Deciduous Central Incisors Research Articles

Fibrodysplasia ossificans progressiva 환자의 증례보고 및 치과 치료시 고려 사항

Fibrodysplasia ossificans progressiva(FOP) is characterized by episodes of permanent heterotopic ossifications of soft tissues throughout the body. FOP is inherited in an autosomal dominant pattern, but most cases result from new mutations in the ACVR1 gene. Even minimal trauma can cause permanent ossifications of soft tissues and give rise to complications following routine dental care. Dental block anesthesia, severe stretching of the jaw and biopsies are all contraindicated in children with FOP. There is no effective treatment. Since the prevalence of FOP is very low and most patients with FOP are misdiagnosed during childhood, they undergo dangerous and unnecessary treatment that can lead to permanent harm. For patients with FOP, early diagnosis and prevention of complications are most important. This study aims at contemplating the characteristic features and consideration factors for the dental treatment of FOP patients in relation to the case of an eight years-and-one month old boy who was referred to Pediatric Dentistry due to prolonged retention of mandibular right and left deciduous central incisors after being diagnosed with sporadic FOP at Pediatric Orthopaedics, Seoul National University Hospital, and received dental treatment without the exacerbation of the FOP symptoms.

Gemination, fusion and confusion – unravelling a developmental dental anomaly

Specimens of a tooth and soft tissue were submitted from a 4-year-old boy with a large radiolucency in the left anterior maxilla associated with apex of malformed deciduous left central incisor and the crown of the unerupted permanent maxillary left central incisor tooth. Macroscopically the tooth submitted had a broad crown composed of three fused crowns and a single root mass with three distinct longitudinally-orientated components. The soft tissue was consistent with an inflamed dentigerous cyst associated with the permanent central incisor. Decalcified sections of the hard tissue showed a small amount of enamel matrix remaining after decalcification. The dentine was normal and contiguous across the width of the tooth with a single (widened) pulp space containing vital pulp. Correlation with the radiographs demonstrated that the teeth submitted were of the deciduous series. Taking into account the number of identifiable deciduous teeth present, the specimen submitted must have represented fusion of the deciduous maxillary left central and lateral incisor tooth germs with an attempt at separation (gemination or twinning) of one of these tooth germs to form two separate teeth. Anomalies of the permanent teeth were also identified radiographically. The crowns of the maxillary left permanent central and lateral incisor teeth were aligned horizontally. There also appeared to be gemination of the unerupted mandibular left permanent lateral incisor tooth to give a crown wider than the contralateral tooth. This case appears to represent a rare (and possibly unique) example of fusion and gemination of the same tooth as well as other developmental dental anomalies elsewhere in the jaws.

Foreign body in a deciduous incisor: A radiological revelation

A 6-year-old boy was brought to the dental department with a history of toothache in the anterior maxillary region. Intraoral examination revealed caries in the deciduous upper central and lateral incisor teeth. Radiological evaluation revealed the silhouette of a metallic paper clip in the pulp chamber of the deciduous right maxillary central incisor. The tooth was extracted as the permanent incisor was erupting below. Children often avoid informing their parents regarding such incidents due to fear of punishment.

Labial talon cusps: a South American archaeological case in the deciduous dentition and review of a rare trait

Talon cusps are rarely reported developmental anomalies of the anterior dentition. They occur most commonly on the lingual aspect of the tooth but may also affect the labial aspect, and double (lingual and labial) talon cusps have also been reported. This study presents the first case of a labial talon cusp affecting the maxillary deciduous central incisor to be described in the literature. It was identified in a child skeleton from the archaeological site of Borgatta, north-west Argentina. The aetiology of talon cusps remains uncertain, with a combination of both genetic and environmental factors hypothesised to be involved. As a number of cases of labial talon cusps have now been published, this study presents a survey of cases in the literature to characterise the expression of this trait, and compares it with that of lingual talon cusps. The aim is to offer further insight into the relationship between lingual and labial talon cusps and their aetiologies. Differences between these traits in sex distribution, frequency of maxillary and mandibular cases, and the most commonly affected teeth are demonstrated.

Aesthetic restoration of deciduous anterior teeth after removal of carious tissue with Papacárie ®

The development of conservative techniques for the removal of carious tissue and the improvement of dental restoration materials allow better preservation of the dental structure. Chemomechanical caries removal is a conservative and atraumatic alternative. Papacárie is a papain-based material developed to act only on the carious dentin, allowing its easy removal with a blunt curette. This study aims to present a clinical case of aesthetic restoration of both upper deciduous central incisors after the removal of carious tissue with Papacárie.

