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At least 253 records · Page 14Linked to original sources
PubMed1987

Autotransplantation of teeth (I). Indications for transplantation with a follow-up of 51 cases.

The indications for autotransplantation of teeth in 45 patients have been analysed together with a follow-up of the success rate of surgery. Most of the transplants were mature teeth, 37 out of 51, with closed apex. The majority of transplantations were carried out in order to replace single tooth losses (40) but in 11 cases, the teeth were used as an abutment in prosthetic rehabilitation. In 14 cases, an impacted tooth was transplanted to its normal position. The follow-up ranged from 3 months up to 10 years. No progressive root resorption has been observed so far; only 6 cases with slight surface resorption. Clinical signs of anchylosis were noticed in 4 teeth and shallow bone defects in 6 patients. Small- or medium-sized periapical destructions were observed in 4 cases. Mature transplanted teeth were always subjected to endodontic therapy within a month; the immobilisation varied between 2-4 weeks, while trying to keep it as short as possible with maintained stability. The experiences so far achieved do encourage a more comprehensive use of the method to solve problems associated with oral rehabilitation, from both prosthodontic and orthodontic points of view.

Adolescent↗
PubMed1987

Tooth loss among Nigerians: causes and pattern of mortality.

A study was carried out to elucidate the causes and pattern of loss of permanent teeth among Nigerians. A total of 3,163 dental extractions were carried out on 2,100 patients thus giving a ratio of 1.5 extractions per patient. The investigation revealed two major causes of tooth loss, i.e. periodontal disease (46.4%) and dental caries (43.9%). Other important aetiologic factors were trauma (4.5%), tooth impaction (2.4%) and orthodontic problem (1.6%). There was evidence to confirm fears by previous researchers that dental caries as a major cause of tooth mortality was increasing fast and could soon become the most important cause of tooth loss if not controlled. The study further showed that tooth mortality among Nigerians could be minimized if appropriate steps were taken immediately to control periodontal disease and dental caries, both of which constitute approximately 90% of all the causes of tooth loss.

Adolescent↗
PubMedDate not supplied

Premature eruption of the premolars.

This paper presents a variety of cases in which very early loss of abscessed primary molars caused early eruption of the permanent successors. Clinical sequelae including ectopic eruption, alteration of eruption sequence, arch-length inadequacy and tooth impaction are illustrated by five case reports.

Bicuspid↗
PubMed1994

Maternal smoking and tooth formation in the foetus. II. Tooth crown size in the permanent dentition.

Altogether 2159 pregnancies among black and white Americans in the Collaborative Perinatal Study and dental casts from their children at the age of 6-12 years were studied to determine the effect of maternal smoking on permanent tooth crown dimensions. A trend of reduction, similar to that observed in the deciduous second molars, was found in the permanent first molars and also in the mesio-distal dimension of permanent incisors in relation to sex and race of the children and smoking habits of the mother. In terms of peak in their mitotic growth, the results can be interpreted to indicate a sensitive period of intra uterine development from the 24th to 28th gestational weeks. Comparisons of postnatal body size and differential correlation patterns in affected tooth dimensions with early postnatal body and head size between smokers and non-smokers, suggests that maternal smoking during pregnancy may have an effect on basic growth of the head and body and/or the developmental process that impacts tooth development at some specific sensitive period also during the postnatal formation of these tooth crowns.

Birth Weight↗
PubMed1980

The delay time of tooth vibration signal recorded at facial skin surface.

The onset of a tooth vibration signal with a mini acceleration pickup attached to the skin on the forehead was delayed by 0.1788 ms on average after the actual tooth impact. When the signal was recorded at the zygomatic arch, the delay time was 0.1008 ms on average, which was significantly shorter than that obtained from the forehead (P less than 0.001). The difference due to a transposition of the vibrated tooth was also smaller (0.025 less than P less than 0.05) and had almost no effect on the intensities of the tooth flipping force. The delay time was even more prolonged when a poor frequency specification pickup and/or low pass filter were applied.

Adult↗
PubMed2000

Diagnostic imaging with newly developed ortho cubic super-high resolution computed tomography (Ortho-CT).

OBJECTIVE: Ortho cubic super-high resolution computed tomography (Ortho-CT), which we have developed, is characterized by the small size of the unit and the ability to produce 3-dimensional images of high resolution with low-radiation doses. The purpose of this study was to investigate the clinical usefulness of Ortho-CT for the diagnosis of diseases in the oral and maxillofacial region. STUDY DESIGN: Ortho-CT has been used for the imaging diagnosis of a radicular cyst of the upper first molar, mesiodense, tooth fractures in the upper anterior region, a fracture of the condylar process, or presurgical evaluation for a dental implant. The usefulness of 3-dimensional images obtained by Ortho-CT was investigated in this study. RESULTS: Ortho-CT produced images of high resolution, enabling identification of the extent of the lesions and the fracture line, the condition of the impacted tooth, and the relationship with the maxillary sinus, mandibular canal, and adjacent teeth. CONCLUSION: Because Ortho-CT can take high-resolution 3-dimensional images at any tomographic layer with only 1 exposure, it is useful for the diagnosis of diseases in the oral and maxillofacial region.

