dental Sciences, Virajpet, Karnataka
| | - Keerthan Shashidhar
- Department of Orthodontics and Dentofacial Orthopedics, Subbaiah Institue of Dental Sciences, Shivamogga, Karnataka, India
| | - Sheehan Dsouza
- Department of Periodontology, Srinivas Institute of Dental Sciences, Mangalore, Karnataka
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Elshaer A, Nair S, Hassanin H. Near Net Shape Manufacturing of Dental Implants Using Additive Processes. ACTA ACUST UNITED AC 2019. [DOI: 10.1007/978-3-030-10579-2_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Gamboa GCS, Lee GHM, Ekambaram M, Yiu CKY. Knowledge, perceptions, and clinical experiences on molar incisor hypomineralization among dental care providers in Hong Kong. BMC Oral Health 2018; 18:217. [PMID: 30545337 PMCID: PMC6293514 DOI: 10.1186/s12903-018-0678-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 11/27/2018] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Molar incisor hypomineralization (MIH) is an alarming problem with considerable challenges in management. This study aimed to evaluate and compare the knowledge, perceptions, and clinical experiences of molar incisor hypomineralization (MIH) between general dental practitioners (GDPs) and paediatric dentists (PDs) in Hong Kong. METHODS A cross-sectional survey of 557 randomly selected GDPs (approximately 25% of all registered dentists) and all registered PDs (n = 31) were invited. They were asked to complete a 4-section questionnaire adapted and modified from a study by Gambetta-Tessini and co-workers on sociodemographic profiles, knowledge, experience, and perceptions regarding MIH. Data were analyzed with chi-square, Fisher's exact, and multiple factor ANCOVA tests. RESULTS The overall response rate was 43.37% (255/588). Majority (74.1%) of the respondents encountered MIH in their practices. A significantly higher mean knowledge score (46.33 ± 7.1) was observed among PDs than GDPs (43.09 ± 7.0) (P < 0.01) and among PDs who are 40 years old or younger (P < 0.001). Differences in treatment of MIH were also observed between PDs and GDPs (P < 0.05). Paediatric dentists were more confident in diagnosing and treating MIH (P < 0.001). Most respondents (87.8%) expressed a need for continuing education on MIH. CONCLUSION Continuing education on MIH is needed to assure that the highest quality of evidence-based care is given to patients with MIH. Dissemination of latest best evidence on MIH, especially to GDPs, will assure that the condition is accurately diagnosed and well managed.
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Affiliation(s)
- Gianina Camille Sicangco Gamboa
- Paediatric Dentistry, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong, SAR China
| | - Gillian Hiu Man Lee
- Paediatric Dentistry, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong, SAR China
| | - Manikandan Ekambaram
- Paediatric Dentistry, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Cynthia Kar Yung Yiu
- Paediatric Dentistry, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong, SAR China
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Wu X, Wang J, Li YH, Yang ZY, Zhou Z. Association of molar incisor hypomineralization with premature birth or low birth weight: systematic review and meta-analysis. J Matern Fetal Neonatal Med 2018; 33:1700-1708. [DOI: 10.1080/14767058.2018.1527310] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Xiaoyan Wu
- College of Stomatology, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory for Oral Diseases and Biomedical Science, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Jingxue Wang
- College of Stomatology, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory for Oral Diseases and Biomedical Science, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Yue-heng Li
- College of Stomatology, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory for Oral Diseases and Biomedical Science, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Zheng-yan Yang
- College of Stomatology, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory for Oral Diseases and Biomedical Science, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Zhi Zhou
- College of Stomatology, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory for Oral Diseases and Biomedical Science, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
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31
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Folayan MO, Oyedele TA, Oziegbe E. Time expended on managing molar incisor hypomineralization in a pediatric dental clinic in Nigeria. Braz Oral Res 2018; 32:e79. [PMID: 30088552 DOI: 10.1590/1807-3107bor-2018.vol32.0079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 06/19/2018] [Indexed: 11/22/2022] Open
Abstract
This study assessed the difference in the number of visits made to a dental care clinic and the time spent providing specific dental treatment for children with and without molar incisor hypomineralization (MIH). Children aged 8 to 16 years who presented at the Pediatric Dental Unit of the Obafemi Awolowo University Teaching Hospital Complex, in Ile-Ife, Nigeria, were eligible for the study. A comprehensive medical and dental history was taken, and each child was clinically examined, diagnosed, and treated according to a drawn-up plan. The time taken to establish a diagnosis and to provide specific treatments (scaling and polishing, restoration, pulpectomy, extraction, and placement of stainless steel crowns) and the number of visits made to complete the treatment plan were recorded for each child. Differences in the number of visits, time expended to make a diagnosis and to treat children with and without MIH were analyzed. The average time for diagnosis (p = 0.001) and the average time for placing amalgam restorations (p = 0.008) were significantly longer in children with MIH than in those without it. Children with MIH made more visits to the clinic (p < 0.001).There was no significant difference in the average time for scaling and polishing (p = 0.08), glass ionomer cement restorations (p = 0.99), composite restorations (p = 0.26), pulpectomy (p = 0.42), tooth extraction (p = 0.06), and placement of a stainless steel crown (p = 0.83) in children with and without MIH. In conclusion, children with MIH required more time for oral health care. Placing amalgam restorations took significantly longer than placing tooth bonding restorative materials in children with MIH than in those without it.
