00000ctm a22000003a 4500 UP-1685523046126166567 Buklod 20090112145046.0 a r |||| u| ta 090112s xx d r |||| u| (iLib)UPMNL-00006856179 UPDent eng LG 993.5 2008 D4 B35 Balboa, Abegail P. An in-vitro study on the effectiveness of a guava gel as a tooth whitening agent Abegail P. Balboa, Anna Michelle M. Yusi. 83 leaves Seminar Paper--Doctor of Dental Medicine--University of the Philippines Manila. The demand for teeth whitening has greatly increased as influenced by media, as well as the advancements in dental materials, making teeth whitening agents readily available to consumers. Most of these products come in gel form which contacts tooth surface longer making it more effective. However, these products are expensive. To address this, organic alternatives of whitening teeth have been investigated. This study aimed to determine the effect of a guava gel on the shade of bovine teeth. The experiment lasted for 22 days and utilized a random sampling scheme. Four groups were employed with nine specimens each. Two groups were exposed to the guava gel for 30 minutes (Gl) and 1 hour (G2) and two other groups served as controls (CI and C2). The specimens were immersed in artificial saliva and stored in an incubator with a temperature of 36°C to simulate oral conditions. Shade of each specimen was recorded at baseline, on day 15 and on day 22 of the study using a reflectance spectrophotometer. After 15 days, the experimental groups demonstrated a change to a darker or blacker shade while the control groups changed to a lighter shade. Opposite results were obtained on day 22. Statistical analysis of data using One-way ANOVA showed that the p values for the change in shade after day 15 {p = 0.346) and day 22 (p = 0.436) are greater than the level of significance (a = 0.05). Therefore, the guava gel has no clinically and statistically significant whitening effect on bovine teeth after exposure to the formulation at different contact times. Teeth Bleaching. Dentistry Aesthetic aspects. Yusi, Anna Michelle M. Yumul, Giselle S. (Adviser). UPMNL DENT LG 993.5 2008 D4 B35 Thesis