The Influence of Surface Free-energy on Planimetric Plaque Growth in Man

Abstract

The purpose of this study was to examine the change in plaque area over nine days in vivo on four materials with different sinface freeenergies (s.f e.). Twelve healthy dental students participated in a crossover, split-mouth, double-blind study. Supragingivalplaqueformation was recorded over a nine-day period, on four different materials: fluorethylenepropylene (Teflon) (FEP), parafilm (PAR), cellulose acetate (CA), and enamel (E) with s.f. e. of 20, 26, 57, and 88 erg/cm2, respectively. Strips made from the first three materials were stack to the buccal surface of an upper incisor. The remaining incisor was carefully polished and served as an enamel surface. The increase in plaque was evaluated after three, six, and nine days. A planimetrical analysis was used so that the plaque area could be expressed as a percentage of the total buccal tooth surface. This procedure was repeated on each subject, so that at the end, each pair of central or lateral incisors received the four tested materials.The results indicated that the adherence of micro-organisms on pellicle-coated substrata was influenced by the material's s.f e.; there was an association between the s.fje. of the substrata and the supragingival plaque extension in vivo. High surface free-energy substrata in the oral cavity attracted more micro-organisms than did low energetic materials. Additionally, the bacterial adhesion seemed very weak on surfaces with a low s.f e. J Dent Res 68(5): 796-799, May, 1989 Introduction.

Relevance of surface characteristics in the adhesiveness of polymicrobial biofilms to crown restoration materials

“…Similarly, Quiynen et al demonstrated low bacterial adhesion on Teflon, with a SFE of 20 mN/m, and concluded that the amount of plaque adhesion is affected more by Ra than by SFE (12). In the present study, because the SFE of all samples was approximately 50 mN/m, we presume that SFE can be altered by bacterial adhesion at 20 mN/m.…”

“…Hence, the formation of oral biofilms must be controlled to prevent caries and gum disease in the oral cavity. Adhesion of plaque and pellicle is reportedly affected by surface free energy (SFE) and the surface roughness of the adherend (11,12). Busscher et al reported very low plaque adhesion when the SFE of the tooth surface was less than 50 mN/m (13).…”

Effect of enamel surface modification by novel aqueous phosphate-type fluoride surfactants

“…There was reported increased adhesion to tooth surfaces with a high surface free energy compared to those with a low surface free energy [1][2][3][4] . Further, Busscher et al 5) reported that plaque does not easily adhere to teeth with a surface free energy of 50 mN/m or less.…”

Influence of resin coating materials on Porphyromonas gingivalis attachment

“…We consider that the resin coating materials decrease the surface roughness of the resin plates, especially silica filler in Coat A and aliphatic hexaacrylate in Coat B may be the key materials for the smoothness. Physico-chemical surface components found to be involved in bacterial surface adhesion are the surface charge (zeta potential), wettability (hydrophobicity, hydrophilicity), surface free energy and surface roughness [18][19][20][21][22] . An increased zeta potential, which refers to the electrostatic potential generated by the accumulation of ions on the surface, results in decreased bacterial attachment 19) .…”