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Affiliation(s)
| | - Titus Ayodeji Oyedele
- Babcock University, Benjamin Carson (Snr) School of Medicine, Department of Surgey, Ilisan-Remo, Ogun State, Nigeria
| | - Elizabeth Oziegbe
- Obafemi Awolowo University, Department of Child Dental Health, Ile-Ife, Nigeria
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32
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Adhesion to Enamel of Teeth Affected by Molar Incisor Hypomineralization: Literature Review. BALKAN JOURNAL OF DENTAL MEDICINE 2018. [DOI: 10.2478/bjdm-2018-0011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Summary
Background/Aim: Molar incisor hypomineralization (MIH) is a qualitative defect of systemic origin, affecting permanent first molars and often permanent incisors. The treatment modalities can include, amongst others, fissure sealants for prevention of dental caries and composite restorations. Both require adhesion to tooth structure. The aim of this study was to review the literature on the adhesion to enamel affected by MIH.
Material and Methods: A search of PupMed/Medline, ResearchGate and Google Scholar was performed and limited between 2003, when the judgement criteria for MIH were set, and 2016. Thirty-three papers were considered relevant to the subject including five in vivo and six in vitro studies. Studies involving less than ten teeth were excluded.
Results: A four-year clinical trial showed that the application of a total-etch 2-step adhesive system prior to sealant placement is superior to the etch-seal technique. Despite the high success rate of composite restorations shown in three clinical longitudinal studies, there are conflicting results over self-etch being superior to total etch adhesive systems. Pretreating the enamel surface, prior to the adhesive system, with fluoride preventive solutions could reduce the mikroleakage under orthodontic brackets. Three in vitro studies provide inconsistent data about NaOCl pretreating potentials to improve adhesion of composite restorations. Resin infiltration, prior to resin restorations, could improve the microhardness of defected enamel, which may lead to increased bond strength, especially in combination with NaOCl pretreatment.
Conclusions: Adhesion to enamel affected by molar incisor hypomeralization is inferior compared to normal enamel. Sealants applied with the etch-bond-seal technique have greater retention than with the etch-seal technique. Further research is required to provide evidence of the effectiveness of the adhesive system and pretreatment to achieve optimal bonding to MIH.
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Neves AB, Americano GCA, Soares DV, Soviero VM. Breakdown of demarcated opacities related to molar-incisor hypomineralization: a longitudinal study. Clin Oral Investig 2018; 23:611-615. [PMID: 29725848 DOI: 10.1007/s00784-018-2479-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 04/26/2018] [Indexed: 10/17/2022]
Abstract
OBJECTIVES This prospective longitudinal study aimed to evaluate if the occurrence of post-eruptive breakdown of demarcated opacities in hypomineralized teeth is influenced by the color or location of the opacity. MATERIALS AND METHODS Patients diagnosed with molar-incisor hypomineralization (MIH) between 2012 and 2014 were eligible. Two calibrated examiners performed the initial and follow-up evaluations according to European Academy of Paediatric Dentistry (EAPD) criteria. Sixty-five patients were included. Fifty-eight (89.2%), with a mean age of 8.8 years (SD: 1.4), were reassessed after 1 year. Two hundred and nine of 1155 tooth surfaces were considered for the study: 86 with white opacity (OP-W), 91 with yellow opacity (OP-Y), and 32 with enamel breakdown (EB). RESULTS From the OP-W, OP-Y, and EB, 14, 27.5, and 46.9% worsened to breakdown exposing dentin, atypical restoration, or extraction (DB + RA or EXT), respectively. Yellow opacities tended to be more prone to breakdown than white opacities. The occurrence of EB, DB + AR, or EXT was not influenced by the location (p = 0.25). CONCLUSIONS The color of the opacity seems to play an important role on the occurrence of fracture and should be considered as a potential predictor. CLINICAL RELEVANCE Dentists should be aware that demarcated opacities related to MIH tend to fracture over time. Moreover, children with MIH should be seen at shorter intervals.
