Available online 17 November 2023

The purpose of this systematic review was to identify which metal surface treatments best increase the bond strength between heat polymerized acrylic resin and removable partial denture alloys.

This review was carried out following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and registered in the International Prospective Registry of Systematic Reviews (PROSPERO) database (CRD42022384926). Electronic searches were carried out independently, by 3 examiners in Medline/PubMed, Scopus, and Web of Science databases, and in the nonpeer-reviewed literature via ProQuest.

The electronic searches resulted in 4143 articles, with 4055 after removing duplicates. After reading the titles and abstracts, 37 articles were selected for reading in full-text version, from which 6 articles were included. All studies evaluated materials for conventional acrylic resin denture base (heat polymerized), processed by water bath, bonded to metal. For the metal framework alloys, cobalt chromium (Co-Cr) alloys were used in 2 studies, titanium (Ti) in 2 studies, and Co-Cr and Ti in the other 2 studies. Different metal surface treatments were used as airborne-particle abrasion with aluminum oxide (particle sizes of 50 µm, 110 µm, and 250 µm) followed by the primer application and the isolated use of the primer, compared to the absence of isolated intervention or airborne-particle abrasion of the metal surface. Among the different primers used, those based on 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) showed the highest acrylic resin-to-metal bond strength values.

Airborne-particle abrading the metal with Al2O3 followed by applying a 10-MDP-based primer, increased the bond strength between metal framework alloys and heat polymerized acrylic resin denture base material.

This systematic review followed the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement.18 In addition, the review protocol was registered with the International Prospective Registry of Systematic Reviews (PROSPERO), receiving protocol number (CRD42022384926) (https://www.crd.york.ac.uk/prospero/record_email.php).

The selected studies were designed according to the population, intervention, comparison, outcome (PICO) strategy. The

The electronic search resulted in a total of 4143 articles, reduced to 4055 articles after removing duplicates. After screening the titles and abstracts, 37 articles remained for further evaluation, and finally, 6 articles were included in the review after reading in full. All studies were published between 1998 and 2019 (Fig. 1). The kappa coefficient was 0.92 for PubMed/MEDLINE, 0.75 for Scopus, 0.84 for Web of Science, and 0.73 for ProQuest. Therefore, a high level of agreement between

The hypothesis of this study that the metal surface treatment would increase the bond strength between a metal framework and the acrylic resin denture base was accepted, as the surface treatment of the metal framework alloys influenced the bond strength between metal alloys and acrylic resin denture base. The application of airborne-particle abrasion with aluminum oxide on the metal surface combined with a metal primer based on 10-MDP monomer increased the bond strength between the acrylic

Based on the findings of this systematic review, the following conclusion was drawn:

The use of airborne-particle abrasion with aluminum oxide particles associated with the use of primers based on 10-MDP monomer increased the bond strength between heat polymerized acrylic resin denture base materials and metal RPD framework alloys.

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