The present study is composed of the following four experiments. (1)The relationship between the initiation of occlusion and the bone formation after implantation of the alumina implants on the mandibles of eight adult mongrel dogs was studied histologically. (2)The functional adaptation of the tissue surrounding the alumina, hydroxyapatite and titanium implants was studied histologically using six adult mongrel dogs and three adult monkeys. (3)The stress distribution around the alumina, hydroxyapatite and titanium implants was studied using the threedimensional finite element stress analysis. (4)The stress distribution around the alumina implant was studied using the two-dimensional finite element model, in which the slip and the separation between the implant and the surrounding tissue were allowed to occur.
In the case of the alumina implant under occlusion at 2,4 weeks after implantation, the implant was covered with thick fibrous connective tissue. In the case of the implant under occlusion at 8 weeks after implantation, thick fibrous connective tissue was found on a part of the implant surface. In the case of the implant under occlusion at 12 weeks after implantation, bone formation was found on the most part of the implant surface, and thin fibrous connective tissue was found at the implant-bone interface.
Thin fibrous connective tissue was found at the alumina implant-bone interface. But no fibrous connective tissue was found around the hydroxyapatite and titanium irnplants, and bone resorption and connective tissue ingrowth were found in the crestal region of the alveolar bone.
By the three-dimensional finite element stress analysis, the alumina implant with connective tissue at the implant-bone interface caused considerably uniform stress distribution without critical stress concentration in the crestal region of the alveolar bone, but the hydroxyapatite and titanium implants without connective tissue caused high stress concentration in the crestal region of the alveolar bone.Presence of connective tissue layer at the implant-bone interface reduced the stress in the crestal region.
By the finite element stress analysis with the boundary condition of the slip and the separation,the alumina implant with connective tissue at the implant-bone interface caused more favorable stress distribution than without connective tissue. The incorporation of connective tissue at the implant-bone interface was led to uniform stress distribution. The high stress concentration calculated in the crestal region of the alveolar bone was found to cause bone resorption and subsequent connective tissue ingrowth.

抄録全体を表示

The purpose of this study was to evaluate the three types of most commonly used calcium hydroxide endodontic sealers, Sealapex, Calvital and Pulp Canal Sealer.
The fumer of dog was implanted with gelatine capsulated sealers for three months. The specimens were removed and prepared for histological analysis.
There were significant differences between reactions observed in the fumer of dog.
Sealapex was completely resorved. Only a mild inflammatory reaction can be observed around the inner circumferential.
Calvial was completely resorved, too. A severe inflammatory reaction can be obsereved all over the bone tissues.
Pulp Canal Sealer specimen demonstrated a residue with in the marrow cavity. It showed a residual mass of Pulp Canal Sealer surrounded by the necrotic tissue and fibrinoid degeneration.

抄録全体を表示

The purpose of this study was to introduce an occlusogram which was 1:1 photographs of dental casts and to apply it in treatment planning and post-operative evaluation for implants. Occlusogram was taken by DSC-618-A PHOTOPET which is very useful in taking occlusograms accurately with gravure film.
We picked one case out of the latest implanting cases and tried to analyze dental casts by using occlusogram for treatment planning and post-operative evaluation of the implant.
As a result, the positional relationship of four elements:alveolar ridge, implant, superstructure and opposite teeth were superimposed according to demand and we were able to determine the right position for implant-insertion and to observe the positional relationship of the four elements from occlusal direction.

抄録全体を表示

We studied cutting characteristics of ceramic implant materials. Three ceramic implant materials(Zirconia, Alumina, Hydroxyapatite), natural teeth,composite resin core and 12% Au-Pd-Ag alloy were used in this study. The Knoop hardness, characteristics of being cut concerning materials and clinical evaluation of characteristics of being cut were studied.
The following results were obtained.
1.In Knoop hardness, Alumina was the hardest of the materials and Zirconia, Hydroxyapatite,12% Au-Pd-Ag alloy and composite resin core followed.
2. In characteristics of being cut, Hydroxyapatite was better than others, and composite resin core,12% Au-Pd-Ag alloy, Zirconia and Alumina followed.
3.When we cut materials, we felt that Hydroxyapatite had the best characteristics for cutting and Alumina followed. Zirconia had the worst charactoristics.

抄録全体を表示

2-dimentional shape analysis was studied for the purpouse of clinical use. The resarched materials were dental implants made by Zirconia ceramics with the use of the finite element method. The dental implant was designed blade type looked like arch-shaped in lower surface. It was supposed six types for supporting condition.
As a result of analysis for each supporting condition, three weak points of its intensity were found,they were;arch-shaped area of under surface, both endlooked like wing and around the central vent.
Then, they were reformed flat surface only in its under portion from arch-shape. In consequence, good results were obtained, unless stress concentration and ditsurbance of stress distribution.

