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At least 883 records · Page 49Linked to original sources
PubMed2000

Survey of dental treatments for pediatric patients referred to the pediatric dental clinic of a dental school hospital.

This survey was conducted to clarify which dental treatments in children are regarded as difficult by general dentistry practitioners. The subjects were 615 children who first visited Tokyo Dental College Chiba Hospital from January 1995 to August 1999 with reference letters. There were 615 children in the study; 571 (92.8%) came from Chiba City where our hospital is located and the 11 regions surrounding Chiba City. The prime reasons for referral in the order of frequency were treatments of dental caries, malalignment/malocclusion, traumatized teeth, supernumerary teeth, retarded eruption/impacted teeth, abnormal direction of erupted teeth, congenitally missing teeth, prolonged retention of deciduous teeth, and abnormal frenulum. Patients with dental caries or traumatized teeth in the deciduous dentition period and those with malalignment/malocclusion, supernumerary teeth, or retarded eruption/impacted teeth in the mixed dentition period were often referred to medical organizations specializing in pediatric dentistry because of the difficulties in controlling the patients' behavior and in providing adequate treatment. The information about pediatric dental treatments considered difficult by general dentists revealed by this survey appears to be useful and needs to be incorporated in the programs for clinical training of undergraduate students and education of postgraduate students.

Adolescent↗
PubMed2001

Histological and analytical studies of a tooth in a patient with cleidocranial dysostosis.

A histopathological and analytical study of a permanent tooth from a patient with cleidocranial dysostosis (CCD) was performed. The patient was a 47-year-old woman, who had 10 erupted permanent teeth and 2 partially erupted and 19 completely impacted teeth, including supernumerary teeth. The erupted right upper premolar was extracted and observed using a light microscope and an electron probe X-ray microanalyzer (EPMA). Findings showed enamel hypoplasia, predominantly irregular globular dentin and Tomes' granular layer, and a complete lack of cellular cementum in the ground section. The incremental von Ebner and counter Owen lines were obscure. Comparative quantitative analysis using the EPMA showed that the quantities of calcium and phosphate were lower in the enamel and dentin than those of the control sample.

Bicuspid↗
PubMed1994

The effects of cervical headgear on dentofacial structures.

A study was made on the effects of cervical headgear on dentofacial structures, especially non-erupted teeth, in the early and late mixed dentition periods. Pretreatment and post-treatment cephalometric evaluation was done on 8 patients in the early mixed dentition period and 10 patients in the late mixed dentition period. The results showed that any reference line passing through Ptm point should not be used to evaluate the efficiency of cervical headgear, and that such headgear is more effective on non-erupted teeth in early mixed dentition.

Bicuspid↗
PubMed1975

Histochemical studies on beta-glucuronidase activity in developing teeth and bone of rat and Macaque monkey.

The enzyme beta-glucuronidase (E.C. 3.2.1.31.) has been studied in developing teeth and bone of Sprague-Dawley rats and Macaque monkeys (Macaca Irus) by means of histochemistry using naphthol-AS-BI-beta-D-glucuronide as substrate and hexazotized pararosanilin as coupling reagent. Since beta-glucuronidase is sensitive to fixatives a freeze-sectioning technique has been used which made it possible to section highly mineralized tissues without previous fixation and decalcification. In the bone enzyme activity was found in osteoclasts and osteoblasts. beta-glucuronidase activity was found in teeth of both species in odontoblasts, ameloblasts, stratum intermedium, inner and outer enamel epithelium. When enamel matrix formation was completed as indicated by the reduction of ameloblast length the enzyme activity of the ameloblasts increased.

Ameloblasts↗
PubMed1993

Symptoms and lesions associated with retained or partially erupted third molars. Some variables of third-molar surgery in Norwegian general practice.

A questionnaire on third-molar problems was mailed to a systematic random sample of 200 Norwegian general dental practitioners in November 1991. A 88% return rate was obtained. The following conclusions were drawn: on an average, 3.8 patients with lesions or complaints from retained or partially erupted third molars were seen in general practice in 1 month, and most of these consultations were associated with partially erupted third molars. A mean of 1.3 surgical removals of third molars was performed in general practice in 1 month. The mean one-way travel time for patients to specialists in oral surgery was 1.3 h, and variations were not related to surgical activity in practice. Fourteen per cent of the general practitioners refer surgical cases to non-specialists.

Adult↗
PubMed1993

General practitioners' and dental students' decisions on third-molar diagnoses, treatment, and referrals.

A questionnaire on third-molar problems was mailed to a systematic random sample of 200 Norwegian general dental practitioners in November 1991. The return rate was 88%. Similar questions were given to 59 5th-year dental students, with a return rate of 83%. Ten third-molar cases were presented by means of copies of radiographs and written information. The following conclusions were drawn: Apart from a terminology problem consisting of lack of discrimination between the terms retention and impaction, overall good diagnostic abilities were shown by both practitioners and students. Receiver operating characteristic analysis of treatment decisions indicated that students were more radical than practitioners. The students had an increased referral rate for third-molar surgery, whereas the practitioners indicated a more selective practice of referring advanced cases.

Adult↗
PubMed1997

Mandibular third molars as mediated by three cues. Dentists' treatment decisions on asymptomatic molars compared with molars associated with pathologic conditions.

