Rena Okawa

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Oral management with mouthguards during the mixed dentition period: A case report

Masatoshi Otsugu, Yuto Suehiro, Issei Hanaoka, Rena Okawa, more

Dental Traumatology > 37 > 3 > 531 - 536

Custom‐made mouthguards are widely used by athletes during training and sporting events for the prevention of oral injuries. However, even though the prevalence of dental injuries in children in the primary or mixed dentition stages is high, few reports have focused on mouthguard use for such cases due to the difficulties associated with adapting them as teeth are lost and replaced. This report presents...

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Oral findings in patient with lethal hypophosphatasia treated with enzyme replacement therapy

Rena Okawa, Kazuma Kokomoto, Natsumi Yamamura-Miyazaki, Toshimi Michigami, more

Pediatric Dental Journal > 2017 > 27 > 3 > 153-156

Hypophosphatasia (HPP) is a skeletal disorder, with hypocalcification of bone and early exfoliation of primary teeth displayed in affected individuals. We report here a 3-year-old female diagnosed with perinatal HPP who had received enzyme replacement therapy starting from 1 day after birth. Oral and radiographic examinations revealed deep periodontal pockets, severe mobility, and dentinogenesis imperfecta...

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Early exfoliation of permanent tooth in patient with hypophosphatasia

Rena Okawa, Jiro Miura, Kazuma Kokomoto, Takuo Kubota, more

Pediatric Dental Journal > 2017 > 27 > 3 > 173-178

Hypophosphatasia (HPP) is a rare inherited skeletal disorder caused by mutations in the ALPL gene encoding tissue-nonspecific alkaline phosphatase, with early exfoliation of primary teeth due to disturbed formation of cementum often recognized as a major dental manifestation. However, reports regarding permanent teeth in HPP cases are scant.An 11-year-old boy diagnosed with childhood type HPP was...

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Oral manifestations of Japanese patients with osteogenesis imperfecta

Rena Okawa, Takuo Kubota, Taichi Kitaoka, Kazuma Kokomoto, more

Pediatric Dental Journal > 2017 > 27 > 2 > 73-78

Osteogenesis imperfecta is a rare inherited skeletal disease known to be associated with oral problems. In the present study, we investigated the oral condition of Japanese patients with osteogenesis imperfecta using a nationwide survey.A total of 534 clinics were surveyed by questionnaire, including 69 clinics registered to train paediatric dentists and 465 registered to train oral surgeons, to determine...

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Epulis fibrosa identified in a 6-year-old Japanese girl

Masakazu Hamada, Ayako Takasu, Ryota Nomura, Rena Okawa, more

Pediatric Dental Journal > 2016 > 26 > 1 > 42-44

Epulis is a relatively common benign polypoid lesion that generally appears in the gingiva of individuals aged between 20 and 50 years. A 6-year-old Japanese girl came to our hospital for consultation regarding swelling of the marginal gingiva in the region between the maxillary left deciduous lateral incisor and canine. An intraoral examination revealed that the surface of the swollen mass was nonulcerated...

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Lowe syndrome oral findings: Case report

Rena Okawa, Shuhei Naka, Kanae Saga, Kazuhiko Nakano

Pediatric Dental Journal > 2016 > 26 > 1 > 34-37

Lowe syndrome is an X-linked recessive disorder characterized by anomalies of the eye, nervous system, and kidney, and caused by a mutation of the oculocerebrorenal gene (OCRL1) on the X-chromosome. Dental manifestations are associated with rickets due to renal dysfunction. A 2-year-1-month-old boy with Lowe syndrome came to our clinic for consultation in regard to mobility of the primary mandibular...

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Hypoplasia in crown of primary mandibular left lateral incisor identified in infant Japanese girl

Rena Okawa, Shuhei Naka, Kanae Saga, Ryota Nomura, more

Pediatric Dental Journal > 2014 > 24 > 2 > 129-131

A girl aged 0 years 11 months was referred to our clinic by a local pediatrician for examination of a missing tooth crown of a primary mandibular left lateral incisor. Our intraoral examination showed that seven primary incisors had emerged into the oral cavity, while no tooth crown was noted in the region of the primary mandibular left lateral incisor. A calcified structure was identified close to...

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Delayed eruption of mandibular primary central incisors in a child with severe lingual inclination and their spontaneous movement to appropriate positions

Rena Okawa, Shuhei Naka, Miharu Higashino, Ryota Nomura, more

Pediatric Dental Journal > 2014 > 24 > 2 > 120-123

We previously reported a quite uncommon case of delayed eruption of primary mandibular bilateral incisors with severe lingual inclination identified in a Japanese girl aged 2 years 8 months. An intraoral examination demonstrated the tooth crown morphology of the primary mandibular incisors in the lingual submucosal area, while radiographic examinations of the affected teeth revealed what appeared...

