Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Tooth, Impacted”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 937 records · Page 52Linked to original sources
PubMed1999

Eruption disturbances of the first and second permanent molars: results of treatment in 43 cases.

Impaction or retention of first and second permanent molars is an uncommon condition with diverse therapeutic approaches. To ascertain the success rate of different treatment possibilities, a retrospective study was made of 25 patients with a total of 43 permanent molars with eruption disturbances. In most cases, the nonerupted teeth were mandibular second molars (65%), followed by maxillary second molars (21%). Their position, degree of impaction (inclusion), clinical features, repercussion on the neighboring teeth, type of treatment, and outcome were evaluated. Infraocclusion was often associated with malposition of neighboring teeth, as well as extrusion and infraocclusion of opposing teeth. Due mostly to a delay in the diagnosis of the condition, an acceptable final position of the nonerupted molar was obtained in only 8 of 13 conservatively treated second molars. In order to prevent this situation, radiographic examination (ideally during the early mixed dentition period) and early diagnosis of eruption disturbances of permanent first and second molars are recommended, particularly when considering that these anomalies are associated with a high rate of occlusal disturbances that may require orthodontic correction.

Adolescent↗
PubMed2003

Changes in TrkB-like immunoreactivity in rat trigeminal ganglion after tooth injury.

The purpose of this study was to characterize the impact of tooth injury on the distribution of tyrosine receptor kinase B (TrkB) among trigeminal ganglion neurons and assess the time course for tooth injury-induced TrkB distribution changes. In addition, we sought to further characterize the subpopulation of the afferents expressing TrkB receptors. Fifteen adult male Sprague-Dawley rats were studied. Pulpal inflammation was induced and ganglia were subsequently harvested and processed at different time points. Standard immunohistochemical fluorescence techniques were used to visualize TrkB-like immunoreactivity and isolectin B4 binding. Results indicate that full-length TrkB receptors are present in 36.6% of trigeminal ganglion neurons. This percentage decreases for the first 48 h and then increases to 41% by 7 days after tooth injury. Finally, TrkB appears to be present in a large percentage (54%) of isolectin B4+ neurons, suggesting that it is present in nociceptive afferents. These data highlight the fact that even mild injury results in sustained changes in nociceptive circuitry and raise the possibility that the brain-derived neurotrophic factor/TrkB system may contribute to persistent pain after tooth repair.

Animals↗
PubMed1990

[The long-term clinical follow-up of a group of patients subjected to surgical intervention for the extraction of supernumerary impacted teeth].

A long-term clinical control carried out on 34 patients subjected to surgery for the removal of included extra teeth at the Odontostomatological Clinic of the University of Turin is reported. The patients had mostly been treated at ages between 7 and 12 followed up between 4 and 8 years later. Long-term damage, from an orthodontic viewpoint also, is not frequent and when present is not of particular importance. The operation, carried out early and with correct technique, does not cause particular damage to teeth or adjacent bone or nerve structures and does not create psychological traumas for the young patient. It is therefore advisable for the surgical removal of extra included teeth which are causing damage to adjacent structures to be programmed as early as possible so as to permit maximum functional and aesthetic recovery and to minimise to the utmost the consequences of the operation.

Child↗
PubMed1997

The effects of immunoglobulins on the convective permeability of human dentine in vitro.

Immunoglobulin molecules are localized in the dentinal tubules of non-carious and carious teeth, but their possible role in caries invasion is not understood. This study sought to examine the effects of immunoglobulin molecules on dentine permeability using a fluid-filtration method. Crown segments cut from impacted human third molars were treated by filtration with 100 micrograms/ml IgG, 100 micrograms/ml IgA or 30 micrograms/ml IgM under a constant pressure. Flow rates were recorded and percent changes in flow rate analysed over time. Filtrates collected at various times were tested for changes in immunoglobulin concentrations by an enzyme-linked immunosorbent assay, and the percent retention of immunoglobulins to dentine was calculated. There was a decreasing non-linear exponential relation between the percent changes in flow rate and filtration time for all three immunoglobulins. The percentage of retained immunoglobulins was significantly related to the filtration time for all three classes of immunoglobulins. Immunoglobulin retention contributed to significant changes in flow rate with time. These in vitro results indicate the potential mechanism of immunoglobulins in decreasing tabular permeability.

Dental Caries↗
PubMed1997

Mandibular third molars as mediated by three cues. Dentists' treatment decisions on asymptomatic molars compared with molars associated with pathologic conditions.

