Advanced in vitro exposure systems.

Comparative Effect of a Candidate Modified Risk Tobacco Product Aerosol and Cigarette Smoke on Color Stability of Enamel, Dentin and Dental Composite Resins

1. Feb. 2018

SRNT 2018

Filippo Zanetti1, Xiaoyi Zhao2,3, Shoaib Majeed1, Hans Malmstrom2, Manuel C. Peitsch1, Yanfang Ren2, Julia Hoeng1

1 PMI R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
2
University of Rochester Eastman Institute for Oral Health
, Rochester, New York
3
Peking University School of Stomatology
, Peking, China

In this study, the effects of 3R4F cigarette smoke and THS2.2 aerosol on color stability and surface roughness of premolar human teeth were investigated.

The poster was presented at SRNT 2018, https://www.srnt.org/

Introduction
Cigarette smoke (CS) has been recognized as one of the factors causing stain and discoloration of teeth and restorative composite resin [1]. CS increases water sorption and solubility of composite resins [2], which may lead to deposition of metal ions into the resin matrix [3] and increase their discoloration [4]. Smoking could also decrease the luminosity and increase the resin surface roughness [5] and affect the bonding strength of dental composite resins to dentin, which may compromise the long-term outcomes of the restorations [6]. CS affects also the surface properties, like microhardness, of dental hard tissues and restorations and causes discoloration of teeth [7]. The severity of smoke-related dental discoloration is largely dependent on the quantity of tar generated during the combustion of tobacco at very high temperatures. Modified risk tobacco products (MRTP) are a promising alternative to continued smoking for people unwilling to quit. Some of these products, such as the Tobacco Heating System (THS) 2.2, a candidate MRTP, heats tobacco instead of burning it and does not produce "tar" as that term is commonly defined and understood (i.e., the particulate residue from CS when a cigarette is burned). Accordingly, THS2.2 carries the potential to minimize the risk of tooth and dental composite discoloration [8].

Objectives
In this study, we investigated, for the first time, the effects of the aerosol generated by THS2.2 on color stability and surface roughness of premolar human teeth and composite resins, compared with that generated by CS.

This poster was presented at SRNT 2018, https://www.srnt.org/

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