Effect of polymerization method and fabrication method on occlusal vertical dimension and occlusal contacts of complete-arch prosthesis

Abstract

PURPOSEThis study evaluated the dimensional stability of a complete-arch prosthesis processed by conventional method in water bath or microwave energy and polymerized by two different curing cycles.MATERIALS AND METHODSForty maxillary complete-arch prostheses were randomly divided into four groups (n = 10): MW1 - acrylic resin cured by one microwave cycle; MW2 - acrylic resin cured by two microwave cycles: WB1 - conventional acrylic resin polymerized using one curing cycle in a water bath; WB2 - conventional acrylic resin polymerized using two curing cycles in a water bath. For evaluation of dimensional stability, occlusal vertical dimension (OVD) and area of contact points were measured in two different measurement times: before and after the polymerization method. A digital caliper was used for OVD measurement. Occlusal contact registration strips were used between maxillary and mandibular dentures to measure the contact points. The images were measured using the software IpWin32, and the differences before and after the polymerization methods were calculated. The data were statistically analyzed using the one-way ANOVA and Tukey test (α = .05).RESULTShe results demonstrated significant statistical differences for OVD between different measurement times for all groups. MW1 presented the highest OVD values, while WB2 had the lowest OVD values (P<.05). No statistical differences were found for area of contact points among the groups (P=.7150).CONCLUSIONThe conventional acrylic resin polymerized using two curing cycles in a water bath led to less difference in OVD of complete-arch prosthesis.

Effect of flask closure method on occlusal vertical dimension of complete upper and lower dentures

“…[17][18][19] Several studies which obtained measurements in a comparable manner reported difference measures between preprocessing and post-processing measurements instead of the actual measurements. [20][21][22] There was insufficient evidence (p (0.568) >0.05) to reject the null hypothesis that the covariate (pretest) was not different across the levels of the independent variable (treatment group) in the analysis. The interaction effect between the covariate (pretest) and independent variable (group) in a model that includes the interaction between the covariate and independent variable was not significant (p (0.927) >0.05).…”

Polymerization Cycle and Occlusal Vertical Dimension of Complete Dentures: Systematic Review and Meta-Analysis

“…Despite its wide use, acrylic resin has some limitations related to its physical properties, which can change according to processing techniques. In the case of complete dentures, this may lead to changes in the occlusal vertical dimension (OVD), with consequent changes in tooth positions [4][5][6] .…”

“…Dimensional changes in occlusion and OVDs may occur after inclusion and polymerization of complete dentures and are influenced by several factors, such as different prosthesis processing methods, the shape and type of material used for inclusion, prosthesis pressing, and the polymerization cycle [4][5][6][7]17,18 . The method of evaluation in both the clinic and the laboratory uses linear horizontal and vertical measurements in dentures 6,7,[9][10][11] .…”

Synthesis and Characterization of a Ring-Opening Oxaspiro Comonomer by a Novel Catalytic Method for Denture Base Resins

“…The polymerization method and processing technique were modified in an attempt to reduce the dimensional errors. [ 21 22 ] Furthermore, concerning the material, various additives such as synthetic fibers, metallic wires, inorganic fillers, and rubber toughening agents have been incorporated in the acrylic resin to reduce the shrinkage. [ 23 24 25 ] However, monomeric modifications are not uncommon.…”