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Results for “Tooth, Unerupted”

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At least 271 records · Page 15Linked to original sources

PubMed2003

Mixed dentition analysis in a Senegalese population: elaboration of prediction tables.

Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Three main methods have been used to estimate the mesiodistal crown widths of unerupted canines and premolars: direct measurements on radiographs; calculations from prediction equations and tables; and a combination of radiographic measurements and prediction tables. Because there are clear racial differences in tooth sizes, the objectives of this study were to produce odontometric data, correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and the canine and premolars for each quadrant, and prediction tables with the regression equations, specifically for Senegalese children. Fifty black Senegalese students (25 women, 25 men, mean age 23.50 years) were selected from the University Cheikh Anta Diop in Dakar, Senegal. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and that of the maxillary and mandibular canines and premolars were found to be 0.53 and 0.70, respectively. The standard error of the estimate was better (0.66) for women in the maxilla, and the r(2) values ranged from 0.46 to 0.57 for both sexes. Prediction tables were prepared. The accuracy of the prediction tables should be tested in a larger sample including more ethnic groups.

Adult↗

PubMed1999

The use of panoramic radiographs to localize displaced maxillary canines.

OBJECTIVE: The purpose of this investigation was to develop a reliable method of diagnosing the position of a displaced maxillary canine on the basis of a single panoramic radiograph. STUDY DESIGN: A total of 115 panoramic radiographs depicting 164 displaced maxillary canines were evaluated. The ratio of the width of the displaced canine to the width of the homolateral central incisor (the canine-incisor index) and the ratio of the width of the displaced canine to the width of the contralateral canine (the canine-canine index) were calculated. The height of the crown of each displaced canine was classified in the vertical plane, relative to the adjacent incisor, as apical, middle, or coronal. RESULTS: There was an overlap in the canine-incisor index ranges of the buccal (0.94-1. 45) and palatal (1.15-1.29) canines in the apical zone. In the middle and coronal zones, a clear difference could be seen between the canine-incisor indices of labially (0.78-1.11) and palatally (1.15-1.7) located canines. A cut-off point of 1.15 was determined. CONCLUSIONS: Provided that vertical restriction and the canine-incisor index are used, the panoramic radiograph can serve as a useful indicator for determining the position of an unerupted maxillary canine.

Adolescent↗

PubMed1987

The effects of differing etch times on the etch pattern on enamel of unerupted and erupted human teeth examined using the scanning electron microscope.

The etch pattern produced on enamel from unerupted and erupted human teeth with varying periods of acid etching using 37 per cent phosphoric acid was examined using a scanning electron microscope. For erupted enamel etch scores were fairly consistent above 10 seconds etching, for unerupted enamel etch scores matched those for erupted enamel for etch times above 30 seconds. The etch type was more consistent on unerupted enamel.

Acid Etching, Dental↗

PubMedDate not supplied

Pre-eruptive intracoronal radiolucent defect: a case of a nonprogressive lesion.

Pre-eruptive intracoronal resorption or defect is an unusual radiolucency located in the dentin, just beneath the dentin-enamel junction of unerupted teeth. The pathogenesis of the phenomenon is unclear. The present case with a radiolucency that has not changed in its dimension over a period of almost 7 years, until tooth eruption, raises a question about the progressive nature of the defect that is defined as "resorption." Resorption may not be the sole explanation for a pre-eruptive intracoronal radiolucent defect. The authors also challenge the hypothesis of "local pressure" as a prime cause for the defect. The authors conclude that, when dealing with pre-eruptive intracoronal radiolucency in permanent teeth, a conservative approach with radiographic follow-up is the recommended treatment if the lesion does not seem to endanger the pulp. Intervention can be postponed until after tooth eruption when treatment does not require surgical intervention.

Child↗

PubMed1998

Benign cementoblastoma associated with an unerupted third molar.

Benign cementoblastoma is a rare lesion representing less than 1% of all odontogenic tumours. It usually affects young people and is located in the posterior jaw. In almost all cases the tumour tends to be associated with an erupted permanent tooth, most often the first molar: only rarely has an association with an impacted or deciduous tooth been reported. The authors present a case of a cementoblastoma involving an impacted third molar.

Adult↗

PubMed1992

Evaluation of smear layers on serial sections of human dentin by means of electrochemical impedance measurements.

