Soviero Vera, Haubek Dorte, Trindade Carolina, Da Matta Thais, Poulsen Sven
Department of Preventive and Community Dentistry, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro, Brazil.
Acta Odontol Scand. 2009;67(3):170-5. doi: 10.1080/00016350902758607.
To determine the prevalence of demarcated opacities in permanent 1st molars and incisors in 7 to 13-year-old Brazilian children.
The study population comprised 292 children from a middle social class public school in Rio de Janeiro, Brazil. Children with all 1st permanent molars erupted were eligible for participation. Clinical examination was performed by two calibrated examiners who recorded demarcated opacities, post-eruptive breakdown, atypical restorations, and extractions due to demarcated opacities. Forty-three children had at least one molar that could not be examined, which left 249 children for the data analysis.
One hundred children (40.2%) had one or more 1st molars with demarcated opacities with a mean number of 1.98 (SD 1.09) affected molars. The number of affected incisors increased with increasing number of affected molars. Twenty-two (18.6%) of 118 children with unaffected 1st molars had affected incisors. Demarcated opacities were the most frequent defect, and 1st molars and upper central incisors were the most frequently affected teeth. Among children with demarcated opacities in 1st molars, 20 (20%) had post-eruptive breakdown.
A high prevalence of demarcated opacities, possibly resulting in disintegration of the tooth crown, has been found in Brazilian children.
确定巴西7至13岁儿童恒牙第一磨牙和切牙中界限清晰的混浊的患病率。
研究人群包括来自巴西里约热内卢一所中产阶级公立学校的292名儿童。所有第一恒磨牙萌出的儿童有资格参与。由两名经过校准的检查人员进行临床检查，他们记录界限清晰的混浊、萌出后牙体破坏、非典型修复以及因界限清晰的混浊导致的拔牙情况。43名儿童至少有一颗磨牙无法检查，因此留下249名儿童进行数据分析。
100名儿童（40.2%）有一颗或多颗第一磨牙存在界限清晰的混浊，受影响磨牙的平均数量为1.98颗（标准差1.09）。受影响切牙的数量随着受影响磨牙数量的增加而增加。118名第一磨牙未受影响的儿童中有22名（18.6%）切牙受影响。界限清晰的混浊是最常见的缺陷，第一磨牙和上颌中切牙是最常受影响的牙齿。在第一磨牙有界限清晰的混浊的儿童中，20名（20%）出现了萌出后牙体破坏。
在巴西儿童中发现界限清晰的混浊患病率很高，这可能导致牙冠崩解。
