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Volume 40, Issue 4
Displaying 1-22 of 22 articles from this issue
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Part 2: Experiment of Implantation under Periosteal TissueKenjiro HIDA, Yoshimitsu KAMEYAMA, Yoshihiro SAKAKI, Hidemitsu SHIJOU, ...1991 Volume 40 Issue 4 Pages 729-745
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSHydroxylapatite is a particulate bone substitute material that has been studied extensively for use in oral and maxillofacial surgery. This material, however, is limited in application due to its particulate nature. At the time of placement it lacks form and cohesive strength, and particles may be misplaced or may compress, dislodge, or migrate under externally applied forces. In light of these problems, it seemed appropriate to develop a method for containing the particles during a period of time following implantation, until natural healing occurs.
We have studied the use of a permeable, biocompatible, absorbable tude fabricated from Polyglactin 910 (Vicryl-Schlauch®) to contain the HAP particles in mandibular subperiosteum of rabbits.
The results showed that when HAP was contained, the Vicryl-Schlauche displacement and migration of particles were prevented. Absorption of the tube took place for 12 weeks, after which histologic features were the same as those seen when HAP was implanted alone. Grossly, the implants appeared to hold firmly to bone even 3 weeks after implantation. A new, more efficacious delivery system is proposed for the augmentation of alveolar ridge using HAP contained within Vicryl-Schlauch®View full abstractDownload PDF (26664K) -
Noriyuki NAGAI, Nobuyoshi TAKESHITA, Hitoshi NAGATSUKA, Takumi AKAGI, ...1991 Volume 40 Issue 4 Pages 746-752
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSImmunohistochemical expressions of cytokeratin, amelogenin, and enamelin were studied in odontogenic tumors: ameloblastoma, adenomatoid odontogenic tumor and ameloblastic carcinoma. Four anti-cytokeratin monoclonal antibodies were used in this study: CK-1 to total keratin, SE-K to 56, 56.5, 58 and 68 Kd, NSE-K to 52.5 Kd, and 19 K to 40 Kd. Cytokeratin expression in follicular ameloblastoma was similar to that in tooth germ epithelia, and in plexiform ameloblastoma similar to that in fetal oral mucosa. Both types of ameloblastoma also showed slight immunoreactivity for amelogenin. In adenomatoid odontogenic tumor there was a difference between cytokeratin expression in central cells and in peripheral cells in the tumor nests. Moreover, cytokeratin expression in adenomatoid odontogenic tumor was completely different from those in ameloblastoma and tooth germ. Immunoreactivity for amelogenin and enamelin in adenomatoid odontogenic tumor was found in colloidal drops, calcified masses and lining cell membrane of ductlike structure. Therefore, it is possible that these tumor cells differentiate into enamel protein-producing cells, more than those of ameloblastoma do. Immunohistochemical results in ameloblastic carcinoma showed that this carcinoma is composed of undifferentiated odontogenic tumor cells.View full abstractDownload PDF (5793K) -
Evaluation of Hyaluronic Acid in TMJ Synovial FluidAkira SUZUKI1991 Volume 40 Issue 4 Pages 753-765
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSSynovial fluid properties varied with relation to joint changes. This study attempted to analyze the synovial fluid of temporomandibular joints (TMJ) including such factors as glycosaminoglycans (GAG), molecular weight of hyaluronic acid (HA) and the activity of N-acetyl-β-D-glucosaminidase (NAG). Furthermore, correlations between the biochemical results and both clinical data, or disk configuration were examined.
The present study was tested on 29 joints with TMJ internal derangements (19 with click and 10 with lock) and 6 normal joints. Synovial fluid was collected from upper joint cavity after pumping 3 times with 1.5 ml of 0.2 M NaCl before TMJ arthrography. The GAG were examined by electrophoresis on a cellulose acetate strip after the synovial fluid was digested with pronase, treated with NaCl and extracted by CPC. Molecular weight (M) of HA was determined for instrinsic viscosity [η]([η] = 0.036 M0.78). NAG activity was examined by MCP-NAG method.
The results were as follows ;
1) The GAG was composed of HA only.
2) Molecular weight of HA in normal joints was higher than internal derangement joints (p<0.01).
3) There was no significant correlations between molecular weight of HA and both duration of illness and disk configuration.
4) In lock cases, molecular weight of HA of joints with jaw-openning upper 40 mm and without pain was higher than in joints with jaw-openning below 40 mm and pain (p<0.05).
5) NAG activity was not different between normal and internal derangements.
