de Jong, R. (2022) Evaluation of the light transmission through polyetherketoneketone (PEKK) and the resulting degree of conversion of an underlying composite resin. thesis, Dentistry.
Full text available on request.Abstract
Objectives: A new group of thermoplastic polymers also known as polyaryletherketones have been introduced in dentistry. Two polyaryletherketones are being used in dentistry: polyetheretherketone and polyetherketoneketone (PEKK). PEKK presents good fracture strength, a compressive strength and better long-term resistance to fatigue. Due to these advantageous features PEKK might be indicated for single indirect restorations. When it comes to the eligibility of a material for indirect restorations it is important to investigate the light transmission and the degree of conversion (DC) through it. The aim of the study is to evaluate the possible applicability of PEKK as a single indirect restoration (e.g., crowns, inlays, overlays and endocrowns) by comparing them to four more conventional materials: high translucency lithium disilicate (LDShigh), low translucency lithium disilicate (LDSlow), zirconia and particlefilled composite in terms of the amount of light transmission and the degree of conversion of an underlying composite resin. Research question: What will be the amount of light transmission through different materials: polyetherketoneketone (PEKK), lithium disilicate high and low translucency, zirconia and particle-filled composite and the corresponding degree of conversion of the underlying composite resin layer? Materials and methods: An in vitro, randomized controlled laboratorial study has been set up to measure the light transmission and the degree of conversion (DC) through the different material samples. The samples of all five groups (n=30) are milled, pressed or sliced into 12 mm diameter x 2 mm depth cylinder-shaped samples. Light transmission has been measured by using a radiometer and the DC by a Fourier Transformed InfraRed (TR-IR) spectrophotometer. Statistical analysis will be performed using a two-way ANOVA with a simple effects analysis to figure out which groups are different from each other. Results: The two-way ANOVA shows that the 2.0 mm and 4.0 mm PEKK samples leads to significantly insufficient light transmission and degree of conversion when compared to the other four groups (LDShigh, LDSlow, zirconia and particle-filled composite). The 6.0 mm PEKK samples show that no difference is found between PEKK and LDSlow, however, both material types are significant worse compared to the other three samples. Conclusion: Significant difference are observed between PEKK and the other groups for both variables. The results of this study show that PEKK is not indicated for single monolithic indirect restorations with an underlying luting resin.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Sugii, dr. M. Miura and Gresnigt, dr. M.M. |
| Faculty: | Medical Sciences |
| Date Deposited: | 09 May 2023 11:46 |
| Last Modified: | 09 May 2023 11:46 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3519 |
Actions (login required)
 |
View Item |