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PubMedDate not supplied

The value of a baseline caries risk assessment model in the primary dentition for the prediction of caries incidence in the permanent dentition.

To establish a reliable screening method for caries prediction and to identify predominant risk factors, this study tested whether a cross-sectional caries risk model assessed at age 7 could be used to predict future caries onset in the permanent first molars at age 10 in 3,303 children born in 1989. As prediction variables, assessing the believed risk, baseline data at age 7 on oral health status, oral hygiene level, oral health behaviour and sociodemographic factors were used. The real risk, based on data collected for the first permanent molars during the follow-up, was assessed by different approaches. Cumulative incidence during the 3-year observation period was 31.6%, ranging from 22.4% in the believed low-risk group to 43.2% in the believed high-risk group. A stepwise logistic regression analysis was performed with net caries increment as outcome measure, adjusted for the real time at risk, using eruption times. Baseline dmfs and occlusal and buccal plaque indices were highly significant for having a high caries increment in permanent first molars with respective odds ratios of 1.07, 1.43 and 1.35. Brushing less than once a day and the daily use of sugar-containing drinks between meals were confirmed as risk factors (OR 2.43 and 1.25, respectively). The logistic regression analysis provided a sensitivity of 59-66% and a specificity of 65.7-72.8%, which indicates that the risk marker did not have an important predictive power. None of the socio-demographic and behavioural variables had enough predictive power at community level to be useful for identifying caries susceptible children. Even the power of dmfs at baseline must be considered modest.

Beverages↗
PubMed1990

[Numerical anomalies of the dentition with respect to various types of teeth. 2. (Molars and multiple anomalies). Dentition anomalies among cases of a district dentist, 7].

The significance of the numerical anomalies of the teeth is seen for the general medical science that it may be helpful for solving of questions raised by other hereditary anomalies. This report deals with the numerical anomalies of the molars, and it reports the variety of the multiple numerical anomalies. The latters may appear very multifarously and may occur extremities (complete edentulousness and jaw bone doubling, respectively), too.

Abnormalities, Multiple↗
PubMed1998

Distribution patterns of primary and permanent dentition in children with unilateral complete cleft lip and palate.

OBJECTIVE: To investigate the distribution patterns of primary and permanent teeth in the cleft area and the numerical variation in teeth in unilateral complete cleft lip and palate (UCLP) patients. DESIGN: A survey of the dentition in UCLP patients. SETTING: Craniofacial Center, Chang Gung Memorial Hospital, Taipei, Taiwan. PATIENTS: 137 UCLP patients who met the following criteria: (1) have had at least one panoramic film taken, (2) the first panoramic film illustrates either primary or early mixed dentition. Evaluation of both permanent and primary dentition was available in 91 cases. MAIN OUTCOME MEASURES: Two evaluators performed independent evaluations of number and distribution of teeth in UCLP patients. The hypothesis that there are two odontogenic origins for maxillary lateral incisors was proposed to explain the occurrence of distribution patterns of dentition in the cleft area and to explain differences between primary and permanent dentition in UCLP patients. RESULTS: Four distribution patterns in the cleft area were identified in both the primary and the permanent dentition. In the primary dentition, placement of the lateral incisor distal to the alveolar cleft was the predominant pattern (pattern y, 82.4%), followed by absence of the cleft side maxillary lateral incisor (pattern ab, 9.9%), presence of one tooth on each side of the alveolar cleft (pattern xy, 5.5%), and placement of the lateral incisor mesial to the alveolar cleft (pattern x, 2.2%). In the permanent dentition, the most common pattern was the absence of the maxillary lateral incisor on the cleft side (pattern AB, 51.8%), followed by lateral incisor placement distal to the alveolar cleft (pattern Y, 46%), lateral incisor placement mesial to the alveolar cleft (pattern X, 1.5%) and the presence of one tooth on each side of the alveolar cleft (pattern XY, 0.7%). The discrepancy between the distribution patterns of primary dentition and permanent dentition successors is 57.1%. Variations in tooth number in both primary and permanent dentition of UCLP patients occurred most often in the cleft area. Abnormalities in the number of teeth (hypodontia or hyperdontia) outside the cleft area were more common in the permanent dentition than in the primary dentition (24.1% versus 4.4%). CONCLUSIONS: Four distribution patterns in the cleft area were identified in both sets of dentition. Our findings of distribution patterns in UCLP patients support the hypothesis that there may be two odontogenic origins for maxillary lateral incisors. Clinicians involved in managing the dentition of UCLP patients should consider the high frequency of numerical variation both in and outside the cleft area before starting dental treatment.

Anodontia↗
PubMed1988

Changes in the molar relationship between the deciduous and permanent dentitions: a longitudinal study.

