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ISSN (Print) 1013-9052
EISSN 1658-3558
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16. Experimental use of stronium chloride as a capping material: i. antibacterial activity
Mona I. Riad,
Faculty of Dentistry, Cairo University, Cairo, Egypt.
Stronium chloride (StCI2) has proved to be quite useful for the treatment of sensitive teeth which frequently follows abrasion, erosion and attrition. The antimicrobial activity, sensitivity and pH ofStCI2 were evaluated for the promising use of this material in dental practice. An in vitro study of the inhibitory effect of StCI2 and calcium hydroxide (Ca(OH)2) on microbial samples collected from deep carious lesions of 12 human carious molars. The fragmented carious specimens were innoculated to tryptic soy broth for 24 hours. From the turbid broth, one loopful was transferred to tryptic soy agar with 5% cheep blood and another loopful to chocolate agar. Uniform disks of each material, separately and in combination, were prepared and transferred to the agar plates. After 24 hours, zones of bacterial inhibition were measured. Culture and sensitivity test and identification of the causative organisms were carried out. pH of each material was determined in different concentrations and ratios to measure the effectiveness of StCI2 as a capping material.
The results showed that StCI2, in combination with Ca(OH)2 in pH (20% concentration, 1/4 to 1 ratio), was more advantageous than each material separately. In addition, its sensitivity showed improvement in its capability to resist the microbial action of the causative organisms.
Saudi Dental Journal 1992;4(SI)-Abstr.16:p17.
17. Experimental investigation of gingival discoloration occurring after restorative dentistry
Moustafa Darwish,
Zahnarzt, Sterntorhaus, Oxfordstrabe 21, 5300 Bonn 1, Republic of Germany.
With the increased use of non-precious dental casting alloys as substitute for semi-precious and precious gold alloys in restorative dentistry, an increase of gingival discoloration after crown and bridgework can be observed. It is generally excepted that, mainly, the effects of corrosion lead to this tissue change, in order to prove this thesis, an investigation was undertaken to show the presence of products of corrosion of different dental materials in discolored gingival tissue. The energy dispersive X-ray microanalysis on histologic sections of gingival tissue used in this study helps to qualify and quantify different types of metal ions and corrosion products.
The different factors determining corrosion especially under clinical conditions are demonstrated and discussed in the light of new research and recent personal studies.
Saudi Dental Journal 1992;4(SI)-Abstr.17:p18.
18. Wear rates of posterior composite resin restorations
Faten Kamel, H. Nahed, K. Al-Saif,
Department of Restorative Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
The purpose of this study was to determine the wear rates of different posterior composite resin restorations in class I cavities. Conservative class I cavities were prepared in 32 freshly extracted human molar teeth. The teeth were divided into eight groups and restored with the following materials: Concise (c), Adaptic (a), Fulfill (F), Quantum PAC (QP), Occlusin (O), Estilux Posterior (EP), P10 and P50. The specimens were stored in distilled water for 24 hours at room temperature then subjected to mechanical stress for 200,000 cycles using the fatigue stress apparatus at a rate of one stroke/0.6 sec and a force of 55 N.
During the study, the specimens were thermocycled at temperatures between 5°C and 65°C. The amount of wear was measured after 50,000, 100,000, and 200,000 cycles using the M. L. scale and the mean value was taken for each group. Reprosil impression of the specimens were made and replicas poured using Epo-kwick resin, then the replicas were sputter-coated and examined using the scanning electron microscope. The amount of wear measured for the materials after 50,000, 100,000 and 200,000 cycles were as follows: P50 (35M, 50M, 67.5M), F(75M, 112.5M), A (1 50M, 1 75M, 200M), QP(87.5M, 112.5M, 137M), EP (67.5M, 100M, 150M), P,0 (75M, 87.5M, 100M). SEM examination revealed that P50 showed the minimum degree of wear, while A presented the maximum.
Saudi Dental Journal 1992;4(SI)-Abstr.18:p19.
19. Evaluation of two different techniques for the removal of fluorosis stains: in vivo and in vitro studies
Abdul Hamid Rahmatulla,
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
An in vivo study to evaluate the removal of fluorosis stains from human enamel surfaces by the application of modified Mclnnes solution with pumice and also by the application of 18% HCI with pumice. The aims of the study were: (i) to study the extent of the removal of the fluorosis stains from the enamel surfaces; (ii) to observe the extent of pulpal reactions, if any; and (iii) to compare the efficaciousness of the application of the 18% HCI with pumice. Twenty human subjects, with varying number and degrees of stained teeth, were treated.
An in vitro study was also conducted to measure the enamel microabrasion by the application of 18% HCI with pumice. The purpose of the present study were: (i) to develop a method for measuring the microabrasion of the enamel by the applications of these solutions individually; (ii) to measure the amount of enamel lost during successive applications of these solutions individually; and (iii) to compare the efficaciousness of these solutions.
Saudi Dental Journal 1992;4(SI)-Abstr.19:p20.
20. Endo-perio inter-relationship
Nahed Ashri, Mahmoud EIDeeb,
Department of Preventive Dental Sciences, College of Dentistry, King Saud University, P.O. Box60169, Riyadh 11545, Saudi Arabia.
The close relationship between the pulp and periodontium in both health and disease has long been documented in the dental literature. With such a close ralationship present, it is no wonder that differential diagnosis is frequently confusing. Since correct diagnosis is essential for successful treatment, it is important to be able to differentiate between signs and symptoms of endodontic and/or periodontic lesions.
The purpose of this presentation is to show how pulpal and periodontal disease interrelate, as well as the avenues of communication. Clinical cases will be shown to illustrate the classification of endo-perio lesions. The presentation will focus on proper diagnostic procedures as well as the sequence of treatment.
Saudi Dental Journal 1992;4(SI)-Abstr.20:p21. |