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At least 1,333 records · Page 74Linked to original sources
PubMed1976

[General anesthesia for multiple dental extractions].

Between 1970 and 1975, 528 sessions of teeth extractions were carried out under general anaesthesia at the Ambroise Paré Hospital in Boulogne. The distribution was as follows: -70 multiple dental extractions in cardiac patients, mostly sent up by cardiology units outside the establishment. -458 multiple dental extractions for orthodontic treatment, germectomies, removal of included or supernumerary teeth, contra-indication or refusal of local anaesthetic. Since 1972, all patients for whom a surgical decision was considered were examined at the Anaesthetic out-patients and the advantages appear obvious. The type of premedication, the choice of the anesthetic technique were classical in the vast majority of cases and, in particular, intubation was carried out as a routine.

Adolescent↗
PubMedDate not supplied

Radiographic evaluation of third-molar development in a group of Turkish children.

The aim of this investigation was to evaluate the crypt formation and calcification of the maxillary and mandibular third molars according to age and gender on panoramic radiographs in a group of Turkish children. Four hundred panoramic radiographs of 188 female and 212 male dental patients, ages six to thirteen years, were examined by two observers. The interrater reliability was tested by Kappa statistics. The earliest age for maxillary third molar crypt formation was eight years; mandibular third molars could be seen radiographically as early as seven years.

Adolescent↗
PubMed2000

[Conservative therapy in dentigerous cysts. A case report].

Dentigerous cysts are one of the most common embryological anomalies of the maxilla and mandible. They are connected with one or more permanent tooth germs. For this reason, therapy is very important to preserve the vitality of the permanent germs and to allow them a complete growth and a functional migration in the alveolar arch. In the present paper, the clinical features and the surgical conservative treatment of a case personally observed, are described.

Child↗
PubMed2000

Correction of posterior crossbite in the primary dentition.

This study shows the types of malocclusions that can be treated in the primary dentition and advocates correction of maxillary constrictions from five years of age onwards, when such constrictions lead to crossbites. A preferred method to treat maxillary constrictions is through rapid maxillary expansion (RME) with the Haas expander, even in the early stages of occlusal development. This paper presents a cross-sectional evaluation and a long-term follow-up of the upper permanent incisors during the active and passive phases of RME and shows no signs of root or pulp alterations.

Child↗
PubMed1995

Ultrastructural immunolocalization of enamel matrix proteins during early stages of ameloblast differentiation.

Enamel matrix proteins (EMP) represent specific molecular markers of ameloblast secretion. In order to study early differentiation stages of the cells of the inner enamel epithelium, we have investigated the ultrastructural localization of EMP-immunoreactivity in rat tooth germ. Pre-secretory stages of ameloblast differentiation were identified by the absence of EMP-immunoreactivity within epithelial cells as well as adjoining extra-cellular matrix. During subsequent secretory stages EMP-like immunoreactive material could be detected both within epithelial cells as well as within the adjoining extra-cellular matrix. The intensity of the immunoreactivity increased while advancing with the differentiation of epithelial cells. Intracellularly, EMP-immunoreactivity was detectable in cytoplasmic compartments involved in exocrine secretion pathway. During the early secretory stage, EMP-immunoreactive material was also detectable in the basement membrane of the epithelial-mesenchymal interface and within the pre-dentine, close to odontoblast plasma membranes and processes. It is thus suggested that EMP may cross the basement membrane between epithelial and mesenchymal cells. Our study suggests that this aspect might be important in molecular mechanisms that regulate epithelial-mesenchymal interactions during odontogenesis.

Ameloblasts↗
PubMed1999

[Cloning and partially sequencing of mouse dentin sialophosphoprotein encoding mature protein].

OBJECTIVE: Cloning and partially sequencing of mouse dentin sialophosphoprotein (DSPP) encoding mature protein. METHODS: Total RNA was extracted from the tooth germs of newborn mouse by acid guanidinium thiocyanata-phenol-chloroform method, the desired DNA product was obtained from the total RNA by RT-PCR with the primers including Oligo(dt) and two gene specific primers. The segment (about 3 Kbp) was inserted into pBluescript vector and the interesting plasmid was transformed into E. Coli host strain XL1-Blue. The double-stranded DNA of the positive clone was analyzed by restriction endonuclease mapping and DNA sequencing. RESULTS: The restriction endonuclease map and sequence of mouse DSPP encoding mature protein were consistent with those of the published. CONCLUSION: The mouse DSPP cDNA encoding mature protein was obtained for further study.

Animals↗
PubMedDate not supplied

Adequacy of mandibular premolar position despite early loss of its deciduous molar.

