No abstract available.
9,10-Dimethyl-1,2-benzanthracene ; Animals ; Rats ; Submandibular Gland

No abstract available.
Adult* ; Animals ; Dogs* ; Humans ; Mandible*

No abstract available.
Odontogenic Tumors*

No abstract available.
Replantation*

No abstract available.
Carcinoma, Squamous Cell* ; Leukoplakia* ; Papilloma*

No abstract available.
Ameloblastoma

Two major salivary glands, submandibular duct, lingual nerve, and vessels are situated beneath the mouth floor. Among these, passing through the pterygomandibular space, lingual nerve is innervated to the lingual gingiva and the mucosa of mouth floor, and is responsible for the general sensation of the anterior two thirds of the tongue. So, the injury of the lingual nerve during an anesthesia or surgery in the retromolar area may cause complications such as a numbness, a loss of taste of the tongue and the other dysfunctions. Therefore, to find out the morphology and the course of lingual nerve and to clarify the topographical relationships of lingual nerve at the infratemporal fossa and paralingual space area, 32 Korean hemi-sectioned heads were dissected macroscopically and microscopically with a viewpoint of clinical aspect in this study. This study demonstrated various anatomical characteristics with relation to the course and topography of the lingual nerve in Koreans. And clinical significances based on the anatomical variations through the topography of the courses and communications between the mandibular nerve branches were described in details.
Anesthesia ; Chorda Tympani Nerve ; Gingiva ; Head ; Hypesthesia ; Lingual Nerve* ; Mandibular Nerve ; Mouth Floor ; Mucous Membrane ; Salivary Glands ; Sensation ; Tongue

There have been many different histological typing of odontogenic tumours and numerous reports on the epidemiological studies of the odontogenic tumours depending upon various these histological typing. Neoplasms and other tumours related to the odontogenic apparatus was classified into 21 entities by WHO in 1992. The purpose of this study is to get the clinically basic data of the odontogenic tumours in Korean according to this newly made WHO histological classification. The total of 4913 biopsied specimens were reviewed from the dept of Oral Pathology, College of Dentistry, Yonsei University for the period of Jan. 1985. to Dec. 1996. and among them 156 cases were diagnosed into the odontogenic tumours. The following results were obtained: 1. Odontogenic tumours were 156 cases(3.18%) of the total 4913 biopsy cases. Only the 10 different benign entities were observed in 156 cases of odontogenic tumour. 2. The most frequent odontogenic tumour was ameloblastoma(42.3%) and followed odontomas (41.0%), adenomatoid odontogenic tumours (4.5 per cent) and ossifying fibroma(3.8%) in order. 3. Overall male to female ratio was 1.14(53.2%) to 1(46.8%), but female ratio is higher than male in odontoma(53.1%) and myxoma(75.0%) respectively. 4. 134 cases(85.9%) of all odontogenic tumours were observed under the age of forty. Age distribution showed 60 cases(38.5%) in the second decade, 37 cases(23.7%) in the third decade, 22 cases(14%) in the fourth decade and 15 cases(9.6%) in the first decade of life 5. The ratio of odontogenic tumours of the mandible to maxilla was about 2 : 1 . Odontogenic tumours occured predominantly in the molar region(29.6%) and gonial region(17.08%) of the mandible and anterior region(18.8%) of the maxilla. Ameloblastoma occurred mostly in the molar region(45.5%), gonial region(28.1%), ascending ramus region(10.7%) and premolar region(9.1%) of the mandible, while odontomas predominated in the anterior region(44.9%) of the maxilla. 6. Most ameloblastomas were related with more the impacted teeth(62.1%) and root resorption(53.0%) than teeth migration(27.3%). In case of odontoma, teeth impaction(62.5%), teeth migration(75.0%) and root resorption(7.8%) were observed. 7. In the ameloblastomas, facial swelling was the most frequent chief complaint(80.3%) and followed by pain(9.1%).
Age Distribution ; Ameloblastoma ; Bicuspid ; Biopsy ; Classification ; Dentistry ; Epidemiologic Studies* ; Female ; Humans ; Male ; Mandible ; Maxilla ; Molar ; Odontoma ; Pathology, Oral ; Tooth

