The Journal of the Dental Association of Thailand最新文献

A clinico-radiologic-histologic review of fibrous dysplasia of the jaw in ninety-one Thai patients were studied. The lesions showed a slight predilection for females and for the maxilla. The mean age of patients was about 22 years. From available radiographic findings in 11 cases, 9 cases showed radiolucent lesions with ground glass appearance and 7 out of these cases had an ill defined border. Two out of 11 cases had mixed radiolucent radiopaque lesions and one of these had a well-defined border. Histologically, approximately half of the cases showed features of metaplastic woven bone in fibrous stroma. The peak incidences of woven bone and osteoid substance were between the ages of 11 and 20 years but for lamella bone only, the incidence was increased to the age of 31 and 40 years. The stromal component of each individual case showed variable amounts of fibroblasts, collagen fibers, vascularization and giant cells.

The effect of Hevac B vaccine was studied in 57 seronegative dental students. Vaccines were given three monthly injections and booster at a year. Sera were collected at month 1, 2, 4, 12 and 13. Anti-HBs seroconversion rate were 5.26 per cent, 43.86 per cent and 82.45 per cent after the first, second and third injections. At a year, the seroconversion rate was 89.47 per cent and increased to 100.00 per cent at one month after the booster dose. Geometric mean titer after three injections was 324 IU/L. After booster vaccination, geometric mean titer was 5321 IU/L in 44 students, and the other 13 students had titer greater than 18,000 IU/L. Anti-HBc were detected in one male and one female students who had no clinical symptom of hepatitis. The HBsAg could not be detected and the transaminase enzyme were in normal limit in all collected specimens.

In children, the nasopharyngeal airway space is provided by the size of adenoid tissue on the posterior nasopharyngeal wall and the size of nasopharynx. This airway space will be changed by the age. The objective of this study is for evaluating this airway space at the age group 7-8 years, 9-10 years, 11-12 years, 13-14 years and 15-16 years from the cephalograms by assessing is the form of adenoidal-nasopharyngeal ratio. Two hundred subjects (97 boys, 103 girls) were selected without histories of mouth breathing, or adenoidectomy or previous orthodontic treatment and cephalometrically, they are shown normal inclination of the maxilla and the mandible to cranial base, normal facial index and no anterior open-bite. They were divided into 40 subjects on each age group. From the study, the adenoidal-nasopharyngeal ratio were found 0.557, 0.487, 0.512, 0.470 and 0.415 at the age 7-8 years, 9-10 years, 11-12 years, 13-14 years and 15-16 years respectively.

A total of 190 randomly selected panoramic radiographs of teeth and Hand-Wrist radiographs of the patients at the Faculty of Dentistry, Mahidol University was studied with the age varied from 3-22 years, both sexes. Regression analysis showed that there was a high correlation between age with developmental stages of teeth and Hand-Wrist developmental stages. Estimation of age can be done through the equation, based on given scores of developmental stages of teeth and Hand-Wrist developmental stages... Correlation between Age and Developmental Stages of Permanent Teeth and Development Stages of Hand-Wrist Skeletal.

Cleft Lip and palate are most common congenital anomalies of the faces. Infants born with cleft lip and palate always have feeding problem. They were referred to dentists for obturators. Obturators usually have definite retention, lead to easily dislodgement. The author suggested the method of fabricating more retentive obturator.

Lower incisor extraction in orthodontic treatment was rare. Precise diagnosis and treatment planning should be done to achieve good occlusion and facial esthetics. Criteria for lower incisor extraction included degree of crowding, tooth size discrepancy, pathologic condition, vertical overbite, sagittal incisal relationship, skeletal growth pattern and age of the patient. This article comprised case reports of three Thai patients, all demonstrating the criteria for lower incisor extraction in orthodontic treatment. With comprehensive analysis, diagnosis and treatment planning, treatment results were satisfactory.

The assessment of the loss of camphorated monochlorophenol (CMCP) was conducted by means of the spectrophotometric technique. Extracted human single-rooted teeth were used in this study. The teeth were randomly divided into four groups with ten teeth in each group. Root canals were enlarged with reamers and files. 5.25 per cent sodium hypochlorite and 3 per cent hydrogen peroxide were used as irrigants. The root canals were dressed with 2 microliters of 40 per cent CMCP. The coronal and apical portions of the teeth in groups 1, 2 and 3 were sealed and incubated at 37 degrees C with 100 per cent relative humidity for 1, 3 and 7 days, respectively. In group 4 the teeth were treated in a procedure similar to that performed in group 1, except that the root apices were not sealed. The results showed that there was no significant difference in residual concentrations of CMCP among four groups (P greater than 0.05). The loss of CMCP in excess of 50 per cent was recorded in 1 day, with no further loss at longer time intervals.

The quantitation of salivary Streptococcus mutans (S. mutans) according to Köhler and Bratthall and the evaluation of oral hygiene index (OHI-S) by Greene and Vermillion were examined before and after oral preventive measures in 359 schoolchildren at 7-13 years old, sampled from primary schools in three Amphoes of Phetchabun. At the first examination, it was found that 93.9% of the total schoolchildren had S. mutans and most of them had less than 50 CFU. In addition, 11.4% of the samples had this microorganism more than 100 CFU (Comparable to 10(6) CFU/ml. of saliva) and regarded as a high caries risk group. The average values of OHI-S in different age groups of schoolchildren varied from 1.75 to 2.25 and only 15.9% was classified to be in the group of good oral hygiene (OHI-S,0-1.2). However no significant relationship was recorded between the number of S. mutans and the oral hygiene status (p greater than 0.05). The second examination indicated the improvement of oral hygiene status after preventive measures (p less than 0.05) but the number of S. mutans was not significantly changed (p greater than 0.05).

A review of 127 documented cases of necrotizing sialometaplasia is presented, mainly focusing on 96 palatal lesions. Necrotizing sialometaplasia is a benign, self limiting inflammatory lesion of the minor salivary glands. The cause is unknown but it may be related to oral trauma, tobacco use or inadequate blood supply. Male (mean age 49.8 yrs) to female (mean age: 36.3 yrs) ratio is 2.31:1. Because the clinical and histologic features mimic malignancy, proper diagnosis is of utmost importance in order to avoid unnecessary and extensive surgery and radiation therapy. The lesion heals spontaneously, regardless of therapy in two to eight weeks.

An interesting case of temporary ocular palsy, a complication of inferior dental nerve block was reported. Symptom, sign and proper management were described. Several updated literatures on this topic were reviewed and concluded that this complication might be explained by accidental intra-arterial injection of anesthetic solution. To prevent this serious complication, aspirating before each injection by an aspirated syringe was strongly recommended.