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At least 667 records · Page 37Linked to original sources
PubMed1996

High-resolution observations of human premolar eruption.

Using an optical instrument based on the principle of Moire magnification to obtain resolution of less than 0.1 mu m, eruption of maxillary second premolars was observed during the prefunctional phase of eruption in 10 children. The participants were observed on four occasions for approx. 30 min each, once in the afternoon and once in the evening on two consecutive days. For all participants, a pulsatile movement of the erupting tooth was noted in concert with the arterial pulse. Significant variations in short-term eruption rates and patterns were observed, with a mean rate of 0.28 mu m/min over continuous 20-min periods but a range from -0.91 to 2.29 mu m/min. During most sessions net eruption occurred, but in several of the 30-min periods there was little movement or intrusion. An unexplained cyclic phenomenon was observed consistently, which had a period of 20-50 s and a range of magnitudes from 0.12 to 2.22 mu m. It seems clear that a discontinuous pattern of eruption occurs in short-term as well as longer-term observations.

Arteries↗
PubMed2002

Effects of calcium phosphate ceramic bone graft materials on permanent teeth eruption in beagles.

OBJECTIVE: The aim of this study was to evaluate the use of calcium phosphate ceramic (CPC) materials as a potential alternative to autogenous secondary alveolar bone grafting in cleft lip and palate patients who are in mixed dentition. SAMPLE: Four 12-week-old beagles and one 15-week-old beagle were used as subjects. INTERVENTIONS: In each experimental beagle, the third and fourth deciduous premolars were extracted. The sockets were filled with four different CPC materials and sutured. MAIN OUTCOME MEASURES The beagles were fed a soft diet for the following 8 weeks and then sacrificed for clinical, radiological, histological, transmission electron microscope (TEM), and infrared (IR) absorption analysis. RESULTS: All four experimental graft materials allowed normal development and eruption of permanent premolars. In histological sections, small particles of biphasic calcium phosphate (BCP) and carbonate apatite (CO(3)-AP) were resorbed, and large particulate forms served as bone frames in cortical bones. Polymer coated with carbonate apatite (Poly/CO(3)-AP) did not cause inflammation but was pushed away to the soft tissue by erupting teeth. Alginate coated with carbonate apatite (alginate/CO(3)-AP) caused a severe inflammatory reaction to the point of destroying a part of the dental follicle and cortical bone. In TEM, resorption activity by phagocytic cells was observed only in CO(3)-AP. Direct bonding of CO(3)-AP to the bone was observed as the electron-dense interface between bone and CO(3)-AP. CONCLUSION: BCP and CO(3)-AP proved to be suitable as alveolar bone graft materials in areas where tooth eruption occurs. Of the four materials tested, CO(3)-AP produced the best results.

Alginates↗
PubMed1998

Microradiographic aspects of the growing mandibular body during permanent premolar eruption in the dog.

In order to explore the bony changes in the mandibular body during prefunctional intraosseous eruption of premolars, 18 dogs aged from 8 to 16 wk at the beginning of experimental period, were given two intraperitoneal injections of oxytetracycline (50 mg/kg and 35 mg/kg 2 wk later) and 2 wk later a final injection of Alizarin red S (70 mg/kg). Microradiographic and fluorescent light microscopy studies showed that changes of the alveolar bony crypt walls were influenced by the growing dental germs which they surrounded. The cervical volumetric reduction, which indicates the end of crown formation, induced the apposition of lamellar and then woven bone on the adjacent alveolar walls. Furthermore, with occlusal displacement of the dental crown, the space below the tooth was immediately filled with woven bone trabeculae and chondroid tissue. The same phenomenon was observed at the level of the alveolar base, when the speed of tooth eruption was greater than that of root growth. During premolar development, the changes in the dental germ produces accommodating changes in the adjacent alveolar bone walls, and mandibular transversal growth has the same characteristics as that of a growing diaphysis.

Alveolar Process↗
PubMed1987

On the eruption pattern of the permanent incisors and first permanent molars in Paranthropus.

