Rajendran Ramya, Sudhakar V, Rangarajan R Sumanth, Chinnasamy Anandadevi, Vasupradha G, Jeeva J Sathiya
Department of Orthodontics, Adhiparasakthi Dental College and Hospital, Melmaruvathur, Tamil Nadu, India.
Department of Oral Pathology, Adhiparasakthi Dental College and Hospital, Melmaruvathur, Tamil Nadu, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1106-S1110. doi: 10.4103/jpbs.jpbs_259_21. Epub 2021 Nov 10.
This study aims at determining the amount of enamel decalcification in terms of microhardness.
Twenty patients requiring treatment by extraction method for Class I malocclusion with bimaxillary protrusion were selected for the study. Twenty patients were randomly divided into control group and experimental group. In the control group ( = 40), extraction of permanent first premolars was done on day 1 of bonding to assess the Vickers hardness number (VHN) of enamel surface, and in the experimental group ( = 40), extraction of the contralateral premolars was done on the 28 day after bonding to assess the VHN of enamel surface. The values are tabulated and analyzed by SPSS software.
There is significant surface enamel dissolution of enamel crystals in the experimental group compared to the control group, and a statistically significant difference in VHN is evident between the control and experimental groups. The surface enamel dissolution (VHN) is not significant difference noted between mandibular and maxillary premolars of the control and experimental groups.
The present study has demonstrated a higher level of surface enamel dissolution in the experimental group. There is a marked difference in the VHN between the control and experimental groups, which is statistically significant. The scanning electron microscopy study also confirms the presence of surface enamel demineralization following orthodontic bonding.
本研究旨在根据显微硬度确定牙釉质脱矿的量。
选取20例需要采用拔牙法治疗的双颌前突I类错牙合患者进行研究。将20例患者随机分为对照组和实验组。对照组（n = 40）在粘结第1天拔除恒牙第一前磨牙，以评估牙釉质表面的维氏硬度值（VHN）；实验组（n = 40）在粘结后第28天拔除对侧前磨牙，以评估牙釉质表面的VHN。将数据列表并用SPSS软件进行分析。
与对照组相比，实验组牙釉质晶体的表面牙釉质溶解明显，对照组和实验组之间VHN有统计学意义的显著差异。对照组和实验组的下颌和上颌前磨牙之间的表面牙釉质溶解（VHN）无显著差异。
本研究表明实验组牙釉质表面溶解水平较高。对照组和实验组之间的VHN有明显差异，具有统计学意义。扫描电子显微镜研究也证实了正畸粘结后牙釉质表面脱矿的存在。
