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Volume 51 (2013)
- Issue 4 Pages 429-
- Issue 3 Pages 317-
- Issue 2 Pages 153-
- Issue 1 Pages 1-
Volume 51, Issue 1
Displaying 1-6 of 6 articles from this issue
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ORIGINAL ARTICLE
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Yuichiro TOKUNAGA, Takashi NAKANO, Kazuo KATO, Osamu FUKUTA2013 Volume 51 Issue 1 Pages 1-7
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSWe investigated fluoride release and recharge capabilities of orthodontic resin containing surface pre-reacted glass-ionomer (S-PRG) filler, using 5 sets of 7-resin samples containing S-PRG filler at 0,5, 10, 20, or 30 wt%. Samples were immersed in distilled water from day 1 to 6. The water was changed every 24 hours and the amount of fluoride released was determined. From day 6 to 10, the samples were immersed in a fluoride solution (1,000 ppm) for 8 hours to recharge the fluoride and then in distilled water for 16 hours to determine the amount released. From day 11 to 15, the samples were again immersed in distilled water to estimate the fluoride release capabilities of the materials. Secondary electron images were obtained to assess the mixed state of the filler of a sample polymer containing 30 wt% S-PRG, while backscattered electron images were taken to observe the surface structure of the materials before and after the experiment.Our results revealed the following :1.Regardless of fluoride recharging, the amount of fluoride released was increased with an increasing percentage of S-PRG, with significant differences seen between 5 wt% and 20 wt%, 5 wt% and 30 wt%, and 10 wt% and 30 wt%.2.The amount of fluoride released appeared to decrease after repeated recharging. However, no significant reduction in the amount released was observed in samples containing 30 wt% S-PRG.3.Backscattered electron images obtained before and after the experiment showed uniformly dispersed S-PRG filler with occasional aggregates in polymerized resin. No filler fallout or breakdown was observed on the surface of the resin samples.View full abstractDownload PDF (863K) -
Kie MATSUDA, Yusuke RYU, Junko SHIMOMURA-KUROKI2013 Volume 51 Issue 1 Pages 8-20
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSThe range of activities performed by children has been changing, while the types of childhood trauma also vary. Along this line, it is speculated that young patients suffering from oral trauma are gradually increasing. In the present study, we analyzed the records of child patients who visited the pediatric dental clinic of Nippon Dental University Niigata Hospital from 2008 to 2011 with a traumatic dental injury.1.The general age distribution of patients who had primary teeth, permanent teeth, and soft tissue injuries was 1-3, 7-11, and 1-4 years old, respectively.2.More than half of the patients were admitted on the day of injury.3.Most of the patients were injured in the afternoon.4.The main cause of trauma was falling down.5.The maxillary central incisors were the most frequently affected in both primary and permanent dentition.6.The frequency of re-injury was 2.3% in primary and 21.6% in permanent dentition.7.The most common type of trauma in primary and permanent dentition was dislocation and crown fracture, respectively.8.The maxillary and mandible lips were the most frequently affected soft tissues.9.Trauma in primary dentition was observed without treatment in most cases, while endodontic treatments and crown restoration showed increases for cases of trauma in permanent dentition.View full abstractDownload PDF (1037K) -
Fumiko HAYASHI, Chieko MITSUHATA, Mihaya ARIKI, Satoko OMOTO, Ryoko HI ...2013 Volume 51 Issue 1 Pages 21-27
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSThe aim of the present study was to clarify the status of dental treatments given for intellectually disabled patients at the Department of Pediatric Dentistry of Hiroshima University Hospital during the 1-year period from April 2009 to March 2010. A total of 315 such patients (208 males, 107 females) received dental treatments, representing 13.4% of the total visits during the study period. This percentage is larger than that found in our previous study conducted in 2004. The age of the patients ranged from 0 to 44 years, with those between 7 and 12 years of age the most numerous (38.1%). The most common causes of intellectual disability were autism (42.5% of all patients), mental retardation (25.7%), and Down syndrome (10.2%). The most common dental treatments performed were scaling (25.9% of all dental treatments) and cavity filling (18.7%). Behavior management at least once during the study period was required for 190 patients (60.3%), which is a greater percentage than that found in our previous study (p＜0.05).View full abstractDownload PDF (732K)
CASE REPORT
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Case ReportNaoko FUKASE, Hiroe KODAIRA, Katsuya MORIYASU, Yoshinobu ASADA2013 Volume 51 Issue 1 Pages 28-35
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSA simple bone cyst of the jaw is rare in children younger than 10 years. Here, we present an unusual case in the mandible of a 7-year-old boy. A simple cyst was incidentally detected in the jaw during a radiographic examination for caries treatment at the age of 7. Panoramic radiograph findings revealed a broad radiolucent lesion area beneath the mandibular left second premolar, in which root formation was incomplete. Both marsupialization and a histopathological examination were performed under local anesthesia.Three months after the operation, the radiolucent lesion showed a size reduction tendency. Occlusal guidance was performed with a lateral expansion appliance to correct the maxillary space shortage and a removable space maintainer was applied to maintain the space of the unerupted mandibular premolars at 6 months after the operation. One year after the operation, the radiolucent lesion showed a gradual decrease and new bone was developed in the cyst. Nine years after the operation, there were no clinical or radiological signs of recurrence, though a small radiolucent area remained in the left mandibular region. Permanent dentition developed normally without abnormalities such as hypoplasia,delayed eruption, or malposition of the left premolar.Our experience indicates that early detection and treatment of a simple bone cyst in younger children can prevent developmental abnormalities of permanent teeth and lead to normal permanent dentition.View full abstractDownload PDF (1027K) -
Hiromi HATANO, Maho MIYAKE, Yuuki MATSUZAKI, Hiroko HOSHIYAMA, Eiwa OG ...2013 Volume 51 Issue 1 Pages 36-42
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSEpulis development related to congenital teeth is very rare, with few cases reported. We present 3 cases of epulis related to congenital teeth. In one, the epulis was presented at birth, then recurrence after tooth extraction and epulis resection was noted. The other two cases demonstrated an epulis in the lower primary incisor region following congenital tooth extraction.All congenital teeth in the present cases were extracted because of severe mobility and bleeding,and the gingival tumors developed after those extractions. The tumor mass in each patient appeared to have a hard component in X-ray images and was completely removed, including hard tissue. In histopathological findings, bone tissue formation was observed in the epulis, thus each case was diagnosed as epulis osteoplastica. This finding suggested survival of the organization of the dental papilla of the extracted congenital tooth, in which bone formation occurred due to inflammatory reactions by collagen fibers. Good results were obtained in each case when the epulis was excised along with hard tissue.Based on our experience, it is important to excise an epulis associated with congenital teeth, including any residual congenital tooth tissue. Furthermore, if congenital tooth exfoliation or extraction occurs, the potential formation of an epulis should be considered and careful observation is required.View full abstractDownload PDF (941K)
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2013 Volume 51 Issue 1 Pages 43-137
Published: March 25, 2013
Released on J-STAGE: March 19, 2015
JOURNAL FREE ACCESSDownload PDF (2188K)
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