The mandibular second premolar (MnP2) tooth is one of the most commonly impacted teeth. Early loss of its deciduous predecessor has long been suggested to be a factor in the etiology of the MnP2 impaction. In this study, panoramic roentgenograms were used to measure the angular position of the unerupted MnP2 in 85 children. The study was carried out to test whether early loss of the lower second primary molar (dM2) correlates with MnP2 malpositions that are measurably greater than those from a control sample. The results show a small and statistically insignificant difference between the mean angles in cases with (79.6 degrees) and without (83.2 degrees) dM2. To eliminate individual factors, e.g., genetics, 2 sides of the same patient, with and without dM2, were compared. The group with the missing dM2 on one side showed higher angle differences, compared with the control group. However, the differences were still small (approximately 4 degrees) and statistically insignificant. Our findings do not show a significant influence of early loss of dM2 on the inclination of the unerupted MnP2, suggesting that environmental factors may be of less significance, compared with genetic ones.

Adolescent↗
PubMed2003

Immobilization of root-compromised maxillary anterior teeth: a case report with 14-year clinical follow-up.

The efficacy of a modified cast-metal resin-bonded splint was evaluated after 14 years in service. The splint was used to immobilize the root-compromised maxillary central and lateral incisors of a teenage male following relapsed orthodontic treatment. The affected teeth were indirectly traumatized, before their eruption, in a bicycle accident that resulted in avulsion of their primary predecessors. The rationale for selecting this treatment modality rather than the alternatives is discussed. The clinical protocol employed during the treatment and subsequent follow-up is described.

Adolescent↗
PubMed2003

[A mistake in the picture processing procedure?].

A 12-year old boy was referred to an orthodontist. During examination of his dental status a swelling was seen at the right side of his palate. Further examination demonstrated a central giant cell granuloma. This is a rare benign tumor that often causes local destruction of the bone and displacement of teeth. Surgical curettage of these large central giant cell granulomas gives mulilations of the jaws and loss of teeth and tooth germs. Furthermore, it has a high recurrence rate. Therefore, calcitonin was chosen as an alternative therapy.

Calcitonin↗
PubMedDate not supplied

Developmental stages of the third molar in Israeli children.

PURPOSE: The purpose of this study was to examine the developmental stages of the third molar in Israeli children, compare its development in boys and girls, in the maxilla and mandible, right to left sides in various age groups, and relate the developmental stage to chronological age. METHODS: Panoramic radiographs of 693 healthy children and adolescents (328 boys and 365 girls) ages 7 to 16 were analyzed using a modified 6-stage method. Since the 16-year-old group was too small for statistical analysis, it was later excluded from the study. Radiographs were obtained from patient files. RESULTS: There were no significant differences in the development of the third molar between boys and girls and between right and left sides. Slight differences were found between the maxilla and mandible. The first appearance of a radiolucent bud was at age 8.7 in the mandible and 9.3 in the maxilla. Crown completion was observed on average at age 11.7 in the maxilla and 11.8 in the mandible. CONCLUSIONS: There was a high correlation between third molar development and chronological age. Agenesis can be determined conclusively if no radiolucent bud is present beyond age 14. The modified 6-stage method allowed more accurate determination of developmental stages.

Adolescent↗
PubMed1992

Extracellular fluid movement in the pulp; the pulp/dentin permeability barrier.

Fluid movement in the pulp depends largely upon the physiology of the blood vessels; normally there is a net efflux of fluid and proteins from the capillaries into the extracellular environment. Most pulp capillaries lie close to the odontoblast layer and in order to see whether fluid can pass between the odontoblasts into the predentin we have perfused the vessels of molar tooth germs in anesthetized piglets with the electron dense tracer lanthanum. The results show that the tracer permeates the capillaries but encounters a barrier to permeability at the apical (predentinal) ends of the odontoblasts. The completeness of the barrier to the tracer lanthanum is discussed together with structural evidence of tight junctions between odontoblasts in both pigs and humans and the presence of collagen fibers through the tight junctional zone. It is concluded that there is little or no evidence that pulp fluid is normally confluent with predentin. An advantage of this arrangement may be that by maintaining an enclosed microenvironment it permits regulation of the orderly process of matrix deposition and mineralization of predentin to dentin. In order to maintain constant vascular and extracellular fluid pressures the capillary efflux has to be balanced by fluid removal; recent work in cats has shown that lymphatic vessels are available to transport fluid out of the pulp. In this paper the differences in the intrapulpal distribution of these vessels have been extrapolated to human teeth in an attempt to explain certain variations in the symptoms and progress of pulpal inflammatory conditions.

Animals↗