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Volume 51, Issue 1
Displaying 1-11 of 11 articles from this issue
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Masaaki GOTO2002 Volume 51 Issue 1 Pages 1-14
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSWe have analyzed effectiveness of and problems associated with the dental implant used to support a maxillofacial prosthesis. Our report is based on clinical cases we encountered during the past ten years in the Department of Maxillofacial Surgery, Saga Medical School.
Issues analyzed are the following: clinical outcome of implants used in prosthetic treatment; difficulties that might arise in such a treatment; post-treatment evaluation of the patient's masticatory function; difficulties that one might encounter in implant treatment with facial prostheses, and prospects for implant-supported maxillofacial prostheses.
Some problems that are focused on and discussed according to our analysis are as follows: timing of installation of the implant; insufficient peri-implant tissue; implanted flaps surrounding the implant; clearance and occlusion between maxilla and mandible; careless operation; difficulty in instrument handling in the oral cavity, and predictability of the implant applied to the maxilla.
Implant-supported maxillofacial prosthesis is sufficiently highly predictable nowadays, in terms of clinical success, such that this treatment modality must be included in the health insurance system as soon as possible. Also stressed is the importance of teamwork on the part of an oral surgeon, periodontist, and prosthodontist in implant-supported maxillofacial prosthodontic treatment.View full abstractDownload PDF (9699K) -
Hajime FUJITA, Masaki NAGATA, Kazuhiro ONO, Ritsuo TAKAGI2002 Volume 51 Issue 1 Pages 15-22
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSWe examined linkage between candidate genes, BCL3 and nearby genes on chromosome 19, and non-syndromic cleft lip with or without cleft palate (CL/P) in Japanese families using a parametric method. Nine multigenerational CL/P families were ascertained through the Department of Oral and Maxillofacial Surgery, Niigata University Dental Hospital. After informed consent was obtained, blood samples were drawn from 60 individuals, 20 of whom were affected, and genomic DNAs were extracted. PCR-amplified products using four microsatellite markers: D19S178, BCL3, 007/008, and AC1/AC2, located in 19q13.2, were separated by 8 % polyacrylamide gel electrophoresis and visualized by silver staining. In addition, allele frequencies and heterozygosity values of four markers were analyzed for 50 healthy unrelated Japanese individuals. Two-point linkage analysis was carried out using the MLINK program of the LINKAGE package, and LOD scores were calculated for each family, assuming an autosomal dominant model of inheritance with reduced penetrance. We also tested for linkage including phenotypic information only for affected individuals in each family. Consequently, no evidence of linkage was detected at four loci in the affected-only model. And, assuming that penetrance for affected individuals was set alternatively at 80%, 60%, and 30%, no evidence of linkage was detected within about 0.1 to 0.3 cM on both sides of D19S178, 007/008, and AC1/AC2 loci. On the other hand, the maximum LOD score for BCL3 locus was 0.206 at a recombination fraction of 0 when penetrance was set at 99.9%, indicating that linkage to candidate genes was not defined.View full abstractDownload PDF (1440K) -
Influence of Ratio Differences on Biocompatibility of Hydroxyapatite · Tricalciumphosphate CompositeTakashi OKADA, Tatsuo SHIROTA, Futoaki Matsubara, Masataka YAMAZAKI, M ...2002 Volume 51 Issue 1 Pages 23-34
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSWe experimentally produced hydroxyapatite (HA) ·tricalciumphosphate (TCP) composites (HA·ETCP) having respective combination ratios of HA to TCP of 8: 2 (HT-82), 5: 5 (HT-55), and 2: 8 (HT-28), and histologically evaluated the influence of radio differences on the bone compatibility and biotransformation of the HA · TCP composite. We used 9 Japanese white house rabbits as experimental animals, and placed the 3 types of cylinderical HA · TCP composite, and sintered HA, of size 5 mm in diameter and 10 mm in length, in the tibia. On the 14th, 84th, and 168th days after placement, we sacrificed the rabbits and excised the tibia. Then, we cut non-demineralized ground specimens, and performed toluidine blue staining to histologically observe the tissue reaction around the ceramic and the changes in the ceramic. As a result, each HA · TCP composite showed similar bone compatibility to that in HA. There were no apparent changes in the surface of HA observed during each experimental period. HT-82 showed absorption of the ceramic on the 168th postoperative day. HT-55 showed absorption of the ceramic on the 84th postoperative day, and marked absorption images on the 168th postoperative day. HT-28 showed marked absorption of the ceramic on the 14th postoperative day, and absorption had progressed to the inside of the ceramic on the 168th postoperative day. These findings showed that, by adjusting the combination ratio of HA to TCP, production of synthetic bone graft materials with different properties, and wide-range clinical application, would be possible.View full abstractDownload PDF (8708K) -