These results suggest that HA in TMJ synovial fluid is a parameter reflecting the degree of diseased condition of internal derangements.View full abstractDownload PDF (5048K) -
Yuriko MITSUHASHI, Hiroyo DEGUCHI, Yoshio HAYASHI1991 Volume 40 Issue 4 Pages 766-771
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSNormal specimens of lip mucosa taken from 195 surgical materials were examined histopathologically and immunohistochemically to determine mucosal melanocyte incidence and distribution with special references to aging process and sex differences. When all specimens were divided into four age groups (0-19 years, 20-39 years, 40-59 years, and 60-85 years), age-related significant increases of mucosal melanocytes were observed both in males and females, respectively (p<0.01). Especially, the number of mucosal melanocytes in over 60-year old males showed a more remarkable increase than that of other age groups. In addition, significant sex differences were found in each age group (male: 12.09±0.94/ 0.005 mm2, female: 4.11±0.36/0/005 mm2, p<0.001). These results indicate that melanocyte increases observed in the aged may play an important role as a precursor lesion for oral pigmented diseases such as senile lentigo and intraepithelial malignant melanoma.View full abstractDownload PDF (6902K) -
Chiaki YASUMITSU, Toshihiro KIKUTA, Takeshi NAKASHIMA, Nagayoshi YAMAD ...1991 Volume 40 Issue 4 Pages 772-777
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSIn clinical dentistry, it is very important to clear the situation of occlusal contact in diagnosis, treatment, and evaluation of malocclusion and initial contact. The occlusal contact area and points have been selected to evaluate the situation of occlusal contact.
The past measuring methods have, however, several problems, too many complicated processes and artificial errors.
So the new method of using the image analyzer system was created to measure occlusal contact area and points. It was thought that this method was very simple and extremely precise and we will be able to widely apply it to dental practice. In addition, it was considered that the occlusal contact situation is analysed visually and overall by application of this useful method, including occlusal contact position, form, and strength.View full abstractDownload PDF (3947K) -
Histopathological Changes in Tongue Tumor Model of Rabbit Innoculated by VX7 CellsYasuyuki GOTO, Iwai TOHNAI, Toshio KANEDA, Masafumi ITO, Junpei ASAI1991 Volume 40 Issue 4 Pages 778-788
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSIn this report, we studied the pathological changes in rabbit tongue tumor model after single treatment of hyperthermia induced by an implant heating system (IHS) using low Curie point ferromagnetic implants.
Eighteen rabbit tongues were innoculated with VX7 carcinoma cells. On the 12-16 th
days after innoculation, all rabbits were treated with single hyperthermia for 30 min. using IHS, and the tongues tissue temperature was measured by thermocouples. The tongues underwent histological and ultrastructural investigations until 7 days after treatment.
Over 43°C 5 mm apart from the implant in the tumor tissue showed coagulation necrosis. However, the necrotic lesion was irregular shaped and tended to extend gradually toward the peripheral side of the tongue for 3 days. It was the significant evidence that numerous tumor cells were still viable around blood vessels, except in the central zone of necrosis.Tumor cell invasion into blood vessels was observed 5 days after hyperthermia treatment. The heated tumor cells showed ultrastructurally shrinkage of nuclei, aggregation of cytoplasmic components and cell membrane rupture.
These facts indicated that vascuar architecture and blood flow in the tumor tissue played important roles in heat conduction on viability of heated tumor cells during hyperthermia treatment.View full abstractDownload PDF (13421K) -
Part 4: Relationship to the Angle of Masticatory MusclesAkihiro IKAI, Masashi SUGISAKI, Haruyasu TANABE, Susumu KATO1991 Volume 40 Issue 4 Pages 789-800
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSNinety-six mandibular fossa of Japanese dry skulls and angles of masticatory muscles were investigated with three-dimensional measuring apparatus. The results were as follows:
1. The angle of lateral pterygoid muscle from lateral view was more gradual than that of the deepest point of the fossa to articular tubercle (D-A), to midpoint of the eminence (D-E), and to medial glenoid tubercle (D-M). It was considered that the condyle was pressed against the posterior slope of the fossa during mandibular protrusion.
2. There were correlations between the D-E angle and the angle of lateral pterygoid muscle as seen from the cranial view, the angle formed by the lateral pterygoid muscle and masseter. There were correlations between the D-A angle and the angle of medial pterygoid muscle, the angle formed by the medial pterygoid muscle and masseter as seen from the cranial view, mandibular plane angle.
