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At least 217 records · Page 12Linked to original sources
PubMed1989

Effect of prenatal and postnatal fluoride on the human deciduous dentition. A literature review.

Fluoride passes from the mother to fetal teeth. Much of the fluoride is taken up in secretory enamel, probably by the forming mineral apatite crystals. Some is retained with residual proteins. The low concentration of fluoride in the inner enamel is incorporated mainly during the secretory stage, while the enhanced concentration in the surface enamel is produced during the much longer maturation stage. Mature, hard enamel is generally absent during fetal life. The clinical question is whether prenatal fluoride imparts an additional benefit to the universally accepted effect of postnatal fluoride. In general, surface enamel fluoride levels of deciduous teeth increase with increasing pre- and postnatal fluoride administration. A consistent level of caries protection has been reported with pre- and postnatal administration of fluoride unrelated to the acquisition of fluoride in the surface enamel. Many children develop enamel opacities in their deciduous dentition related by various factors to enamel mineralization disturbances in drinking water areas even low in fluoride. Accumulation of fluoride due to an increased fluoride intake is a feature of fluorosed enamel in the deciduous as well as permanent dentition. The resulting mature fluorosed enamel retains a relatively high proportion of immature matrix proteins onto the crystal surface. The degree of fluorosis of the deciduous dentition is less compared with that of the permanent dentition, due probably to a partial protection afforded by the maternal loss of fluoride, formerly known as the "placental barrier".

Dental Enamel↗
PubMed1986

Personality traits of adolescents with intact and restored dentitions.

The personality pattern of 29 subjects aged 15 years with intact dentitions was studied by means of a personality inventory (KSP) and compared with that of 41 subjects of the same age with repaired dentitions. The subjects with repaired dentitions showed significantly higher scores in the somatic anxiety and the muscular tension scales; that is, dental restorations were commoner in subjects with autonomic and motor disturbances related to anxiety-proneness. Furthermore, subjects in the control group with high clinical dysfunction index (CDI) had higher scores in the muscular tension, the inhibition of aggression, and the irritability scales. The finding of higher scores in the muscular tension scale was validated in the clinical examination. Possible explanations of the differences in the personality patterns between individuals with intact and repaired dentitions are discussed. Clenching and gnashing of the teeth was also studied in relation to the personality variables. Teeth clenchers in both groups were more anxiety-prone, less self-assertive, and less socialized.

Adolescent↗
PubMed2003

Dental treatment in the primary dentition of 7-12 year-old Swedish schoolchildren.

In most Swedish counties, epidemiological data on the permanent dentition are collected on all patients aged 7-19 years. For the primary dentition, epidemiological data are only reported for the 3-6-year-old age groups. The purpose of the present study was to investigate what treatments had been made in the primary dentition during the period when the children were 7 to 12 years old. The sample size constituted 10% of all children born in 1987 and regularly treated at Public Dental Service clinics in Jönköping County between 7 and 12 years of age. Data were extracted from the dental records. The most common treatments--new restorations and replacements of restorations--comprised 72% of all treatment. Replacements of restorations constituted 31% of all restorations performed between 7 and 12 years of age, and a majority (81%) of these had been made when the children were 7-9 years old. The mean defs value at 6 years of age was 1.9. The mean number of treatments performed per child between 7 and 12 years of age was 2.5. The result of the present study indicates that more treatments in the primary dentition are performed after 6 years of age than before.

Child↗
PubMed2003

The evaluation of dentition status in HIV-infected patients.

PURPOSE: The aim of the study was the evaluation of dentition status in patients infected with HIV. MATERIAL AND METHODS: We examined 30 HIV + patients, aged 20-46 and 30 non-infected subjects as the control group. Oral hygiene and dentition status were estimated. Oral hygiene status using simplified OHI-plague index according to Green and Vermilion. Dentition status was analysed using decay intensity index (DMF) as well as teeth loss index according to Rogowiec. The results were analysed in dependence on HIV infection with regard to infection time. RESULTS: The results point to a high intensity of decay in HIV+ patients (23.66). There was a positive correlation between infection time and decay intensity and teeth loss evaluated using Rogowiec index. Unsatisfactory oral hygiene status (OHI > or = 1) was observed in 53.33% of infected patients. There is a relation between infection time and oral hygiene status. OHI-plague index increased in patients with infection time longer than 5 years up to 2.99 (patients with shorter than 5 years infection time--1.17 and the control group--0.57). CONCLUSIONS: 1. There is a positive correlation between HIV infection and dentition status and oral hygiene. 2. Infection time influences index values: decay intensity, teeth missing, and oral hygiene. 3. HIV+ subjects are patients of high necessity of therapy and because of their basic disease they should come within broadened health education and prophylactic activities.