Orthognathic surgery of the mandibular prognathism and the retrognathism is tend to be performed on the mandibular ramus to prevent inferor alveolar nerve injuries. The purpose of this study is to find a safe and accurate reference point on mandibular ramus for orthognathic surgery by comparative anatomical study of dentofacial deformity patients. We use 38 Korean Cadavers with normal occlusion(Group 1), 3-dimensional simulation of computerized tomogram of 23 patients with retrognathism (Group 2), 27 patients with mandibular prognathism (Group 3). Following results are obtained : 1. The maximum thickness of the mandibular ramus is 8.78+/-1.15mm for Group 2, 7.61+/-1.26mm for Group 1, 6.95+/-0.82mm for Group3 respectively (P=0001). The minimum thickness is 5.51+/-1.08mm for Group 1 , 5.06+/-0.40mm for Group 2, 4.56+/-0.78mm for Group3, respectively (p=0.0001). But, the thickness at the level of 5mm above the lingular is 0.78+/-0.65mm for Group 2, 5.63 +/-1.28mm for Group 1, 5.32+/-0.91mm for Group 3, respectively. There is no significant difference between these groups(P=0.0510). 2. The horizontal location from the midwaist point to lingular is 0.18+/-1.57mm for Group 1, 0.69+/-1.33mm for Group 2, 0.66+/-1.66mm for Group 3, and there is no significant difference between these groups(p=0.0835). But the vertical location from the midwaist point to lingular is 1.45+/-2.64mm for Group 1, 0.63+/-1.44mm for Group 2, 0.34+/-1.81mm for Group 3, and there is significant difference between these groups(p=0.0030). 3. The horizontal location from the midwaist point to mandibular foramen is 0.29+/-1.75mm for Group 1, 0.63+/-1.44mm for Group 2, 0.34+/-1.81mm for Group 3, and there is no significant difference between these groups(p=0.5403). But the vertical location from the midwaist point to mandibular foramen is -3.33+/-4.43mm for Group1, -4.79+/-2.26mm for Group 2, -6.06+/-2.99mm for Group 3, and there is significant difference between these groups(P=0.0001). 4. The horizontal length from the disto-buccal cusp tip of mandibular second molar to lingula is 30.97+/-4.17mm for Group 3, 28.29+/-2.65mm for Group 1, 25.48+/-0.77mm for Group 2 (p=0.0000), and also vertical length is 7.72+/-3.22mm for Group 3, 6.38+/-1.83mm for Group 1, 5.89+/-2.30mm for Group 2 (P=0.0014). 5. The location of lingular is 0.50 from anterior border of mandibular ramus in all groups, if it assumed the length from anterior border to posterior border is 1. And it is almost 0.33 from the sigmoid notch, if it assumed the length from sigmoid notch to antegonial notch is 1. 6. In Group 1, Antilingular prominence is located on (1.12+/-1.43mm, 4.01+/-2.36mm) from the midwaist point, and there is no correlation between antilingular prominence and lingular, mandibular foramen.
Cadaver ; Colon, Sigmoid ; Dentofacial Deformities* ; Humans ; Molar ; Orthognathic Surgery ; Prognathism ; Retrognathia

A material of 48 patients with 60 avulsed and replanted permanent teeth were followed retrospectively in the period of 1996. 1 to 1998. 12 (mean observation period=1year 7months). The age of the patients at the time of replantation ranged from 9 to 63 years (mean=24 years). Clinical records of patients were reviewed to obtain valid data concerning the extent of injury and treatment provided. Pulpal and periodontal healing states were examined with periapical x-rays and clinical examination procedures (i.e. percussion test and mobility test) at their recall visit. Root ankylosis was found in fifty-two teeth (87%) and root resorption in twenty-four (40%). Only two of the replanted teeth (3%) showed partial regeneration of the periodontal ligament. Six teeth (10%) resulted in tooth loss, but the remaining fifty-four were clinically well functioning. Most of teeth have mild marginal bone loss accompanied by gingival retraction without pathological periodontal pockets. The incidence of root resorption was much higher in younger age group. However, it was not affected by the interval between avulsion and replantation, the condition of supporting tissues, the degree of root formation and the type of splinting, indicating that multiple factors involved in determining the prognosis of replanted teeth. Based on these findings, avulsed teeth in unfavorable conditions (i.e. long extra-alveolar periods, etc.) should be preserved if possible.
Ankylosis ; Humans ; Incidence ; Percussion ; Periodontal Ligament ; Periodontal Pocket ; Prognosis ; Regeneration ; Replantation* ; Retrospective Studies ; Root Resorption ; Splints ; Tooth Loss ; Tooth Replantation ; Tooth*