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At least 919 records · Page 51Linked to original sources
PubMed1990

[Treated case with horizontally impacted mandibular first molar caused by submerged primary molar].

A case is here presented in which mandibular first molar was horizontally impacted under the submerged primary molar. The patient was an 8 year-old-boy referred from a general dentist through the Department of Pedodontics in this hospital, whose chief complaint was a horizontally impacted mandibular first molar. Skeletally, diagnosis revealed an Angle Class II Division 2 malocclusion. The impacted first molar was uprighted with a lingual arch and a utility arch following the extraction of the submerged primary molar. The submerged primary molar was probably ankylosed causing a locking of the first molar which rotated as the root formed. The result of rotation during forming twisted the roots of the first molar, which will make root canal treatment difficult if the pulp is infected in the future. It may concluded that dental arches should be carefully observed even in the deciduous dentition.

Ankylosis↗
PubMed2002

Third molar extraction. Current trends.

Extraction of third molars is the operation most frequently performed by oral and maxillofacial surgeons. The American National Institute of Health (1979) and the American Association of Oral and Maxillofacial Surgeons (1993) have organised consensus conferences to systematically analyse the scientific evidence and provide official guidelines for the management of third molars. However, some clinical aspects are still controversial: indications for preventive extraction, early extraction, prognosis of impacted teeth, continuous follow-up, relationship with anterior crowding and temporo-mandibular disorders. This article reviews the conclusions from the consensus conferences and integrates them with more recent data. The actual trend seems to justify a more conservative clinical approach rather than an aggressive extraction policy.

Adolescent↗
PubMed1995

Diseases and lesions associated with third molars. Review of 1001 cases.

This study reports on a retrospective survey of 1001 panoramic radiographs in a dental school population of persons with impacted third molars. The objective was to determine the association between pathologic conditions visible on radiographs and third molar teeth. In the series 2872 impacted third molars were examined. The most common problem seen radiolucencies. Other than caries, occurrence rates were low. Statistically significant differences in occurrences rates were seen within and between jaws for various pathologic conditions. The low rates did not offer support for the likely presence of pathologic conditions to be an indication for third molar removal.

Adolescent↗
PubMed2006

Change in third molar angulation and position in young adults and follow-up periodontal pathology.

PURPOSE: This study was designed to assess changes in third molar position and angulation in young adults and the resulting third molar periodontal probing (PD) status. PATIENTS AND METHODS: Data derived from patients with 4 asymptomatic third molars with adjacent second molars enrolled in an institutional review board approved longitudinal trial. Inclusion criteria for the trial dictated that patients be healthy and 14 to 45 years of age. Panoramic radiographs were analyzed for third molar angulation as compared with the long axis of the second molar (mesial/horizontal > or =25 degrees ) and eruption to the occlusal plane. Full mouth PD including third molars was conducted at follow-up. At follow-up, PD > or =4 mm distal of second molars or around third molars was considered important clinically. RESULTS: Data from 237 patients were available. Median age was 25.9 years (interquartile range [IQ], 22.1 years, 32.8 years). With a median follow-up of 2.2 years (IQ, 2.0 years, 3.7 years), 44% of impacted maxillary third and 26% of impacted mandibular third molars changed angulation or position. One third of vertical/distal impacted third molars in both jaws and 11% mesial/horizontal mandibular third molars erupted to the occlusal plane during follow-up from baseline. If mandibular third molar angulation as compared with the long axis of the second molar was mesial/horizontal > or =35 degrees , only 3% erupted to the occlusal plane. At follow-up, 11% of the 125 impacted maxillary third and 29% of the 133 impacted mandibular third molars had PD > or =4 mm. Similarly, 11% of the 307 maxillary third molars at the occlusal plane had PD > or =4 mm, but 51% of the 312 erupted mandibular third molars were affected. CONCLUSION: A change in third molar position or angulation was common. Erupted mandibular third molars were more likely to have PD > or =4 mm.