The aim was to study how three cues (patient's age and angular position and degree of impaction of the molar) were distributed among removed mandibular third molars associated with pathologic conditions and to compare these results with dentists' treatment decisions in another group of molars consisting of asymptomatic mandibular third molars, as mediated by the same cues. The overall agreement was fairly high between the dentists' treatment decisions and the removal rate among the molars subjected to removal. Thus, molars partially covered by soft tissue in patients aged 19 to 40 years had a high removal rate, and molars totally covered by bone tissue had the lowest removal rate in accordance with the dentists' treatment decisions. There were some exceptions. For example, molars partially covered by soft tissue in horizontal and mesioangular positions were rated higher by the dentists than the removal rates indicated. Distoangular molars in patients aged 26 to 40 years had the highest removal rate but a considerably lower order according to the dentists' decisions. Scientific evidence indicates that molars in mesioangular and horizontal positions present a low risk and molars in distoangular position present the highest risk of developing pathologic conditions, compared with other angular positions.

Adult↗
PubMed1995

Ultrastructural study of tooth enamel with amelogenesis imperfecta in AI-nephrocalcinosis syndrome.

This paper describes the ultrastructure of the affected enamel and the clinical features in two siblings with the syndrome of nephrocalcinosis and amelogenesis imperfecta. Nephrocalcinosis was diagnosed by intravenous pyelography, and confirmed by ultrasonography and CT scan. Amelogenesis imperfecta AI was diagnosed clinically and histologically. Light microscopy showed that the affected enamel surfaces were rough and the enamel was hypoplastic and mainly positively birefringent. Scanning electron microscopy revealed a rough and extensively cracked enamel surface covered with oval shaped blister-like protrusions. TEM showed porous enamel consisting of loosely packed and randomly oriented thin ribbon-like crystals with little or no prismatic structure. Observations showed that hypoplasia together with hypocalcification and/or hypomaturation defects were present in the same tooth, indicating the possibility of an abnormality in interstitial matrix, leading to dystrophic calcification in the kidney and abnormal tooth enamel formation, or alternatively an involvement of two separate but closely linked genes.

Adolescent↗
PubMed2005

Non-syndrome multiple supplemental supernumerary teeth.

Multiple supernumerary teeth without any associated systemic conditions or syndromes are not common. We document a case of non-syndrome multiple supplemental supernumerary teeth in mandibular premolar region of an adolescent male patient, an incidental findings during routine radiographic examination. Periodic examination is recommended to monitor the clinical behavior.

Adolescent↗
PubMedDate not supplied

Nevoid basal cell carcinoma syndrome.

Binkley and Johnson first reported this syndrome in 1951. But it was in 1960, Gorlin-Goltz established the association of basal cell epithelioma, jaw cyst and bifid ribs, a combination which is now frequently known as Gorlin-Goltz syndrome as well as Nevoid Basal Cell Carcinoma Syndrome (NBCCS). NBCCS is inherited as an autosomal dominant trait with high penetrance and variable expressivity. NBCCS is characterized by variety of cutaneous, dental, osseous, opthalmic, neurologic and sexual abnormalities. One such case of Gorlin-Goltz syndrome is reported here with good illustrations.

Adolescent↗
PubMedDate not supplied

Multiple dental developmental abnormalities following canine distemper infection.

Multiple dental developmental abnormalities (e.g., dental impaction, partial eruption, oligodontia, enamel hypoplasia, and dentin hypoplasia) in a 10-month-old, female, Tanzanian tropical mixed-breed puppy are reported. Various permanent teeth were involved. These included impacted mandibular canine and first and third premolar teeth; a partially erupted maxillary canine tooth; oligodontia of a mandibular fourth premolar tooth; enamel hypoplasia of the maxillary and mandibular canine teeth, incisors, and premolars; and dentin hypoplasia of the maxillary incisors, maxillary premolars, and mandibular premolars. The puppy had clinical canine distemper at the age of two months and had no history of any other systemic nor generalized infection prior to the time when the dental abnormalities were observed.

Animals↗
PubMedDate not supplied

Sequelae and prognosis of intruded primary incisors: a retrospective study.

PURPOSE: This study was designed to assess the sequelae and prognosis of intruded primary incisors. METHODS: Of 196 children who visited the emergency clinic due to intrusion of 310 maxillary primary incisors, 110 children (172 teeth) were available for follow-up examination (study group). Eighty-six children (138 teeth) did not show for the follow-up examination (non-respondents group). Male/female ratio was 1.7:1. Age range of children at time of injury was 12-72 months (mean 28). Follow-up time ranged between 0 and 59 months (mean 27). RESULTS: Fifty-seven percent of all teeth were completely intruded. In 80%, the root was pushed labially. All but two ankylosed teeth re-erupted, and 37% of these re-erupted into an ectopic position. Completely intruded incisors re-erupted into an ectopic position in a higher percentage (45%) than partially intruded teeth (30%). Fifty-two percent of the teeth presented pulp canal obliteration (PCO). Sixty-four percent of the completely intruded incisors presented PCO compared to 40% of partially intruded teeth. Arrest of dentin apposition was found in 15% of the teeth, and was not affected by the degree of intrusion. Twenty-three teeth were extracted shortly after the injury due to suspect of contact with the developing permanent successor (19 teeth) and severe caries (4 teeth). Sixty-eight percent of the intruded teeth survived more than 36 months after the injury. Twenty-three percent were extracted due to periodontal breakdown and 5% due to repeated trauma. Antibiotic therapy did not have any effect on the survival rate. CONCLUSION: The majority of intruded primary incisors may re-erupt and survive with no complications after more than 36 months post trauma even in cases of complete intrusion and fracture of the labial bone plate.

Age Distribution↗