3. From the above mentioned results, it was suggested that the angle of central part of the mandibular fossa eminence was related to the angle of lateral pterygoid muscle, the angle of the lateral part of that was related to the engle of the medial pterygoid muscle and masseter, namely bite force.View full abstractDownload PDF (1224K) -
Hiroto KIMURA, Rou FUKUI, Tamotsu KAGAYA, Sin WATANABE, Hisashi SATO, ...1991 Volume 40 Issue 4 Pages 801-806
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSIt has recently become clear that superoxide anion radical (O2-) produced by neutrophils contributes to tumor cell cytotoxicity and to pulmonary fibrosis induced by Bleomycin. In this study, the O2- production by neutrophils in patients with head and neck cancer was investigated by the CLA-dependent chemiluminescence method. The results were as follows:
The O2- production by neutrophils of patients before treatment was lower than that of healthy volunteers. This finding revealed the suppression of the primary host-defense mechanism of patients. After the administration of anti-cancer drugs to the patients, the O2-production ability of neutrophils stimulated by PMA increased. The O2- production of neutrophils stimulated by OZ or PMA was remarkably enhanced by the addition of Peplomycin (PEP) in vitro. This enhancing effect of PEP on neutrophils in patients was higher than in healthy volunteers. These results suggested that excessive response of neutrophils to PEP was important in onset of the pulmonary fibrosis and in tumor cell lysis.View full abstractDownload PDF (641K) -
Tooru EGUCHI, Kazuo MAEDA, Shuiti NINOMIYA, Hiroshi TAKASE1991 Volume 40 Issue 4 Pages 807-814
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSInternal derangement is defined as an abnormal positional and functional relationship between the disc and mandibular condyle and the articulating surfaces of the temporal bone. These abnormalities were depicted by arthrography. Double contrast arthrotomography was performed in patients with internal derangement. And there was a variation of the degree of disc displacement on the arthrotomographic appearance. The purposes of this article is to describe a method of measuring displacement of the temporomandibular joint disc using double contrast arthrotomograms and to compare the degree of disk displacement with the clinical symptoms.
Sagittal arthrotomographic sections of 84 patients with internal derangement of the temporomandibular joints were evaluated. The outlines of the condyle, the glenoid fossa, the eminence, and the disc were traced onto acetate paper. The most superior and anterior arbitrary points of the condyle were were identified and marked. Normal lines were drawn at these points, meeting at a point within the condyle. A line was drawn from the point to the closest point of the eminence and was established as a reference line for measuring displacement.
The reaerence point of the disc, that is, the middle point between the anterior and posterior border lines of the disk, was marked. The distance between the reference line and the middle point of the disc was notes in millimeters.
The results of this study are as follows: 1) The mean location of the disc was 6.37±2.71mm for all patients. 2) There was no correlation between the degree of disk displascemeat and the clinical symptoms.View full abstractDownload PDF (6511K) -
Masahiro TOMITA, Ichiro MASUI, Toshitaka UJI, Takeshi HONDA, Katsuma K ...1991 Volume 40 Issue 4 Pages 815-825
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESS106 patients underwent orthognathic surgery in our department during the past 13 years, and every year showed a tendency to increase. The ratio between males and females was 1: 3. The age of male patients ranged from 16 years and 10 months to 35 years with a mean of 22 years, and from 11 years and four months to 38 years and 10 months with a mean of 20 years and six months for females.
55 patients (51.9%) were referred from the orthodontic department of our hospital, 27 (25.5%) from orthodontic practitioners, 12 (11.3%) from general dental practitioners, and 12 (11.3%) directly visited our clinic. 71 patients (67.0%) had presurgical orthodontic treatment.
51 patients (48.1%) were diagnosed as having mandibular prognathism, 34 (32.1%) mandibular prognathism with open bite, nine (8.5%) asymmetrical mandibular prognathism, four (3.8%) mandibular prognathism with both open bite and asymmetry, three (2.8%) maxillary micrognathia, two (1.9%) congenital mandibular micrognathia, one (0.9%) skeletal open bite.
As concerns surgical methods, during the first five years only mandibular body ostectomy had been performed, since 1982 sagittal splitting of the rami has carried out, since 1987 Le Fort I osteotomy and simultaneous bimaxillary surgery has been performed.
The average time of the operation was as follows: 3°23' for body ostectomy, 3°29' for sagittal splitting osteotomy, 4°10' for Le Fort I osteotomy, 6°36' for simultaneous bimaxillary osteotomy, 3°49' for alveolar segmental osteotomy.
