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Biomedical subjects

A Zissis

Publications and source records attributed to A Zissis.

8 recordsLinked to original sources
PubMed1992

Dimensional accuracy and stability of acrylic resin denture bases.

Proponents of injection molding systems have claimed a number of benefits over conventional press-pack dough molding systems. The aim of this study was to evaluate a recently developed injection (dry heat) procedure of processing compared with press-pack dough molding utilizing three curing cycles. The dimensional accuracy and stability of acrylic resin bases produced by the two molding procedures were compared. Dimensional changes were assessed over a period of 4 months using an optical comparator. The results demonstrate that baseplates produced by the injection molding procedure exhibit less shrinkage than those produced by the conventional press-pack procedures.

Acrylic Resins↗
PubMed1991

Measurement methods used for the determination of dimensional accuracy and stability of denture base materials.

The literature relating to methods of measurement of dimensional accuracy and stability of denture base materials is reviewed. The papers are presented chronologically together with information on the measurement technique used and the reported level of accuracy. Most authors utilized optical measuring apparatus, with the use of calipers being the second most popular method.

Dental Materials↗
PubMedDate not supplied

Measurements of dimensional accuracy using linear and scanning profile techniques.

Various measurement methods have been described for the determination of dimensional accuracy and stability of denture base materials. This investigation introduces a computerised coordinate measuring machine (CCMM) and compares it with two methods routinely used for assessment of the accuracy of fit of denture base materials. The results demonstrate that the three methods (digital calipers, optical comparator, and CCMM) are acceptable for linear measurement. The CCMM was also used in its scanning mode to define and to quantify the contour changes of the resin bases. The advantages of the CCMM become apparent when two-dimensional changes require assessment.

Acrylic Resins↗
PubMedDate not supplied

[Width relationship between upper and lower anterior teeth].

This study deals with the relationship which exists between upper and lower anterior teeth. Measurements for the width of the upper central incisor, six upper anterior teeth and the six lower anterior teeth were drawn from 98 couple of casts taken from 50 female and 48 male age range 22-27 years old. Our results showed: A) A significant statistical difference exists between male and female regarding the width of upper and lower anterior teeth. B) There is no a statistical significant difference between these two groups regarding the width of the upper central incisor. C) There exists a relationship of 1.3 between upper and lower teeth. D) A relationship of 6.1 between upper anterior teeth to central upper incisor. E) A relationship of 4.7 between lower anterior teeth to upper central incisor.

Adult↗