The aim was to study how three cues (patient's age and angular position and degree of impaction of the molar) were distributed among removed mandibular third molars associated with pathologic conditions and to compare these results with dentists' treatment decisions in another group of molars consisting of asymptomatic mandibular third molars, as mediated by the same cues. The overall agreement was fairly high between the dentists' treatment decisions and the removal rate among the molars subjected to removal. Thus, molars partially covered by soft tissue in patients aged 19 to 40 years had a high removal rate, and molars totally covered by bone tissue had the lowest removal rate in accordance with the dentists' treatment decisions. There were some exceptions. For example, molars partially covered by soft tissue in horizontal and mesioangular positions were rated higher by the dentists than the removal rates indicated. Distoangular molars in patients aged 26 to 40 years had the highest removal rate but a considerably lower order according to the dentists' decisions. Scientific evidence indicates that molars in mesioangular and horizontal positions present a low risk and molars in distoangular position present the highest risk of developing pathologic conditions, compared with other angular positions.

Adult↗
PubMed1998

Accuracy of radiographic detection of residual caries in connection with tunnel restorations.

The aim of this study was to evaluate the diagnostic accuracy of radiographic examination for the detection of residual caries after tunnel preparation and filling with glass ionomer cement. Further, two different radiographic modalities were compared. Forty-five extracted human premolars and molars with clinical signs of approximal caries were selected for the study. The teeth were radiographed in order to identify surfaces with dentinal lesions suitable for tunnel preparation. Seventeen of the teeth had lesions that were as a minimum through the enamel and as a maximum into the outer half of the dentin (14 teeth = 1 lesion, 3 teeth = 2 lesions). Seventeen surgically removed third molars were thereafter included. These teeth were sound with respect to caries. The teeth were arranged in blocks with approximal contacts and radiographed using two image receptors: Ektaspeed Plus film (E) and the Digora (D) digital storage phosphor plate system. The 20 carious surfaces and 20 surfaces of the impacted teeth were prepared following the guidelines for the class II tunnel technique and filled with glass ionomer cement. The radiographic examination was repeated with both modalities after filling, and the approximal surfaces scored on the radiographs by 5 observers using the criteria: 0 = no filling, 1 = filling with residual caries, 2 = filling with no adjacent caries. All teeth except the unerupted third molars were sectioned, and the sections examined under the microscope. Residual caries was observed in 8 surfaces. On average, sensitivity was 0.25 for E and 0.32 for D, specificity 0.83 for E and 0.76 for D, positive predictive value 0.38 for E and 0.32 for D, and negative predictive value 0.75 for E and 0.77 for D. The differences between the two modalities were not statistically significant (p > 0.3). Based on the relatively small number of lesions in this study, it is suggested that radiography immediately after tunnel restoration cannot be recommended, as the diagnostic benefit from this examination seems to be minuscule.

Bicuspid↗
PubMed2004

Effectiveness of strategies to disseminate and implement clinical guidelines for the management of impacted and unerupted third molars in primary dental care, a cluster randomised controlled trial.

OBJECTIVE: To investigate the effectiveness and cost-effectiveness of different guideline implementation strategies, using the Scottish Intercollegiate Guidelines Network (SIGN) Guideline 42 "Management of unerupted and impacted third molar teeth" (published 2000) as a model. DESIGN: A pragmatic, cluster RCT (2x2 factorial design). SUBJECTS: Sixty-three dental practices across Scotland. Clinical records of all 16-24-year-old patients over two, four-month periods in 1999 (pre-intervention) and 2000 (post-intervention) were searched by a clinical researcher blind to the intervention group. Data were also gathered on the costs of the interventions. INTERVENTIONS: Group 1 received a copy of SIGN 42 Guideline and had an opportunity to attend a postgraduate education course (PGEC). In addition to this, group 2 received audit and feedback (A and F). Group 3 received a computer aided learning (CAL) package. Group 4 received A and F and CAL. PRINCIPAL OUTCOME MEASUREMENT: The proportion of patients whose treatment complied with the guideline. RESULTS: The weighted t-test for A and F versus no A and F (P=0.62) and CAL versus no CAL (P=0.76) were not statistically significant. Given the effectiveness results (no difference) the cost effectiveness calculation became a cost-minimisation calculation. The minimum cost intervention in the trial consisted of providing general dental practitioners (GDPs) with guidelines and the option of attending PGEC courses. Routine data which subsequently became available showed a Scotland-wide fall in extractions prior to data collection. CONCLUSION: In an environment in which pre-intervention compliance was unexpectedly high, neither CAL nor A and F increased the dentists' compliance with the SIGN guideline compared with mailing of the guideline and the opportunity to attend a postgraduate course. The cost of the CAL arm of the trial was greater than the A and F arm. Further work is required to understand dental professionals' behaviour in response to guideline implementation strategies.

