Skip to Main Content
 

Global Search Box

 
 
 
 

Files

ETD Abstract Container

Abstract Header

A Comparison of Zirconia and Titanium Abutments for Microleakage

ABDELHAMED, MOHAMED IBRAHIM

Abstract Details

2010, Master of Science, Ohio State University, Dentistry.

Background: The existence of a microgap in two-piece implant system has been well documented in the literature. This microgap is in microns size and several in-vitro studies tested the microleakage through the microgap and its effect on hard and soft tissues. It was proven that this gap acts as a reservoir for bacteria which induced peri-implant tissue inflammatory reactions. Microleakage through the interface differ between implant body-abutment connections systems and study methodology. There is an increased demand for all ceramic crowns and zirconia abutments in the anterior sextant due to esthetic reasons. To our knowledge there is not enough information regarding leakage around zirconia abutments. Thus it was the purpose of the study to compare titanium abutments and zirconia abutments for microleakage under two different torque values.

Materials and Methods: Thirty two dental implants, sixteen titanium abutments and sixteen zirconia abutments were used in this study. Four study groups: [Group A (titanium abutment torqued at 25Ncm), Group B (titanium abutment torqued at 15Ncm), Group C (zirconia abutment torqued at 25Ncm) and Group D (zirconia abutment torqued at 15Ncm)] were included. Micro-CT technology was chosen to scan the assemblies for the detection of a microgap. Microleakage from the implant chamber to the external milieu was evaluated using LAL test while microleakage from the external milieu to the implant chamber was evaluated using toluidine blue dye and colorimeter to detect color change. Statistical Analysis: Data was analyzed using Two-way Analysis of Variance (ANOVA) with Benferroni post test. The level of statistical significance was set at alpha=0.05. Results: Micro-CT images could not detect microgap at a resolution of 9.7 micron. LAL test showed that there is a time dependent increase in microleakage independent from abutment time or closing torque and a statistically significant difference was detected within zirconia abutment with closing torque value of 15Ncm (P<0.05). The toluidine blue test showed that there is no statistically significant time effect on microleakage independent from abutment type/torque value although leakage increased in general with time. Repeated torque/anti-torque does not have a statistically significant effect on microleakage although more leakage was noted with titanium abutment torqued/antitorqued several times. Also there was no statistical significant difference in microleakage through the screw access hole in the four different groups.

Conclusion: With in the limit of this in-vitro study, it can be concluded that there is no statistically significant difference in bidirectional microleakage between titanium and zirconia abutments at different closing torque values in non-loading condition. However there is a significant increase in microleakage in general with time even in non-loaded condition. In addition there is a time-dependent rate difference in leakage from internal chamber to the external milieu compared to from external milieu to internal chamber between two different abutments at various torque values. Future studies needed to determine the effect of this bidirectional microleakage on peri-implant tissues around zirconia abutments. Also this in-vitro study can be repeated under loading condition to determine differential effect of loading on bidirectional microleakage around zirconia abutments.

Binnaz Leblebicioglu (Advisor)
Julie Holloway (Committee Member)
Edwin McGlumphy (Committee Member)

Recommended Citations

Citations

  • ABDELHAMED, M. I. (2010). A Comparison of Zirconia and Titanium Abutments for Microleakage [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275054502

    APA Style (7th edition)

  • ABDELHAMED, MOHAMED. A Comparison of Zirconia and Titanium Abutments for Microleakage. 2010. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1275054502.

    MLA Style (8th edition)

  • ABDELHAMED, MOHAMED. "A Comparison of Zirconia and Titanium Abutments for Microleakage." Master's thesis, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275054502

    Chicago Manual of Style (17th edition)