It has been claimed recently that Australopithecus exhibited a pattern of permanent tooth eruption like that of extant great apes, whereas a significantly different pattern was shared by Paranthropus and Homo (Dean, 1985). More particularly, each of the four Paranthropus specimens examined in that study was held to show advanced development and eruption of the permanent incisors relative to the first molar. It is demonstrated here that the eruption sequence that was posited for at least one of these four Paranthropus specimens (SK 61) is clearly erroneous, while the developmental/eruption sequences manifested by the other three specimens would appear to be more ambiguous than was claimed. Another juvenile specimen of Paranthropus (KNM-ER 1820) that was not included in Dean's study also does not necessarily support the eruption pattern that was said to characterize that taxon.

Aging↗
PubMed2003

To what extent do deviations from an ideal occlusion constitute a health risk?

Selection of patients for orthodontic treatment should be based on a thorough analysis of the consequences of malocclusions for the individual. The mere presence of deviations from the concept of the ideal occlusion should have no influence on orthodontic treatment decisions. According to available studies, the influence of malocclusion on periodontal health, speech and chewing is fairly minor. Neither can orthodontic treatment be justified as an effective means of preventing TMD but it may be indicated to reduce existing signs and symptoms of TMD in certain carefully selected cases. Interceptive or preventive orthodontic treatment may be indicated to reduce the negative influence on growth and occlusal development of functional malocclusions (anterior or lateral forced bite) or ectopic tooth eruption. Similarly, early correction of large overjet may be valuable in order to reduce the risk of traumatic injuries. Such treatment is usually motivated during the primary or mixed dentition periods. From the teenage period and onwards, psychosocial or aesthetic reasons for orthodontic treatment are dominating. Decisions to start orthodontic treatment in order to improve aesthetics should usually not be taken before the child has reached sufficient maturity for these decisions, normally after the age of 12 years. Special consideration needs to be given to subjects with craniofacial syndromes or handicap in order to develop effective treatment methods to promote as normal growth and occlusal development as possible.

Adolescent↗
PubMedDate not supplied

Role of attrition and occlusal contact in the physiology of the rat incisor: X. The part played by the periodontal ligament in the eruptive process.

Removal of the proliferating base of the rat incisor did not influence the rate of eruption which responded to changes in impediment to eruption in a fashion similar to that for control teeth. It is the peridontal ligament rather than the proliferating cells that is responsible for tooth eruption. The elements of the peridontal ligament apparently responsible for tooth movement are the mature fibroblasts.

Animals↗
PubMedDate not supplied

Systemic manifestations during eruption of primary teeth in infants.

PURPOSE: The purpose of this study was to describe the most frequent objective clinical manifestations found during the eruption of primary teeth and to assess the correlation between those symptoms and the eruption of various groups of teeth. METHODS: The study was conducted in the Clinica Infantil Colsubsidio in Bogota, Colombia. Five hundred and eighty-five children participated in the study. One-hundred and forty-five children ages 4 to 36 months who had at least 1 erupting tooth were included in the study group. The other 357 children served as a control group. Parents were asked to complete a short questionnaire and children were then checked by one of the authors. Chi-square analysis was performed to analyze information obtained for the 2 groups. Level of significance was set at P < .05. RESULTS: There were 81 girls (56%) and 64 boys (44%) in the study group, and 183 girls (54%) and 157 boys (46%) in the control group. The most frequent clinical manifestations were: drooling (15%), diarrhea (13%) and drooling-diarrhea (8%). The presence of fever and fever-diarrhea was shown in a lower percentage (8%). In the study group, boys demonstrated a higher prevalence of diarrhea than girls (P < .05). No statistical significance regarding other clinical manifestations and gender were observed. In the control group, 93% of the children did not show any clinical manifestation. CONCLUSIONS: An association has been shown between general objective manifestations like drooling (the most prevalent), fever and diarrhea, and the eruption of primary teeth. Most manifestations appeared during the eruption of the primary incisors.

Chi-Square Distribution↗
PubMed1996

A family case report: disturbances in tooth form and eruption of the second premolar.