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Long-term follow-up of delayed development of maxillary right second premolar with inversely positioned corresponding primary molar

Rena Okawa, Shuhei Naka, Ayuchi Kojima, Hidekazu Sasaki, more

Pediatric Dental Journal > 2013 > 23 > 1 > 62-65

Impaction is defined as a condition in which a tooth fails to erupt within a normal range of functional position. The condition is generally found in permanent teeth, while impaction of primary teeth is considered to be uncommon. We previously presented a rare case of delayed development of a maxillary right second premolar with an inversely positioned corresponding primary molar identified in a girl...

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Horizontal impaction of primary mandibular bilateral central incisors identified in 2-year-8-month-old girl

Rena Okawa, Shuhei Naka, Kazuyo Fujita, Suguru Sakashita, more

Pediatric Dental Journal > 2013 > 23 > 1 > 66-69

A girl aged 2 years and 8 months came to our clinic for consultation with regard to unerupted primary mandibular bilateral central incisors. An intraoral examination revealed that the teeth had not emerged into the oral cavity and showed a tooth crown morphology similar to that of the primary mandibular incisors, which appeared in the lingual submucosal area outside of the mandibular dental arch....

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Oral manifestations of patients with hypophosphatasia

Rena Okawa, Kazuhiko Nakano, Michiyo Matsumoto, Keiko Kawabata, more

Pediatric Dental Journal > 2012 > 22 > 2 > 155-162

Hypophosphatasia is a rare inherited disorder characterized by defective bone mineralization and deficiency of tissue non-specific alkaline phosphatase (TNSALP) activity. The disease is caused by mutations in the liver/bone/kidney alkaline phosphatase gene (ALPL) encoding TNSALP. As for dental manifestations, premature loss of deciduous teeth due to disturbed cementum formation is well known. However,...

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Evaluation of factors related to nursing caries in 18-month-old Japanese children

Rena Okawa, Kazuhiko Nakano, Aki Yamana, Naoko Nishikawa, more

Pediatric Dental Journal > 2011 > 21 > 1 > 49-55

Dental caries in early childhood is a significant public health problem, among which nursing caries is known to be caused by inappropriate nursing habits. The aim of the present study was to investigate lifestyle factors related to nursing caries. We examined 2,506 Japanese children aged 18 months, as a part of public health examinations conducted by the Municipal Public Health Center in 2008. Questionnaires...

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Successful application of molecular biological technique for evaluation of changes in periodontopathic bacteria in Japanese children with developmental disabilities

Arifah Chieko Ardin, Kazuhiko Nakano, Aki Yamana, Rena Okawa, more

Pediatric Dental Journal > 2011 > 21 > 1 > 56-62

Developments in molecular biological techniques enables rapid and easy identification of periodontopathic bacterial species in clinical specimens. However, there are few reports regarding their application for community dentistry. The aim of this study was to show successful application of a molecular biological technique for evaluation of changes in periodontal bacterial species in children at daycare...

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Radiolucent lesion identified in unerupted mandibular left first permanent molar: Case report and literature review

Aki Yamana, Kazuhiko Nakano, Hidekazu Sasaki, Rena Okawa, more

Pediatric Dental Journal > 2010 > 20 > 2 > 207-211

Intracoronal resorption in an unerupted developing tooth is rare and most lesions of this type are incidentally found in radiographs taken for other purposes. A 5Y10M-old girl was referred to our clinic by a general practitioner for detailed examination of radiolucency identified in the unerupted mandibular left first permanent molar. Intraoral examination revealed that the affected tooth was unerupted,...

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Morphological examination of impacted tooth in maxillary lateral incisor region using computed tomography for consideration of treatment modalities

Hidekazu Sasaki, Kazuhiko Nakano, Aki Yamana, Naho Taniguchi, more

Pediatric Dental Journal > 2010 > 20 > 2 > 189-195

A 10Y2M-old girl was referred to our clinic by a general practitioner for consultation regarding an impacted supernumerary tooth identified in the maxillary left incisor region. Our intraoral examination revealed a maxillary left lateral incisor with a tubercle morphology, with slight swelling identified in the labial gingival area between the lateral incisor and primary canine. The dental age of...

