Full Denture Construction Research Articles

LASERS IN PROSTHODONTICS

Laser treatment in periodontal and oral surgery and in other disciplines in dentistry has replaced many traditional electrosurgical and scalpel procedures and is beginning to replace the dental handpiece. The successful construction of removable full and partial dentures mainly depends on the preoperative evaluation of the supporting hard and soft tissue structures and their proper preparation. Lasers may now be used to perform most preprosthetic surgeries. These procedures include hard and soft tissue tuberosity reduction, torus removal, treatment of unsuitable residual ridges including undercut and irregularly resorbed ridges, treatment of unsupported soft tissues, and other hard and soft tissue abnormalities. Stability, retention, function, and esthetics of removable prostheses may be enhanced by proper laser manipulation of the soft tissues and underlying osseous structure.

総義歯における前歯部排列の一考察

総義歯における前歯部排列の一考察

The speaking method in measuring vertical dimension

Abstract The speaking method of measuring vertical dimension is a physiologic phonetic method which measures vertical dimension by means of the closest speaking space. This space is measured before the loss of the remaining natural teeth to give us the patient's natural vertical dimension which can be recorded and used at later dates. The same closest speaking space should be reproduced in full dentures as is found in the natural dentition. This space is also the means of proving that vertical dimension must not be increased. It is advisable to measure and record the closest speaking space of all patients after they are past 20 years of age, for possible use in later years. For example, if we should feel that a certain patient might need occlusal reconstruction the measurement of the closest speaking space can be made which can be compared to the space existing in earlier years. If this space should be larger during later years in life, it could be assumed that the vertical dimension was decreased, and treatment needed to increase the vertical dimension with occlusal reconstruction. This is an assumption based on the hope and feeling that the speaking method with its closest speaking space will prove constant throughout life, as records seem to indicate at the present time. The measurement of vertical dimension by use of the speaking method with its closest speaking space has been found in my experience to be the missing link in successful full denture construction. It will prove most valuable to dentists doing occlusal reconstruction and to periodontists in the treatment of their patients.

Radiological findings in 1135 edentulous patients.

A sample consisting of 1135 edentulous patients with clinically healthy denture bearing areas, was examined radiologically. It appears that the diagnostic yield is high whereas the expected radiation induced risk is low. Patients should therefore be examined radiologically prior to full denture construction.

Occlusal rims for full denture construction formed according to anatomical landmarks : Hatzistavros K., Sofou E. et al. (1985) Hellen. Stornatol, Chron.29, 5–9

Occlusal rims for full denture construction formed according to anatomical landmarks : Hatzistavros K., Sofou E. et al. (1985) Hellen. Stornatol, Chron.29, 5–9

調製過程における総義歯の三次元的寸法変化 Ｉ 人工歯の変位量および義歯床の形状変化について

In this study, the authers set-up the origin and coordinate axes outside of the denture and working cast, and measure the displacements of teeth and deformations of surface contoures during process of full denture construction using heat-curing resin (Acron and Lucitone 199).The conclusions are follows:1. Displacements of teeth1) Horizontal directionIn all dentures, the teeth displace toward inside and forward after cured. The displacement of posterior is larger than the anterior.2) Vertical directionIn all dentures, the teeth displace toward occlusal surface. In upper dentures, the displacement of posterior is larger than the anterior, and in lower dentures, it's relation is conversely. After removed from the cast, the displacement is larger than before.2. Deformations of polished surface contoures (in upper denture)In all dentures, the polished surface deformes upward after cured. The deformations in center of palate and posterior border are larger than the others. After removed from the cast, particulary in case of Acron, the polished surface deformes upward more than before.

A simplified technique for determining the occlusal plane in full denture construction.

Because of difficulties encountered by students in determining the occlusal plane at the registration stage of full denture treatment, a simple technique which can be easily taught has been devised. Review of literature revealed a wide variety of landmarks and techniques advocated by various authorities and these are discussed. A technique using direct vision is described and a review of a series of patients showed it to be valid for the majority of cases.

坪根式バイトゲージの特徴と使用法について

Determination and confirmation of vertical jaw relation (vertical dimension) at the time of full denture construction prosthesis is one of the most difficult steps. As a device for recording vertical jaw relation, the Tsubone's bite gauge has been in use at our clinic and good results have been obtained. The characteristics and usage of the Tsubone's bite gauge have been described in the present paper and examination has been made of the vertical jaw distance of individual normal occlusion and the measurement taken of the parts, deemed to be related, of the body. The examination indicated that the measurements were approximately the same for subnasal point-submental region distance at mandibular rest position, pupil line-oral fissure distance, and the left index finger length. The measurements did not vary much when they were taken by one and the same operator. The measurements however varied among different operators. Therefore, care must be taken on this respect in using the Tsubone's bite gauge.