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Affiliation(s)
- Aline Borburema Neves
- Department of Preventive and Community Dentistry, Pediatric Dental Clinic, Rio de Janeiro State University, Boulevard Vinte e Oito de Setembro, 157, Rio de Janeiro, Brazil.
| | - Gabriela Caldeira Andrade Americano
- Department of Preventive and Community Dentistry, Pediatric Dental Clinic, Rio de Janeiro State University, Boulevard Vinte e Oito de Setembro, 157, Rio de Janeiro, Brazil.,Dental School, Faculdade Arthur Sá Earp Neto, Petrópolis, Brazil
| | - Daniella Varela Soares
- Department of Preventive and Community Dentistry, Pediatric Dental Clinic, Rio de Janeiro State University, Boulevard Vinte e Oito de Setembro, 157, Rio de Janeiro, Brazil
| | - Vera Mendes Soviero
- Department of Preventive and Community Dentistry, Pediatric Dental Clinic, Rio de Janeiro State University, Boulevard Vinte e Oito de Setembro, 157, Rio de Janeiro, Brazil.,Dental School, Faculdade Arthur Sá Earp Neto, Petrópolis, Brazil
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34
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Global burden of molar incisor hypomineralization. J Dent 2018; 68:10-18. [DOI: 10.1016/j.jdent.2017.12.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/04/2017] [Accepted: 12/04/2017] [Indexed: 10/18/2022] Open
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Production and Characterization of Glass-Ceramic Materials for Potential Use in Dental Applications: Thermal and Mechanical Properties, Microstructure, and In Vitro Bioactivity. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7121330] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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36
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Elhennawy K, Manton DJ, Crombie F, Zaslansky P, Radlanski RJ, Jost-Brinkmann PG, Schwendicke F. Structural, mechanical and chemical evaluation of molar-incisor hypomineralization-affected enamel: A systematic review. Arch Oral Biol 2017; 83:272-281. [DOI: 10.1016/j.archoralbio.2017.08.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 07/15/2017] [Accepted: 08/14/2017] [Indexed: 10/19/2022]
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37
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Cochrane NJ, Lo TW, Adams GG, Schneider PM. Quantitative analysis of enamel on debonded orthodontic brackets. Am J Orthod Dentofacial Orthop 2017; 152:312-319. [DOI: 10.1016/j.ajodo.2017.01.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2014] [Revised: 01/01/2017] [Accepted: 01/01/2017] [Indexed: 11/15/2022]
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Kumar H, Palamara JEA, Burrow MF, Manton DJ. An investigation into the effect of a resin infiltrant on the micromechanical properties of hypomineralised enamel. Int J Paediatr Dent 2017; 27:399-411. [PMID: 27813257 DOI: 10.1111/ipd.12272] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Resin infiltration may alter the mechanical properties of enamel hypomineralised lesions (HL); however, variable surface layer (SL) thickness may affect resin penetration. AIMS To determine the thickness of the SL of HL and to investigate the effect of resin infiltration on the mechanical properties of HL. DESIGN The thickness of the SL over HL was determined using polarised light microscopy. Etching time using 15% HCl gel to remove the SL of 52 samples was determined. Selected HL and control areas of 21 teeth were infiltrated with Icon® resin infiltrant, and cross-sectional Knoop microhardness (KHN) measurements were recorded before and after resin infiltration. RESULTS Ninety-six point five per cent of HL had a detectable SL with mean thickness of 58 ± 29 μm. Application of HCl for 120 s produced a mean MIH erosion depth of 58 ± 12 μm. Eleven of 21 samples had evidence of infiltration using visual examination. The infiltrant penetrated some of the HL leading to an increase in KHN (111 ± 75 KHN) which, when compared to adjacent non-infiltrated HL (96 ± 52 KHN), was not statistically significantly different (P = 0.56). CONCLUSIONS There was marked variation in the SL thickness of HL. Resin infiltration of HL did not increase microhardness significantly.
