Pascal Magne1, Brik Nielsen. 1. University of Southern California School of Dentistry, Oral Health Center, Los Angeles, CA 90089, USA. magne@usc.edu
Abstract
STATEMENT OF PROBLEM: Immediate dentin sealing is a new strategy in which a dentin bonding agent is applied to freshly cut dentin and polymerized before making an impression. Interactions are suspected between the resin coating and the impression material. PURPOSE: The purpose of this study was to identify possible interactions between 2 impression materials and resin-coated tooth surfaces using 2 different dentin bonding agents. MATERIAL AND METHODS: Extracted molars (n=6) with flat midcoronal preparations underwent 1 of 4 procedures: control group, unsealed tooth surface/impression; IDS group, immediate dentin sealing (Optibond FL or Clearfil SE Bond)/impression; IDS/AB group, immediate dentin sealing/air blocking/impression; IDS/AB-P group, immediate dentin sealing/air blocking/pumicing/impression. All specimens underwent impressions (Impregum Soft or Extrude). Optical microscopy was used to detect unpolymerized and residual impression material on the bonded tooth surface. RESULTS: A substantial layer of unpolymerized resin (oxygen-inhibited layer) was found in the IDS group, which resulted in100% faulty impressions (unpolymerized impression material) for both adhesives and impression materials. Air blocking the resin coating (IDS/AB group) did not completely eliminate the oxygen-inhibited layer of Optibond FL and slightly altered the surface of SE Bond (wrinkles). Only SE Bond along with Extrude generated ideal impressions in group IDS/AB, while all other combinations of adhesive/impression material resulted in faulty impressions (unpolymerized impression material or adhesions). The IDS/AB-P group yielded ideal Extrude impressions but generated faulty Impregum impressions (adhesions) in more than 50% of the specimens. CONCLUSIONS: Immediate dentin sealing should be followed by air blocking and pumicing to generate ideal impressions with Extrude. Impregum is not recommended in combination with immediate dentin sealing.
STATEMENT OF PROBLEM: Immediate dentin sealing is a new strategy in which a dentin bonding agent is applied to freshly cut dentin and polymerized before making an impression. Interactions are suspected between the resin coating and the impression material. PURPOSE: The purpose of this study was to identify possible interactions between 2 impression materials and resin-coated tooth surfaces using 2 different dentin bonding agents. MATERIAL AND METHODS: Extracted molars (n=6) with flat midcoronal preparations underwent 1 of 4 procedures: control group, unsealed tooth surface/impression; IDS group, immediate dentin sealing (Optibond FL or Clearfil SE Bond)/impression; IDS/AB group, immediate dentin sealing/air blocking/impression; IDS/AB-P group, immediate dentin sealing/air blocking/pumicing/impression. All specimens underwent impressions (Impregum Soft or Extrude). Optical microscopy was used to detect unpolymerized and residual impression material on the bonded tooth surface. RESULTS: A substantial layer of unpolymerized resin (oxygen-inhibited layer) was found in the IDS group, which resulted in100% faulty impressions (unpolymerized impression material) for both adhesives and impression materials. Air blocking the resin coating (IDS/AB group) did not completely eliminate the oxygen-inhibited layer of Optibond FL and slightly altered the surface of SE Bond (wrinkles). Only SE Bond along with Extrude generated ideal impressions in group IDS/AB, while all other combinations of adhesive/impression material resulted in faulty impressions (unpolymerized impression material or adhesions). The IDS/AB-P group yielded ideal Extrude impressions but generated faulty Impregum impressions (adhesions) in more than 50% of the specimens. CONCLUSIONS: Immediate dentin sealing should be followed by air blocking and pumicing to generate ideal impressions with Extrude. Impregum is not recommended in combination with immediate dentin sealing.
Authors: Manar M Abu Nawareg; Ahmed Z Zidan; Jianfeng Zhou; Ayaka Chiba; Jungi Tagami; David H Pashley Journal: Am J Dent Date: 2015-12 Impact factor: 1.522
Authors: Mohammad A Al-Rabab'ah; Muhanad M Hatamleh; Sandra Al-Tarawneh; Ahmad El-Ma'aita; Ibrahim Abu Tahun; Issam S Jalham Journal: J Indian Prosthodont Soc Date: 2021 Apr-Jun