Supernumerary teeth at primary and permanent dentition

Development disturbance originate in the odonthogenesis and begin around the 40 TH week. It might occur on both dentitions, being scarcer in the primary one. Several hypotheses are mentioned for etiology of the supernumerary teeth and, among them, that one about hyperactivity of the Dental Blade, what would cause increment in the quantity of dental elements. There are correlations among the alteration in the quantity of teeth and systemic diseases, several syndromes as: Cleidocranian Displasia, Gardner Syndrome and Labial and Palatal Fissures. The clinical case of a male patient, 8 years old, leukoderm, which upper deciduous central incisors never exfoliated. The clinical examination demonstrated the presence of two erupted deciduous supernumerary elements between the elements 52 and 53. The radiographic tests (orthopantomography and per apical R-X of the incisors region) indicated the presence of further two impacted permanent supernumerary elements in the pre-maxilla region. The treatment plan selected was therapy for space maintenance in the arch with surgical removal of the supernumerary elements and orthodontic motion. Multidisciplinary approach provided adequate diagnosis and treatment to the patient.

Structure and microstructure of coronary dentin in non-erupted human deciduous incisor teeth.

The dentin structure of non-erupted human deciduous mandibular and maxillary central and lateral incisor teeth was studied employing light and scanning electron microscopy. For light microscopy, nitric-acid-demineralized and ground sections were used. The sections were stained by hematoxylin-eosin, picrosirius and azo-carmine methods, and ground specimens were prepared using a carborundum disk mounted in a handpiece. For SEM study, teeth were frozen in liquid nitrogen and fractured at longitudinal and transversal directions. Structurally, demineralization and ground methods revealed tubules with primary and secondary curvatures, canaliculi, giant tubules, interglobular dentin, predentin, and intertubular dentin. Scanning electron microscopy showed three-dimensional aspects of dentinal tubules, canaliculi, peritubular dentin, intertubular dentin, and predentin. This study contributes to knowledge about dentin morphology showing characteristics of teeth not yet submitted to mastication stress.

Long-term Care of Cases with Fusion of the Maxillary Deciduous Central and Lateral Incisors Bilaterally: Report of 2 cases

Long-term Care of Cases with Fusion of the Maxillary Deciduous Central and Lateral Incisors Bilaterally: Report of 2 cases

Riga‐Fedes syndrome: Natal or neonatal teeth associated with tongue ulceration. Case report

A case of natal teeth associated with traumatic ulceration to the ventral surface of the tongue (Riga-Fedes syndrome) in a four week old boy is presented. On radiographic examination, two teeth, present at birth, were found to be early erupted deciduous lower central incisors. A family history of natal teeth, all involving both lower deciduous central incisors associated with trauma to the tongue during suckling, was elicited. The ulceration healed over a period of four weeks using an innovative conservative treatment regime, involving the use of Stomahesive Wafer. Four months later the only sign of any previous pathosis was a fibrous scar on the ventral surface of the tongue.

A Study on Root Canals of the Mandibular Deciduous Central Incisor by Means of Transverse Serial Section

A Study on Root Canals of the Mandibular Deciduous Central Incisor by Means of Transverse Serial Section

Tooth Lead Levels and IQ in School-Age Children: The Port Pine Cohort Study

The relation between lead concentration in deciduous central upper incisor teeth and intellectual functioning was examined in 262 children who were followed from birth to age 7 years in the lead smelter town of Port Pirie, South Australia, and its environs. Intellectual functioning of the children was assessed over the 3-year period from 1986 to 1989 with the revised Wechsler Intelligence Scale for Children (WISC-R) while each child was in his or her eighth year. There was an inverse relation between tooth lead concentration and intellectual development; the intelligence quotient declined by 2.6 points (90% confidence interval (CI) 0.13-4.9) for each natural-log unit increase in tooth lead concentration, expressed in parts per million. Some WISC-R subscales were more strongly associated with lead exposure than others. In particular, tooth lead was significantly negatively associated with scores for the "Block Design" test (partial regression coefficient -1.25 points per unit of natural-log tooth lead; 90% CI -0.61 to -1.89). No statistically significant interaction between a child's sex and tooth lead concentration was found for any of the WISC-R scales. These findings are in agreement with previously published results from this cohort for which serial blood lead concentrations were used to estimate lifetime lead burden.

１〜３歳児における歯間空隙量の変化と歯垢およびう蝕との関連に関する研究

The purpose of this investigation was to study the relation between changes in amount of interdental space accompanying growth and development of deciduous dentition, plaque deposits and interproximal caries in deciduous maxillary anterior teeth, and to determine whether the presence or absence of interdental space is useful for dental health guidance. Oral examinations were carried out on the same 2074 children at the age of 1 year and 6 months and 3 years and 6 months in Nagasaki City in Japan. Interdental spaces were examined by inserting an explorer. About two thirds of the subjects showed no individual changes in the interdental spaces between the right and left central incisors in the upper jaw. In most of the remaining subjects, spacing occurred gradually.Between the right and left maxillary deciduous central incisors, the proximal caries incidence in individuals with no space at the age of 1 year and 6 months was greater than that of those with space at the age of 1 year and 6 months. When there was no space at the age of 1 year and 6 months, the proximal caries incidence was related to plaque score. Between maxillary deciduous central incisors and lateral incisors, the proximal caries incidence was lower than between the maxillary deciduous central incisors and the proximal caries incidence was not affected by changes in amount of interdental space and plaque score. Between maxillary deciduous lateral incisors and canines, the proximal caries incidence was the lowest of the observed sites. It is important to take into consideration with deciduous dentition for caries prevention the space between the right and left maxillary deciduous central incisors.

