Jain Sandhya
Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Government College of Dentistry , Indore, Madhya Pradesh, India .
J Clin Diagn Res. 2016 Sep;10(9):ZC34-ZC36. doi: 10.7860/JCDR/2016/18668.8459. Epub 2016 Sep 1.
Human teeth has always been known for morphological variations in both the crown and root structures. The corono-morphological variations can be in the form of extra cusp or missing cusp. Permanent maxillary first molars are the biggest teeth in maxillary arch and have a high anchorage value and are known for their four cusp and five cusp patterns, if present with cusp of Carebelli.
The aim of this study was to determine the prevalence of cuspal variations and quantification of cusps of permanent maxillary first molar in Malwa population.
A total of 1249 individuals were studied at Government College of Dentistry, Indore, Madhya Pradesh, India, to evaluate the number of cusps in permanent maxillary first molars.
Of the studied 1249 individuals, permanent maxillary first molars had five cusps in 407 (32.6%) cases while 838 (67.08%) cases had four cusp and four (0.32%) cases had three cusps. The four cases having three cusp permanent maxillary first molars were present unilaterally and only in females.
This article emphasizes the presence of permanent maxillary first molar with only three cusps in the Malwa population of India. It also reviews the literature in respect to this rare anomaly and calls for continuous and close monitoring to report such cases in the future.
人类牙齿的冠部和根部结构一直以形态变异而闻名。冠部形态变异可以表现为额外的牙尖或缺失的牙尖。恒牙上颌第一磨牙是上颌牙弓中最大的牙齿，具有较高的固位价值，并且以其四尖和五尖模式而闻名，如果存在卡氏尖的话。
本研究的目的是确定马尔瓦人群中恒牙上颌第一磨牙牙尖变异的患病率以及牙尖的量化。
在印度中央邦印多尔市政府牙科学院对总共1249名个体进行了研究，以评估恒牙上颌第一磨牙的牙尖数量。
在研究的1249名个体中，恒牙上颌第一磨牙有五尖的情况在407例（32.6%）中出现，而838例（67.08%）有四尖，4例（0.32%）有三尖。有三尖恒牙上颌第一磨牙的这4例均为单侧出现，且仅见于女性。
本文强调了在印度马尔瓦人群中存在仅具有三个牙尖的恒牙上颌第一磨牙。它还回顾了关于这种罕见异常的文献，并呼吁在未来持续密切监测以报告此类病例。