Adult↗
PubMed2002

[The establishment of 3D geometry model element for dentition defect restoration].

OBJECTIVE: To establish the library including all elements for the restoration of removable partial dentition defect. METHODS: To design and reconstruct every element that could be used to build up 3D geometry stimulation for any kind of restoration. The restoration made up of elements could be edited and changed easily for proper dentition defect. And the different restoration for the same defect can be got easily. RESULTS: Established the library of all elements for restoration of removable partial dentition defect. CONCLUSION: Established the elements library. It avoided the much work repeated and improved efficiency.The elements were the important base works for the further research on dentition defect restoration and instruction system.

English Abstract↗
PubMed2005

[The malocclusion of primary dentition in the suburb of Chengdu: a cross-section survey].

OBJECTIVE: To reveal malocclusion of primary dentition in the suburb of Chengdu. METHODS: Cross-section survey and malocclusion rate calculation were performed. RESULTS: There are 491 children with malocclusion from total 1 279 children; the rate of malocclusion is 38.38%. The most important malocclusion in primary dentition are over bite (III degrees), anterior cross bite, edge to edge bite, early loss of deciduous teeth, fused teeth. CONCLUSION: The rate of malocclusion of primary dentition in the suburb of Chengdu is a little bit light. Much work should be done to prevent or treat the malocclusion of primary dentition.

Child↗
PubMed1991

Five-year follow-up of mandibular dysfunction in adolescents with intact and restored dentitions: a comparative anamnestic and clinical study.

Signs and symptoms of mandibular dysfunction were re-examined in 189 subjects, aged 18 to 20 years, 5 years after the first examination. One hundred nine subjects had restored dentitions at both examinations (group F), 36 subjects with previously intact dentitions had had fillings in their teeth during the follow-up period (group FI), and 44 subjects had intact dentitions at both examinations (group I). The subjects with restored dentitions had a higher degree and frequency of mandibular dysfunction than the subjects with intact teeth. The subjects who had had fillings during the follow-up period (group FI) constituted a group between groups F and I with respect to signs and symptoms of mandibular dysfunction. This strengthens the authors' earlier suspicions that dental filling therapy is of greater etiologic importance in mandibular dysfunction than had been thought previously. However, more studies are necessary to find the exact mechanisms involved.

Adolescent↗
PubMed1991

[Double teeth in primary dentition and findings of permanent successors].

Prevalence of double teeth in primary dentition of 0.5% was established in the sample of 2.987 preschool children of Zagreb. Between children with double teeth 60% were female and 40% males. Fusion ocurred in 66.7 percent and germination in 33.3 percent in the sample of children having double teeth. In all children with double teeth orthopantomograms were taken. Analysis of radiographs revealed anomalies of permanent successors in 53.3 percent of all children with double primary teeth. In children with germination in primary dentition anomalies of permanent teeth were present in 20 percent (hyperdontia in all cases), while fusion of deciduous teeth was accompanied by abnormal finding (hypodontia) in permanent dentition in 70 percent. Obtained results pointed out to the need of distinction between type of double teeth in primary dentition, i.e. between fusion and germination because chance of lacking the permanent successors is considerably dependent on the type of anomaly.

Anodontia↗
PubMed1990

The quasi-fixed point for the linearised deciduous dentition plot.

As Masuyama has indicated, the existence of a quasi-fixed point on the linearised dentition plot is useful in forecasting the age at which subsequent teeth will erupt, once the first eruption was observed. He proposed two methods (direct and indirect) for finding this quasi-fixed point. The direct method is based on individual data obtained by longitudinal research, and the indirect method is to estimate it from the mean and standard deviation of the age of eruption. We first examined whether the two methods give the same result with Kitamura's data, which lists the ages of eruption for individuals. When we used the indirect method, the estimates in both sexes were not valid and did not coincide with those from the direct method. However, when we considered a selected group of subjects with good linearization of dentition, the results obtained from the two methods were sufficiently close. Secondly, we attempted to determine the quasi-fixed point (C, C) in many other reports published in the past. Since almost all papers on dentition have not published individual data, we could only use the indirect method. The estimates of C differed considerably, but all of the quasi-fixed points occurred in the late stages of dentition. When we excluded deciduous central incisor from the data, the range of C narrowed and the value varied from about 1.3 (20 months) to about 1.5 (31.6 months).

Age Factors↗
PubMed1990

Deciduous dentition of a Late Archaic population of Ohio.