Development of New Texture AnalyserYoshie KINUMATSU, Yukihiro MICHIWAKI, Mika YOKOYAMA, Ken-ichi MICHI, T ...2002 Volume 51 Issue 1 Pages 35-42
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSFood texture is known to reflect its physical characters, such as hardness, adhesiveness, and cohesiveness. However, those characters are variable depending on the test conditions. Because the pressure speed and the plunger shape are different from the human masticatory system, the physical character of food reported in the previous study was significantly different from what human beings feel during mastication. The new system can measure physical characters of food under conditions similar to thoseof human jaw movement. It has a wide range of compression speed from 0.1 to 100 mm/sec, and new plungers, and plunger guides based on human molar teeth and incisor teeth with the same accuracy level as an ordinary texture analyzer. The results suggested that the new system was considered to be useful to clarify relations between food characters and masticatory function.View full abstractDownload PDF (1208K) -
Toshiyuki ISHIGAMI, Kojiro ONIZAWA, Hiroshi YOSHIDA2002 Volume 51 Issue 1 Pages 43-47
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSTo disclose the characteristics of pericoronitis of the mandibular third molar in elderly patients, the condition of the impacted third molar, the symptoms, and the clinical course of the disease were investigated in 25 elderly patients over 65 years old with pericoronitis, using medical records and panoramic radiographs, in comparison with 25 adult patients between 18 and 35 years old. Pericoronitis in the elderly patients occurred more frequently in male than in female, and showed more various symptoms in the initial visit, compared with the younger adult patients. Many elderly patients received removal of the third molar under hospitalization because theywere affected by systemic disease, and they had long treatment courses. Many lower third molars of the elderly patients were exposed with pinhole-sized perforation of the gingiva, and embedded with an inverted long axis in relation to the line of the alveolar ridge, in approximation with the inferior alveolar canal. These clinical and radiological findings were considered to be characteristic of pericoronitis in the elderly patients.View full abstractDownload PDF (1618K) -
Yoshiko ARIJI, Masakazu GOTOH, Masahiro IZUMI, Munetaka NAITOH, Kenich ...2002 Volume 51 Issue 1 Pages 48-55
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSObjective: The purpose of this study was to investigate odontogenic infection pathways into the maxillofacial fascial spaces, especially into the parapharyngeal space, in relation to causal tooth and clinical symptoms.
Study Design: CT and MR images were retrospectively investigated in 47 patients with spread of odontogenic infection into the maxillofacial spaces. The involvement of spaces was evaluated based on lateral asymmetry of their shapes and density on CT images or intensity on MR images.
Results: Involvement on images was observed in 70%, 49%, and 30% of the submandibular, the masticator, and the parapharyngeal spaces, respectively. Patients with submandibular space involvement often had spontaneous pain. Of 14 patients with parapharyngeal space involvement, 8 patients showed dysphagia and/or fever, and 13 patients showed involvement of the mandibular molar as a cause of infection. All of these 14 patients also had submandibular space involvement, while only 7 patients (50%) showed changes in the medial pterygoid muscle. The fat layer between the medial pterygoid muscle and parapharyngeal space was maintained in 11 of 14 (79%) patients with parapharyngeal involvement.
Conclusion: CT and MR images clearly demonstrated the spread of odontogenic infection into the maxillofacial spaces. Involvement of the parapharyngeal space was mostly caused by infection originating in the mandibular molar, and was considered to be secondary spread from the submandibular space and/or medial pterygoid muscle.View full abstractDownload PDF (4056K) -
Clinical Study on MRI Low Signal Intensity of Posterior Disc Attachment in Patients with Closed LockTakayoshi OHNUKI, Masayuki FUKUDA, Hiroshi SEKI, Junichiro NARA, Mitsu ...2002 Volume 51 Issue 1 Pages 56-61
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSThe purpose of this study was to evaluate the signal intensity of posterior disc attachment on T1-weighted magnetic resonance imaging (1.5 Tesla), before and after treatment, in patients with closed lock.
Ninety joints (90 patients) that were successfully treated were included in this study. The patients were analyzed in 4 groups as follows: splint therapy cases, pumping manipulation cases, arthrocentesis cases and arthroscopic surgery cases. We compared the signal intensity of the posterior disc attachment before and after each treatment.
In all cases after treatment, range of motion and joint pain were improved remarkably. In the pumping manipulation group and the arthroscopic surgery group, there was significant association between before and after treatment in the change of signal intensity in the posterior disc attachment, whereas no statistical difference was found in the splint therapy group and the arthrocentesis group.
