The effects of crown venting or pre‐cementing of CAD/CAM‐constructed all‐ceramic crowns luted on YTZ implants on marginal cement excess

Abstract

Using crown venting was the most effective measure to reduce the amount of marginal excess cement, followed using a pre-cementation device. To keep the marginal excess cement of one-piece zirconia implants to a minimum, both techniques should be considered for clinical application.

Fracture behavior, marginal gap width, and marginal quality of vented or pre‐cemented CAD/CAM all‐ceramic crowns luted on Y‐TZP implants

“…It is important to note that this venting before the final stage of crown processing did not diminish fracture strength of the all‐ceramic crowns, and small amounts of marginal excess cements were demonstrated (Zaugg et al., ). A standardized procedure was applied, in which crowns were half‐filled and the cement was distributed with a microbrush to the inner faces, and the small variance in the cement volume retained in the crown indicated similar cement spaces for both ceramic materials (Zaugg et al., ). Surface treatment of the crowns was performed according to the manufacturers’ instruction with glaze firing (LS 2 ) and polishing (ZrO 2 ) that may have resulted in different surface roughness.…”

“…Briefly, twelve experimental groups ( n = 6 per group) were set up according to the i) material of restoration: lithium disilicate “L” or zirconium dioxide “Z,” ii) type of cement: dual‐cure adhesive composite cement “A” or resin‐modified glass ionomer cement “B,” and iii) cementation technique: palatal venting “PV”, custom analog “CA”, or standard procedure “SP” (Zaugg et al., ). The sample size with n = 6 per group was based on a power calculation comparing three groups (CA, PV, and SP) with a power of 80% and a significance level of 5% applying the function “power.anova.test” (Zaugg et al., ). In addition, four control groups ( n = 2 per group) without cementation (NC, no cement) were included and represented both restoration materials with and without palatal venting.…”

“…A recent in vitro study compared crown venting, pre‐cementation with a custom analog, and the conventional standard procedure and demonstrated that crown venting was the most effective measure to reduce the amount of marginal excess cement (Zaugg, Zehnder, Rohr, Fischer & Zitzmann, ). Compared to the standard cementation, cement excess was reduced by 32% when using the custom analog and by 59% when the all‐ceramic crowns were provided with a palatal vent hole (Zaugg et al., ).…”

“…Another option to control marginal cement excess is crown venting, which is an established technique to improve the seating of cast gold crowns (Bassett, 1966;Cooper, Christensen, Laswell & Baxter, 1971;Cruz, Sorenson & Johnson, 2008), porcelainfused-to-metal (PFM) restorations (McAllister, 2008), and all-ceramic crowns (Clark, Richards & Meiers, 1995;Sallustio, Waskewicz & Billy, 1992) and was also applied for implant-supported PFM restorations (Schwedhelm, Lepe & Aw, 2003). A recent in vitro study compared crown venting, pre-cementation with a custom analog, and the conventional standard procedure and demonstrated that crown venting was the most effective measure to reduce the amount of marginal excess cement (Zaugg, Zehnder, Rohr, Fischer & Zitzmann, 2017). Compared to the standard cementation, cement excess was reduced by 32% when using the custom analog and by 59% when the all-ceramic crowns were provided with a palatal vent hole (Zaugg et al, 2017).…”

Einteilige keramische Implantate – digital geplant und hülsenlos geführt inseriert

“…Beim Zementieren des Zahnersatzes auf einteiligen Implantaten besteht die Gefahr von unerreichbaren Zementresten, einhergehend mit periimplantären Entzündungen des Weichgewebes [7]. Diese können bei der Eingliederung des Zahnersatzes auch ohne Gingivaretraktion mithilfe eines oral gelegenen Abflusslochs oder einem Vorzementieren im Labor deutlich reduziert werden [8]. ▶ Abb.…”