I describe the developmental, metric, morphologic, and pathologic features of deciduous dentition in a terminal Late Archaic (c. 3000 B.P.) Native American population in Ohio. Development of deciduous dentition in this Late Archaic population is stable with little sequence variation. The pattern of development (ldc, ldp3, ldp4) cannot be shown to be different from a modern Euro-American sample. There is an indication, however, that the permanent first molar in the Late Archaic population developed somewhat more rapidly with respect to the deciduous teeth than in the Euro-American sample. Metric and morphologic features of deciduous dentition in the Late Archaic population appear typical for a population of northeast Asian descent. In general, these metric and morphologic features are shown to be useful in distinguishing among populations of differing ancestries. Developmental and acquired pathologic conditions of deciduous dentition are rare or absent in the Late Archaic population. Absence of linear enamel hypoplasia indicates sufficient access to basic resources for the younger children of this population, and the low frequency of caries reflects the relatively cariogenic-free nature of the diet of these hunter-gatherers.

Biological Evolution↗
PubMed1990

On occlusal forces in dentitions with implant-supported fixed cantilever prostheses.

The main aims of this thesis were (1) to study the functional characteristics of dentitions with mandibular implant-supported fixed cantilever prostheses - IFCP s- occluding with complete dentures, (2) to study in detail the magnitudes and distributions of axially directed closing and chewing forces in such dentitions, (3) to study the influence of number and distribution of occlusal contacts on the magnitude and distribution of closing and chewing forces, (4) to assess the vertical bending moment and the resulting vertical bending stress in the cantilever joints and (5) to find out whether the force distribution over the cantilever beams and the resulting vertical bending stress in the cantilever joint are influenced by the type of prosthetic construction in the opposing jaw. Closing and chewing forces were registered in altogether seventeen subjects by means of miniature strain gauge transducers mounted bilaterally and symmetrically in performed matrices in prosthetic appliances. Four, six or eight transducers, evenly distributed over the tooth-arch, permitted registrations of axially directed occlusal forces in several occluding areas simultaneously. In Papers I-IV, the implant-supported prostheses were installed in the mandible and occluded with complete dentures. In Paper V, group A, the fixture-supported prostheses were installed in the maxilla and occluded with tooth-supported fixed partial dentures whereas in group B, the arrangements were analogous to those in Papers I-IV. All subjects exhibited a rhythmic chewing pattern and preferred one side for chewing although both sides were used. Most chewing sequences were terminated with swallowing with occlusal force development. The mean total forces acting over the tooth-arch varied somewhat between groups and occlusal arrangements but averaged 350 and 170 N for closing and chewing respectively. Closing and chewing forces increased distally along the cantilever beams when occluding with complete dentures and decreased distally when occluding with fixed partial dentures. The distally increasing force distribution pattern could be altered to a distally decreasing force distribution pattern by infraoccluding the second cantilever unit by as little as 100 microns. Calculated vertical bending moments and stresses in the cantilever joints of the preferred chewing sides created by closing and chewing forces were larger in dentitions where the IFCP occluded with a complete denture than in dentitions where the IFCP occluded with a tooth-supported fixed partial denture.

Adult↗
PubMed1989

[Development of an analyzing system of multiple points for mandibular movements using Selspot and its application to lateral excursions in children with primary dentition].

An analyzing system of multiple points for mandibular movements using Selspot was developed in this study. This measuring system is able to analyze simultaneously the movements of multiple required points in three dimensions, and was proved to be sufficient for use with young children because of the small burden imposed on them while taking measurements. Regarding the accuracy of this system, a method to correct the three dimensional distortion of the output values was devised, and a computer program was developed for this method. Therefore, the three dimensional distance between input values and corrected values was squeezed to 60 microns on the average for 80 points which were arrayed in the three dimensional lattice within the range for measurement. By using this measuring system, lateral excursions from the centric occlusion were measured in 9 children (3 boys and 6 girls) with primary dentition. The distance and direction of movements were then calculated around 5 analyzed points on their lower dentition (incisal point, right and left primary canines, right and left primary second molars). For comparing each movement, lateral excursions were standardized at the distance of 2 mm and 4 mm for which the incisal point moved. As a result, the primary second molar point at the working side showed the smallest movement, and the primary canine point at the balancing side showed the largest one. According to the angle of frontal and sagittal projection, the larger the distance of the mandibular movements increased, the more horizontally the lower dentition shifted. The angle of horizontal projection scarcely varied during two standardized movements. Right and left lateral excursions of each subject were statistically very symmetrical. Comparing with formerly reported data for adults, it was thought that the lateral excursions of children with primary dentition shifted more forward and more horizontally.

