The Journal of the Dental Association of Thailand最新文献

An unusual case of gigantic giant cell fibroma was reported and included in the series of 3 cases seen at Department of Oral Pathology, Faculty of Dentistry, Chulalongkorn University, during the past 14 and a half years since this particular lesion was first described in 1974. These 3 cases, representing 0.5% of all fibrous lesions, were presented and discussed according to their distribution, location, sex, incidence, clinical and histologic appearance in reference to the literature. This article also discussed the importance of biopsy and recommended that it should be routinely done to obtain a definite diagnosis of the lesion.

Hepatitis B infection is the most important infectious occupational hazard in the dental profession. Hepatitis B virus (HBV) is its etiology and can be transmitted by blood. Dentists were in a high risk of contracting this disease due to the procedures and instruments of dental treatment 1% of dentists were found to be carriers of HBs Ag whereas 13.6% demonstrated the presence of anti-HBs. In intraorally, the greatest concentration of hepatitis B infection was at the gingival sulcus. The role of saliva in transmission was not documented. Vaccination and practical infection control in the operatory could prevent transmission of infection from the patients to dentists or to the other patients.

A prospective study of mandibular third molar wisdom teeth including the type, age groups, presurgical and post surgical problem of the 175 Thai patients (184 teeth) was analysed. The patients were male 54.86% female 45.17%. The youngest patient was 16 years old and the oldest patient was 56 years old. The age group 16-24 years was found largest (48.57%). The mesioangular impaction was found 62.5%, vertical impaction 18.47, horizontal impaction 17.39% disto-angular impaction 1.09%, buccolingual impaction 0.54% respectively. The presurgical symptoms were pain, headache, joint pain, mastoid pain, infection, food impaction and orthodontic need. The postsurgical complication rate overall 6.86% that include dry socket 2.86%, bleeding 2.29% and infection 1.14%, dysesthesia 0.57%.

As dentists and their assistants are usually exposed to mercury in their clinical practices. The objective was to investigate the mercury level in these dental personnel. Urine and head hair samples were collected from 201 dental personnel and 57 unexposed controls for mercury analysis. The mercury content was analyzed by using cold vapour atomic absorption spectrophotometry. The results showed that mercury levels in the urine and head hair of dental personnel were significantly higher than in the controls (P less than 0.01). The urine mercury concentration of the unexposed controls ranged from 0.1-10.0 micrograms/l (means = 2.6 +/- 0.29 micrograms/l). The highest urine mercury level was found in the group of dental assistant (means = 17.1 +/- 2.44 micrograms/l). The mean urine mercury levels found in dentists, dental students and dental technicians were 10.1 +/- 1.42, 11.1 +/- 1.69 and 3.2 +/- 0.69 micrograms/l respectively. The amounts of urine mercury from dental assistants, dentists and dental students were 81.0%, 38.2% and 43.5% higher than the threshold limit value respectively. The mean head hair mercury concentration of unexposed controls ranged from 0.3-12.2 micrograms/g (means = 2.8 +/- 0.36 micrograms/g). The highest head hair mercury concentration was found in the group of dental assistant and 6th year dental students (means = 10.1 +/- 0.84 and 10.5 +/- 3.2 micrograms/g). The mean head hair mercury levels found in dental assistants, dentists, dental students and dental technicians were 10.1 +/- 0.84, 7.5 +/- 1.2, 6.5 +/- 1.54 and 2.8 +/- 0.53 micrograms/g respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

This clinical and laboratory study was to compare the antimicrobial effects of camphorated monoparachlorophenol, Cresophene and formocresol. Root canals of anterior teeth with 3-5 mm. rarefied area were instrumented and irrigated until they were ready to be filled. The patients returned every 7 days. Intracanal medicaments were changed until negative culture was obtained. The number of visits was recorded. The comparative effectiveness of the three medicaments were analysed. Results showed no statistical differences of the three medicaments (p greater than 0.1). The antimicrobial activity against bacteria from positive root canal culture of these three antiseptics were assayed by disc diffusion method. The inhibition zone of camphorated mono-parachlorophenol and Cresophene were nearly the same size, but that of formocresol had greater diameter. Using Gram's staining procedure, the majority of bacteria obtained from root canals was identified as gram positive cocci (94.74%).