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At least 325 records · Page 18Linked to original sources
PubMed1998

Loss of space and dental arch length after the loss of the lower first primary molar: a longitudinal study.

The premature loss of primary teeth may harm the normal occlusal development, although there are debates relating to the necessity of using space maintainer appliances. The aim of the study is to evaluate the changes in the dental arch perimeter and the space reduction after the premature loss of the lower first primary molar in the mixed dentition stage. The sample consists of 4 lower arch plaster models of 31 patients, within the period of pre-extraction, 6, 12 and 18 months after the lower first primary molar extraction. A reduction of space was of noted with the cuspid dislocation and the permanent incisors moving toward the space of the extraction site. It was concluded that the lower first molar primary premature loss, during the mixed dentition, implicates an immediate placement of a space maintainer.

Child↗
PubMed1997

Regressive changes of the dental pulp complex in retained primary molars with congenitally missing successor teeth.

This study was undertaken to investigate the regressive changes occurring in the dental pulp complex (pulp, dentin, and cementum) of retained mandibular primary second molars with congenitally missing bicuspid teeth. Seventeen retained, caries free, primary molars were used. The specimens were fixed in 10% neutral buffered formalin. Fixed samples were decalcified, routinely prepared, embedded in paraffin, sectioned, and stained with hematoxylin and eosin. The results demonstrated a reduction in the pulp size, abnormal odontoblastic pattern, declined vascularity, pulp degeneration, pulp stones, accelerated formation of secondary dentin, and hypercementosis. This study suggests that these findings may be from aging and physiological defensive changes. These normal, age-induced changes are of considerable importance in the fields of endodontics, orthodontics, and pediatric dentistry.

Adult↗
PubMed1998

A longitudinal study of the development of crowded dental arch.

It is important to determine both where and when in the process of dental arch development crowding occurs. The authors investigated 81 children (boys/37, girls/44). These children were developing permanent dentition without early loss of deciduous or permanent teeth, which is considered to be one of the causes of malocclusion. Impressions were taken from subjects who had normal, spaced, or crowded permanent dental arch, and longitudinal casts made every two months from three years of age. In both the maxilla and the mandible, the transition to the crowded condition most often occurred (maxillary: 84.6%, mandibular: 64.5%) at the time of eruption. Crowding condition was also caused by the eruption of other teeth; however, this was rare. The maxillary and mandibular crowding mostly occurred (maxillary: 69.2%, mandibular: 77.4%) in the anterior teeth. It was seldom observed in the premolar and first molar regions.

Child↗
PubMed1998

Folklore in children's odontology.

Popular customs with regard to tooth replacement are closely linked to magical ideas. The most important ones--such as throwing the tooth on the roof, giving it to mice or hiding it in different places--occur in places which are very far distant from one another, indicating that these customs originate from ancestral cultures.

Animals↗
PubMed1998

MGDS case presentation: hypodontia with retained deciduous teeth.

This case, which was presented as a log diary for the 1997 Diploma of Membership in General Dental Surgery (MGDS) examination, describes the examination, treatment planning, and subsequent treatment of a patient displaying mild hypodontia with retained deciduous teeth and lateral excursions guided by group function. It incorporates preventive treatment and management of early interproximal caries, prerestorative orthodontics, reorganisation to a canine-guided occlusion using conventional and adhesive cast restorations, and management of an occasional clenching habit.

Adult↗
PubMed1998

The effects of different conventions regarding missing primary incisors in epidemiological studies.

