Índice de infiltração marginal em duas técnicas de cimentação de pinos de fibra de vidro com cimento resinoso autocondicionante.

Abstract

In modern restorative procedures, fiberglass posts are widely used in dentistry to strengthen dental structure, dissipate masticatory loads and improve the retention of restorative materials in endodontically treated teeth. This study seeks to compare, through laboratory tests and bibliographic reviews, which of the fiberglass posts cementation techniques withstand with a lower rate of marginal leakage. 20 bovine teeth were sectioned in the region of the cementoenamel junction, prepared, lutted with zinc oxide cement (Endofil, Dentsply Sirona®, Pirassununga, SP, Brazil) and divided into two groups. Group I: fiberglass post (Whitepost DC 3, FGM®, Santa Catarina, Brazil) cemented exclusively with SET-PP self-adhesive resin cement (SDI®, Bayswater, Australia); Group II: fiberglass post relined with Charisma composite resin (Kulzer GmbH®, Hanau, Germany) and cementation with self-adhesive resin cement. After cemented, both groups were stored in 1% gentian violet solution (UNIPHAR, Anápolis, GO, Brazil). After 7 days, the teeth were sectioned along the axis and the fiberglass posts slices were removed and with the aid of a digital Caliper (Starrett®, Brazil) the depths of dye infiltration in each slice were measured. The results were submitted to the Mann-Whitney t-test (p<0.05). The cementation technique with self adhesive resin cement in fiberglass posts relined with composite resin (Group II) showed a higher infiltration rate (p<0,007), with an arithmetic average of 0.95mm higher when compared to the exclusive cementation group with fiberglass post (Group I). Average (Group I: 2.69, Group II: 3.42), median (Group I: 2.50, Group II: 3.42), standard deviation (Group I: 1.20, Group II: 1.07). The treatment with relined fiberglass posts with composite resin showed higher rates of marginal leakage.