The purpose of this study was to describe the changes in the molar relationship from the deciduous dentition to the permanent dentition in 121 subjects from the Iowa Longitudinal Growth Study. In addition, an attempt was made to determine the association between the various dentofacial variables and the changes in the molar relationship in 55 persons (33 male and 22 female subjects) with normal occlusion. All subjects were evaluated at three stages of dental development: stage I, completion of the deciduous dentition (means age = 4.94 years); stage II, when permanent first molars initially erupt into occlusion (means age = 6.91 years); and stage III, at the completion of eruption of the permanent dentition excluding third molars (means age = 13.01 years). The following sets of variables were evaluated: molar relationship, mesiodistal crown diameters of single and groups of deciduous and permanent teeth, dental arch widths, arch lengths, and various cephalometric dentofacial variables. Correlation coefficients and regression analyses were used to assess the relationships between these measurements and the changes in the molar relationship from the deciduous to the permanent dentition. The findings indicate that of the 242 sides evaluated in the deciduous dentition, 61.6% developed into a Class I molar relationship, 34.3% into Class II, and 4.1% into Class III. Those sides that started with a distal step in the deciduous dentition proceeded to develop into a Class II molar relationship in the permanent dentition. Of the sides with a flush terminal plane relationship in the deciduous dentition, 56% progressed to a Class I molar relationship and 44% to Class II in the permanent dentition. The presence of a mesial step in the deciduous dentition indicates a greater probability for a Class I molar relationship and a lesser probability for a Class II molar relationship. In the 55 subjects who achieved normal occlusion, the magnitude of change in the molar relationship was 1.91 mm in male subjects and 1.64 mm in female subjects. On the average, these cases had a mesial step in the deciduous dentition of 0.8 mm in male subjects and 1.0 mm in female subjects. There was a favorable difference between the maxillary and mandibular leeway spaces of 1.3 mm in male subjects and 1.1 mm in female subjects. There was also a favorable decrease in the Wits appraisal of 1.2 mm in male subjects and 0.6 mm in female subjects.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1994

Epithelial remnants in the crestal periodontium of the deciduous and permanent dentition of beagle dogs.

The purpose of this study was to document and characterize epithelial remnants (EPRs) of the crestal periodontium of the deciduous dentition of a diphyodont and compare them with EPR units found in the corresponding area of the permanent dentition. 7 beagle dogs were used. At the age of 10 weeks (deciduous dentition) and 15 months (permanent dentition), respectively, a 6-week plaque control period was initiated. At the end of each plaque control period, biopsies were obtained from the mandibular 02P, 03P (deciduous dentition) and P3, P4 (permanent dentition) premolar regions and prepared for histologic analysis. 2 regions, (1) the supracrestal region and (2) the periodontal ligament region, were identified. The supracrestal region was divided into 4 compartments of equal height. The histologic parameters studied included the (i) EPR frequency: number of EPRs/mm of root length, (ii) EPR size, (iii) EPR-root distance, (iv) EPR-bone distance and (v) cell area. No differences were observed between the 2 dentitions with respect to the number, size and relative location of EPR units in the supracrestal regions or the periodontal ligament regions. Epithelial remnants of the supracrestal region in both dentitions tended to be more frequent, larger and positioned further from the root surface than the EPRs of the periodontal ligament region. EPR units of the periodontal ligament region were located significantly further from the bone in the deciduous dentition than in the permanent dentition. The cell area of EPRs did not differ between the 2 dentitions.(ABSTRACT TRUNCATED AT 250 WORDS)

Alveolar Process↗
PubMed2003

Orthodontic findings in the deciduous and early mixed dentition--inferences for a preventive strategy.

AIM AND METHOD: The aim of the present epidemiologic study was to obtain representative basic data on the frequency, extent and age-dependence of malocclusions in the deciduous and early mixed dentition. The developmental tendencies of specific malocclusions were investigated from the aspect of orthodontic prevention. The collective comprised 8,864 preschool and school-aged children, of whom 1,225 were in the deciduous dentition (mean age 4.5 years) and 7,639 in the mixed dentition (mean age 8.9 years). The orthodontic data were clinically assessed as sagittal, transversal, or vertical single-arch and occlusal findings. In addition, the malocclusions were classified according to their primary symptoms. Early infantile habits, tongue dysfunctions, speech defects and incompetent lip closure were registered separately. RESULTS: 57% of the children were found to have malocclusions, with the frequency rising statistically significantly in dependence on age from the deciduous to the mixed dentition (p < or = 0.001). The mean extent of excessive overjet increased significantly from the deciduous to the mixed dentition. Crossbite with mandibular midline discrepancies were observed significantly more frequently in the deciduous dentition. Although the frequency of anterior open bite underwent a significant decline from the deciduous to the mixed dentition, open bite was the malocclusion most frequently associated with dysfunction in both groups. The significant increase in traumatic deep bite in the mixed dentition indicates an unfavorable developmental tendency in this anomaly until after the eruption of the permanent incisors. CONCLUSION: The need for preventive orthodontic therapy and for the intensified application of interceptive and early treatment measures is stressed in view of the high number of malalignments and malocclusions in the deciduous and mixed dentition and the tendency for some forms of malocclusion to deteriorate as the dentition develops.