OBJECTIVE: To assess the effects of two different conventions regarding the scoring of missing primary incisors in epidemiological studies. DESIGN: During 1995/96 a sample of 5-year-old children was examined as part of the national programme of surveys coordinated by the British Association for the Study of Community Dentistry. The fate of missing incisors was recorded according to two conventions and the resulting mean dmfts and components compared. SUBJECTS: Eight hundred and twenty-six randomly sampled 5-year-old children were examined by two trained and calibrated examiners under standardised conditions in their primary schools in North, Central and South Manchester. RESULTS: The overall mean dmft was 3.40 under the new convention and 3.60 with the old, a difference of 5.6%. The mean mt was depressed by 23% from 0.86 to 0.66 under the new convention. The differential between old and new conventions increased with dmft. The district with the highest mean dmft was affected most by the application of the new convention; the mean dmft was depressed by 8.5% from 4.33 to 3.96 and the mean mt was depressed by 32% from 1.17 to 0.80. All differences were significant (P < 0.01). CONCLUSION: A change in convention affected the results to varying degrees depending on the disease level of the population group being surveyed.

Child, Preschool↗
PubMed1992

Marginal bone level in the normal primary dentition.

The aim of the present study was to establish the normal range for the radiographic distance between the cemento-enamel junction (CEJ) and the marginal bone level (MBL) in the primary dentition, and to relate this distance to various physiological and pathological factors. 128 children at the ages 7, 8 and 9 years took part in the study. Clinical and radiographic examinations of the mesial and distal surfaces of all primary molars and the distal surface of the primary canines were performed. The clinical examination included measurements of the amounts of plaque, bleeding on probing, probing depth and probing attachment loss. In addition, increased mobility of the primary teeth and stage of eruption of the neighbouring permanent teeth were recorded. The radiographic examination included measurements of the CEJ-MBL distance and the remaining root length. Also, exfoliating teeth, presence of proximal dentin caries, restorations and calculus were recorded from the radiographs. Associations between various explanatory variables and the CEJ-MBL distance were tested with both a chi 2 test and a variance components analysis. The mean CEJ-MBL distance for all primary tooth surfaces was 1.0 mm. Individual surfaces displayed distances ranging from 0.0-4.0 mm. Of the variables tested for association with the CEJ-MBL distance, eruption of neighbouring permanent tooth and exfoliation of neighbouring primary tooth seemed to be associated with large CEJ-MBL distances. When surfaces with these characteristics were excluded, a CEJ-MBL range of 0.0-2.0 mm was obtained.(ABSTRACT TRUNCATED AT 250 WORDS)

Alveolar Process↗
PubMed1977

Development and size of the teeth of Macaca mulatta.

A cross-sectional sample of 151 skulls from Macaca mulatta of known age and similar rearing in U.S. Primate Centers was analyzed to determine age-related "norms" of stages of development and size of teeth. The stages of development from the follicle of a deciduous incisor in the fetus to completion of the root with apex closed of the permanent third molar were related to age. The age range observed for eruption of each tooth was noted and related to its stage of development. The crown of each erupted tooth was found to be completely developed, but growth of its root continued for a longer, indeterminate period. When a deciduous tooth was exfoliated, the crown of the permanent successor was found to be completed and root growth had begun. Measurements of both mesiodistal and faciolingual diameters and of crown length of the teeth in situ and of total length and root length on roentgenograms were examined for sexual dimorphism. The faciolingual diameter of the deciduous mandibular second incisor and of both second molars showed the greatest sexual dimorphism among both diameters of all deciduous teeth. The mesiodistal and faciolingual diameters of the mandibular premolars were found to be the best dimensions in discriminant functions for identifying sex in the absence of permanent canines.

Age Factors↗
PubMed2004

The prevalence and severity of oral impacts on daily performances in Thai primary school children.

