J Adv Prosthodont.  2018 Apr;10(2):122-127. 10.4047/jap.2018.10.2.122.

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

• Lima AP
• Vitti RP
• Amaral M
• Neves AC
• da Silva Concilio LR

• KMID: 2409631
• DOI: http://doi.org/10.4047/jap.2018.10.2.122

Abstract

PURPOSE
This 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 METHODS
Forty 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).
RESULTS
he 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).
CONCLUSION
The conventional acrylic resin polymerized using two curing cycles in a water bath led to less difference in OVD of complete-arch prosthesis.

Keyword

Denture; Complete; Dental occlusion; Acrylic resins; Polymerization

MeSH Terms

Acrylic Resins
Baths
Dental Occlusion
Dentures
Methods*
Microwaves
Polymerization*
Polymers*
Prostheses and Implants*
Vertical Dimension*
Water
Acrylic Resins
Polymers
Water

Figure

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  Fig. 1 Procedures of the polymerization process used in each group.

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  Fig. 2 Method used for measurement of alterations in occlusal vertical dimension: a digital caliper was used to measure the distance between the upper and lower frame of SAA before and after polymerization.

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  Fig. 3 Standardization of the contact points.

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  Fig. 4 Image already inserted into the software with occlusal contacts marked to have the area measured.

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