The average bleeding amounts during operations were as follows: 195.8 ml in body ostectomy, 304.1 ml in sagittal splitting osteotomy, 272.0 ml in Le Fort I osteotomy, 705.6 ml in simultaneous bimaxillary osteotomy, 331.0 ml in alveolar segmental osteotomy. Out of 106 patients, 24 (22.6%) had blood transfusion, 18 had autotransfusion.
The average period of intermaxillary fixation was as follows: 52.4 days for body ostectomy, 48.1 days for sagittal splitting osteotomy with wire osteosynthesis, 19.1 days for sagittal splitting osteotomy with rag screw osteosynthesis, 20.7 days for Le Fort I osteotomy, 28 days for simultaneous bimaxillary osteotomy.View full abstractDownload PDF (1349K) -
Yutaka IMAI, Masanari TOYOHASHI, Haruhiko SAKAMOTO, Yukihiro YOKOKURA, ...1991 Volume 40 Issue 4 Pages 826-839
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSClinical statistical observations were made on 290 jaw fracture patients who had been admitted and treated at the Oral Surgery Dokkyo Medical College for 14 years from January, 1975 to December, 1988. After categorizing their periods into a former term (Jan., 1975 to Dec., 1980) and a latter term (Jan., 1981 to Dec., 1988) they were compared to study the processes of their phases and the association with social regional changes. We conclude:
1) Fracture of the jaw also showed influences followed by changes in modes of living that have recently been seen.
2) Recognition and understanding of treatment for jaw fractures have probably been more enhanced than ever.
3) Although propriety of our therapeautic method has again been recognized, a device intending to shortening the period of required intermaxillary anchorage.
4) Wearing seat belts seemed effective for preventing midfacial trauma including maxillaryfracture.
5) The results of the therapy were nearly satisfactory, except that the fracture of jawjoint protrusion suggested the necessity of studies including the therapeautic method.View full abstractDownload PDF (1538K) -
Yuki UCHIDA, Masaaki GOTO, Hirotoshi NAKAGAWA, Koji HATTORI, Hiroyuki ...1991 Volume 40 Issue 4 Pages 840-854
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSAs the maxillary molar teeth are often in close proximity to the antrum, displacement of a tooth or foreign material into it is not an uncommon experience during dental treatment. Eighteen patients referred to our clinic for between October, 1981 and December, 1990 for removal of dislodged dental roots or foreign bodies were examined.
The patients ranged from 15 to 62 years old, and the age distribution peak appeared in the third decade.
Causes of such displacement into the antrum were mainly accidents in the extraction procedure.The palatal roots of the upper first molar were forced into the antrum more frequentlythan the roots of other teeth. There were 4 cases of dislodged foreign bodies, root canal filling material in two, fractured tip of the root tip pick in one, and rolled cotton in one.
The operations for the removal of roots or foreign bodies were performed under generalanesthesia in 14 cases. Maxillary sinusitis was observed in 4 cases; oro-antral communications recognized in 13 cases were closed by the buccal gingival flaps.
Though the mishap of displaced teeth into the maxillary sinus was not directly related to the length of a dentist's clinical career, foreign material displacement was brought about by dentists somewhat new in their clinical careers.View full abstractDownload PDF (13313K) -
Takeshi USAMI, Takashi WAKAYAMA, Masao ITO, Minoru UEDA, Toshio KANEDA1991 Volume 40 Issue 4 Pages 855-861
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSW e have investigated emergency patients who came to the clinic of Oral Surgery, Nagoya University Hospital from April, 1987 through March, 1989. The results were as follows:
to increase according to ages.
2) There were a few more males than females and most patients were in their twenties.
3) The traumatic patients were the most (22 %), with children the majority of them.
4) 15% of the patients who suffered from dental caries or periodontal disesae were inappropriate for emergency clinic.
5) It is clear that system of dental emergency treatment is necessary and desirable and that oral surgery in the hospital should fill a role as supporting medical facilities. Therefore, it is concluded that advocacy of oral surgery is indispensable to society.View full abstractDownload PDF (734K) -
Mitsuhisa OKITSU, Yasuhiko HIRANUMA, Kouichiro NAGAMINE, Takahiro SHIM ...1991 Volume 40 Issue 4 Pages 862-872
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSThe diagnostic value of 67Ga-citrate and 99mTc-MDP scintigraphy was evaluated in 69 patients with oral and maxillofacial malignant tumors.