BACKGROUND: Traditional methods of measuring oral health mainly use clinical dental indices and have been complemented by oral health related quality of life (OHRQoL) measures. Most OHRQoL studies have been on adults and elderly populations. There are no systematic OHRQoL studies of a population-based sample of children. The objective of this study was to assess the prevalence, characteristics and severity of oral impacts in primary school children. METHODS: Cross-sectional study of all 1126 children aged 11-12 years in a municipal area of Suphanburi province, Thailand. An OHRQoL measure, Child-Oral Impacts on Daily Performances index (Child-OIDP) was used to assess oral impacts. Children were also clinically examined and completed a self-administered questionnaire about demographic information and oral behaviours. RESULTS: 89.8% of children had one or more oral impacts. The median impact score was 7.6 and mean score was 8.8. Nearly half (47.0%) of the children with impacts had impacts at very little or little levels of intensity. Most (84.8%) of those with impacts had 1-4 daily performances affected (out of 8 performances). Eating was the most common performance affected (72.9%). The severity of impacts was high for eating and smiling and low for study and social contact performances. The main clinical causes of impacts were sensitive tooth (27.9%), oral ulcers (25.8%), toothache (25.1%) and an exfoliating primary tooth (23.4%). CONCLUSIONS: The study reveals that oral health impacts on quality of life in Thai primary school children. Oral impacts were prevalent, but not severe. The impacts mainly related to difficulty eating and smiling. Toothache, oral ulcers and natural processes contributed largely to the incidence of oral impacts.

Child↗
PubMedDate not supplied

Electrosurgical pulpotomy: a retrospective human study.

While the formocresol pulpotomy has enjoyed long-term clinical use and success, concerns over its toxicity and mutagenicity have prompted research into other pulpotomy techniques. The purpose of this study was to observe retrospectively the results of the electrosurgical pulpotomy technique used on primary molar teeth requiring pulp therapy, secondary to carious involvement. The mean age at the time of treatment was 5 years, 11 months and the mean postoperative observation time was 2 years, 3 months. Of the 164 teeth studied, 127 were normal at the last observation visit; 32 had undergone exfoliation; 4 had an abnormality associated with the pulpotomized tooth, but were not considered failures; and 1 was considered a failure. This is a 99.4 percent success rate. Compared to a formocresol pulpotomy study of similar design, the success rate for the electrosurgical pulpotomy procedure in this study is higher at the statistically significant level of p < 0.01.

Child↗
PubMed2000

Persistence of deciduous molars in subjects with agenesis of the second premolars.

The purpose of the present study was to investigate persistent primary second molars in a group of young people in their late twenties with agenesis of one or two second premolars. In 1982-83 it was decided, in connection with the orthodontic evaluation of 25 patients, to allow 35 primary molars (one or two in each patient) to remain in situ. All patients had mixed dentitions and agenesis of one or two premolars. The primary teeth were generally in good condition, although root resorption and infra-occlusion (compensated by occlusal composite onlays) occurred. In 1997, 18 of the 25 patients with a total of 26 retained primary molars were reexamined, comprising a clinical examination for exfoliation, extraction, loosening, and ankylosis, and a radiographic examination for root resorption, tooth morphology (crown and root), and alveolar bone contour. The examination showed that the degree of root resorption was unaltered in 20 of the 26 primary molars. In the permanent dentitions, where these primary molars persisted, there were no morphological deviations. Three of the six remaining primary molars had been extracted and three showed extensive resorption. In three of the 26 primary molars the infra-occlusion had worsened. The present study shows that persistence of primary second molars in subjects with agenesis of one or two premolars, and normal morphology of the permanent dentition can be an acceptable, semi-permanent solution for the patient. Whether this could also be an acceptable long-term solution will be shown by follow-up studies.

Adult↗
PubMed1997

Spontaneous exfoliation of teeth following severe elemental mercury poisoning: case report and histological investigation for mechanism.

BACKGROUND: Although the spontaneous exfoliation of teeth and breakdown of oral tissues from severe mercury intoxication have been noted for over a century, there are no published reports investigating the mechanisms of these phenomena. Severe mercury poisoning is rare in modern times, but it does occur. We present a case report and a histopathologic investigation into the mechanism of the associated tooth loss. METHODS: An exfoliated tooth and periodontal and gingival tissues were obtained from a 15-month-old patient who had been severely intoxicated with elemental mercury over a period of months and hospitalized for severe neurologic and renal effects. The tissues were examined both by routine hematoxylin and eosin stain and by autometallography specific for mercury. For comparison, control tissue from an age-matched subject was examined with the autometallography technique. RESULTS: Under light microscopy, the gingival tissue showed evidence of moderate to severe acute and chronic inflammation. The tooth pulp tissue showed evidence of moderate vascular dilatation and congestion, and it was infiltrated by many neutrophils. The autometallographic sections showed intense accumulations of mercury in the soft tissues of the mercury-exposed subject, but not in the tissues of the control subject. The deposits were primarily found in fibroblasts, which are essential to maintaining the integrity of the oral tissues. CONCLUSIONS: Histopathologic and autometallographic examination of the affected tissue indicates that the primary mechanism of the spontaneous sloughing of tissue and loss of teeth may be the cytotoxic effects of the accumulation of mercury in fibroblasts. Studies of additional cases would be valuable to confirm this hypothesis.

