EFFECTS OF DIFFERENT POLISHING METHODS ON THE COLOR STABILITY OF PORCELAIN: AN IN-VITRO STUDY

Faiza M. Abo-Reem; Ibrahim Zaid Al-Shami; Mohsen Ali Al-Hamzi; Amani Hussein Y Al-hamzi; Hassan Abdulwahab Al-Shamahy

doi:10.22270/ujpr.v8i4.971

Faiza M. Abo-Reem Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Sana’a University, Republic of Yemen.
Ibrahim Zaid Al-Shami Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Sana’a University, Republic of Yemen.
Mohsen Ali Al-Hamzi Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Sana’a University, Republic of Yemen. Department of Basic Sciences, Faculty of Dentistry, Sana’a University, Republic of Yemen.
Amani Hussein Y Al-hamzi Medical Microbiology department, Faculty of Medicine, Genius University for Sciences and Technology, Dhamar city, Republic of Yemen.
Hassan Abdulwahab Al-Shamahy Medical Microbiology Department, Faculty of Medicine, Genius University for Sciences and Technology, Dhamar city, Republic of Yemen.

10.22270/ujpr.v8i4.971

Keywords:

Color stability, polishing methods, porcelain material, staining media

Abstract

Background and aim: As a result, an ongoing study is required to determine the effect of different polishing methods on the color stability of feldspathic porcelain surfaces exposed to four staining solutions at different time intervals in order to determine the most appropriate polishing method that results in better color stability for long periods, which was the goal of this study.

Material and methods: This in-vitro study included 80 disc-shaped feldspathic porcelain specimens which were self-fabricated, all the specimens were auto glazed to close any pores, then randomly divided into 4 equal groups of 20 specimens. Specimens of the unpolished group (control group) underwent a removal of their glaze layer, another group was untreated (auto glazed), whereas the other two groups were prepared based on two polishing systems (over-glazed and polished). Specimens of each group (n=20) were divided into 4 groups (n=5) to be immersed in 4 staining solutions (distilled water as a control group, prepared khat extract, prepared red tea, Delsi soft drink). The color measurement of each specimen was assessed before immersion and after 1, 7 and 14 days of immersion.

Results: The interaction between unpolished porcelain surfaces and khat extract or red tea showed significant higher increase in color change over time (p<0.05), whereas their interaction with Pepsi or distilled water showed no significant differences (p> 0.05). The interaction between over glazed or auto glazed porcelain surfaces and each stain showed no significant differences over time (p>0.05).

Conclusion: Time plays an important role in the discoloration of feldspathic porcelain. Khat has the highest staining ability followed by red tea; however, Pepsi has the lowest staining ability due to the lack of colorant. Over glazed and auto glazed groups showed better prolonged color stability of porcelain surfaces than the polished group; however, the polishing method can be an effective and more preferable alternative as it has acceptable ∆E values and is free from the limitations of glazing methods.