(1) Both 67Ga-citrate and 99mTc-MDP scintigraphy produced high positive rates for primary tumors existing in the upper and lower alveolar regions and maxillary sinus.
(2) Histopathologically, positive rates above 50% were obtained in both 67Ga-citrate and99mTc-MDP scintigraphy in patients with squamous cell carcinoma. However, it seemed necessary to take primary site differences into consideration in scintigraphic diagnosis.
(3) In squamous cell carcinoma patients, the positive rates in both 67Ga-citrate and 99mTc-MDP scintigraphy were increased with the enlargement of tumor size and progression of disease stage. A positive correlation was suggested in 67Ga-citrate scintigraphy. In 99mTc-MDP scintigraphy, the tumor size seemed to be more preferable as a reference, since the disease stage varies with the presence and absence of regional lymph node metastasis.
(4) In examination of histopathological differentiation in squamous cell carcinoma patients, 67 Ga-citrate scintigraphy showed no difference in positive rates. For 99mTc-MDP scintigraphy, further examination seemed necessary.
(5) With lymph node metastasis, neither 67Ga-citrate nor 99mTc-MDP scintigraphy were useful in this study.
(6) In examinationView full abstractDownload PDF (9080K) -
Takashi SEKIGUCHI, Makoto NOGUCHI, Keisei SOMA, Tsukasa TSUJI, Masayuk ...1991 Volume 40 Issue 4 Pages 873-879
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSGiant cell lesions are characterized by the presence of multinuclear cells, and those known to develop in the jaws include the giant cell granuloma, the giant cell tumor, the brown tumor of hyperparathyroidism, cherubism, and others. In those diseases, brown tumor occurs rarely in the jaws.
Histologic differentiation between brown tumor and giant cell granuloma may be impossible: as a result, biochemical abnormalities associated with hyperparathyroidism may have to be evaluated.
A case of brown tumor of the right maxilla in primary hyperparathyroidism is reported in this pater. A-44-year-old woman was referred to our clinic with the chief complaint of a painless swelling of the right hard palate.
X-ray CT revealed a well defined rounded mass for disclosing in the right maxillary anturum, although the lesion appeared as a diffuse radio-opaque area on roentgenographic examinations.
The lesion was biopsied and diagnosed as brown tumor. The surgical exicision of the lesion was performed by intraoral approach under general anesthesia.
The clinical course was uneventful after surgery. Eleven months postoperatively, there is no evidence of recurrence.View full abstractDownload PDF (11483K) -
Kaoru KITAGAWA, Ken-Ichiro MURAKAMI, Ei-ichiro KOBAYASHI, Kazuma FUJIM ...1991 Volume 40 Issue 4 Pages 880-885
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSAbstract: In 38 patients with internal derangement of the temporomandibular joint with closed lock, analysis of inter-occlusal relationship and dental cast model interpretation were carried out in comparison with 40 asymptomatic volunteers. Diagnosis was made in all patients by both clinical examination and MR imaging. Frequencies in classification of Angle class definition and incidence of malocclusion were not different between symptomatic and control groups. The number of patients with cross bite and deep bite in the symptomatic group was significantly larger than that in the control group. Cross bite was present mainly in molar teeth and curve of Spee inclined to be slightly deep in the symptomatic group. Though cases were limited in number, it was considered that loading on the temporomandibular joint might be related to internal derangement in patients with cross bite and deep bite.View full abstractDownload PDF (740K) -
Takao SHIMAMURA, Masashi SHIMAHARA, Katsumi ONO, Akira TSUTSUMI, Yoshi ...1991 Volume 40 Issue 4 Pages 886-892
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSAbstract: A case of monomorphic adenoma (tubular type) of the upper lip of a 45-yearold female is presented.
The tumor was located in the upper lip, and was approximately 2.0 cm diameter, freely movable, painless, and not tender when palpated. The tumor was excised under local anesthesia and the specimen sent to the pathology department for histopathologic analysis. The pathologist reported the lesion was the tubular type of adenoma.
The tubular type is a rare salivary gland tumor, and usually occurs in the upper lip. However, in Japan upper lip cases are rare.View full abstractDownload PDF (11358K) -
Report of Three CasesMasanori OGISO, Masao ITO, Yoshihiro SAWAKI, Takeshi USAMI, Iwai TOHNA ...1991 Volume 40 Issue 4 Pages 893-899
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSScratch dermatitis is the one of the side effects caused by Bleomycin and Peplomycin. We recently observed three cases of scratch dermatitis caused by Peplomycin (PEP). In this paper, the clinical courses were reported, and we tried to analyse the mechanism of the dermatitis.