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Affiliation(s)
- Harleen Kumar
- Oral Health Cooperative Research Centre, Melbourne Dental School, The University of Melbourne, Melbourne, Australia.,Boston Children's Hospital and Harvard School of Dental Medicine, Boston, MA, USA
| | | | - Michael Francis Burrow
- Oral Health Cooperative Research Centre, Melbourne Dental School, The University of Melbourne, Melbourne, Australia
| | - David John Manton
- Oral Health Cooperative Research Centre, Melbourne Dental School, The University of Melbourne, Melbourne, Australia
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Hubbard MJ, Mangum JE, Perez VA, Nervo GJ, Hall RK. Molar Hypomineralisation: A Call to Arms for Enamel Researchers. Front Physiol 2017; 8:546. [PMID: 28824445 PMCID: PMC5540900 DOI: 10.3389/fphys.2017.00546] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/14/2017] [Indexed: 11/20/2022] Open
Abstract
Developmental dental defects (DDDs, hereafter “D3s”) hold significance for scientists and practitioners from both medicine and dentistry. Although, attention has classically dwelt on three other D3s (amelogenesis imperfecta, dental fluorosis, and enamel hypoplasia), dental interest has recently swung toward Molar Hypomineralisation (MH), a prevalent condition characterised by well-delineated (“demarcated”) opacities in enamel. MH imposes a significant burden on global health and has potential to become medically preventable, being linked to infantile illness. Yet even in medico-dental research communities there is only narrow awareness of this childhood problem and its link to tooth decay, and of allied research opportunities. Major knowledge gaps exist at population, case and tooth levels and salient information from enamel researchers has sometimes been omitted from clinically-oriented conclusions. From our perspective, a cross-sector translational approach is required to address these complex inadequacies effectively, with the ultimate aim of prevention. Drawing on experience with a translational research network spanning Australia and New Zealand (The D3 Group; www.thed3group.org), we firstly depict MH as a silent public health problem that is generally more concerning than the three classical D3s. Second, we argue that diverse research inputs are needed to undertake a multi-faceted attack on this problem, and outline demarcated opacities as the central research target. Third, we suggest that, given past victories studying other dental conditions, enamel researchers stand to make crucial contributions to the understanding and prevention of MH. Finally, to focus geographically diverse research interests onto this nascent field, further internationalisation of The D3 Group is warranted.
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Affiliation(s)
- Michael J Hubbard
- Department of Paediatrics, University of MelbourneMelbourne, VIC, Australia.,Department of Pharmacology and Therapeutics, University of MelbourneMelbourne, VIC, Australia
| | - Jonathan E Mangum
- Department of Pharmacology and Therapeutics, University of MelbourneMelbourne, VIC, Australia
| | - Vidal A Perez
- Department of Pharmacology and Therapeutics, University of MelbourneMelbourne, VIC, Australia.,Department of Pediatric Stomatology, University of TalcaTalca, Chile
| | - Garry J Nervo
- Department of Pharmacology and Therapeutics, University of MelbourneMelbourne, VIC, Australia
| | - Roger K Hall
- Department of Pharmacology and Therapeutics, University of MelbourneMelbourne, VIC, Australia
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Zhao D, Tsoi JKH, Wong HM, Chu CH, Matinlinna JP. Paediatric Over-the-Counter (OTC) Oral Liquids Can Soften and Erode Enamel. Dent J (Basel) 2017; 5:E17. [PMID: 29563423 PMCID: PMC5806977 DOI: 10.3390/dj5020017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 05/02/2017] [Accepted: 05/09/2017] [Indexed: 11/16/2022] Open
Abstract
This study investigated the softening and erosive effects of various paediatric over-the-counter (OTC) oral liquids on deciduous teeth. Twenty sectioned and polished deciduous enamel blocks were ground on the buccal surface (2 × 2 mm²) and randomly divided into five groups, immersed into four commercially-available paediatric OTC oral liquids (two for paracetamol, both sugared; and two for chlorpheniramine, one sugared and one sugar-free), with deionized water as control. The pH of the oral liquids ranged from 2.50 to 5.77. Each block was immersed into the test or control groups for 15 s, rinsed with deionized water, and Vickers micro-hardness (n = 5) was measured. After twenty cycles of immersion and hardness measurements, Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectrometry (EDS) were used to evaluate the surface morphology and chemistry of the tooth blocks, respectively. The pH values of the liquids were also recorded. Rapidly descending trends in the micro-hardness ratios of the four test groups were observed that were statistically different from the control group (p < 0.001). EDS showed an increase of Ca/C ratio after drug immersion, whereas SEM showed an enamel loss in all the test groups. Paediatric OTC oral liquids could significantly soften the enamel and render them more susceptible to caries, such that the formulation of the oral liquids is the major factor.
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Affiliation(s)
- Dan Zhao
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China.
