The effect of dentine surface treatment on pulpward pressure transmission during crown cementation: a laboratory study

Abstract

Thirty extracted human premolars received standardised full crown preparations. The teeth were randomly assigned into three groups: smeared (control), etched (phosphoric acid gel), and bonded (Scotchbond MP). Each tooth was perfused with saline to establish perfusion rates at baseline for all groups, and the post-etching stage for etched and bonded groups, post-bonding stage for bonded group, and post-cementation stage for all groups. Crowns made with four layers of die-spacing were cemented with zinc phosphate cement at 100N. Pulpal pressures were measured with a pressure transducer. It was concluded that dentine bonding agents may have the potential to reduce pulpal damage caused by pressure transmission from cementation.

The effect of oscillation, low seating force and dentine surface treatment on pulpward pressure transmission during crown cementation: a laboratory study

“…We designed our experiments in such way that they would allow crowns to be cemented with relatively low pulpward pressures and at the same time maintain good crown seating. The effect of sealing dentinal tubules on pulpward pressure transmission was demonstrated in the work of several authors (Wylie & Wilson, 1994; Lam & Wilson, 1998). By sealing the dentinal tubules we were able to negate the increase in the pulpward pressure produced by oscillation.…”

“…To make our study consistent with previous studies in this series (Wylie & Wilson, 1994; Wong & Wilson, 1997; Lam & Wilson, 1998; Yuen & Wilson, 2000; Humplik & Wilson, 2001), group one served as a control 100 N; cementation forces combined with etched dentinal surface were used in order to produce high pressure in the pulp chamber as well as good post‐cementation crown seating. The results achieved for this group, both in pressure generated and transmitted to the pulp chamber and post‐cementation crown discrepancy, were consistent with those previously shown (Wylie & Wilson, 1994; Wong & Wilson, 1997; Lam & Wilson, 1998; Yuen & Wilson, 2000; Humplik & Wilson, 2001).…”

“…A group of teeth (1–10) served as a control. Crowns in this group were cemented under static force of 100 N, as previously used (Wylie & Wilson, 1994; Wong & Wilson, 1997; Lam & Wilson, 1998; Yuen & Wilson, 2000; Humplik & Wilson, 2001).…”

“…Subsequent related investigations (Lam & Wilson, 1998; Yuen & Wilson, 2000; Humplik & Wilson, 2001) have concentrated on clinically feasible ways of allowing good seating of crowns whilst reducing pressure generated and transmitted to the pulp chamber during cementation of crowns.…”

“…Lam and Wilson (1998) showed that sealing of the dentine surface with a dentine bonding agent significantly reduced pressure transmitted to the pulp chamber and had no effect on post‐cementation crown seating.…”