Does relative bracket base area affect the accuracy of reconstructed buccal surface in the virtual bracket removal technique?

IF 2.6 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE
Peiqi Wang, Liwei Zhu, Liandi Cheng, Runzhe Xiang, Junyan Leng, Siyuan Hu, Ding Bai, Yipeng Wang, Chaoran Xue
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Abstract

Background: Virtual bracket removal (VBR) facilitates efficient retainer fabrication for fixed orthodontics in a digital workflow. This study is aimed at assessing the influence of the relative bracket base area (RBA), representing the proportion of the labial/buccal surface area intended for removal, on the surface reconstruction accuracy in the VBR technique.

Methods: 196 teeth from seven resin dental models were included. The maximal bracket base surface area (MBA) was determined by the rectangular area extending to the lateral edges of the tooth labial/buccal surface. On each tooth, diverse RBA percentages (20-100% in 10% increments) of the MBA was removed, respectively. Following removal, the buccal surfaces of the teeth were digitally reconstructed. Subsequently, the root mean square (RMS) values, which represent the surface deviations between the reconstructed and original dentitions was calculated for each tooth. The obtained RMS values were compared within and among groups of different RBAs and compared with the clinically acceptable limit (CAL) of 0.05 mm.

Results: As the RBA increased, there was a discernible trend of elevated RMS values, both for the overall dentition and each specific tooth type. Among the lower teeth, the molars consistently displayed the highest RMS values in almost all groups, with significantly higher mean/median RMS values compared to the lower incisors (P < 0.05), excluding the 0.2MBA group. Specifically, across all tooth types, the mean/median RMS values in groups with 20-80% MBA were significantly lower than CAL of 0.5 mm (P < 0.05). This trend persisted for all tooth types in the 0.9MBA group except the lower canines and molars.

Conclusion: The mean/median RMS values elevated as the RBA increased. VBR technique remains sufficiently accurate for retainer fabrication, provided that the RBA remains below 80% of the MBA for lower canines and molars and 90% for all the other tooth types. Notably, residual bonding materials should be considered in clinical use because they are also removed in VBR and thereby constitute a portion of RBA.

在虚拟托槽去除技术中,相对托槽基底面积是否会影响重建颊面的准确性?
背景:虚拟托槽去除(VBR)有助于在数字化工作流程中高效制作固定矫治器。本研究旨在评估相对托槽基底面积(RBA)对 VBR 技术表面重建精度的影响。最大托槽基底表面积(MBA)由延伸至牙唇/颊面外侧边缘的矩形区域确定。在每颗牙齿上,分别去除不同 RBA 百分比(20%-100%,递增 10%)的 MBA。去除后,对牙齿的颊面进行数字化重建。随后,计算每颗牙齿的均方根(RMS)值,该值代表重建后的牙齿表面与原始牙齿表面之间的偏差。将获得的均方根值在不同 RBA 的组内和组间进行比较,并与临床可接受限值(CAL)0.05 毫米进行比较:结果:随着 RBA 的增加,整个牙列和每种特定牙齿的 RMS 值都有明显的升高趋势。在下牙中,磨牙的 RMS 值在几乎所有组别中都是最高的,与下门牙相比,磨牙的 RMS 平均值/中值明显更高(P 结论:随着 RBA 的增加,磨牙的 RMS 平均值/中值明显高于下门牙(P 结论:磨牙的 RMS 平均值/中值明显高于下门牙):随着 RBA 的增加,平均/中位 RMS 值也随之升高。如果下犬齿和臼齿的 RBA 保持在 MBA 的 80% 以下,所有其他类型牙齿的 RBA 保持在 90% 以下,那么 VBR 技术在制作保持器方面仍然足够精确。值得注意的是,在临床使用中应考虑残留粘结材料,因为它们也会在 VBR 中被去除,从而构成 RBA 的一部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BMC Oral Health
BMC Oral Health DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
3.90
自引率
6.90%
发文量
481
审稿时长
6-12 weeks
期刊介绍: BMC Oral Health is an open access, peer-reviewed journal that considers articles on all aspects of the prevention, diagnosis and management of disorders of the mouth, teeth and gums, as well as related molecular genetics, pathophysiology, and epidemiology.
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