- School of Stomatology, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - James Kit-Hon Tsoi
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China.
| | - Hai Ming Wong
- Paediatric Dentistry, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China.
| | - Chun Hung Chu
- Operative Dentistry, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China.
| | - Jukka P Matinlinna
- Dental Materials Science, Applied Oral Sciences, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China.
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Analytical evidence of enamel hypomineralisation on permanent and primary molars amongst past populations. Sci Rep 2017; 7:1712. [PMID: 28490768 PMCID: PMC5431767 DOI: 10.1038/s41598-017-01745-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 04/12/2017] [Indexed: 02/06/2023] Open
Abstract
Molar Incisor Hypomineralisation (MIH) and Hypomineralised Second Primary Molars (HSPM) involve prevalent qualitative structural developmental anomalies of tooth enamel affecting the first permanent molars (and often incisors) and the second primary molars, respectively. These demarcated hypomineralised lesions of enamel manifest as white-cream or yellow-brown opacities, with possible post-eruptive localised loss of enamel. Aetiological hypotheses have involved contemporary life factors (i.e. environmental pollutant exposure or early childhood medications) in contrast to factors not limited to a specific time period (i.e. hypoxia at birth or genetic predisposition). Evidence of MIH in ancient populations would reinforce aetiological factors present for many centuries. By means of microtomographic and X-ray fluorescence analyses the present study provides evidence that (i) two archaeological specimens: “S407” (Sains-en-Gohelle, France, 12th–16th centuries) and “B335” (Beauvais, France, 15th–18th centuries) were MIH-affected, and (ii) one individual “S323” was affected by HSPM and MIH (Sains-en-Gohelle, France, 7th–11th centuries).
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Fragelli CMB, Souza JFD, Bussaneli DG, Jeremias F, Santos-Pinto LD, Cordeiro RDCL. Survival of sealants in molars affected by molar-incisor hypomineralization: 18-month follow-up. Braz Oral Res 2017; 31:e30. [PMID: 28489117 DOI: 10.1590/1807-3107bor-2017.vol31.0030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 03/06/2017] [Indexed: 11/22/2022] Open
Abstract
The objective of this study was to evaluate the clinical survival of sealants applied in first permanent molars (FPMs) affected by molar-incisor hypomineralization (MIH), at 18 months of follow-up. Forty-one first permanent molars were selected from 21 children, 6-8 years of age. MIH was classified by one calibrated examiner (kappa = 0.80) according to EAPD criteria. The inclusion criteria were fully erupted FPMs with MIH or sound FPMs (without MIH) for which sealant treatment was indicated. The FPMs were assigned to two groups: CG (control group) and HG (MIH group). Both groups were treated with sealant (FluroShield). Clinical follow-up was performed from baseline to 18 months to assess anatomical form, marginal adaptation, retention and presence of caries, according to criteria set by the United States Public Health Service-Modified, and was conducted by a blinded examiner (kappa = 0.80). The actuarial method was used to evaluate the survival of the sealants. The survival rates for the groups were compared using Fisher's exact test (α = 5%). The cumulative survival rates were 81% at 1 month, 68.8% at 6 months, 68.8% at 12 months, and 62.6% at 18 months for CG, and 88% at 1 month, 84% at 6 months, 76% at 12 months, and 72% at 18 months for HG. No significant difference was found between the groups. The sealants in molars affected by MIH presented a survival rate similar to the sealants in the control, suggesting that sealants may be an adequate approach for preventing carious lesions in MIH-affected molars.
