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At least 613 records · Page 34Linked to original sources
PubMed2004

Removal of partially erupted third molars using an Erbium (Er):YAG laser: a randomised controlled clinical trial.

We compared Erbium (Er):YAG laser with a surgical bur for removal of partially erupted lower third molars. Patients were randomised to be treated by either laser or bur. A total of 42 patients (laser = 22; bur = 20) were treated. A greater reduction in the range of mouth opening was found after laser than after bur treatment. Postoperative pain was more common after bur treatment. The duration of operation was considerably longer with laser than with bur. No persistent complications were encountered.

Adult↗
PubMed2005

Infected paradental cysts in children: a clinicopathological study of 15 cases.

We report the clinical, radiographic and histological features of 15 paradental cysts of the first and second molars and recommend conservative surgical treatment. Twelve young patients were operated on for 15 paradental cysts of the first and second molars, and had conservative operations with partial preservation of the mandibular cortical bone. After 2 years there had been no recurrences. The differential diagnosis of paradental cyst was fundamental to allow the correct treatment and the early diagnosis of lesions on the opposite side. The maintenance of periodontal hygiene in the immediate and late postoperative periods was an aid to ensure complete remission of the lesions.

Bacterial Infections↗
PubMed2005

Relationship between the risk of mandibular angle fractures and the status of incompletely erupted mandibular third molars.

BACKGROUND: Several studies have shown the increased risk of mandibular angle fractures associated with incompletely erupted mandibular third molars. But only a few reports analysed in detail the relationship of the status of eruption of this tooth and this type of fracture. OBJECTIVES: The purpose of this study was to clarify the influence of the eruption status of incompletely erupted mandibular third molars on the incidence of mandibular angle fractures. METHODS: Four hundred and thirty-six mandibular halves in 218 patients with mandibular fractures, aged between 15 and 40 years old, were analysed using panoramic radiographs. RESULTS: The incidence of angle fractures in the mandibular halves with incompletely erupted mandibular third molars was 30.8% and this was statistically significantly higher than that in another group (p<0.0001). Deeply located mandibular third molars clearly showed a higher incidence of this fracture when compared with the adjacent second molar (p<0.0001). CONCLUSION: The results of this investigation showed that incompletely erupted mandibular third molars close to the inferior border of the mandible have a high risk of angle fractures.

Adolescent↗
PubMed2005

Relationship between lower wisdom tooth position and cyst development, deep abscess formation and mandibular angle fracture.

AIM: There is an ongoing controversy about indications for prophylactic removal of third molars. The purpose of this retrospective study was to clarify the risk of preservation of lower third molars. MATERIAL AND METHOD: In a 5-year period, 316 patients were registered who had received in-patient treatment for deep abscess formation, cyst formation or mandibular angle fracture in relation to lower third molars. A radiological analysis (panoramic radiographs) was performed to determine whether major pathological changes associated with lower wisdom teeth are related to their position. Third molar positions were studied in this in-patient group and in an out-patient group. The latter consisted of 300 consecutive patients with prophylactically removed impacted third molars without any pathology. The relationship between the positions and the different pathological changes associated with impacted lower wisdom teeth was analysed statistically using a new 'position score'. RESULTS: The study revealed that the highest 'position scores' corresponding to a leading aberrant position correlated significantly with cyst formation. Lower scores corresponding to moderately aberrant or slightly irregular position were found with angle fractures, abscess formation, and in the control group as a whole. CONCLUSION: This study indicates that prophylactic third molar surgery for teeth with high and strongly elevated 'position scores' is appropriate in order to prevent cyst formation or mandibular angle fractures in a population at risk for facial trauma. In addition to other factors, 'position score' data could be useful for development of a model for predicting severe complications related to (removal of) impacted lower wisdom teeth.

Abscess↗
PubMed2007

Delayed-onset infections after lower third molar extraction: a case-control study.

PURPOSE: To identify possible risk factors for delayed-onset infections and to develop a model for explaining the effects of these risk factors on the occurrence of delayed-onset infections in an outpatient clinic. MATERIALS AND METHODS: A retrospective case-control study comprising a total of 178 lower third molar extractions performed between 2001 and 2004 in the Oral Surgery and Orofacial Implantology Department of the School of Dentistry of the University of Barcelona, Spain. RESULTS: Bivariate analysis showed tooth sectioning, soft tissue and bone retention, and the position of the lower third molar (according to the classifications of Pell and Gregory, and of Winter) to be significantly associated with the development of delayed-onset infections. A logistic regression model included the following independent variables: position of the lower third molar according to Winter, and Pell and Gregory Classes I, II, and III, and degree of soft tissue retention. CONCLUSIONS: Lower third molars with total soft tissue retention, a lack of distal space and with a vertical or mesioangular tilt are more likely to develop delayed-onset infections. Tooth sectioning, bone retention, and depth of inclusion could also be risk factors for such infections. Heavy smokers seem to be more prone to this complication.

Adult↗
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↗
PubMed2006

Osteomyelitis with proliferative periostitis: an unusual case.

Chronic osteomyelitis with subperiosteal new bone formation results from periosteal reaction to chronic inflammatory/infectious stimulation. In the maxillofacial region, it has traditionally been termed Garrè's osteomyelitis with proliferative periostitis and more recently periostitis ossificans. The term Garrè's osteomyelitis has been regarded as a misnomer by many authors in the recent literature. The term chronic osteomyelitis with proliferative periostitis, although cumbersome, is considered to be the most accurate description of the pathology. It usually affects the mandible of young patients secondary to dental infection. Management involves removal of the source of infection and antibiotic treatment. We present an unusual case of chronic osteomyelitis with proliferative periostitis affecting the mandible of a 12-year-old patient. The source of infection was related to the developing lower left third molar, which had apparently no communication with the oral cavity.

Child↗
PubMed2001

Characterization of alpha-smooth muscle actin positive cells in mineralized human dental pulp cultures.

In response to injury, pulp precursor cells can differentiate into odontoblast-like cells that produce reparative dentine. In culture, pulp cells form mineralizing nodules, but the characteristics of the cells involved in this process are still not fully known. Human pulp cells for culture were obtained from coronal pulp isolated from non-erupted molars, and were maintained in RPMI 1640 medium supplemented with fetal calf serum. Nodules were forming in all human pulp primary cultures (HPPc) and human pulp subcultures observed until their fifth passage (HPSc<5). Mineralization of the nodules was confirmed by the presence of calcium and phosphate that were quantified by X-ray microanalysis. Specific immunolabeling revealed alpha-smooth muscle actin and vimentin in both HPPc and HPSc<5 cells. Cells positive for alpha-smooth muscle actin were either isolated or gathered together in the nodules. Under transmission electron microscopy, some cells in primary pulp cultures exhibited features typical of myofibroblasts or pericytes, such as stress fibers, fibronexus, indented nuclei and gap-junctions. These cells were frequently in close contact with mineral deposits. This work demonstrates for the first time the presence of pericytes or myofibroblasts in mineralized human pulp cultures, but further investigation is required to determine their origin, role and degree of differentiation.

Actins↗
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↗
PubMed1998

Forced eruption technique: rationale and clinical report.

This article describes a refined, simplified forced eruption technique, and compared it with previous methods. This simplified method is easy to perform and encourages the use of adjunctive orthodontics in general practice. This relatively uncomplicated, quick, and cost-effective treatment can benefit patients.

Adult↗