Comparison of marginal and internal adaptation of provisional polymethyl methacrylate restorations fabricated by two three‑dimensional printers: An in vitro study
Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Background

Chairside fabrication of provisional restorations using three‑dimensional (3D) printers is rising in digital dentistry. The purpose of this research was to compare the marginal and internal adaptation of provisional polymethyl methacrylate (PMMA) restorations fabricated by two different 3D printers.

Materials and Methods

In this in vitro investigation, an intact maxillary 1st molar acrylic model was first digitalized by a laboratory scanner. It was then prepared for an all‑ceramic restoration and scanned again by the same scanner. The final restoration was designed in Exocad according to the scan files with a 50 μm cement gap. PMMA restorations were printed by two 3D printers; Group 1: Asiga (n = 10) and Group 2: Digident (n = 10). The replica technique was used to assess the marginal and internal fit of the restorations, and one‑way ANOVA was used to analyze the data. P <0.05 was regarded as statistically significant.

Results

The mean marginal gap of crowns in Group 1 was significantly lower than that of Group 2 (75 vs. 195 μm, P = 0.001). Regarding internal adaptation, no significant difference was found between the axial gap values in both groups (P > 0.05). The mean occluso‑axial gap (90 vs. 140 μm, P = 0.026) and the mean occlusal gap (116 vs. 300 μm, P = 0.001) of crowns in Group 1 were significantly smaller compared to the equivalent values in Group 2.

Conclusion

Provisional PMMA crowns fabricated by the Asiga printer showed significantly higher marginal and internal adaptation than those manufactured by Digident at all points except for the axial surface.

Language:
English
Published:
Dental Research Journal, Volume:20 Issue: 8, Aug 2023
Page:
1
magiran.com/p2617363  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!