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Affiliation(s)
- Camila Maria Bullio Fragelli
- Universidade do Estado de São Paulo - Unesp, Araraquara Dental School, Department of Orthodontics and Pediatric Dentistry, Araraquara, São Paulo, Brazil
| | - Juliana Feltrin de Souza
- Universidade Federal do Paraná - UFPR, School of Dentistry, Department of Stomatology, Curitiba, Paraná, Brazil
| | - Diego Girotto Bussaneli
- Universidade do Estado de São Paulo - Unesp, Araraquara Dental School, Department of Orthodontics and Pediatric Dentistry, Araraquara, São Paulo, Brazil
| | - Fabiano Jeremias
- Universidade do Estado de São Paulo - Unesp, Araraquara Dental School, Department of Orthodontics and Pediatric Dentistry, Araraquara, São Paulo, Brazil
| | - Lourdes Dos Santos-Pinto
- Universidade do Estado de São Paulo - Unesp, Araraquara Dental School, Department of Orthodontics and Pediatric Dentistry, Araraquara, São Paulo, Brazil
| | - Rita de Cássia Loiola Cordeiro
- Universidade do Estado de São Paulo - Unesp, Araraquara Dental School, Department of Orthodontics and Pediatric Dentistry, Araraquara, São Paulo, Brazil
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Silva MJ, Kilpatrick N, Crombie F, Ghanim A, Manton D. What's new in molar incisor hypomineralization? ACTA ACUST UNITED AC 2017. [DOI: 10.12968/denu.2017.44.2.100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mihiri J Silva
- Department of Paediatrics, University of Melbourne and Murdoch Children's Research Institute, Institute, Melbourne, Australia
| | - Nicky Kilpatrick
- Director, Cleft Services, Royal Children's Hospital, Senior Research Fellow, Murdoch Children's Research Institute, Melbourne, Australia
| | - Felicity Crombie
- PhD Lecturer, Oral Health CRC, Melbourne Dental School, The University of Melbourne, Parkville, Victoria, Australia
| | - Aghareed Ghanim
- PhD Clinical Senior Fellow, Oral Health CRC, Melbourne Dental School, The University of Melbourne, Parkville, Victoria, Australia
| | - David Manton
- Elsdon Storey Chair of Child Dental Health, Oral Health CRC, Melbourne Dental School, The University of Melbourne, Parkville, Victoria, Australia
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Simsek H, Gurbuz T, Buyuk SK, Ozdemir Y. Evaluation of Mineral Content and Photon Interaction Parameters of Dental Enamel After Phosphoric Acid and Er:YAG Laser Treatment. Photomed Laser Surg 2017; 35:270-277. [PMID: 28121513 DOI: 10.1089/pho.2016.4190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The purpose of this study was to evaluate the effects of laser and acid etching on the mineral content and photon interaction parameters of dental enamel in human teeth. BACKGROUND DATA The composition of dental enamel may vary, especially at the surface, depending on the reactions that occur during dental treatment. MATERIALS AND METHODS Forty maxillary premolars were divided randomly into 2 groups of 20 teeth. In the first group, half of teeth crowns were etched by using 37% phosphoric acid; in the second group, half of teeth crowns were etched by using an erbium:yttrium-aluminum-garnet (Er:YAG) laser. The remaining half crowns in each group were used as untreated controls. We characterized the calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na), and potassium (K) contents in each specimen by using wavelength dispersive X-ray fluorescence spectrometry. The total atomic cross-section ([Formula: see text]), effective atomic number ([Formula: see text]), and electron density (Ne) of the tooth samples were determined at photon energies of 22.1, 25, 59.5, and 88 keV by using a narrow beam transmission method. Data were analyzed statistically by using the Mann-Whitney U test. RESULTS The mineral contents after Er:YAG laser and phosphoric acid etching did not differ significantly (p > 0.05), and no significant variation in [Formula: see text], [Formula: see text], or Ne was observed. CONCLUSIONS Therefore, we conclude that the Er:YAG laser and phosphoric acid systems used in this study did not affect mineral composition or photon interaction parameters of dental enamel.
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Affiliation(s)
- Huseyin Simsek
- 1 Department of Pedodontics, Faculty of Dentistry, Ordu University , Ordu, Turkey
| | - Taskın Gurbuz
- 2 Department of Pedodontics, Faculty of Dentistry, Ataturk University , Erzurum, Turkey
| | | | - Yuksel Ozdemir
- 4 Department of Physics, Faculty of Arts and Sciences, Ataturk University , Erzurum, Turkey
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Ortega EMM, Lemonte AJ, Cordeiro GM, Cancho VG, Mialhe FL. Heteroscedastic log-exponentiated Weibull regression model. J Appl Stat 2017. [DOI: 10.1080/02664763.2016.1277192] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Edwin M. M. Ortega
- Departamento de Ciências Exatas, Universidade de S ao Paulo, Piracicaba, Brazil
| | - Artur J. Lemonte
- Departamento de Estatística, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - Gauss M. Cordeiro
- Departamento de Estatística, Universidade Federal de Pernambuco, Recife, Brazil
| | - Vicente G. Cancho
- Instituto de Ciências Matemáticas e Computação, Universidade de São Paulo, São Carlos, Brazil
| | - Fábio L. Mialhe
- Departamento de Odontologia Social, Universidade Estadual de Campinas, Campinas, Brazil
