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ABSTRACT: This paper reports a case of adenomatoid hyperplasia of minor salivary glands in the retromolar area, with a unique symptom of painful swelling. This appears to be the first reported case in the Chinese population. It would be useful for clinical dentists to be aware of this tumour.
Australian Dental Journal 07/1999; 44(2):135-6. · 1.19 Impact Factor
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Journal of Oral and Maxillofacial Surgery 04/1998; 56(3):379-82. · 1.64 Impact Factor
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ABSTRACT: The main purpose of this study is to find out the degree of attenuation when the x-ray entrances the skin and reaches the film at the bone area near the mandibular premolar root apex. In this study we used thermaluminescent dosimeters (TLDs) to measure the entrance dose and exit dose directly at the area of interest and calculated the penetration value P. We also simulated the attenuation process and calculated the P value in similar conditions. The results indicate that the mean P value of direct measurement from patient is 0.071 +/- 0.018 (60kVp, HVL = 1.5mm Al), while that for theoretical calculation is 0.06458 at 27keV. We concluded that P value of direct measurement can match with the theoretical value and further studies in jaw bone density and other related portions is worthwhile.
The Kaohsiung journal of medical sciences 11/1997; 13(10):631-4. · 0.61 Impact Factor
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ABSTRACT: The linear attenuation coefficient (mu) is an important coefficient in the study of diagnostic radiology. The mu values of dentin and enamel were rarely reported because they are thin and tightly connected to each other and are difficult to measure by thermoluminescent dosimeters or ion chambers. In this work, we used film densitometry to measure the radiation dose before and after they transmitted the 2 mm thickness tooth slice and used this data to calculate the mu values of enamel and dentin. The results show that the mu values of enamel at 70, 80, 90kVp are 2.97 +/- 0.71, 2.85 +/- 0.07, 2.70 +/- 0.16 cm-1, respectively. The mu values of dentin at 70, 80, 90kVp are 2.12 +/- 0.92, 1.81 +/- 0.23, 1.89 +/- 0.42 cm-1, respectively. The mu values may be affected by the equivalent energy of an x-ray generator operated under different kVp conditions and also by the density and calcification degree of the enamel and dentin. Nevertheless, the results obtained in this study still can severe as a reference for researchers.
The Kaohsiung journal of medical sciences 10/1996; 12(9):522-8. · 0.61 Impact Factor
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ABSTRACT: To measure the absorbed dose and evaluate the radiation risk of patient from full mouth series intraoral dental radiography, we used the LiF thermoluminescent dosimeters (TLD-100 chips) to detect the radiation dose of patients and RT-HUMANOID phantom as well. We also used water phantom and extracted human teeth to simulate the oral cavity and measure the absorbed dose of tooth while the intraoral dental radiography was taken. The average absorbed dose of skin near the thyroid gland of patient is 72.2 mu Gy from full mouth series intraoral radiograph with 14 dental films (speed D) using Gendex Panelipse II X-ray machine (75-80kVp, 15mA, 0.25s, FSD = 34-36 cm) with neck shield protection, and the radiation risk of thyroid gland of stochastic effect is estimated to be 3.6 x 10(-8). We also calculated the effective atomic number of enamel and dentin for obtaining the conversion factor of tooth. Four sets of figures were drawn to express the absorbed dose in water phantom and tooth in some different exposure conditions.
The Kaohsiung Journal of Medical Sciences 11/1994; 10(10):565-77. · 0.61 Impact Factor
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ABSTRACT: Plasma cell neoplasm have been classified as multiple myeloma, solitary plasmacytoma and extramedullary plasmacytoma. The solitary plasmacytoma of maxilla is a rare condition. It is a single focus of myelomatous tissue with no dissemination to other parts of the skeleton. This paper presents a case of solitary plasmacytoma in the maxillary bone. Roentgenographic examination revealed a cystic-like osteolytic lesion over the left posterior portion of maxillary bone, invading maxillary sinus. The CT scan showed the tumor mass occupied the left maxillary sinus and lateral wall of the nasal cavity, protruding to the buccal side of the left face. The tumor cells were composed of densely packed round and polygonal cell structures which were scattered in relatively sparse stoma. The neoplastic cells have large, single eccentric nucleus, resembling typical plasma cells. The ultrastructural studies of tumor cells revealed numerous endoplasmic reticulum. There were arranged in a lamellar pattern, large numbers of mitochondria in perinuclear distribution and prominent Golgi complex. Nuclei showed patch condensation of chromatin and large nucleoli. The monoclonal staining (anti-Kappa and anti-IgG) of tumor cells by the peroxidase anti-peroxidase immunohistochemical technique, proved that the plasma cell lesion is neoplastic in nature. The tumor mass was eradicated by total resection, followed by X-ray radiation (4200 RADS). The patient is in good physical condition. There has been no clinical evidence of recurrence three years after surgery.
The Kaohsiung Journal of Medical Sciences 11/1990; 6(10):565-71. · 0.61 Impact Factor
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ABSTRACT: We report a case of the calcifying odontogenic cyst occurring on the left anterior mandible of a 41-year-old male with clinical and radiographic features which made it initially to be a lateral periodontal cyst. This unusual presentation of a calcifying odontogenic cyst is discussed and its significance for the clinician is reviewed. A calcifying odontogenic cyst may present some problems for the differential diagnosis both clinically and histopathologically. The differential diagnosis of a lesion occurring in a lateral periodontal location should include the calcifying odontogenic cyst.
Zhonghua ya yi xue hui za zhi / Zhonghua ya yi xue hui = Chinese dental journal / Dental Association, Republic of China 04/1990; 9(1):42-5.
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The Kaohsiung Journal of Medical Sciences 12/1987; 3(11):708-13. · 0.61 Impact Factor
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The Kaohsiung Journal of Medical Sciences 04/1987; 3(3):182-91. · 0.61 Impact Factor
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The Kaohsiung Journal of Medical Sciences 04/1987; 3(3):155-65. · 0.61 Impact Factor
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The Kaohsiung Journal of Medical Sciences 08/1986; 2(7):478-85. · 0.61 Impact Factor
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The Kaohsiung Journal of Medical Sciences 08/1986; 2(7):460-4. · 0.61 Impact Factor
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The Kaohsiung Journal of Medical Sciences 04/1986; 2(3):149-52. · 0.61 Impact Factor
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ABSTRACT: This is a retrospective study of biopsied oral lesions (N = 534) in a pediatric population (0-15 years old) in southern Taiwan. In this study, we included 6% of the 9672 biopsies performed from 1985 through 1996. The lesions were divided into three groups according to patients' ages, 0-5 years old; 6-10 years old; and 11-15 years old The majority of the samples were from the oldest age group (273/518). With the exclusion of normal tissues (N = 26), 518 samples were classified into four categories: inflammatory lesions, cystic lesions, tumor or tumor-like lesions, and other lesions. The largest number of lesions occurred in the inflammatory lesion group (46%). The 12 most frequently occurring lesions contributed about 78% of all the biopsies in the three age groups (0-15 years old). Frequencies of the lesions of mucous extravasation phenomenon, dentigerous cyst, fibrous dysplasia, and odontonia in our three pediatric age groups showed a significant proportion in the biopsies of the same lesions in the group of patients of all ages. These information may be valuable for both epidemiology and teaching.
Pediatric dentistry 20(7):404-10. · 1.02 Impact Factor
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ABSTRACT: This paper reports a case of palatal pleomorphic adenoma in a Chinese child. The rare histologic feature of osteoid tissues is also presented.
ASDC journal of dentistry for children. 65(3):209-11.
