Читать книгу Periodontics - Fernando Suarez - Страница 111

The proper contour and adaptation of the restorative margins may also influence the presence of other factors such as overhangs, open contacts, food retention/impaction, recurrent caries, and plaque retention—and thus play a role in periodontal breakdown.^213,214 In this sense, Chan and Weber assessed crown margins and classified them into three groups based on the transition of the probe against the margin.¹⁹⁸ The classification proposed included grade I, grade II, and grade III for margins with a smooth transition from restoration to tooth substance, margins with a slight irregularity, and gross imperfections of the crown margin, respectively.