Adolescent↗
PubMed1984

Larval vs. adult pharyngeal dentition in some Japanese cyprinid fishes.

The development of the pharyngeal dentition was examined in 13 species of five subfamilies of the family Cyprinidae. A previously described difference between the larval and adult dentition in Gnathopogon caerulescens was observed in 11 species of Gobioinae, Cyprininae, Leuciscinae, and Danioinae, but was not seen in two species of Acheilognathinae. The adult dentition is usually complete by the later larval or juvenile period. In the adult dentition, the functioning teeth are generally shed at each position, when the replacement tooth has been ankylosed to the bone, or when the germ of that tooth has grown sufficiently. In the larval dentition, however, the replacement tooth is ankylosed medial to the functioning tooth, so the older functioning tooth is retained after ankylosis of the replacement tooth. That is why the dentigerous surface of the bone grows rapidly during the larval period. Each tooth row represents a single replacement wave. The distribution and pattern of the central teeth are exactly the same in all types of the larval dentition. However, those of the anterior teeth vary between and within different species. The larval dentition develops into the major row of the adult dentition through tooth replacements. The number of tooth families in the larval dentition is completely consistent with the tooth number of the major row in the adult dentition. Therefore, the number of major row teeth owes its variation to that in the appearance pattern of the anterior teeth.

Animals↗
PubMedDate not supplied

Longitudinal evaluation of caries patterns form the primary to the mixed dentition.

The purpose of this study was to develop a model describing the sites and patterns of dental caries in the mixed dentition for children with one of five caries experiences in the primary dentition. Dental records were used from 317 children followed an average of 7.8 years in private pediatric dental offices to assess specific caries experiences in children from early primary dentition to middle or late mixed dentition. Eighty-four per cent of the children who were caries-free in the primary dentition remained so in the mixed dentition. Children with the pit and fissure caries pattern in the primary dentition were more likely to develop smooth surface caries of primary teeth in the mixed dentition (32%) than caries-free children (14%, X2 = 5.6;P less than 0.05). For children with molar-approximal lesions in the primary dentition, 57% developed lesions on additional molar-approximal surfaces in the primary teeth in the mixed dentition. Children with the faciolingual pattern (baby bottle tooth decay) were at the highest risk of any group for developing additional carious lesions. The model could serve as a basis for a prospective study.

Adolescent↗
PubMed1987

Function and dysfunction of the masticatory system in individuals with intact and restored dentitions. A clinical, psychological and physiological study.

In all, 125 individuals, 13-23 years old, with intact dentitions and 163 individuals, 13-20 years old, with dental fillings were included in a series of studies. The results of the studies suggest that subjects with intact dentitions have a lower prevalence and degree of signs and symptoms of mandibular dysfunction than subjects with restorations in the teeth. However, most signs and symptoms in both groups were mild and infrequent. The most common symptoms in both groups were TMJ-sounds, tiredness during chewing, and headache, and the most common clinical signs were TMJ-sounds and muscles tender to palpation. Fossa bottom facets were more common in restored dentitions and they often involved fillings. In restored dentitions, dentin facets were more common, the worn area was on average larger and the distal marginal crest of the second lower molars were more often worn indicating a difference in functional activity between the groups, with more parafunctional activity in restored dentitions. According to the Karolinska Scales of Personality (KSP), the subjects with restored dentitions had higher values on the "muscular tension" and "somatic anxiety" scales, i.e. dental restorations were more common in subjects with autonomic and motor disturbances related to anxiety-proneness. The subjects with restored dentitions had lower bite force values during "gentle biting" in the frontal region. The occlusal perception increased from the more posterior test position to the anterior one in both groups. The best tactile sensibility was found in the incisor region, where the subjects with restored dentitions tended to have better values. The higher prevalence and degree of clinically recorded dysfunction in subjects with restored dentitions was confirmed in the follow-up study. The findings of this investigation indicate a possible etiological significance of dental filling therapy in mandibular dysfunction. For the moment, however, we do not know if, how and to what extent occlusal factors, psychological differences between the subjects, or combinations of these or other factors are responsible for the development of signs and symptoms in the masticatory system. Nevertheless, the findings indicate that the factor "dental filling therapy" merits more consideration and more extensive research and should be included in epidemiological studies in the future. There is no indication in the results that toxic effects of the fillings could have influenced the results but further studies might be desirable, especially longitudinal comparisons between subjects with intact and restored dentitions.

Adolescent↗