Talekar Abhinav, Chaudhari Gayatri, Mallineni Sreekanth Kumar, Kothare Sneha, Patil Amol, Musale Prasad, Chunawala Yusuf, Choubey Shikha
Department of Pediatric and Preventive Dentistry, M.A. Rangoonwala College of Dental Science and Research Center, Pune, India.
Department of Preventive Dental Science, College of Dentistry, Majmaah University, AlMajmaah 11952, Saudi Arabia.
Int J Dent. 2021 Dec 20;2021:9670982. doi: 10.1155/2021/9670982. eCollection 2021.
The main purpose of the study was to assess the material wear, antagonistic natural primary teeth wear, and microhardness of zirconia (ZR), a recently launched novel glass-fiber-reinforced composite crown (GFRC). The research question was, are these aesthetic crowns resulting in antagonistic natural primary tooth wear and the crown material itself?
Forty-five primary canines were divided into three groups (15 per group) and mounted against Zr (Group A), GFRC (Group B), and natural teeth as control (Group C) in the wear test machine. All samples were assessed for surface wear with pre- and post-3-dimensional scanning. In addition, microhardness was assessed for all three groups.
The mean microhardness value for the Zr disc was 1157 ± 7 HV; for the GFRC disc, it was 29.35 ± 2 HV; while with natural teeth, it was 105 ± 4 HV. There was a statistically significant difference in teeth wear in the prescan and postscan in the natural tooth ( < 0.05) group, highly significant difference ( < 0.001) in the ZR group, and no significant difference in the GFRC group.
There is more significant wear loss of glass-fiber-reinforced composite discs as compared to zirconia. In addition, the wear of the antagonistic tooth with zirconia and natural teeth is more remarkable than with GFRC. There is a vast difference of microhardness between natural teeth and zirconia (almost 10 times higher) which suggests further scope of study. . Pediatric dentistry deals with the transition of dentition from primary to permanent through mixed dentition. Selection of restorative material needs to be done cautiously when we are dealing with primary teeth and young permanent teeth as antagonistic teeth. Wear of the crown material itself and opposing natural teeth are essential factors that should be considered in selecting crowns in clinical practice. The present study results can be extrapolated to clinical practice, and the practitioner can consider various factors in selecting full-coverage crowns for primary teeth. The vast difference in aesthetic crowns and natural teeth microhardness indicates a further need for research. Additionally, there is no literature published for the recently launched GFRCs.
本研究的主要目的是评估一种最近推出的新型玻璃纤维增强复合冠（GFRC）——氧化锆（ZR）的材料磨损、天然乳牙的对颌磨损以及显微硬度。研究问题是，这些美观的冠是否会导致天然乳牙对颌磨损以及冠材料本身的磨损？
将45颗乳尖牙分为三组（每组15颗），并在磨损试验机中与ZR（A组）、GFRC（B组）相对安装，以及以天然牙作为对照（C组）。所有样本在三维扫描前后均进行表面磨损评估。此外，对所有三组样本进行显微硬度评估。
ZR盘的平均显微硬度值为1157±7 HV；GFRC盘为29.35±2 HV；而天然牙为105±4 HV。天然牙组在扫描前和扫描后的牙齿磨损存在统计学显著差异（P<0.05），ZR组存在高度显著差异（P<0.001），GFRC组无显著差异。
与氧化锆相比，玻璃纤维增强复合盘的磨损损失更显著。此外，氧化锆和天然牙导致的对颌牙磨损比GFRC更明显。天然牙和氧化锆之间的显微硬度存在巨大差异（几乎高出10倍），这表明有进一步的研究空间。儿童牙科涉及从乳牙列到混合牙列再到恒牙列的牙列转变。当我们处理乳牙和年轻恒牙作为对颌牙时，修复材料的选择需要谨慎。冠材料本身和对颌天然牙的磨损是临床实践中选择冠时应考虑的重要因素。本研究结果可外推至临床实践，从业者在为乳牙选择全冠时可考虑各种因素。美观冠与天然牙显微硬度的巨大差异表明进一步研究的必要性。此外，对于最近推出的GFRCs尚无相关文献发表。
