Hedayati Zohreh, Dashlibrun Yunes Nazari
Orthodontic Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Eur J Dent. 2013 Sep;7(Suppl 1):S078-S082. doi: 10.4103/1305-7456.119080.
To evaluate the pattern and prevalence of hypodontia and its association with different malocclusions among orthodontic patients in southern Iran.
In this study, a total of 494 records of orthodontic patients (162 males, 332 females) were evaluated. To investigate percent of hypodontia pertinent information of patients was evaluated. Chi-square and Fisher's exact tests were used for statistical analysis.
The prevalence of tooth agenesis was 7.66%. Thirty-eight patients were found to have at least one tooth missing. Number of patients having hypodontia was the most in class III patients, whereas the number of missing teeth was more in class II sample. However, it was not statistically significant (P = 0.569). Upper lateral incisor (27.95%), lower second premolar (21.51%), and upper first premolar (12.9%) were respectively the most frequently absent teeth. There was not statistically significant difference between sexes (P = 0.580). Hypodontia observed to be more bilaterally, in the upper arch and in the left side.
The pattern and prevalence of hypodontia is different among races and ethnic groups. In our study population, hypodontia was found to be 7.66%. Higher prevalence of hypodontia in the maxillary arch and in class III patients may be considered as an etiologic factor.
评估伊朗南部正畸患者中缺牙症的模式和患病率及其与不同错牙合畸形的关联。
本研究共评估了494例正畸患者的记录（男性162例，女性332例）。为调查缺牙症的百分比，对患者的相关信息进行了评估。采用卡方检验和Fisher精确检验进行统计分析。
牙齿发育不全的患病率为7.66%。发现38例患者至少有一颗牙齿缺失。Ⅲ类患者中患缺牙症的人数最多，而Ⅱ类样本中缺失牙齿的数量更多。然而，差异无统计学意义（P = 0.569）。上颌侧切牙（27.95%）、下颌第二前磨牙（21.51%）和上颌第一前磨牙（12.9%）分别是最常缺失的牙齿。性别之间差异无统计学意义（P = 0.580）。缺牙症在双侧、上颌弓和左侧更为常见。
缺牙症的模式和患病率在不同种族和民族中有所不同。在我们的研究人群中，缺牙症的患病率为7.66%。上颌弓和Ⅲ类患者中较高的缺牙症患病率可被视为一个病因因素。