Adolescent↗
PubMed1987

Dental anomalies in familial adenomatous polyposis coli.

Forty-seven Danish and 50 Finnish patients with familial adenomatous polyposis coli (FPC) were studied by panoramic tomography (PTG) of the mandible, which showed dental abnormalities in 17% of the cases. Eleven patients (11%) had supernumerary teeth and/or compound osteomas, and nine patients (9%) had impacted permanent teeth. The frequency of the dental anomalies was statistically significantly higher in FPC patients than in the normal population; it is therefore concluded that this dental abnormality should be included in the list of extracolonic manifestations that may occur in any FPC patient. The frequency of dental anomalies was higher in Finnish than in Danish patients, probably owing to a higher frequency of extracolonic manifestations in the Finnish series.

Adenomatous Polyposis Coli↗
PubMed1985

Supernumerary mandibular premolars: report of cases.

Six cases, totaling seven supernumerary mandibular premolars, were seen in a sample population of 4,000 patient records. Four were from a suburban private practice sample of 2,000, the others from a similar group randomly drawn from an urban dental school. Five of seven appeared on the left side, six of seven were impacted or erupted ectopically. Only one patient was female. Four were of Spanish or Hispanic descent, one was white and one was black. The only other supernumerary teeth seen in the population sampled were two paramolars and one mesiodens. The recommended course of treatment is extraction of the supernumerary teeth, unless they may be useful for orthodontic purposes or if the surgery would be unjustifiably hazardous to adjacent structures. Complications could result in resorption of other teeth, malocclusion, and possible cystic degeneration and ameloblastoma formation.

Adolescent↗
PubMed1991

[Alignment of malpositioned canines].

This article presents a system for aligning impacted canines. The base of this system is the lingual arch, a rigid reaction unit of four teeth, molars and premolars. From this base unit an impacted canine can be extruded, moved distally, jumped over the occlusion and derotated by segment arches, coil springs and elastic ligatures. The efficiency of this appliance is due to the elimination of undesired reactive forces, the safe moving of teeth, the possibility of an exact force application and the simple manipulation; also the esthetic inconvenience is minimal. All this results in a better prognosis and an essentially shorter treatment time. This appliance can be used in the upper and the lower jaw. Schematic drawings and clinical examples demonstrate this method.

Adolescent↗
PubMed1986

The effect of aging on tooth morphology: a study on impacted teeth.

The effect of age on dental tissues was studied on histologic sections of totally impacted teeth obtained from patients between 11 and 76 years of age. Impacted teeth were used in order to obviate the influence of the environmental effects prevalent in the oral cavity. The presence of concentric denticles and diffuse calcifications was determined, and the width of secondary dentin, predentin, and cementum was measured. The width of predentin and cementum increased linearly with age, whereas the aging process of secondary dentin formation and diffuse calcifications followed a different pattern. The incidence of concentric denticles was identical for all age groups.

Adolescent↗
PubMed1998

A case of supernumerary teeth in the premaxilla, maxillary cuspid, and mandibular premolar regions.

A case of several developing supernumerary teeth is reported. A seven-year-old African-American boy presented with retained primary maxillary central incisors, two impacted mesiodens, and unerupted permanent maxillary central incisors. A dentigerous cyst was removed at the time of surgical removal of the mesiodens. Approximately fourteen months post-extraction, a new panoramic radiograph showed the presence of six previously unidentified developing and unerupted supernumerary teeth, one on each of the maxillary cuspid areas and two on the mandibular premolar regions bilaterally. Practitioners should be aware that supernumerary teeth may develop late. Thus, periodic reevaluation with appropriate radiographs is indicated, especially in patients who have presented with supernumerary teeth.

Child, Preschool↗
PubMed1978

[Quantitative study of the mineral substance of the human dental cementum].