抄録全体を表示

犬に植立した骨内インプラント（ブレード・ベント　インプラント，Tタイプ　バイオセラム　インプラント．Eタイプ　バイオセラム　インプラント）の4～5年経過例について，非脱灰組織標本を用いて病理組織学的に検討した．なお屠殺時には，プレード・ベント　インプラントはヘッドがネック部で頬側・遠心方向に屈曲し，Tタイプのバイオセラム　インプラントはネック部でヘッドが破折・脱落していた． 1．骨組織内において Eタイプ　バイオセラム　インプラントの周囲にはほとんど骨の接触はみられず，厚い線維性結合組織が介在していた．Tタイプ　バイオセラム　インプラントの周囲には2層性の線維性結合組織が介在し，その外側に成熟骨が認められ，一部で骨が接触していた．なお内側の緻密な線維組織内には石灰化巣が認められた．一方，ブレード・ベント　インプラントの周囲には，ネック・ショルダー部で慢性炎症性細胞の浸潤を伴う疎な線維性結合組織が，フット部で炎症性反応がほとんどみられない緻密な線維性結合組織が，ベント付近で成熟骨が認められた．なおネック周囲にはロート状の骨吸収がみられた． 2．粘膜内において Eタイプ　バイオセラム　インプラントは，粘膜上皮ならびに固有層の線維性結合組織と良好に接触し，歯肉溝は浅く，炎症性反応はほとんど認められなかった．一方ブレード・ベント　インプラントでは，歯内溝はやや深く，上皮の深行増殖ならびに炎症性反応が認められた． 一般臨床で長期に経過した骨内インプラントの周囲には，本研究のごとき多彩な組織像が成立していることが考えられた．

抄録全体を表示

The endodontic endoseous implant was performed to insert the implant pin into the alveolar bone around the root of the tooth for the purpose of keeping the tooth by improving the ratio of crown and root, by switching over the tooth movement to deep position.
Recently, the conditions have changed for what was considered the limit of tooth preservation, and the positive application of surgical endodontic treatment makes it possible to preserve the tooth in cases which were diagnosed before as impossible to keep.
Especially, it is not exaggerated to say that this treatment is the final approach for this purpose.Several clinical cases show that it is certain.

抄録全体を表示

Endosseous implant is relatively good in prognosis and adovocated by many implantologists. However,the head of implant, of which neck pierces through the mucosa, is exposed in the month. Therefore,the tissue control of around the neck of implant is one of vaital factors for the longerity of implant.
The patient has not necessarily enough attached gingiva to circumference the neck of implant, so surgical expansion of attached gingiva has been applied in implantology. But, gingival expansion surgery and endosseous implantation have been usually executed separately in different days, then the patients suffered twice.
The author developed a procedure whereby endosseous implantation and apically repositioned flap operation were conducted at the same time. The technique and clinical cases of the one-day procedure were reported in this paper.
Although there have been a small number of clinical applications so far, the author is confidenced in this procedure which should be an exellent mode of surgery free of complication such as necrosis of mucosa, periostium and bone itself.

抄録全体を表示

AH-26 is a synthetic resin that has been in use for more than 30 years;its properties have been extensively investigated. It is composed of a thick liquid(biophenol epoxy resin)and a powdered silver,and hexamethylene tetramine.
It is known that freshly mixed AH-26 is irritating to the tissued, but it becomes inert after setting, a ong process that takes 30 to 40 hours.
The drills were fabrecated to fit the size of capsules. Freshly mixed AH-26 were placed into the femur marrow tissue of dogs.
AH-26 specimen showed residues seen in the vicinity of the left defect. Aseas of inner basic lamellae were evident within dense inflammatory infiltrate.

抄録全体を表示

N2 is basically a zinc oxide and euginol cement to which has been added phenyl-mercuric borate, lead tetroxide, and paraformaldehyde to achieve, according to Sargenti,“fixation and prevent decomposition of tissue”.
N2 was implanted into the femur marrow tissue of dogs.
N2 specimen demonstrated a residual fibrous connective tiseue and formed the barrier.

抄録全体を表示

In the dental clinic especially oral implantation or oral surgical operation, we are forced to or accidentally damage somewhere about Mandibular canal (Inferior alveolar nerve), Mandibular foramen, Mental foramen, Infraorbital foramen, Maxillary tuberosity,Greater palatine foramen and Incisive foramen. The sensory disturbances are occured by the damage of these nerves. The drug therapy which accelerate the resuscitation of nerve take the chief part in treating for those sensory damages. There is no therapy which has an rapid effect. We have to be looking to natural cure for sensory damages, but it take many time.
In my study, I made a comparison between drug therapy and acupuncture for sensory damage. The latter wes particularly better than the former for the rate of sensory damage recovery and healing the pain. Then I think, the application of acupuncture will be valuable therapy to treat the damage by oral implantation and oral surgical operation.

抄録全体を表示

When superstructures of dental implants are made,careful consideration is necessary when deciding how to connect them with the abutments of natural teeth.
Many researchers recommend the rigid-removable(the operator removable)superstructure for dental implants^1,2). These systems were utilized on 28 patients in the past 4 years with no complications.It is possible to do repairs, reduce occlusal stress,replace superstructures, and independently palpate implants with these superstructures. These systems can function as partial dentures with rigid-support after removal of implants.

抄録全体を表示