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Garot E, Couture-Veschambre C, Manton D, Rodriguez V, Lefrais Y, Rouas P. Diagnostic guide enabling distinction between taphonomic stains and enamel hypomineralisation in an archaeological context. Arch Oral Biol 2016; 74:28-36. [PMID: 27865101 DOI: 10.1016/j.archoralbio.2016.11.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 11/08/2016] [Accepted: 11/09/2016] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Molar Incisor Hypomineralisation (MIH) is a structural anomaly that affects the quality of tooth enamel and has important consequences for oral health. The developmentally hypomineralised enamel has normal thickness and can range in colour from white to yellow or brown with or without surface breakdown. The possibility of finding MIH in 'ancient populations' could downplay several current aetiological hypotheses (e.g., dioxin derivatives, bisphenols, antibiotics) without excluding the possible multifactorial aspect of the anomaly. In an archaeological context, chemical elements contained in the burial ground can stain teeth yellow or brown and therefore might create a taphonomic bias. The purpose of the present study is to test a proposed diagnostic guide enabling determination of the pathological or taphonomic cause of enamel discolouration and defects that resemble MIH present on 'ancient teeth'. DESIGN Two sample groups including MIH discoloration (n=12 teeth) from living patients, taphonomic discoloration (n=9 teeth) and unknown discoloration (n=2 teeth) from medieval specimens were tested. Three non-destructive methods-Raman spectroscopy, X-ray micro-computed tomography and X-ray fluorescence were utilised. RESULTS Hypomineralised enamel has decreased mineral density (p<0.0001) and increased phosphate/β-carbonate ratio (p<0.01) compared to normal enamel whereas relative concentrations of manganese, copper, iron and lead are similar. In taphonomic discoloration, relative concentrations of these elements are significantly different (p<0.05) to normal enamel whereas mineral density and Raman spectra profile are comparable. CONCLUSIONS Enamel hypomineralisation can be distinguished from taphonomic staining in archaeological teeth.
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Affiliation(s)
- Elsa Garot
- Université de Bordeaux, UFR des Sciences Odontologiques, Bordeaux, France; Université de Bordeaux, PACEA, UMR 5199, Pessac, France.
| | | | - David Manton
- Melbourne Dental School, University of Melbourne, Victoria, Australia
| | | | - Yannick Lefrais
- Université Bordeaux Montaigne, CRP2A, UMR 5060, Pessac, France
| | - Patrick Rouas
- Université de Bordeaux, UFR des Sciences Odontologiques, Bordeaux, France; Université de Bordeaux, PACEA, UMR 5199, Pessac, France
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Elhennawy K, Schwendicke F. Managing molar-incisor hypomineralization: A systematic review. J Dent 2016; 55:16-24. [PMID: 27693779 DOI: 10.1016/j.jdent.2016.09.012] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/22/2016] [Accepted: 09/27/2016] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES We systematically reviewed treatment modalities for MIH-affected molars and incisors. DATA Trials on humans with ≥1 MIH molar/incisor reporting on various treatments were included. Two authors independently searched and extracted records. Sample-size-weighted annual failure rates were estimated where appropriate. The risk of bias was assessed using the Newcastle-Ottawa scale. SOURCES Electronic databases (PubMed, Embase, Cochrane CENTRAL, Google Scholar) were screened, and hand searches and cross-referencing performed. STUDY SELECTION Fourteen (mainly observational) studies were included. Ten trials (381 participants) investigated MIH-molars, four (139) MIH-incisors. For molars, remineralization, restorative or extraction therapies had been assessed. For restorative approaches, mean (SD) annual failure rates were highest for fissure sealants (12[6]%) and glass-ionomer restorations (12[2]%), and lowest for indirect restorations (1[3]%), preformed metal crowns (1.3 [2.1]%) and composite restorations (4[3]%). Ony study assessed extraction of molars in young patients (median age 8.2 years), the majority of them without malocclusions, but third molars in development. Spontaneous alignment of second molars was more frequent in the maxilla (55%) than the mandible (47%). For incisors, desensitizing agents successfully managed hypersensitivity. Micro-abrasion and composite veneers improved aesthetics. CONCLUSIONS Few, mainly moderate to high-risk-studies investigated treatment of MIH. Remineralization or sealants seem suitable for MIH-molars with limited severity and/or hypersensitivity. For severe cases, restorations with composites or indirect restorations or preformed metal crowns seem suitable. Prior to tooth extraction as last resort factors like the presence of a general malocclusion, patients' age and the status of neighboring teeth should be considered. No recommendations can be given for MIH-incisors. CLINICAL SIGNIFICANCE Dentists need to consider the specific condition of each tooth and the needs and expectations of patients when deciding how to manage MIH. Strong recommendations are not possible based on the current evidence.