The alternating current impedance characteristics of a uni-directional porous glass membrane and serial sections of dentin from unerupted human third permanent molars (with and without smear layers) were measured. The membrane was equilibrated at 20 +/- 1 degrees C in a range of concentrations of unbuffered KCl, and the tooth sections were equilibrated in 0.1 mmol/L unbuffered KCl. Each section's impedance was measured for a 50-mV (rms) alternating potential difference applied over 1 Hz to 65 kHz. By means of complex non-linear least-squares regression analysis, the dc resistance of each specimen was determined. Scanning electron microscopy and subsequent image analysis enabled the cross-sectional area of the pores in the membrane and dentin tubule surface-openings to be measured. The results showed that the measured cross-sectional area of pores in the membrane was in good agreement with that calculated from the measured dc resistance and solution resistivity over the range of electrolyte concentrations. In dentin, the presence of smear layers on the cut surfaces increased the measured resistance. The resistance of the smear layer varied, suggesting that its thickness changed across the surface of the dentin. This was superimposed on regional variations in resistance of smear-free dentin which were found to be related to alterations in the number of tubules present and their cross-sectional area. The resistivities of the dentin tubule contents and smear layer material were generally lower than that of the hydrating electrolyte. It is postulated that this could be due to ions from partial dissolution of the mineral in the dentin.

Dentin↗

PubMed1992

Rough hypoplastic amelogenesis imperfecta with follicular hyperplasia.

This report documents a unique case of rough hypoplastic amelogenesis imperfecta with apparent anterior oligodontia and multiple anomalies of the associated mesenchymally derived tissues. Multiple unerupted teeth showed hypercementosis, distorted roots with aberrant dentin formation, and marked follicular hyperplasia. The hyperplastic follicles had a complex histopathologic appearance that recapitulated some features of the WHO-type odontogenic fibroma. The features of these teeth, the nature of the associated follicular lesions, and their relationship to the unerupted teeth are discussed.

Adult↗

PubMed1978

Prediction of breadth of permanent canines and premolars in the mixed dentition.

Multiple stepwise regression was used in the selection of mixed dentition variables capable of predicting the total breadth of the unerupted permanent canine and premolars. The material consisted of 77 children. Stone casts were made before and after eruption of the canine and premolars. At the first examination when the children were, on the average, 10 years old, intraoral roentgenograms were obtained of the canine and the premolars. To predict the total breadth of the upper canine and premolars the buccolingual breadth of the upper first permanent molar and measurements on roentgenograms of the breadths of the upper canine and premolars proved most useful. In the prediction of the total breadth of the lower canine and premolars the best results were obtained with measurement of the breadths of the teeth in the roentgenograms. The breadth of the incisors proved less useful as a predictor of the breadths of unerupted canines and premolars.

Bicuspid↗

PubMed1999

Eruption disturbances of maxillary permanent central incisors associated with anomalous adjacent permanent lateral incisors.

Several causes of eruption disturbances in upper permanent central incisors have been described. This report describes six cases in which the failure of maxillary permanent central incisors to erupt appears to be associated with developmental anomalies in the adjacent permanent lateral incisors. The root formation of the unerupted central incisors was delayed in comparison to the contralateral incisors as was the development of the adjacent lateral incisors. The shapes of the crowns were abnormal and in five cases out of the six described, the primary predecessors of the unerupted incisors were fused.

Child↗

PubMed2005

Do teeth want to be straight? A nonsurgical approach to unerupted teeth.

Although some orthodontists believe that ectopic labially positioned canines may erupt without surgical exposure, many articles emphasize the surgical management of the nonpalatally impacted canine. In this article, the author discusses the treatment and results of 3 cases, with a total of 4 impacted maxillary canines. All cases were treated with a conservative approach and without surgical intervention. This nontraumatic, nonsurgical approach demonstrates the viability of conservative options for the management of unerupted teeth in carefully selected cases.

Adolescent↗

PubMed1994

Case report: twin supernumerary maxillary central incisors, unerupted maxillary central incisors. Early orthodontic treatment in ten-year-old child.

This is the case report of a 10 year-old female Caucasian with a mixed dentition Class I right and Class II left side malocclusion and unerupted maxillary central incisors. It was necessary for the oral surgeon to remove twin supernumerary mesiodens prior to the placement of orthodontic appliances. Space was created to accommodate the customary, also unerupted central incisors, which were rotated 90 degrees to the midline.

Child↗

PubMed2005