Adolescent↗
PubMed2000

The effectiveness and cost-effectiveness of prophylactic removal of wisdom teeth.

BACKGROUND: Removal of wisdom teeth is one of the most common surgical procedures performed in the UK. Little controversy surrounds the removal of impacted third molars when they are associated with pathological changes such as infection, non-restorable carious lesions, cysts, tumours, and destruction of adjacent teeth and bone. However, the justification for prophylactic removal of impacted third molars is less certain and has been debated for many years. OBJECTIVES: To provide a summary of existing evidence on prophylactic removal of impacted wisdom teeth, in terms of the incidence of surgical complications associated with prophylactic removal, and the morbidity associated with retention. METHODS: A systematic review of the research literature was undertaken. METHODS - DATA SOURCES: An existing review formed the basis of this report, and additional literature searches were undertaken, including searches of electronic databases (MEDLINE, 1984-99; EMBASE, 1984-99; Science Citation Index, Cochrane Controlled Trials Register, National Research Register; Database of Abstracts of Reviews of Effectiveness), paper sources (including Clinical Evidence), and web-based resources. Relevant organisations and professional bodies were contacted for further information. METHODS - STUDY SELECTION: Studies were selected for inclusion if they met the following criteria: (1) design - randomised controlled trials (RCTs), literature reviews, or decision analyses; (2) participants - people with unerupted or impacted third molars, or those undergoing surgical removal of third molars either as prophylaxis or due to associated pathological changes; (3) reported outcomes - either the pathological changes associated with retention of third molars, or post-operative complications following extraction. There were no language restrictions on study selection. METHODS - DATA EXTRACTION AND SYNTHESIS: Data from included studies were extracted into structured tables and individual study validity was assessed against methodological checklists. Data were summarised descriptively. Decisions relating to study selection, data extraction and validity assessment were made by two independent reviewers, and disagreements were resolved by discussion. For non-English papers, translators were recruited to assist with study selection and data extraction. RESULTS: Forty studies were included in the review: two RCTs, 34 literature reviews, and four decision analysis studies. One RCT in the UK focused on the effects of retained third molars on incisor crowding (predominantly a cosmetic problem) in patients who had previously undergone orthodontic treatment. The results of this trial suggested that the removal of third molars to prevent late incisor crowding cannot be justified. Another on-going RCT in Denmark compares the effects and costs of prophylactic removal of third molars with removal according to morbidity. So far, this trial has recruited 200 participants, and preliminary results indicate that watchful waiting may be a promising strategy. However, more data and longer follow-up of patients are needed to conclude which treatment strategy is the most cost-effective. It is also known that a trial is on-going in the USA but no results are available so far. The methodological quality of the literature reviews was generally poor, and none of the reviews was systematic. Conclusions from nine reviews on anterior crowding suggested that there was only a weak association between retention of third molars and crowding. Six out of 21 reviews with a more general scope also concluded that the prophylactic removal of third molars was unjustified. Twelve general reviews did not conclude with a clear message about the management of third molars. Three reviews suggested that prophylactic removal of third molars is appropriate, but these reviews were of poorer methodological quality than the majority of other reviews. Three out of four papers focusing on surgical management expressed

Cost-Benefit Analysis↗
PubMedDate not supplied

The impact of race on tooth formation.

The subjects consisted of 650 children (American white 245, Chinese 202, Japanese 203) from five to twelve years old, who came to the Department of Growth & Development, University of California, San Francisco. Mandibular first molar development was determined by inspecting panoramic radiographs and assigning a rating according to Kullman's method, which classifies tooth formation into seven stages according to growth and development. The samples in each age-stage were evaluated by their means values. Tooth formation was significantly more advanced in the American white children than in the Chinese or Japanese at all stages. The significance of the difference between Chinese and Japanese children was not identified. Tooth formation was shown to be highly correlated with chronological age, with a coefficient of more than 0.7 in all racial groups.

Age Determination by Teeth↗
PubMed1986

The incidence of impacted wisdom teeth in a Saudi community.

The wisdom tooth is the last permanent tooth to erupt into the oral cavity. Its eruption, however, can be impeded and the tooth may become impacted. The incidence of such a condition may be influenced by local as well as racial factors. In this article, an attempt was made to establish the incidence of impacted wisdom teeth in a small sample of the Saudi population.

Adult↗