The Effect of McInnes Solution on Enamel and the Effect of GC Tooth Mousse on Bleached Enamel: An In Vitro Study Janavathi1,*, Rajnikanth2, Jyothi L3,**, Kumar Naveen4,***, Rao T Tirumal5,**** 1Senior Lecturer, Department of Conservative Dentistry and Endodontics, Sree Sai Dental College and Research Institute, Chapuram, Srikakulam-532001, Andhra Pradesh, India 2Principal, Department of Periodontics, Sree Sai Dental College and Research Institute, Chapuram, Srikakulam-532001, Andhra Pradesh, India 3Reader, Department of Periodontics, Navodaya Dental College and Hospital, Raichur, Karnataka, India 4Reader, Department of Oral and Maxillofacial Pathology, Sree Sai Dental College and Research Institute, Chapuram, Srikakulam, Andhra Pradesh, India 5Assistant Professor, Department of Dentistry, Raichur Institute of Medical Sciences, Raichur-584103, Karnataka, India Corresponding Author Email: *jandr@rediffmail.com
**dr.jyothi_rao@rediffmail.com
***naveen_motupalli@yahoo.com
****tirumalrao.2007@rediffmail.com
Online published on 15 May, 2014. Abstract The aim is to evaluate the effect of McInnes bleaching agent on the microhardness of enamel before and after bleaching and to evaluate the effect of G C Tooth Mousse on the bleached enamel surface for its microhardness. The materials and methods used are McInnes bleaching solution, Casein phosphopeptide-amorphous calcium phosphate CCP-ACP (G C Tooth mousse) artificial saliva (Dept. of Oral Pathology, GDC Bellary), deionized water, Vickers’ Micro Hardness tester (Zwick/ZHV, Germany), freshly extracted teeth, cold cure acrylic, Diamond disc (Horico–PFINGST New Jersey, USA, KAVO-Germany), straight handpiece (kavopecareta) and plastic moulds (6.5 × 2 mm2). The purpose of this study was to evaluate and compare microhardness of the sound enamel surface by Vickers’ Hardness Number (VHN) before and after bleaching with McInnes solution, and to evaluate the effect of casein phosphopeptide amorphous calcium phosphate (G C Tooth Mousse) on the bleached enamel surface for its microhardness. The data obtained from the test were subjected for statistical analysis and are presented as range, mean and standard deviation. P value of 0.05 or less was considered for statistical significance. The changes in microhardness at different times of assessment were analyzed using the paired ‘t’ test. The results of all the samples showed decrease in the microhardness after two cycles of bleaching, though immediately after bleaching the decrease in the microhardness was not significant (P = 0.34). However, after the second cycles, it showed a significant decrease (P<0.01) in the microhardness. After application of remineralization solution (GC Tooth mousse), the samples showed a marginal increase in the microhardness (P<0.05) after seven days and a marked increase after fourteen days (P<0.001).McInnes bleaching agent does decrease the microhardness of enamel by causing enamel demineralization and GC Tooth mousse used in the study causes an increase in the microhardness of bleached enamel by maintaining a high gradient of calcium and phosphate ions at the enamel subsurface. Top Keywords Amorphous calcium phosphate, Bleaching, Casein phosphopeptide, Enamel, Hardness, Remineralization, Vickers’ hardness number. Top |