Study on High-strength Plastic Teeth. Tooth Discoloration.

Abstract

Conventionalplastic teeth (CV teeth) are inferior to porcelain teeth in maintaining an adequate esthetic appearance with wear and discoloration, and thus have a shorter period of durability.Recently, high-strength plastic teeth (HS teeth) have been developed and applied to overcome the wear problems of CV teeth. Since HS teeth made of hard resin are still susceptible to staining with pigments, it has been observed that the esthetics of removable partial dentures made from such plastic teeth are gradually impaired in many patients.To investigate the susceptibility of HS teeth to pigments, we conducted an in vitro study by immersing three types of artificial teeth in three coloring liquids.It was found that the HS teeth tended to be less susceptible to the test pigments than the CV teeth to various degrees. In contrast, they showed markedly stronger susceptibility to the pigments than porcelain teeth. For all three artificial tooth types, daily tooth cleaning with an ultrasonic vibrator had a tendency to reduce the coloration in comparison with their counterparts without ultrasonic cleaning.

Color Stability of Different Denture Teeth Materials against Various Staining Agents

“…This result was consistent with the studies of Satoh et al 2) , Mutlu-Sagesen et al 3) , and Belli et al 25) . This could be explained by the water sorption property of acrylic materials.…”

“…A period of four weeks' immersion might be considered by some as too long an experimental period. However; in most in vitro studies 2,3,7,13,26,27,28) , the final period is typically four weeks or more in order to achieve a cumulative staining effect and obtain distinct results. One of the drawbacks in the present investigation might be related with the methodology utilized for the staining procedure.…”

“…On the downside, conventional acrylic teeth are inferior to porcelain teeth in maintaining an adequate esthetic appearance with wear and discoloration, and thus have a shorter durability period and service life. To overcome the wear problems of conventional plastic teeth, high-strength plastic teeth have since been developed and applied clinically 2) . Since high-strength plastic teeth made of hard resin are still susceptible to staining with pigments, it has been observed that the esthetics of removable partial dentures made from such plastic teeth is gradually impaired in many patients 2) .…”

“…To overcome the wear problems of conventional plastic teeth, high-strength plastic teeth have since been developed and applied clinically 2) . Since high-strength plastic teeth made of hard resin are still susceptible to staining with pigments, it has been observed that the esthetics of removable partial dentures made from such plastic teeth is gradually impaired in many patients 2) . On the other hand, porcelain teeth are comparatively superior because of their high wear resistance and good esthetical appearance.…”

A Comparative Study of Heat and Self-Cured Acrylic Resins on Color Stability of 5 Brands of Denture Teeth

“…Selection of color-stable and resistant dental material results in higher aesthetic value and resistance to staining (5,6). Ceramic teeth have generally been replaced by composite teeth, and despite better mechanical properties the prostheses fabricated by these teeth will have some degree of discoloration over time (7). Some changes in denture base resin structure and different procedures for fabricating complete dentures have attempted to improve their mechanical properties.…”