１歳１か月の女児に発症した孤立性神経線維腫の１例

Neurofibroma which is often multiple is one of the symptoms of von Recklinghausen's disease. Solitary development of neurofibroma in the oral cavity is rare. We encountered a patient with a solitary neurofibroma that occurred on the gingiva. The patient was a girl aged one year and one month. She was introduced to our department due to swelling of the upper median gingiva. A swelling was detected in the cervical gingiva labially to the left upper deciduous central incisor. It was smooth on the surface, semi-spherical and elastic, and measured 5 mm in diameter. The swelling was clinically diagnosed as an epulis and was surgically excised under general anesthesia two months later. The resected lesion was spherical and not clearly encapsulated. Hyperplasia of small, thin collagen fibers mixed with fibroblasts was histologically found. The lesion seemed to be neurogenic. It reacted positively to immunohistochemical staining with S-100 protein.

北九州市 3 歳保育園児の口腔診査と日常生活

Three-year-old children in nursery schools in Kitakyushu City were examined for oral health and everyday life as a part of the health check program conducted form May 8 to July 4, 1989. The results were as follows : 1. The subjects consisted of 102 boys and 84 girls, a total of 186 children, form 3-year-old children in nursery schools in Kitakyushu City. 2. The cases of GI (gingivitis) were 20. Occurrence was more frequent in the maxilla than in the mandible. 3. The percentages of PLI (dental plaque) were a litlle over 60% for the maxilla and 40-50% for the mandible. By site, 〓 in the maxilla and 〓 in the mandible showed higher percentages. 4. CI (dental calculus) was the highest for the lower deciduous central incisor. 5. Adhesion of foreign bodies to tooth and completed fillings were found more for the maxilla and rare for the mandible. 6. Of the caries holders, 〓 was 18-20% and the mandible 2%. 7. The hour of rising was 7 : 00-8 : 00 on weekdays and 8 : 00-9 : 00 on Sundays and holidays. 8. Bedtime was 21 : 00-23 : 00 on both weekdays and Sundays and holidays. 9. Nap was taken by 80% of the subjects and face washing was done by close to 90%, with no sex difference. 10. Tooth brushing was done once a day after supper by the vertical and horizontal brushing, with no sex difference. 11. Most of the subjects took meals. A few did not have lunch and nearly all had supper. 12. Sweets were given twice a day always at a fixed place and in a fixed quantity for 70% of the subjects. 13. Chewing gum of Class I, chocolate, caramel, and ice cream accounted for 60% of sweets given. 14. About 30% received dental treatment within the one year.

A Case of Horizontal Impaction of Mandibular Left and Right Deciduous Central Incisors

A Case of Horizontal Impaction of Mandibular Left and Right Deciduous Central Incisors

A histological study of the chronology of initial mineralization in the human deciduous dentition

Accurate dating of initial mineralization in the dentition was derived from fetuses aged according to the maternal history, assessment of gestational age by obstetricians, paediatricians and pathologists, histological evaluation of their cerebellar and renal development, and accurate measurements of crown-rump length, skull circumference, brain and body weight. Serial sections of the jaws of 121 fetuses ranging from 10 to 26 weeks post-menstrual age first showed mineralized dentine in the deciduous central incisor at 15–19 weeks, in the lateral incisor at 16–21 weeks, in the canine at 19–22 weeks, in the deciduous first molar at 16–19 weeks and in the second molar at 20–22 weeks. These age ranges differ from those for initial mineralization common in textbooks, particularly for the molars.

A Case of Inverted Impaction of Maxillary Left Deciduous Central Incisor

A Case of Inverted Impaction of Maxillary Left Deciduous Central Incisor

Pulpectomy treatment for fused deciduous teeth: a case report

A case of a four and a half-year-old with a fused maxillary deciduous central and lateral incisor treated with a ZOE pulpectomy is reported. A case of a four and a half-year-old with a fused maxillary deciduous central and lateral incisor treated with a ZOE pulpectomy is reported.

Apexification of deciduous incisor

A calcium hydroxide apexification procedure for a pulpless deciduous central incisor is described. A calcium hydroxide apexification procedure for a pulpless deciduous central incisor is described.

Labial Pulpectomy Access followed by Esthetic Composite Resin Restoration for Nonvital Maxillary Deciduous Incisors

A 3-year-old girl had a darkened and symptomatic maxillary right deciduous central incisor. This report describes the rationale and technique for a labial pulpectomy access opening and subsequent composite resin restoration. This innovative approach for the pulpal treatment of these deciduous incosors not only improves the access for instruments and direct visualization for the operator but also greatly improves the appearance of the dark teeth without complete coverage. Two other clinical applications of this labial approach should also be mentioned. First, anterior stainless steel crowns can be made esthetically pleasing by placing labial resin facings in the crown. Second, access for pulpotomy procedures can be improved with use of a labioincisal approach after the incisal reduction step in the preparation of deciduous incisors for complete coverage.