Adult↗
PubMed1997

Guidelines on the use of space maintainers following premature loss of primary teeth.

OBJECTIVE: To formulate evidence-based guidelines on the appropriate use of space maintaining appliances to prevent or reduce the severity of malocclusion in the permanent dentition following the premature loss of primary teeth. OPTIONS: Placement of lingual arch, palatal arch, band-loop, crown-loop, and intra-alveolar space maintainers. OUTCOMES: Reduced prevalence or severity of space loss in the primary or mixed dentition, reduced prevalence or severity of malocclusion in the permanent dentition measured as significant changes in: crowding, ectopic eruption, impacted teeth, Angle's class II or III occlusion, crossbite, deep overbite, deep overjet, or midline shift. EVIDENCE: Articles published from 1966 to 1996, located though Medline searches. Only clinical trials, cohort studies, case-control studies, or large case series were considered. VALUES: Relevant clinical findings were evaluated and categorized using evidence-based methods and values established by the Canadian Task Force on the Periodic Health Examination. A recommendation was developed for the use of space maintainers. BENEFITS, HARMS AND COSTS: The potential benefits of using space maintaining appliances include reduced prevalence or severity of: crowding, ectopic eruption, tooth impaction, crossbite, excessive overbite and overjet, and poor molar relationship. Other advantages include the potential for considerable cost savings by reducing the need for future orthodontic treatment. The potential disadvantages of using space maintaining appliances include soft tissue impingement, interference with eruption of adjacent teeth, pain, plaque accumulation, caries, and broken, dislodged or lost appliances. RECOMMENDATIONS: There is poor evidence to recommend for or against the use of space maintainers to prevent or reduce the severity of malocclusion in the permanent dentition (see Table 1, Recommendation C) Decisions regarding the use of space maintainers must therefore be guided by factors other than scientific evidence.

Humans↗
PubMed2006

The role of erosion, abrasion and attrition in tooth wear.

There is increasing clinical awareness of erosion of enamel and dentine by dietary acids and the consequent increased susceptibility to physical wear. Enamel erosion is characterized by acid-mediated surface softening that, if unchecked, will progress to irreversible loss of surface tissue, potentially exposing the underlying dentine. In comparison, dentine erosion is less well understood as the composition and microstructure are more heterogeneous. Factors which affect the erosive potential of a solution include pH, titratable acidity, common ion concentrations, and frequency and method of exposure. Abrasion and attrition are sources of physical wear and are commonly associated with tooth brushing and tooth-to-tooth contact, respectively. A combination of erosion and abrasion or attrition exacerbates wear; however, further research is required to understand the role of fluoride in protecting mineralized tissues from such processes. Abrasive wear may be seen in a wide range of patients, whereas attritive loss is usually seen in individuals with bruxism. Wear processes are implicated in the development of dentine hypersensitivity. Saliva confers the major protective function against wear due to its role in pellicle formation, buffering, acid clearance, and hard tissue remineralization. This review focuses on the physiochemical factors impacting tooth wear.

Dental Enamel↗
PubMed1999

Clinical problems associated with unusual cases of talon cusp.

CASE REPORT: Talon cusp is an uncommon dental anomaly manifested as an accessory cusp-like structure on the crown of anterior teeth. This report describes two unusual cases of talon cusp. Case 1 showed bilateral anomalous cusps on the palatal aspects of maxillary supernumerary teeth, causing premature contact and tooth impaction. In case 2, a double-fused talon cusp was projected from the palatal surface of a large geminated central incisor. A talon cusp is not an innocuous defect, as it may provide a substantial diagnostic, treatment planning and procedural challenge. Early diagnosis and management are important to avoid complications.

Adolescent↗
PubMedDate not supplied

Perinephric abscess: an unusual late infectious complication of renal biopsy.

Perinephric hematomas are common after percutaneous needle biopsy of the kidney and are usually clinically occult. Infectious complications in the absence of concomitant urinary tract infection, however, are unusual. A patient is reported who developed perinephric abscess (Streptococcus pneumoniae) at the site of a renal biopsy performed five years earlier. Wisdom tooth impaction and extraction occurred shortly after the biopsy. It is speculated that bacteremia of dental origin plus immunosuppressive therapy acted adjunctively to produce localization of infection in an area of previous trauma. Elective procedures that may induce transient bacteremia after percutaneous kidney biopsy may be hazardous and are best avoided. Antibiotic prophylaxis for such procedures should be considered.

Abscess↗
PubMed1999

Spontaneous uprighting of permanent tooth germs after elimination of local eruption obstacles.

Four clinical cases are presented to demonstrate the self-correcting potential of aberrant tooth germs after the elimination of eruption obstacles (in 2 cases cysts, in 2 other cases severely infraoccluded primary teeth). In the case of the submerging deciduous teeth, the tilted adjacent teeth were orthodontically uprighted after the surgical procedure. Possible causative mechanisms are discussed.

Bicuspid↗