Journal of Iranian Dental Association
J Iran Dent Assoc
Medical Sciences
http://jida.ir
23
journal23
2383-3041
10.52547/jida
en
jalali
1393
4
1
gregorian
2014
7
1
26
3
online
1
fulltext
en
تأثیر ضخامتهای مختلف کور زیرکونیا بر تطابق لبهای رستوریشنهای تمام سرامیک
Effect of Thickness of Zirconia Core on Marginal Adaptation of All-Ceramic Restorations
Prosthodontics
Prosthodontics
Original
Original
<p> <strong> Background and Aim </strong><strong>: </strong>Marginal adaptation is important for long-term Successof full-coverage restorations. Thickness of core is one of the important factors influencing the marginal integrity.Thus, the aim of this studywas to evaluate the effect of different thicknesses of zirconia core on marginal adaptation of all-ceramic restorations .</p>
<p> <strong> Materials and Methods </strong><strong>: </strong>In this single blind in vitro study,a standard brass die7 mm in length and 5 mm in diameter was prepared with a classic chamfer finish line with 0.8 mm depthand 10 degrees of wall taper. Copings were made using the CAD / CAM system. We had three groupsof10 samples each.Group 1 with a zirconia thickness of 3.0 mm, group 2 with a thickness of 0.5 mm and group 3 with a thickness of 0.7 mm. Copings were then placed on the die and randomly numbered. The vertical gap in the margin was measured at 10 points using scanning electron microscopy (SEM). Data were collected. The mean and standard deviation values were calculated and ANOVA. was used for the comparison of the three groups. Tukey’s test was also applied<strong> . </strong></p>
<p> <strong> Results </strong><strong>: </strong>The gap in 0.3,0.5 and 0.7 mm thicknesses of zirconia before porcelain firing was 89.21± 28.90, 79.55 ± 39.32 and 40.813 ± 10.3 µ, respectively.The difference in marginal gap between the three groups was statistically significant (p=0.001).Tukey’s test failed to find a significant difference in marginal gap between 0.3 and 0.5 mm thicknesses (p=0.006). But, the difference between 0.3 and 0.7 mm (p=0.001) and also 0.5 and 0.7mm (p=0.001) was statistically significant .</p>
<p> <strong> Conclusion </strong><strong>: </strong>Based on the results, by increasing the thickness of the zirconia core marginal gap decreases in all ceramic restorations .</p>
<p></p>
Marginal gap , Zirconia , CAD / CAM , Marginal adaptation
158
162
http://jida.ir/browse.php?a_code=A-10-1-769&slc_lang=en&sid=1
Ezatollah
Jalalian
2300319475328460019685
2300319475328460019685
No
Associate Professor, Department of Prosthodontics, School of Dentistry, Dental Branch Islamic Azad University. Tehran, Iran
Mona
Sadegh
moona851@yahoo.com
2300319475328460019686
2300319475328460019686
Yes
Assistant Professor, Department of Endodontics, School of Dentistry, Dental Branch Tehran University International Campus. Tehran, Iran
Sedighe
Masoomi
2300319475328460019687
2300319475328460019687
No
Dentist
Shahriar
Jalalian
2300319475328460019688
2300319475328460019688
No
Assistant Professor, Department of Operative Dentistry, School of Dentistry, Jundi Shapur University of Medical Sciences, Ahwaz, Iran
Aida
Evazi Ziyaei
2300319475328460019689
2300319475328460019689
No
Assistant Professor, Department of Prosthodontics, School of Dentistry, Dental Branch Islamic Azad University. Tehran, Iran