Determination of uranium content in dental porcelains by means of the fission track method and estimation of radiation dose to oral mucosa by radioactive elements.
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Alpha Particles↗
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Results for “TOOTH, ARTIFICIAL”
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Loss of ridge width and the single tooth implant: clinical report.
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Adult↗
High lip line, gingival contouring, and single tooth implants: clinical report.
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Adult↗
Mechanical tooth concepts in implant dentistry.
A brief history of mechanical tooth concepts is presented with an update and discussion of the three basic categories of designs presently available. The application of mechanical designs to implant dentistry is covered with a discussion of indications, contraindications, and technical requirements for each of the categories.
Composite Resins↗
Flap design considerations in the placement of single maxillary anterior implants: clinical report.
Existing flap designs can be modified to improve esthetics in resorbed anterior maxillary edentulous areas when single implants are treatment planned. A clinical report is presented.
Adult↗
Angulation assessment of anterior single tooth root form implants: technical note.
A technique is presented to evaluate the angulation and position of an anterior single tooth root form implant by means of a surgical template, a pilot osteotomy, and an abutment guide. The space available for the restorative materials can be assessed and the angulation modified, if necessary, to improve the esthetic potential. If the angulation is satisfactory and sufficient room is available for the prosthesis, the surgeon can continue with implant placement at the initial site.
Cuspid↗
Vertical dimension of occlusion in implant dentistry: significance and approach.
Understanding the principles of occlusion as they relate to managing bite forces on implants is extremely important to maintain the longevity of dental implant prostheses. Specifically, altering vertical dimension of occlusion (VDO) scientifically and predictably is critical to the creation of proper tooth form and guidance when fabricating a full-arch implant-supported prosthesis.
Aged↗
Immediate implant in extraction socket with acellular dermal matrix graft and bioactive glass: a case report.
A buccal plate destroyed as a result of a longitudinal root fracture was completely restored by the use of a Frialit-2 implant placed in the alveolus of the fractured maxillary left first bicuspid. An acellular dermal matrix material was used as a membrane barrier to cover the implant, and a bioactive glass was used as grafting material. After 6 months, the defect around the implant was completely filled by mineralized tissue.
Adult↗
Measuring mobility of 2 dental implant fixtures of different configurations: an in vitro study.
OBJECTIVES: To our knowledge, it has not as yet been determined if mini-dental implants can be used as a long-term treatment method compared to endosseous standard root-form dental implant fixtures. This in vitro study investigates the stability of 2 different implants, 1 mini-dental implant and 1 endosseous standard root form dental implant, under lateral forces. METHODS: There were 2 different screw-type dental implants with the O-ring/ball attachment prosthetic heads used. A mini-dental implant (Sendax MDI MAX; IMTEC, Corp., Ardmore, OK) 13 mm in length and 2.2 mm in diameter, and root form implant (Brånemark; Nobel Biocare AB, Goteborg, Sweden) 13 mm in length and 4 mm in diameter. These implants were then embedded into a matrix mixture of pumice, two-fifths BaSO4 powder and one-fifth plaster. Parallel periapical radiographs were taken pretest and after lateral forces were applied. The implants were vibrated using electric toothbrushes. They were attached to O-rings on the implants. Periapical radiographs were secured periodically every 5 minutes. The first discrepancy was observed at the 35th minute. Mobility and discrepancy values were recorded at the instances of 35th, 60th, 90th, and 120th minutes. Stability was measured and recorded using a manual stress and tension gauge. Radiographic discrepancy values were measured using a stereomicroscope. RESULTS: The Brånemark implant showed less mobility and discrepancy values than the mini-dental implant. The discrepancies were observed mostly at the cervical region of the 2 implants. CONCLUSIONS: According to the experimental results of this study, the Brånemark implant was more stable than the mini-dental implant at the end of 2 minutes.
Dental Implants↗
Diagnosis of the aesthetic components of the mandibular anterior prosthesis.
This paper explores seven different factors which should be considered when prescribing the lower anterior prosthesis: alignment as seen from the incisal; height of the incisal edges; degree of irregularity of the teeth; character of the incisal edge; height of the cuspid; mesio-incisal angle of the cuspid; and ridge coverage. The weights and variations of these different factors are discussed and suggestions made for a complete work authorization.
Cuspid↗
Denture aesthetics: an evaluation of laymen's preferences.
The purpose of this study was to evaluate whether the lay public perceives anterior teeth selected by William's typal matching method as aesthetically pleasing. The theory was tested by laymen responding to questions about photographs of three edentulous male and three edentulous female patients. These patients were selected as representatives of square, tapering, and ovoid facial forms. The photographs were portrait views of the patients wearing different dentures displaying square, tapering, and ovoid teeth. Substantiation for typal match was found in the square female, square male, and the ovoid female patients. Responses to the photographs demonstrated a preference for square tooth forms over ovoid, and then tapering. Overall, ovoid teeth were preferred for females and square teeth were preferred for males.
Attitude↗
An evaluation of crowns and bridges in a general dental practice.
In this article the results are presented of an evaluation of crowns and bridges in a general practice. The study includes 601 solitary crowns, 213 crowns on bridge abutments and 103 crowns on RPD abutments. In total eighty-four bridges were examined. All these restorations were constructed during a period of 11.5 years. By means of the Kaplan-Meier method a prognosis is given of the life span of the different solitary crown-types over periods between 1 and 11 years. The total amount of failures and follow-up treatments on bridge and RPD abutments was very small. The authors also examined whether the bridges were constructed according Ante's law. A follow-up of this study in other Dutch general practices in combination with experimental clinical trials is under way.