Child↗
PubMed1988

The associations of age and dentition status with caries treatment in adult males.

This study explores patterns of treatment for caries in adults. Data were collected as part of the Veterans Administration Dental Longitudinal Study. The 698 subjects received comprehensive dental examinations at three-year intervals for approximately ten years. The subjects were classified into three age groups and three dentition status categories. Total need for treatment was defined as the number of surfaces that initially had caries plus those developing caries over the three subsequent examinations. Analysis of variance was used to determine if there were significant associations between age or dentition status groups and the percent of total need that was treated by extraction, treated by restoration, or remained untreated. Significant associations were noted: (1) between age and the percent of carious surfaces extracted, (2) between dentition status and the percent of carious surfaces restored, and (3) between dentition status and the percent of surfaces extracted. These findings were interpreted to indicate that future cohorts of older patients with greater numbers of teeth are likely to seek operative treatment for diagnosed caries.

Adult↗
PubMed2000

Serial extraction or premolar extraction in the permanent dentition? Comparison of duration and outcome of orthodontic treatment.

Treatment outcome and duration of 2 different treatment approaches in 2 groups of comparable extraction cases were analyzed: Group I: serial extraction performed in the early mixed dentition followed by orthodontic treatment in the permanent dentition; group II: extractions as well as orthodontic treatment in the permanent dentition. The following conclusions were reached: 1. The treatment period with fixed appliances was highly significantly shorter in group I; however, the number of appointments was significantly higher and the total duration of treatment/observation time significantly longer. 2. In both groups the reduction in PAR score was either improved or greatly improved in all cases.

Adolescent↗
PubMed1999

Longitudinal occlusal changes from primary to permanent dentition in children with normal primary occlusion.

This purpose of this research was to examine the stability of normal occlusion during the transition from primary to permanent dentition. The sample consisted of 128 children (83 boys and 45 girls) 4.5 to 5.5 years old with normal occlusion in the primary dentition. The subjects were reexamined at 12.5 to 13.5 years. None had received orthodontic treatment. Although all the subjects had normal occlusion in the primary dentition, 72.7% (73.5% boys and 71.1% girls) had developed anomalies following eruption of the permanent teeth. These anomalies included crowding, Class II Division 1 or Class II Division 2 malocclusion, mesial occlusion complex, lateral crossbite, anterior crossbite, premature tooth loss, openbite or other anomalies.

Adolescent↗
PubMed1997

Craniofacial parameters during growth from the deciduous to permanent dentition--a longitudinal study.

Data on the dynamics of craniofacial growth, obtained by simple non-invasive measurements, are scarce in comparison with those collected by cephalometric methods. The aim of this study was to measure a number of craniofacial parameters, and to evaluate their changes during transition from the deciduous to the permanent dentition. A sample of 61 subjects (32 boys and 29 girls) were followed longitudinally by annual examination from an initial mean age of 4.7 years to a final mean age of 11.8 years. Conventional anthropometric instruments were employed to measure six craniofacial variables: G-Op, Eu-Eu, Zy-Zy, Go-Go, N-Gn and N-Pr. The data were analysed using basic summary statistics and a longitudinal regression model. A difference between males and females was found for all variables during the study period. During the transition from deciduous to mixed dentition (4.7-7.5 years), the cranial breadth and length (Eu-Eu and G-Op) decreased followed by an increase during the mixed dentition. All other parameters showed a continuous increase, which was highest for the variables defining facial height.

Anthropometry↗
PubMed1983

Variations in the particles produced at the end of mastication in subjects with different types of dentition.

The final composition of the size of particles of food or the swallowable composition (SC) has been investigated in subjects with different types of dentition. A convenient mouthful of hard-baked soya beans was masticated and thereafter the bolus was dried, sieved and weighed. Full denture wearers prepared a SC with a mode value around 4000 microns whereas subjects with mixed dentition prepared a SC with a mode value around 2000 microns. Subjects with partial dentition produced wide variations in the SC. To produce a SC which is usually swallowed by a particular subject the quantity of masticated food should bear an optimum ratio to the area of the healthy oral tissues.

Adolescent↗
PubMed1996

[Correlation between physical development and dentition based on the Jena Longitudinal Study].

In this paper body height, body weight and several head measurements from children with different dental age were compared. In addition it was investigated, if the increasing rates in the body and head measurements in the separate dentition. It could be shown, that in body measurements as well as in head measurements late teether seem to have a tendency to the smallest mean values, early teether show a tendency to higher mean values. This trend is in girls clearer than in boys. The increasing rates of the body and head measurements differ in the separate dentition stages, but do not allow conclusions of the dentition process.

Age Determination by Teeth↗