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Biomedical subjects

N S Javid

Publications and source records attributed to N S Javid.

At least 19 recordsLinked to original sources
PubMed1990

Biting strength and chewing forces in complete denture wearers.

Most studies concur that denture wearers have only about one fifth to one fourth the bite strength and masticatory force of natural dentition subjects. There appears to be a wide range of acceptable chewing forces, as evidenced by the wide variation in bite strength of natural dentition subjects. However, bite strength and masticatory forces in denture wearers fall below the natural dentition range and therefore it is concluded that denture wearers are handicapped in bite force. The occlusal form of the posterior denture teeth did not significantly influence masticatory force.

Analysis of Variance↗
PubMed1989

The effect of glutaraldehyde base disinfectants on denture base resins.

The effect of two alkaline glutaraldehyde base disinfectants on a heat-cured denture base resin was evaluated by the flexural strength, the repair flexural strength, and the surface morphology of the material that had been immersed up to 12 hours in the disinfecting solutions. The flexural strength of the material was not significantly affected by either disinfectant. The disinfectant with phenolic buffer caused surface pitting of the material after 10 minutes of immersion, and softening and swelling of the surface after 2 hours of immersion. No apparent surface change was observed with the regular alkaline formulation, however. Between the two repair resins, the autopolymerized resin yielded greater repair flexural strength than the light-cured repair resin. However, the repair flexural strength of autopolymerized resin seemed to be influenced by either disinfecting solution whereas the light-cured repair resin was not affected.

Acrylic Resins↗
PubMed1985

Three-dimensional analysis of maxillary denture displacement during reline impression procedure.

The contourmeter was used to determine quantitatively the denture displacements caused by various impression materials and techniques during the relining of a maxillary denture. This study indicated the following conclusions. Tissue-conditioning material used with closed-mouth impression technique or light-bodied polysulfide used with either open- or closed-mouth technique caused the least denture displacement in the three dimensions when compared with regular-bodied polysulfide or zinc oxide and eugenol impression materials. Comparing the same impression materials used with either open- or closed-mouth technique showed no significant difference in maxillary denture displacements. A relined complete denture should be remounted on the articulator and the occlusion refined to eliminate occlusal mismatches resulting from three-dimensional denture displacements during relining.

Dental Impression Materials↗
PubMed1984

The removable partial denture as a periodontal prosthesis.

Research has presented evidence to undermine the myth that the removable partial denture contributes to the progression of periodontal disease and is not suitable therapy for the treated periodontal patient. The properly designed removable partial denture for the periodontal patient can contribute to stability of mobile teeth and provide for an intact functional dentition. If the factors of plaque, pocket depth, transmitted forces to teeth, and tissue coverage are controlled by the therapist, it is conceivable that the result will yield long-term results by providing function with decreased expense, contingency for tooth loss, and prevention of full mouth extraction.

Biomechanical Phenomena↗
PubMed1982

The use of microfiche in testing clinical judgment.

This paper reports an investigation of the use of microfiche to replace other more bulky clinical materials in testing clinical judgment. Twenty-three students were administered two versions of tests of clinical judgment (micro-fiche and nonmicrofiche) regarding the treatment of partial edentulism. Each student served as both experimental subject and control. Results indicated that under the conditions of testing used, students preferred the nonmicrofiche version of the test. However, there was no significant difference in time of administration or grades resulting from the microfiche medium. Whether the test was given first or fourth in a series of five made a difference in time to take the test (p less than .01), and in the grade received (p less than .01). Tests taken in the first position took more time to complete and resulted in a higher grade. The rate of agreement in grading between the first and second grading session was 70 percent.

Clinical Competence↗
PubMed1976

Obturator design for hemimaxillectomy patients.

The retention and stability of the obturator for the patient who has had a hemimaxillectomy are major problems. A removable partial denture with a swing-lock retentive design system will provide retention and stability due to the continuous splinting of the remaining teeth during function and a passive multiple retentive-clasp system during relaxation. However, because of the danger of the possible orthodontic action of the swing-lock system, special care should be taken when using this kind of design, and the patient should be closely observed.

Denture Design↗
PubMed1975

The importance of the Hanau formula in construction of complete dentures.

The casts of five patients whose kinematic mandibular axes had been previously located and tatooed on the face were mounted on six articulators (two of Denar D4-A, two of Whip-Mix, and two of Hanau model 130-28). The horizontal and lateral condylar guidances of all articulators were adjusted by using 15 interocclusal records (five protrusive and 10 right and left lateral) made in cold-curing acrylic resin. The adjustments for each articulator were repeated 20 times within five days. The lateral condylar guidances as adjusted by the interocclusal records were compared with those established by Hanau's formula. A significant difference in the means of the condylar readings occurred when the Hanau articulator was adjusted with a lateral interocclusal record and the Hanau formula. The range of means of lateral condylar guidances of Hanau articulators using the Hanau formula was small. This small possibility of variation in the lateral condylar guidance would suggest the use of lateral interocclusal records when precise restorative procedures are necessary. The Hanau formula is the only formula available at this time to determine the average lateral condylar guidance as related to the horizontal condylar guidance.

Dental Equipment↗