This report describes a family who demonstrated anomalies of tooth form and eruption of the lower second premolar. Observation of the second premolars remaining in the mother's and father's dentitions included ectopic eruption with impaction and substantial spacing between the first and second premolars. Four siblings were also examined--three boys aged 15, 14 and 12 years, and one girl aged 11 years. Anomalies of the second premolar recorded in the males and female include: congenital absence, ectopic eruption with impaction, delayed eruption and spacing. Associated anomalies included: congenital absence of other permanent teeth and spacing. It appears that the defect in tooth form and eruption is of a genetic origin, affecting both males and females. The condition(s) did not appear to be associated with a syndrome and the human papilloma virus lesions noted in all family members were not considered to be related to the dental defects. This family demonstrated two anomalies of the lower second premolar: congenital absence and disturbance in tooth eruption. The question raised by this case report is whether these two anomalies are inherited as separate traits or whether failure of tooth eruption is a variation in expression of the same genetic factor that results in oligodontia.

Adolescent↗
PubMedDate not supplied

Median ages of eruption of the primary teeth in white and Hispanic children from Arizona.

PURPOSE: The purpose of this project was to establish median eruption ages of primary teeth and evaluate eruption differences between contralateral teeth by gender, ethnicity, and household income. Data was derived from a caries study of preschool children. METHODS: A total of 4,277 white (non-Hispanic) and Hispanic preschool children from Arizona were visually examined for caries and tooth eruption status by 5 examiners between February 1994 and September 1995. Analyses of eruption status were conducted using logistic regression to produce an eruption probability distribution from which median eruption ages for the primary teeth were determined. Possible differences in eruption timing between contralateral teeth by gender, ethnicity, and household income were examined. RESULTS: Eruption status of 1 tooth was significantly predictive of the pair-matched tooth for all pairs. Differences were found for the maxillary central incisor (gender) and the mandibular second molar (ethnicity). Eruption ages did not vary by household income. Median eruption ages for each of the 10 primary teeth are presented. CONCLUSIONS: This study provides contemporary median eruption ages for primary teeth.

Age Factors↗
PubMed2006

Correction of a mandibular lateral incisor-canine transposition.

Early diagnosis of a transposition can simplify the orthodontic correction. In this report, we describe the orthodontic management of a patient with mandibular right lateral incisor and canine transposition. Nonextraction therapy was performed with removable multibracket appliances. Natural tooth order was attained, and a symmetric and functional Class I occlusion was achieved.

Child↗
PubMed1996

Transposition of teeth and genetic etiology.

Twenty-one cases of transposition are presented showing a crude prevalence of 0.4%. A high rate of bilateral occurrence was seen. A significant number of cases were associated with other dental anomalies, such as peg-shaped lateral incisors and overretained deciduous teeth. Genetic etiology has been stressed and various other theories discussed.

Adolescent↗
PubMed1998

The ectopic maxillary canine: a review.

This article reviews the aetiology and management of the ectopic maxillary canine. Much controversy surrounds the causes of canine palatal ectopia. The recent evidence surrounding the genetic and guidance theories are examined. The management options are detailed and the indications for each treatment modality based on the available scientific evidence are presented. Finally, the untoward sequelae of canine ectopia are discussed.

Cuspid↗
PubMed1992

Maxillary lateral incisors of subjects with cleft lip and/or palate: Part 2.

Maxillary lateral incisors on the alveolar cleft were investigated in 431 cleft children registered in the Department of Orthodontics, Kyushu University Dental Hospital. The majority of primary maxillary lateral incisors were located on the distal side of the alveolar cleft in both unilateral cleft lip and alveolus (UCLA) and unilateral cleft lip and palate (UCLP) subjects. Permanent teeth in UCLA tend to be located distally, but in UCLP they tend to be congenitally absent (p less than .01). The majority of primary teeth had normal shapes; the majority of permanent teeth were of intermediate type or were missing congenitally. One third of the UCLA and one half of the UCLP subjects who had primary maxillary lateral incisors were not followed by permanent replacements. The location of the majority of permanent maxillary lateral incisors tallied with that of the primary ones except in four UCLA, ten UCLP, and two bilateral cleft lip and palate (BCLP) subjects. Four UCLA and ten UCLP subjects who had primary lateral incisors on the distal side were followed by their permanent successors on the mesial side. Three UCLP and one BCLP subjects had permanent maxillary lateral incisors even though they had no temporary predecessors.

Adolescent↗