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Shimoyama M, Kanzaki H, Tohyama S, Ida T, Ishikawa M, Katsumata Y, Arai C, Wada S, Manase S, Tomonari H. Mandibular Endochondral Growth Is Specifically Augmented by Nutritional Supplementation with Myo-Inositol Even in Rabbits. Dent J (Basel) 2024; 12:49. [PMID: 38534273 DOI: 10.3390/dj12030049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 02/14/2024] [Accepted: 02/23/2024] [Indexed: 03/28/2024] Open
Abstract
Mandibular retrognathism occurs by insufficient mandibular growth and causes several issues, such as respiratory difficulty and diminished masticatory function. At present, functional orthodontic appliances are used for stimulating mandibular growth in pediatric cases. However, the effectiveness of functional appliances is not always stable in daily practices. A more effective, reliable, and safer therapeutic method for mandibular growth promotion would be helpful for growing mandibular retrognathism patients. As we previously discovered that nutritional supplementation of myo-inositol in growing mice specifically increases mandibular endochondral growth, we performed preclinical animal experiments in rabbits in this study. Briefly, six-week-old male Japanese white rabbits were fed with or without myo-inositol supplementation in laboratory chow until 25 weeks old, and 3D image analysis using micro CT data and histological examinations was done. Myo-inositol had no systemic effect, such as femur length, though myo-inositol specifically augmented the mandibular growth. Myo-inositol increased the thickness of mandibular condylar cartilage. We discovered that the nutritional supplementation of myo-inositol during the growth period specifically augmented mandibular growth without any systemic influence, even in rabbits. Our results suggest the possibility of clinical use of myo-inositol for augmentation of the mandibular growth in growing mandibular retrognathism patients in the future.
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Affiliation(s)
- Miho Shimoyama
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Hiroyuki Kanzaki
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Syunnosuke Tohyama
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Tomomi Ida
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Misao Ishikawa
- Department of Anatomy, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Yuta Katsumata
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Chihiro Arai
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Satoshi Wada
- Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Kanazawa 920-0293, Japan
| | - Shugo Manase
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
| | - Hiroshi Tomonari
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
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Ishikawa M, Kanzaki H, Kodera R, Sekimizu T, Wada S, Tohyama S, Ida T, Shimoyama M, Manase S, Tomonari H, Kuroda N. Early diagnosis of aortic calcification through dental X-ray examination for dental pulp stones. Sci Rep 2023; 13:18576. [PMID: 37903847 PMCID: PMC10616172 DOI: 10.1038/s41598-023-45902-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 10/25/2023] [Indexed: 11/01/2023] Open
Abstract
Vascular calcification, an ectopic calcification exacerbated by aging and renal dysfunction, is closely associated with cardiovascular disease. However, early detection indicators are limited. This study focused on dental pulp stones, ectopic calcifications found in oral tissues that are easily identifiable on dental radiographs. Our investigation explored the frequency and timing of these calcifications in different locations and their relationship to aortic calcification. In cadavers, we examined the association between the frequency of dental pulp stones and aortic calcification, revealing a significant association. Notably, dental pulp stones appeared prior to aortic calcification. Using a rat model of hyperphosphatemia, we confirmed that dental pulp stones formed earlier than calcification in the aortic arch. Interestingly, there were very few instances of aortic calcification without dental pulp stones. Additionally, we conducted cell culture experiments with vascular smooth muscle cells (SMCs) and dental pulp cells (DPCs) to explore the regulatory mechanism underlying high phosphate-mediated calcification. We found that DPCs produced calcification deposits more rapidly and exhibited a stronger augmentation of osteoblast differentiation markers compared with SMCs. In conclusion, the observation of dental pulp stones through X-ray examination during dental checkups could be a valuable method for early diagnosis of aortic calcification risk.
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Affiliation(s)
- Misao Ishikawa
- Department of Anatomy, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa Pref., 230-8501, Japan.
| | - Hiroyuki Kanzaki
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Ryo Kodera
- Department of Anatomy, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa Pref., 230-8501, Japan
| | - Takehiro Sekimizu
- Department of Anatomy, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa Pref., 230-8501, Japan
| | - Satoshi Wada
- Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Kanazawa, Japan
| | - Syunnosuke Tohyama
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Tomomi Ida
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Miho Shimoyama
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Shugo Manase
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Hiroshi Tomonari
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Noriyuki Kuroda
- Department of Anatomy, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa Pref., 230-8501, Japan
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