Case-Control Studies↗
PubMed2002

The fate of 1,587 unrestored carious deciduous teeth: a retrospective general dental practice based study from northern England.

OBJECTIVE: To investigate the outcome of non-restoration of carious deciduous teeth by means of a retrospective analysis of clinical case notes of children regularly attending two general dental practices and receiving preventive care. DESIGN: Using a carefully defined protocol the fate of deciduous teeth diagnosed as carious into dentine but symptomless and left unrestored was determined from the sequential examination of the clinical records of 481 children attending at least annually. RESULTS: The age at initial diagnosis of carious teeth ranged from 1-12 years with the majority of cavities (1,005) presenting by 6 years of age. In all, 1,587 teeth were followed until loss from the mouth. Of these, 190 (12%) were extracted because of pain and a further 60 (4%) became painful and were treated, leaving 1,337 (84%) that remained symptomless until being lost. Of the 1,337 symptomless teeth, 178 were extracted under general anaesthesia at the same time as painful ones. The final group of 1,159 (74%) teeth were exfoliated without causing pain after a mean survival time of 1,332 days. Excluding from the analysis the 178 extracted, but symptomless teeth, leaves a total of 1,409 teeth of which 18% gave pain and were extracted or treated and the remaining 82% exfoliated. The strongest determinant of pain was age on diagnosis, the other factors being tooth type and extent of the cavity when first seen. The carious teeth most likely to cause symptoms were found to be molars that developed cavities with pulpal involvement by the age of 3 years, 34% of which caused pain. In contrast, those least likely to cause pain were carious molar teeth presenting without pulpal involvement after 8 years, only 6% of which produced symptoms. CONCLUSION: In these patients, the majority of unrestored carious deciduous teeth remain symptomless until shed. The results provide evidence to aid the treatment planning of carious deciduous teeth in children regularly receiving regular preventive dental care.

Age Distribution↗
PubMed2001

Caries and salivary status in young adults with type 1 diabetes.

The aim of this study was to evaluate the salivary status, prevalence of caries and the status of primary dentition, when primary teeth were exfoliated, in 41 patients, 18-24 years of age, with type 1 diabetes since childhood in comparison with age- and sex-matched non-diabetic controls. The blood glucose and glycosylated haemoglobin concentration (HbA1c), dosage of daily insulin and retinal fundus photography was recorded for the diabetic group. According to the concentration of HbA1c, the diabetic patients were divided into well and poorly controlled groups. The study was based on three intra-oral photos, dental examination including intra-oral radiographs, flow rate and buffering capacity of the saliva and amount of Streptococcus mutans and Lactobacilli. Retrospective data regarding the primary dentition was found in the dental files of each patient, and are based on the last registration for respective tooth before exfoliation. The patients with type 1 diabetes, without any relationship to metabolic control, displayed more initial buccal caries compared to healthy controls (p<0.01). No significant differences concerning the status of saliva (neither flow rate, buffering capacity nor amount of Streptococcus mutans and Lactobacilli), manifest caries or the status of the primary dentition were seen. We conclude that initial, but not manifest caries seems to be overrepresented in young adults with type 1 diabetes. These patients, thus, need more intense efforts regarding dental health care to prevent the development from initial to manifest caries.

Adolescent↗