|
51. The effect of opaque porcelain surface texture on the color of ceramometal complexes
lhab Adel Hammad,
Department of Restorative Dental Sciences, College of Dentistry, King Saud University, P. O. Box 60169, Riyadh 11545, Saudi Arabia.
This investigation, using a sophisticated colorimeter (MinoltaRCR 121), was designed to study and evaluate the effect of opaque porcelain surface texture on the color of ceramometal complexes. Various opaque surface textures were obtained by changing the firing temperature. Surface evaluation was performed using a scanning electron microscope (SEM) and a topographical surface analyzer. Two brands of porcelain and two types of alloys were chosen based on their widespread clinical use and the marked contrast between them. The effect of changing the opaque porcelain surface texture (firing temperature) had varying effects on color relative to brand of porcelain and specific alloy. The data obtained were expressed in CIE terminology and were converted to Munsell notation for Hue, Value and Chrome.
Statistical analysis showed a significant change in Hue and Value (P < 0.00) by changing the opaque porcelain surface texture. However, chroma was not significantly altered.
Saudi Dental Journal 1992;4(SI)-Abstr.51:p52.
52. A comparative study of facebow transfer on hanau and whip-mix articulator
M. Aleem Abdullah, H. Sherfudhin,
Department of Prosthodontic Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia
Facebow transfer relates the maxillary cast in three dimensional relationship to all the condylar movements. It is base line from which all occlusal relationship starts. Studies have shown that the relationship of the planes of reference are not maintained in transfer from patient to the articulator because the anterior their point of reference orbitale is not represented correctly on the anticulator. As a result of which facebow incorrectly positions the maxillary cast in a vertical plane. The orbitale on Hanau 158-H2 articulator and Whip-mix articulator is differently represented. In this study, the anteroposterior inclination of the occlusal plane of the maxillary cast transferred on the Hanau 158-H2 articulator by Hanau earpiece facebow 159-4 is compared to those transferred on Whip-Mix articulator by Quick Mount facebow. A solution for acurate mounting of the maxillary cast on the Whip-Mix articulator is presented.
Saudi Dental Journal 1992;4(SI)-Abstr.52:p53.
53. Treatment of gingival recession
Nouf Al Hamad, M. Eid,
Department of Preventive Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60/69, Riyadh 11545, Saudi Arabia.
Inflammatory periodontal disease coupled with incorrect toothbrushing frequently results in gingival recession and root exposure. In the past, treatment of these lesions consisted of repeated gingival curretage in an attempt to contain the recession. Subsequently, therapy was directed towards the reconstruction of an adequate zone of attached gingiva with simultaneous deepening of the vestibule using the apically repositioned flap.
Today, gingival transplantation techniques, such as the pedicle graft and the free gingival graft, have gained wide acceptance among clinicians and are becoming a more predictable therapeutic expectation.
In light of the constantly expanding body of knowledge concerning mucogingival problems, this presentation will review the most recent information on gingival transplantation techniques and demonstrate their "predictability" in covering denuded root surfaces.
Current research findings as well as clinical cases will be presented showing, for each procedure, its indications and contraindications, its relative strengths and weaknesses and the therapeutic endpoint of success.
Saudi Dental Journal 1992;4(SI)-Abstr.53:p54.
54. Emergency treatment of acute periodontal diseases
Fatin Awartani, M. Eid,
Department of Preventive Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
In both clinical and pathological sense, most periodontal diseases are chronic in nature. They take a long time to develop, follow a slow insidious course and frequently do not cause pain or other symptoms until the terminal stages are reached.
Acute periodontal diseases, on the other hand, are comparatively unusual but by no means rare. Clinically, they develop rapidly, follow an aggressive course, and can be quite painful.
Acute periodontal diseases, therefore, should be handled immediately. This entails a succinct clinical and radiographic examination and the alleviation of the acute symptoms.
Effective periodontal therapy can only be achieved with proper knowledge and understanding of the clinical signs and symptoms of these diseases.
This presentation will describe various examples of emergency periodontal situations and treatment most commonly encountered, including opening of acute periodontal abscess and topical or mechanical therapy in cases of necrotizing ulcerative gingivitis.
Clinical cases will be presented with emphasis on diagnostic criteria and the different treatment modalities.
Saudi Dental Journal 1992;4(SI)-Abstr.54:p55.
55. Guided tissue regeneration technique in periodontal surgery
Ibtessam Al-Dallal,
Ministry of Health, P.O. Box 42, Bahrain.
The use of guided tissue regeneration technique is presented. The biological principles of periodontal tissue repair and ita behavior is discussed in addition to the clinical application which involves the selection of cases and the surgical procedures.
The post-operative consideration and the criteria for success is highlighted.
Saudi Dental Journal 1992;4(SI)-Abstr.55:p56.
|