Penetration of Different Impression Materials into Exposed Dentinal Tubules during the Impression Procedure

Abstract

Adhesive restorations have been shown to guarantee excellent performance and longevity, although this comes with some disadvantages. Among these, the vulnerability of dentine to different agents has been widely evaluated. The aim of this study was to evaluate the possible penetration of impression materials into freshly cut dentine. Dentine from 27 teeth was impressed with polyether (Impregum Penta L) (nine teeth) and with polyvinyl siloxane (Aquasil Ultra LV) (nine teeth). The surface of nine teeth after the impressions were used as the control. Specifically, the extroflections caused by the imprinting of the dentinal tubules on the impression material, the so-called impression tags, were measured. Furthermore, the presence of the material inside the tubules was examined. Scanning electron microscopy analysis showed material tags for all of the experimental groups. The mean lengths (±SD) were 22.6 (±11.0) µm for polyether, 21.8 (±12.8) µm for polyvinyl siloxane and 11.3 (±7.0) µm for the tooth control, with mean diameters (±SD) of 2.8 (±0.5), 2.4 (±0.7) and 3.1 (±0.7) µm, respectively. Fractal analysis showed fractal dimensions of 1.78 (±0.03), 1.77 (±0.03) and 1.71 (±0.03), respectively. These data demonstrated that the impression materials can remain inside the dentinal tubules, which can adversely affect the adhesive procedures.

Fracture Resistance of Zirconia-Reinforced Lithium Silicate Ceramic Crowns Cemented with Conventional or Adhesive Systems: An In Vitro Study

“…On the other hand, for conventional glass ceramic restorations, the adhesive technique is crucial to have a high quality and lasting bond. With the meaning to establish the most successful clinical protocols and its drawbacks, these techniques have been analysed and studied for years [17,18]. In fact, a variety of cementation techniques have been applied to modern integrated ceramics.…”

Restauración Con Incrustación Semidirecta De Resina en Una Misma Sesión: Concepto Chairside

“…Luego se preparó la pieza de modo expulsivo para recibir la restauración y verificando que los grosores de las cúspides remanentes sean iguales o ma-yores a 2 mm [5][6][7] . Concluida la eliminación de todo el tejido afectado y la realización de la preparación, se procedió a realizar una técnica de sellado dentinario inmediato para rellenar zonas retentivas o de socavado 2,8 , (Figura 1). Con una piedra troncocónica de punta plana y ángulos redondeados (846R -Jota AG) se dio la forma de conveniencia a la preparación.…”

Water-Airborne-Particle Abrasion as a Pre-Treatment to Improve Bioadhesion and Bond Strength of Glass–Ceramic Restorations: From In Vitro Study to 15-Year Survival Rate

“…Delayed dentin sealing is traditionally performed for indirect restorations, so the dentin is sealed after the provisional phase during the cementation appointment. Unfortunately, this technique cannot provide optimal conditions for bonding procedures [2,3] due to tooth surface contamination by provisional cement, bacteria and even impression material [4]. To overcome these inconveniences and to improve the bonding performance, immediate dentin sealing (IDS) was introduced for adhesive restorations [4][5][6][7][8][9][10].…”