A study of the mineral substance of human dental cementum was made by various biophysical methods. In healthy teeth, average degree of mineralization of the cementum as well as crystallinity and fluoride content of its mineral substance, were found to increase as a function of age. This evolution, typical of the physiological ageing process of calcified tissues, is especially pronounced for the cementum, because of the absence of remodeling activity such as that occuring in bone tissue. Cementum of impacted or semi-impacted teeth was found to have a significantly lower degree of mineralization than that of sound teeth in occlusion. In periodontally diseased teeth, the increase in crystallinity and degree of mineralization of the cementum as a function of age is considerably greater than that observed in healthy teeth. These changes were found to affect the cervical cement first of all, and progressively, the entire tissue. No difference was observed, however, in the fluoride content of the cement of periodontally diseased teeth and healthy teeth of the same age.

Adult↗
PubMed1997

A device to predict lower third molar eruption.

This study was designed to create a transparent device to be superimposed on a panoramic tomogram taken of a patient at age 20 years to make predictions of future eruption or impaction of lower third molars. The device was developed from data on 40 lower third molars initially retained at age 20 years; one half of these remained impacted, and the other half of them erupted by age 26 years. Tracings were made from panoramic tomograms taken at age 20 years. The critical point for prediction in the overlay was the intersection of a horizontal reference line and the anterior border of the ascending ramus. To estimate this critical separation line, Bayes' Decision Theory was used. The sum of false negatives and false positives was least at a distance of 14.5 mm from the distal surface of the second molar. Mesial from this point, the probability of impaction was 76%; distal from this point, the probability of eruption was 72%. Tested against 35 initially unerupted lower third molars, the predictions made by the device and the actual clinical findings were in conformity in relation to 97% of the test teeth. It could thus be concluded that the method was simple to use and may prove a good addition for predicting lower third molar development.

Adult↗
PubMed1998

Simple X-ray film holder for lateral view of the anterior jaws using dental X-ray apparatus.

A new X-ray apparatus, the occlusal X-ray film holder, was devised so that the lateral view of the jaw could be studied. This apparatus could easily be adjusted to a dental X-ray cone. In 21 cases of impacted teeth, cysts or foreign body in the maxilla and mandible and 6 cases that necessitated examination before or after implantation, the efficacy of this apparatus was confirmed. Its advantages are: it is applicable to dental X-ray equipment; it is cheap; there is no need for image intensifying to get a clear image; and follow-up examination is possible. We believe that this film holder would be useful for the diagnosis of lesions in the anterior maxilla and mandible as well as in the general dental clinic.

Foreign Bodies↗
PubMed2006

Concomitant developmental dental anomalies in Chinese children with dens evaginatus.

AIM: To determine the prevalence of concomitant developmental dental anomalies in a group of Chinese children with dens evaginatus. METHODS: The dental records and orthopantomograms of 10-15 year old children and adolescents who had been diagnosed with dens evaginatus in a school dental clinic were reviewed retrospectively. RESULTS: Four hundred and forty-eight of 7102 (6.3%) children were found to have dens evaginatus. Concomitant developmental dental anomalies were found in 77 children (17.2%). The most commonly seen dental anomalies in the study population were hypodontia, hyperdontia, microdontic maxillary lateral incisor, and dental impaction. The prevalence of these anomalies did not differ significantly to that found in the general Chinese population. When analysed separately, however, the prevalence of supernumerary premolars was found to be higher in children with dens evaginatus than in the general population, and the difference was statistically significant (P < 0.01). CONCLUSION: Supernumerary premolars appeared to be more prevalent in Chinese children with dens evaginatus than in the general population. There may be an association of supernumerary premolars with dens evaginatus in this study population.

Adolescent↗
PubMed2006

Cleidocranial dysplasia: importance of radiographic images in diagnosis of the condition.

