Quintero E, Giunta M E, Cahuana A, Casal C
Department of Orthodontics-Paediatric Dentistry, University Hospital Sant Joan de Dèu, Barcelona, Spain.
Eur J Paediatr Dent. 2003 Jun;4(2):78-83.
The term severe infraocclusion is used to describe teeth located at the level of or below the alveolar crest and is rare.
The aims of the study were to evaluate the influence of age of diagnosis and treatment on the outcome of the successors of primary molars with severe infraocclusion and to propose a treatment protocol based on the age of diagnosis.
A retrospective study of patients with primary molars in severe infraocclusion (PMSI) in the period 1987-2001 was carried out. Parameters assessed were age, sex, degree of infraocclusion based on radiographs, altered position of adjacent and successor teeth and treatment outcome.
The sample comprised 19 patients with 23 cases of PMSI, all were second primary molars (47.8% maxillary and 52.2% mandibular). Migration of the neighbouring tooth was present in 51.5% of cases. The PMSI treatment was by extraction in all cases, a space maintainer was fitted and remained in place until the eruption of the successor. The outcome was favourable in 82.6% of cases.
Successful treatment of PMSI depends on prompt diagnosis and appropriate treatment and follow-up of the cases. The earlier the age of detection, the more favourable the outcome.
“严重低位阻生”一词用于描述位于牙槽嵴水平或其下方的牙齿，这种情况较为罕见。
本研究的目的是评估诊断和治疗年龄对严重低位阻生乳牙继承恒牙预后的影响，并根据诊断年龄提出治疗方案。
对1987年至2001年期间患有严重低位阻生乳牙（PMSI）的患者进行回顾性研究。评估的参数包括年龄、性别、基于X线片的低位阻生程度、相邻牙齿和继承恒牙的位置改变以及治疗结果。
样本包括19例患者的23例PMSI病例，均为第二乳磨牙（上颌占47.8%，下颌占52.2%）。51.5%的病例出现相邻牙齿移位。所有PMSI病例均采用拔牙治疗，安装间隙保持器并保留至继承恒牙萌出。82.6%的病例预后良好。
PMSI的成功治疗取决于及时诊断以及对病例进行适当的治疗和随访。检测年龄越早，预后越有利。