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Affiliation(s)
- Karim Elhennawy
- Charité Center for Dental Medicine, Department of Orthodontics, Dentofacial Orthopedics and Pedodontics, Charité-Universitätsmedizin Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Falk Schwendicke
- Charité Centre for Dental Medicine, Department of Operative and Preventive Dentistry, Charité-Universitätsmedizin Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
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Kopperud SE, Pedersen CG, Espelid I. Treatment decisions on Molar-Incisor Hypomineralization (MIH) by Norwegian dentists - a questionnaire study. BMC Oral Health 2016; 17:3. [PMID: 27430640 PMCID: PMC4948099 DOI: 10.1186/s12903-016-0237-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 06/15/2016] [Indexed: 11/28/2022] Open
Abstract
Background The study aimed to explore the variability between the treatment decisions dentists make for MIH-affected teeth. Methods In 2009, a pre-coded questionnaire was sent electronically to all dentists employed by the Public Dental Service (PDS) in Norway (n = 1061). The questions were related to treatment of MIH-affected teeth, including three patient cases illustrated by photographs and written case descriptions. Results Replies were obtained from 61.5 % of the respondents after two reminders. In the first case, showing a newly erupted first permanent molar with moderate hypomineralization and no disintegration of the surface enamel, the preferred treatment among the majority of the respondents (53.5 %) was application of fluoride varnish, while 19.6 % would seal the fissure with GIC material. In the second case, showing a severely damaged first permanent molar in a six year old child, more than half of the respondents (57.5 %) would place a conventional glass ionomer restoration and 10.5 % would use a stainless steel crown (SSC). In the third case, showing a severely damaged permanent first molar in a nine year old child, 43.8 % of the dentists would remove only the parts with soft, damaged enamel; while 35.2 % would remove more and 21.0 % would remove all affected enamel and leave the cavity margins in sound enamel. Conclusions The survey shows that there is a wide disparity between clinicians’ views on how MIH affected teeth should be treated. In a severely affected first permanent molar, only a minority of dentists would remove as much tooth substance as needed to get the full benefit of the acid etch pattern in sound enamel.
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Affiliation(s)
- Simen E Kopperud
- Department of Paediatric Dentistry and Behavioural Science, Faculty of Dentistry, University of Oslo, P.O. Box 1109, Blindern, NO-0317, Oslo, Norway.,Nordic Institute of Dental Materials (NIOM), Oslo, Norway
| | - Cecilie Gravdahl Pedersen
- Department of Paediatric Dentistry and Behavioural Science, Faculty of Dentistry, University of Oslo, P.O. Box 1109, Blindern, NO-0317, Oslo, Norway
| | - Ivar Espelid
- Department of Paediatric Dentistry and Behavioural Science, Faculty of Dentistry, University of Oslo, P.O. Box 1109, Blindern, NO-0317, Oslo, Norway.
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Ţălu Ş, Contreras–Bulnes R, Morozov IA, Rodríguez-Vilchis LE, Montoya-Ayala G. Surface nanomorphology of human dental enamel irradiated with an Er:YAG laser. LASER PHYSICS 2015. [DOI: 10.1088/1054-660x/26/2/025601] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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50
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Bullio Fragelli CM, Jeremias F, Feltrin de Souza J, Paschoal MA, de Cássia Loiola Cordeiro R, Santos-Pinto L. Longitudinal Evaluation of the Structural Integrity of Teeth Affected by Molar Incisor Hypomineralisation. Caries Res 2015; 49:378-83. [DOI: 10.1159/000380858] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 02/10/2015] [Indexed: 11/19/2022] Open
Abstract
The aim of this prospective cohort study was to evaluate the risk of posteruptive breakdown and the development of caries lesions in teeth with molar incisor hypomineralisation (MIH). A total of 367 permanent incisors and first molars, affected and not affected by MIH lesions, of 45 children with MIH from Araraquara, São Paulo, Brazil, were evaluated at intervals from 6 to 12 months by assessing the severity of MIH, the presence of tooth caries lesions and the treatment needed. During the study period, all patients received preventive care. The data were analysed using Fisher's exact test and actuarial method survival analysis. Significant associations were also found in teeth between the presence of MIH and a DMFT index >0 in all periods and also between the need for treatment and the presence of MIH. The teeth affected by MIH opacities were healthy in 99% of incisors and 93% of molars at the end of the 12-month period. Due to the high likelihood of maintaining the tooth structure in opacities, the complete or premature removal of the affected area is not justified.
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