Examinando por Materia "Resin insertion techniques"

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    Evaluation of the compressive strength of a composite resin inserted directly incrementally versus block insertion and with pre-photopolymerized resin: in vitro study, 2021
    (Universidad Privada Norbert Wiener, 2024-06-06) Sobrevilla Alarcón, Anai Yesenia; Arauzo Sinchez, Carlos Javier
    One of the major disadvantages of composite resins is their post-photopolymerization shrinkage effect when incremented by more than 2mm in thickness. Due to this, alternative options such as Bulk Fill resins, which allow for an increase of up to 5mm in thickness, and the use of previously photopolymerized resins, are available in the market. Objective: To determine which composite resin insertion technique in proximal cavities has greater compressive strength. Methodology: 45 resin samples were made using acrylic tooth cavities measuring 4x10mm, which were replicated through condensation silicone impressions. The resin samples were from the 3M ESPE brand and divided into three groups: G1: n=15 (Filtek Z350 XT Resin); G2: n=15 (Filtek Bulk Fill Resin); G3: n=15 (Filtek Z350 Resin with Z350 XT Flowable Resin). The resin insertion techniques for G1 used an incremental technique of 2mm thickness; G2 used a block technique with a single 5mm increment; and G3 used a mixed technique with flowable resin and pre-photopolymerized resins. The samples were calibrated and measured using a caliper and periodontal probe. Once the samples were obtained, they were subjected to a compressive strength test using a mechanical testing machine and a Digital Vernier (LG-CMT-5L Mitutoyo-200mm). Results: The compressive strength was 994.88 Newtons using the block technique, 1458.19 Newtons with the incremental technique, and 1241.30 Newtons with the pre-photopolymerized resin technique. There was a significant difference showing higher resistance using the incremental technique compared to the block technique (p<0.05). Conclusion: The incremental resin insertion technique has greater resistance to fracture compared to the block and pre-photopolymerized resin techniques.