Adult↗
Occlusal interferences analysed in patients treated with fixed prosthesis four years earlier.
This study consists of 147 subjects treated with fixed prostheses 4 years previously. Occlusal analyses were made, and the fillings, crowns, and pontics on the occlusal surfaces were recorded. Occlusal interferences were found in 42.6% of the fillings, in 34.9% of the crowns, in 27.0% of the pontics, and in 24.6% of the intact surfaces. The most common interference types were intercuspidation, retrusion and mediotrusion in the fillings, as well as intercuspidation, retrusion, and laterotrusion interferences in the crowns. In pontics interferences appeared mostly in intercuspidation and retrusion. When adjustment was made for preprosthetic occlusion, the number of interferences on all types of occlusal surfaces considerably decreased.
Crowns↗
A biometric comparison of face shape with denture tooth form.
Dentist and patient preferences are often used to select replacement teeth in prosthodontics. Face shape compared with inverted tooth form classifications based on Leon William's work are currently used. Shapes of teeth and faces have been referred to as square, ovoid or tapered, or some combination of these. Six patients, three male and three female, were selected as being classically square, tapered or ovoid in facial form. Three sets of dentures had been made for each patient with tapering, ovoid and square denture teeth. Using a standardized photographic technique, full face views with profiles and close-ups of the teeth were taken. Then from standardized enlarged tracings, key anatomic and derived points were marked, digitized and computer analysed. The face shapes and inverted tooth forms were digitized in the same manner. A comparison of tooth moulds versus the actual denture teeth shows a highly significant difference (P less than 0.001) between set and unset denture teeth. There is also a significant difference (P less than 0.001) between facial form and denture teeth using temporal zygomatic and gonial widths for faces, compared with incisal, contact, and cervical widths for the teeth.
Denture Design↗
The value of the Gothic arch tracing in the positioning of denture teeth.
Twenty-five subjects of three nationalities carried out Gothic arch tracings. Measurements between the side arms were compared with the upper intercuspid distances measured in the same subjects. A relationship was found which may be of value in the setting up of anterior maxillary denture teeth.
Adult↗
Complete mandibular denture stability when posterior teeth are placed over a basal tissue incline.
Six patients with previous denture experience were provided with new dentures. Metal indicators were placed on either side of the mandibular denture and a cobalt-chromium alloy marker was inserted in the left bucco-posterior area of the mandible in each case. In the new dentures posterior teeth were positioned up to the retro-molar pad, over the basal tissue slope of the posterior mandibular alveolar ridge. After habituation had taken place, a cineradiographic recording was made of chewing. Prior to the second recording the mandibular teeth were removed to a point where the remaining teeth were not over inclined residual alveolar ridges. Denture movement was observed by measuring the distances between the markers on an analytical projector. The results show a significant difference between the cranial values of the two chewing experiences. Values for all denture movements were less after removal of the teeth over an incline. These results support the clinical observation that teeth placed over a basal tissue incline have a destabilizing effect during complete mandibular denture function.
Adult↗
Front tooth replacement with Tübingen (Frialit) implants.
127 Tübingen (Frialit) implants have been clinically evaluated for a 10 year period. The implants were placed in the anterior region of the maxillae of 101 patients to replace lost incisors, cuspids and premolars. Seventy-seven implants were placed within 3 months after loss of a natural anterior tooth, resulting in the preservation of the volume of the alveolar ridge and the contour of the surrounding soft tissues. This preservation of the volume of the alveolar ridge was due to the fact that the Tübingen implants have conical shapes and sizes, equal to those of the roots of natural teeth. The dentine-like colour and the biological properties of the bio-inert Al2O3 implant-material, in most of the cases was an advantage to the aesthetics of the prosthetic restorations and to the condition of the soft tissues in the permucosal area. The Tübingen implant is placed with a one-phase technique implying special care for the temporary restorations to avoid premature loading. Also prevention of overloading the ceramic material by the fixed restoration needs special attention in the construction of posts, cores and crowns. The overall survival-rate in this study with a mean follow-up of 4.5 years was 87%. Patient and dentist satisfaction was high.
Adolescent↗
Surgical and prosthodontic training of general practitioners for single tooth implants: a study of treatments performed at four general practitioners' offices and at a specialist clinic after 2 years.
Both the surgical and the prosthodontic procedures will be performed by one and the same general practitioner (GP) for many implant patients, as access to specialists is limited or non-existent in a large number of places. However, treatment by GPs has not been documented to the same extent as treatment performed by specialists. This lack of knowledge was the reason for the present study, in which four GPs performed both the surgery and the prosthodontics on patients requiring single tooth implant replacements. The treatments were performed after an initial training of the GP and his/her dental assistant for 8 days. The treatments by the GPs exhibited clinical results corresponding to those achieved at a specialist clinic. The outcome indicates that complete single tooth implant treatments might be performed by GPs who have passed an initial training and demonstrated an interest in a close co-operation with specialists in oral surgery/periodontics and prosthodontics. Such a co-operation should be based on the distribution of complicated cases to the specialists and of non-complicated cases to the GPs.
Adolescent↗