These results suggested that the improvement of joint pain and dysfunction after splint therapy and arthrocentesis was not correlative to the low signal intensity in the posterior disc attachment. The improvement of joint pain and dysfunction after pumping manipulation and arthroscopic surgery was correlative to the low signal intensity in the posterior disc attachment after treatment, and the low signal intensity seemed to show fibrous change of the posterior disc attachment as pseudo-disc formation.View full abstractDownload PDF (1716K) -
Kazuhide MATSUNAGA, Kazunari OOBU, Hiromasa YOSHIKAWA, Masaaki SASAGUR ...2002 Volume 51 Issue 1 Pages 62-68
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSPostoperative infection in the oral and maxillofacial region, at the First Department of Oral and Maxillofacial Surgery, Kyushu University, was studied (clinically). Of 1, 116 patients who underwent surgery from January 1995 to October 1999, 41 patients suffered from postoperative infection (3.7%). The rates of postoperative infection for oral malignant tumor, jaw deformity, benign tumor or cyst, injury, and cleft lip or palate were 12.7%, 1.9%, 1.5%, 1.2%, and 0.4%, respectively. The average operation time of the cases with postoperative infections was 9 hours 17 minutes, and it was longer than that of non-infection cases (p<0.001). Infections were recognized at 8.1 days after surgery, and it took 21 days until cessation, on average. Once a postop-erative infection occurred, agents of prophylactic administration of antibiotics were changed to therapeutic agents and were used for about 21 days. In 29 cases out of 41 postoperative infections, bacteriological examinations were performed, and a total of 66 microorganisms, including 9 MRSAs, were isolated. Concerning oral malignant tumor, 28 out of 34 postoperative infection cases were en bloc surgery cases.
It is considered that avoiding wound dehiscence and the formation of dead space is important to reduce postoperative infections.View full abstractDownload PDF (963K) -
Junichi ISHII, Hirokazu NAGASAWA, Masashi YAMANE, Tadashi WADAMORI, Ma ...2002 Volume 51 Issue 1 Pages 69-75
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSThe aims of this study were to compare histopathologic findings with ultrasound (US) and MRI as to delineation of the capsule and internal structure of major salivary gland tumors, and to prove their usefulness.
Between 1989 and 1998, seven patients with malignant tumors of the major salivary gland were surgically treated at the first Department of Oral and Maxillofacial Surgery of Tokyo Medical and Dental University. The distribution according to sex was five women and two men. The average age of the patients was 60.4 years; the median was 65 years. The youngest patient was 26 years old, and the oldest was 76. There were two mucoepidermoid carcinomas, two adenocarcinomas, two adenoid cystic carcinomas, and one acinic cell carcinoma.
Well-defined or ill-defined boundary and the presence or absence of capsule were in agreement with US and MRI, except for one case of the MRI. Both US and MRI imaging of the internal structure of the tumors was essentially in agreement with pathological findings.
It was concluded that US and MRI could be useful diagnostic techniques for preoperative evaluation of a malignant tumor of a major salivary gland.View full abstractDownload PDF (3597K) -
Mikie SHIRAKATA, Satoru SHINTANI, Manabu TAKARADA, Masakazu NISHIDA, H ...2002 Volume 51 Issue 1 Pages 76-80
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSA rare case of cavernous hemangioma of the maxillary sinus is reported. A 52-year-old male was referred to our hospital with the chief complaint of diffuse swelling at the left maxilla. A soft mass had developed rapidly after extraction of the left first molar at a dental office.
Since the tumor grew rapidly and was covered with tissue necrosis, the tentative diagnosis was a malignant tumor of the maxillary sinus. Though a histological diagnosis by biopsy could not be made, because of the tissue necrosis, the patient was diagnosed as having a maxillary hemangiomatous lesion by CT, MRI, and angiography. He underwent cryo-surgery, embolization, and radiation therapy. Cryosurgery produced no effect of tumor remission. Embolization with n-butyl-2-cyanoacrylate and a metal coil at the branches of maxillary and facial arteries inhibited tumor growth for one month. Then the tumor showed rapid growth. Since the patient refused a proposed radical maxillectomy, radiation therapy was carried out as palliative therapy. After 32 Gy of radiation, the tumor decreased markedly in size. The tumor has remained dormant for 2 years since the radiation therapy.View full abstractDownload PDF (3945K) -
Tomohiro YAMADA, Fumio KINOSHITA, Takahiro MIYAJIMA, Toshihide DOI, To ...2002 Volume 51 Issue 1 Pages 81-85
Published: January 10, 2002
Released on J-STAGE: September 07, 2011
JOURNAL FREE ACCESSAn 11-year-old female visited our facility complaining of delayed eruption of the first and second molars on the left maxilla. Diffuse swelling of the left cheek was found, and a cafe-au-lait spot was detected. Multiple café-au-lait spots were also observed on the right hand, abdomen, and axilla. An intraoral, bony swelling was found in the left maxillary molar lesion. Alkaline phosphatase levels were high, at 878 IU. She had not yet menstruated. Bony changes were not found on radiographic examination. MRI and CT scans, however, revealed areas of soft tissue density in the left maxilla and cheek, with slight enhancement. Her mother, grandfather, younger brother, and sister had previously been diagnosed as having von Recklinghausen's disease. They had no intraoral symptoms.
She was diagnosed as having von Recklinghausen's disease with a diffuse plexiform neurofibroma, and was treated by resection of the tumors in the maxilla, and biopsy of the cheek lesion. The histopathological diagnoses were neurofibromas. Subsequently, resection of the cheek tumor was performed to prevent facial deformity. Subsequently, the left first molar erupted in 1 year, and good facial symmetry was maintained. However, careful observation continues to be required.View full abstractDownload PDF (2439K)
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