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Developmental anomalies of permanent teeth identified in children who received chemotherapy: Report of three cases

Ryota Nomura, Kazuhiko Nakano, Satoko Inagaki, Naho Taniguchi, more

Pediatric Dental Journal > 2010 > 20 > 2 > 216-221

Childhood cancer, such as that manifested by neuroblastoma and hepatoblastoma tumors, is one of the leading causes of death for young children. Chemotherapy is one of the most important approaches available, though it is considered to cause tooth developmental disturbances when patients receive treatment during that period of development. Microdontia, disturbed root development, hypodontia and enamel...

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Bacterial profiles of oral streptococcal and periodontal bacterial species in saliva specimens from Japanese subjects

Eriko Miyamoto, Kazuhiko Nakano, Kazuyo Fujita, Ryota Nomura, more

Archives of Oral Biology > 2009 > 54 > 4 > 374-379

Recent developments in molecular biological techniques have increased understanding of the distribution of oral bacterial species in clinical specimens, though few investigations have been conducted to simultaneously detect oral streptococcal and periodontal species in the same specimens. The purpose of the present study was to investigate the distribution and correlation of 6 oral streptococcal and...

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Inverted maxillary second primary molar and permanent successor teeth: X-ray photographic evaluations

Rena Okawa, Kazuhiko Nakano, Ryota Nomura, Kazuyo Fujita, more

Pediatric Dental Journal > 2009 > 19 > 1 > 123-129

A 10-year-and-4-month old girl was shown to have inverted maxillary right second primary molar and permanent successor teeth, after being referred to our clinic for examination of an unerupted maxillary right second primary molar. Orthopantomograph images taken at the age of 7Y4M showed an impacted maxillary second primary molar and ambiguous tooth germ of its permanent successor, while images obtained...

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Suspected cerebral gigantism diagnosed by dental examination

Rena Okawa, Katsuhiko Masuda, Kazuhiko Nakano, Shuhei Naka, more

Pediatric Dental Journal > 2009 > 19 > 2 > 247-251

Cerebral gigantism is an overgrowth disorder that occurs from the prenatal stage through childhood and features such clinical symptoms as advanced bone age, macrocephaly, characteristic facial appearance, and learning difficulties. A 4-year 3-month-old girl was referred to our clinic for consultation regarding anterior crossbite and occlusal pain in the molar region. An intraoral examination showed...

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Impacted primary second molar with odontoma identified in the adjacent tissue

Naofumi Kamakura, Kazuhiko Nakano, Rena Okawa, Ryota Nomura, more

Pediatric Dental Journal > 2009 > 19 > 1 > 117-122

A case of impacted tooth due to the presence of an odontoma identified in a 5Y7M-old girl is presented. An intraoral examination showed that the maxillary right second primary molar had not emerged into the oral cavity, while a periapical X-ray photograph revealed a small round radiopaque mass with a diameter of approximately 2mm. The calcified mass was suspected to interfere with eruption of the...

INFONA - science communication portal

Search results for: Rena Okawa

Oral management with mouthguards during the mixed dentition period: A case report

Oral findings in patient with lethal hypophosphatasia treated with enzyme replacement therapy

Early exfoliation of permanent tooth in patient with hypophosphatasia

Oral manifestations of Japanese patients with osteogenesis imperfecta

Epulis fibrosa identified in a 6-year-old Japanese girl

Lowe syndrome oral findings: Case report

Hypoplasia in crown of primary mandibular left lateral incisor identified in infant Japanese girl

Delayed eruption of mandibular primary central incisors in a child with severe lingual inclination and their spontaneous movement to appropriate positions

Long-term follow-up of delayed development of maxillary right second premolar with inversely positioned corresponding primary molar

Horizontal impaction of primary mandibular bilateral central incisors identified in 2-year-8-month-old girl

Oral manifestations of patients with hypophosphatasia

Evaluation of factors related to nursing caries in 18-month-old Japanese children

Successful application of molecular biological technique for evaluation of changes in periodontopathic bacteria in Japanese children with developmental disabilities

Radiolucent lesion identified in unerupted mandibular left first permanent molar: Case report and literature review

Morphological examination of impacted tooth in maxillary lateral incisor region using computed tomography for consideration of treatment modalities

Developmental anomalies of permanent teeth identified in children who received chemotherapy: Report of three cases

Bacterial profiles of oral streptococcal and periodontal bacterial species in saliva specimens from Japanese subjects

Inverted maxillary second primary molar and permanent successor teeth: X-ray photographic evaluations

Suspected cerebral gigantism diagnosed by dental examination

Impacted primary second molar with odontoma identified in the adjacent tissue

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