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首页> 外文期刊>Acta odontologica Scandinavica. >Autotransplantation of maxillary second premolars to mandibular recipient sites where the primary second molars were impacted, predisposes for complications
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Autotransplantation of maxillary second premolars to mandibular recipient sites where the primary second molars were impacted, predisposes for complications

机译：将上颌第二前磨牙自体移植到下颌第二磨牙受累的下颌接受部位，易患并发症

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Objective. The aim of the study was to elucidate whether ankylosis of a transplanted permanent tooth can be predicted based on an evaluation of the primary and permanent dentitions. Materials and methods. The study comprised 162 maxillary second premolars and 49 third molars transplanted to the mandibular second premolar region in 157 patients treated in the period 1980-2003. Selection criteria: panoramic radiograph available; agenesis of the mandibular permanent premolar/s; persistence of the primary molar at the recipient site. The 211 transplanted teeth were observed for a period of between 1-29 years. Results. Seven per cent (95% confidence interval, CI = 3-11%) of the transplanted second premolars ankylosed during the first 10 years after operation. The success rate for transplantation of the third molar to the mandibular second premolar region was significantly lower (p = 0.001), as 40% (95% CI = 24-57%) of the third molars had ankylosed 10 years after operation. A significant association (p = 0.022) was found between ankylosis of a second premolar and infra-position of the primary second molar located at the recipient site. The infraposition group had 13% (CI = 4-23%) ankylosis after 10 year, whereas the non-infraposition group had 5% (CI = 1-9%) ankylosis after 10 years. Conclusions. The present study concludes that there is an increased risk of ankylosis of the transplanted permanent tooth if the primary tooth at the recipient site is in infraposition. This observation may be decisive for treatment planning, especially in young individuals in whom excessive growth of the alveolar process is expected from the cephalometric analysis.
机译：目的。这项研究的目的是阐明是否可以基于对原牙和永久牙列的评估来预测移植的恒牙的强直性。材料和方法。该研究包括1980年至2003年间治疗的157例患者的162例上颌第二前磨牙和49例第三磨牙。选择标准：可提供全景X射线照片;下颌永久性前磨牙的发育不全;受体部位的第一磨牙的持久性。观察到211颗移植牙齿的时间为1-29年。结果。在手术后的前10年中，有7％（95％置信区间，CI = 3-11％）被移植的第二前磨牙被强直。将第三磨牙移植到下颌第二前磨牙区的成功率显着降低（p = 0.001），因为40％（95％CI = 24-57％）的第三磨牙在手术后十年被强直。在第二前磨牙的强直与位于受体部位的第二磨牙的位置不足之间发现了显着的关联（p = 0.022）。基础设施组在10年后有13％（CI = 4-23％）的强直性，而非基础设施组在10年后有5％（CI = 1-9％）的强直性。结论本研究的结论是，如果受者部位的乳牙位于基础部位，则移植的恒牙发生强直的风险会增加。该观察结果对于治疗计划可能具有决定性意义，尤其是对于那些从头颅测量分析中预计牙槽突过度生长的年轻人。

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