Case 1: A 56-year-old male with cancer of the tongue and floor of the mouth, squamous cell carcinoma, was given PEP 5mg i. v. Subsequently, linear erythema accompanied by pruritus occurred on the nape of the neck.
Case 2: A 60-year-old male with cancer of the gingiva, squamous cell carcinoma, was given PEP 5mg, 10mg and 10mg i. v. Subsequently, linear erythema occurred on the neck, breast, and back.
Case 3: A 62-year-old male with cancer of the tongue, squamous cell carcinoma, was given PEP 10mg, 5mg and 5mg i. v. Subsequently, linear erythema occurred on the back.
Considering the administered dose and the subsequent course, we suggest that these cases of scratch dermatitis resulted from an allergic reaction.View full abstractDownload PDF (4895K) -
Kenji FUJISAWA, Hiroaki NAKANISHI, Kazuhito SATOMURA, Katsuhiro YASUDA ...1991 Volume 40 Issue 4 Pages 900-911
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSThe calcifying odontogenic cyst is histopathologically characterized by the presence of ghost cells and calcified tissues in the epithelial layer of the cyst wall. We recently experienced 3 calcifying odontogenic cyst cases.
The patients were a 24-year-old male, 7-year-old girl and 22-year-old female. Radiographic examinations showed clear bordered radiolucent areas containing several small radiopaque spots. Cystic lesions were extirpated surgically in all cases. Histopathological examination from the resected specimens revealed the presence of ghost cells and calcified tissues in the cyst wall. One of the cases had the complication of odontoma.
We here report the 3 cases of calcifying odontogenic cyst with a review of the literature.View full abstractDownload PDF (17886K) -
Akihisa OHSHIMA1991 Volume 40 Issue 4 Pages 912-918
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSMolars, especially lower second or third molar, frequently drift mesially, tilting into an edentulous space. In this area, it may be impossible to maintain normal plaque control. The roots were at such an angle that the periodontium did not receive occlusal forces at the most advantageous angle and severe periodontal breakdown may occur.
If the tooth had been tipped distally, forces would have been received in a more axial direction and plaque removal would have been easier.
A 12-year-old female presented a mesially tilted second molar. Following extraction of the third molar, a corticotomy was performed along the distal of the second molar. Orthodontic movement was started immediately after surgery, before bony healing occurs. The tooth was corrected in 3 months with fixed appliances. Fixed appliances were then used for 6 months of retention and it was very effective to control the eruption (the tooth 17) with the occlusal plate.View full abstractDownload PDF (9329K) -
Toshifumi ISHIBASHI1991 Volume 40 Issue 4 Pages 919-924
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSI encoutered a 9 year-old girl, who had a dentigerous cyst containing canine, first premolar, and second premolar in the right mandible. Under local anesthesia, the cyst was treated by marsupialization, she is now well and free of the cyst. The cyst wall histologically consisted of erosive squamous epithelium, inflammatory granulation layer with many plasma cells, and fibrous tissue.View full abstractDownload PDF (8093K) -
Relationship between Characteristics of Sounds and Symptoms Related to TMJ DysfunctionKojiro ONIZAWA, Hiroshi FUKUDA, Kazuo NEMOTO1991 Volume 40 Issue 4 Pages 925-934
Published: October 10, 1991
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSThe purpose of this investigation was to analyze the relationship between types of TMJ sounds and TMJ related symptoms in a nonpatient population. Among 2108 firstyear university students, dentists found 132 with TMJ sounds. They were assessed for the presence of masticatory pain and dysfunction through a questionnaire and a clinical examination. The results were as follows:
1) They were classified into 5 groups according to the characteristics of the sound:
audible clicking (23 students)
clearly palpable clicking (47 students)
slightly palpable or intermittent clicking (45 students)
crepitation (4 students)
others (13 students)
The students in the audible clicking group and the clearly palpable clicking group complained of more TMJ related uncomfortable symptoms.
2) Based on the timing, occuring side of the joint, and characteristics of clicking a more detailed analysis was conducted. 26 students complained of a pain in the TMJ and it was significantly more prevalent in men (p<0.01). These students were recognized with a high prevalence in bilateral clicking (p<0.05), audible clicking (p<0.05) and occurrence during opening and closing the mouth (p<0.001).
These results indicates that a louder and more frequent clicking may cause more TMJ related uncomfortable symptoms in a nonpatient population.View full abstractDownload PDF (1168K)
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