Time and methods used for complete denture construction by dental students and general dental practitioners in Great Britain in 1972

A survey was conducted to assess whether there were any differences in the clinical methods employed in constructing full dentures by dentists and final year dental students. Students at twelve British dental schools and dentists who graduated between 1956 and 1970 were surveyed. Students took about 4 1 2 hours spaced over 5–6 visits whilst dentists took 68·4 minutes over 4 appointments to complete a set of dentures. Over 90 per cent of dentists did a preliminary examination, one impression, adjustment of bite, try-in and final fit for 90 per cent or more of their full denture cases. Only 47·8 per cent generally took preliminary impressions and 30·4 per cent usually did border moulding. Facebows and gothic arch tracings were not frequently carried out by dentists. A small number of dentists appeared to allow their technicians to do procedures in the mouth. Students generally did all steps in denture construction and had to do the laboratory work in at least one case. They had to complete 3 cases at one dental school and as many as 20 at another. Twenty-two per cent of dentists said that of all their undergraduate subjects, they were best prepared in full denture construction by their dental undergraduate course; less than 5 per cent of students had that opinion. The majority of dentists and students would like the same amount of instruction in full dentures (75 per cent of dentists and 70 per cent of students); only 6·6 per cent of dentists wanted less teaching in the subject. There were differences between the time taken and number of stages employed by students and practitioners. If teachers are convinced of the usefulness of the procedures that they teach they should teach them with greater conviction.

Studies of mandibular movements in speech

A method of transducing mandibular movements in speech using synchro-transmitters is described. Incisal occlusion was shown to have an important part to play in the amount and direction of jaw movement. Mandibular positions were shown to be precise and repeatable, especially for the 's' sound. Insertion of intra-oral appliances of varying dimensions did not have a significant effect on this positional precision. It is anticipated that the precision of vertical dimension determination during full denture construction will not be influenced by the dimensions of the intra-oral appliances.

Relationship of the maxillary central incisors and canines to the incisive papilla

Four hundred and thirty dentulous casts in normal alignment and Angle's Class I Relationship were examined. The results indicated a relationship between arch shape and the incisive papilla. The suggestion is made that in the preliminary location of the anterior teeth during construction of full dentures, the average distance of incisors and canines from the incisive papilla could be used as starting points.

Criteria for Selecting an Articulator to Occlude and Articulate Teeth for Full Denture Construction

Criteria for Selecting an Articulator to Occlude and Articulate Teeth for Full Denture Construction

Some problems associated with construction of full dentures

Some problems associated with construction of full dentures

Physics of mandibular movement related to full denture construction

The physical terms used in relation to mandibular movement were explained. The differences between the resultants of functional and nonfunctional mandibular movements were compared and found to be dissimilar. A working model, devised by Boswell, was explained to show the differences that occlusal pitch made in stability of the lower denture. The physics involved in functional mandibular movement should be basis for the occlusal surfaces of the posterior teeth used in full denture construction rather than the acceptance of an idealized occlusion based on nonfunctional movements.

Construction of full dentures with balanced functional occlusion

Construction of full dentures with balanced functional occlusion

The functionally generated path in full denture construction

The functionally generated path in full denture construction

Trouble shooting in full denture construction

Trouble shooting in full denture construction

Fundamental principles of full denture construction

Fundamental principles of full denture construction

The role of periodontia in prosthetic dentistry

tions correctly. This applies to all phases of prosthetic dentistry, viz., bridge, partial, and full denture construction. When a patient with periodontal involvement presents himself, the dentist who has had proper periodontal training is able to make his diagnosis, or analysis of the case ; his prognosis, or prediction of the results which will be obtained ; and his recommendations for procedure with the sincere feeling of certainty that he is doing the best thing possible for that patient. He will be less hasty in advising the removal of involved teeth, and will consequently save more teeth than he had before felt possible. In short, he will be giving his patients better service and better dentistry. Consider then, the condition of the gingival tissues in cases of periodontal involvement. These gingival tissues are inflamed, and the degree of inflammation may vary clinically from acute to subactite, or to chronic. It is quite generally accepted that wherever inflammation of soft tissue exists, there is also a degree of inflammation and resultant resorption in the immediately adjacent bony structures. Thus, rheumatic patients exhibit resorption in the bone of the joints which are inflamed. Also, a simple fracture of a long bone will, within a week after the fracture, show radiographic evidence of marked resorption of each end of the fracture. Leriche and Policard’ state that rarefaction and resorption of the fragments of a fracture begin immediately after the trauma, and progress to such a degree that after seven or eight days exact anatomic coaptation of the fracture is most difficult. They further state that such resorption is manifested by enlargement of the Haversian canals and of the connective tissue spaces. The bone disappears by osteoclasis (osteoclastic resorption), much more than by osteolysis (chemical absorption), and as the circulatory conditions return to normal, the rarifaction ceases. Weinmann and Sicher’ report that necrosis of bone is always found at the frac

The torus palatinus and its management in full denture construction

The torus palatinus and its management in full denture construction