Cleidocranial dysplasia (CCD) is a rare syndrome usually caused by an autosomal dominant gene, although 40% of cases of CCD appear spontaneously with no apparent genetic cause. This condition is characterized by several cranial malformations and underdevelopment, absence of the clavicles, and multiple supernumerary and impacted permanent teeth. The diagnosis of this condition is usually based on the presence of the main features (supernumerary teeth, partial or total absence of one or both the clavicles, and bony malformations) and on clinical and familial evidence. The bony and dental features of CCD may be visualized on radiographic images of the face and skull. Here, we present a familial case of CCD and discuss the importance of dental radiographs in diagnosis of the condition.

Adolescent↗
PubMedDate not supplied

The likelihood of finding occult histopathology in routine third molar extractions.

Patients had their third molars extracted for reasons unrelated to concerns about the presence of pathologic entities. The preoperative differential diagnosis for a pericoronal radiolucent lesion was hyperplastic follicle, dentigerous cyst, odontogenic keratocyst, and remotely, ameloblastoma. The study involved 42 patients with 101 bony or soft tissue impacted teeth. The most significant microscopic histopathology observed was dentigerous cysts. Of the 101 teeth evaluated, 46 (45.5 percent) were dentigerous cysts. The male to female ratio was 1:1, and the average age was 23.3 years. Frequently, a pericoronal radiolucent width of 2.0 mm on the pantomograph is associated with the presence of microscopic histopathology. The range of widths of the radiolucency associated with the dentigerous cysts in the present was 0.1 to 3.0 mm with 33 (72 percent) displaying a radiolucent widths of 1.0 mm. In the present study, dentigerous cysts were frequently observed, and aggressive histopathologic entities were not identified.

Ameloblastoma↗
PubMed1992

Comparison of the safety and efficacy of a combination analgesic Myprodol and Ponstan in the treatment of dental pain.

A comparison of the efficacy of Myprodol, a combination analgesic (Ibuprofen, Paracetamol and Codeine phosphate) and Ponstan (Mefenamic acid) was undertaken in a randomised double blind trial of 52 patients who underwent surgical removal of impacted or unerupted teeth. Pain scores were measured for patients pre- and post operatively by means of a visual analogue scale and data was analysed using the BMPD package on the ISM main frame computer at the Medical Research Council. The results indicated that although Myprodol and Ponstan were equally adequate and well tolerated in the control of post operative dental pain, Myprodol exceeded Ponstan in duration of analgesia and in the degree of pain intensity control experienced by the patient.

Acetaminophen↗
PubMed1989

The unerupted or impacted third molar--a critical appraisal of its pathologic potential.

The prophylactic removal of asymptomatic unerupted or impacted third molars constitutes a major proportion of all oral surgical procedures. Patients are advised to have this preventive surgery on the basis that such teeth, if retained, are likely to cause certain pathologic lesions. The evidence in the scientific literature on the prevalence of dentigerous cysts, mural ameloblastoma, epidermoid carcinoma and root resorption indicates that this concern is exaggerated. The retrospective data on the reasons for extractions of third molars confirm this conclusion. Until there are prospective studies which demonstrate a significant patient benefit from surgery exceeding the risks of retention, the practice should be discontinued. Third molars should be removed only where there is a defined pathologic indication.

Dentigerous Cyst↗
PubMed1998

A study of sports-related mandibular angle fracture: relation to the position of the third molars.

Mandibular angle fractures have been considered attributable to the presence of unerupted third molars. We examined the relationship between the incidence of sports-related mandibular angle fractures and the presence of a mandibular third molar with emphasis on the position of the third molar. The incidence of angle fracture was significantly higher in the sports-related injury group than in the group with fracture due to other causes (P < 0.05). The incidence of angle fracture in the athletes with higher impaction scores was significantly higher than that in the subjects with higher scores who did not have sports-related fractures (P < 0.05). The percentage of rugby athletes with third molars was significantly higher than that of those without third molars (P < 0.001), and a high proportion of young athletes (89.5%) was considered to belong to a potential high-risk group for angle fractures. Our findings suggest that mandibular angle fractures are influenced by the presence and characteristics of the third molar in sports-related injuries.

Accidents, Traffic↗