Korean J Orthod.  2017 Sep;47(5):323-333. 10.4041/kjod.2017.47.5.323.

Long-term survival of retained deciduous mandibular second molars and maxillary canine incorporated into final occlusion

• Hwang S
• Choi YJ
• Chung CJ
• Kim KH

• KMID: 2389148
• DOI: http://doi.org/10.4041/kjod.2017.47.5.323

Abstract

Orthodontic treatment of a complex case that involves retained deciduous mandibular second molars with missing permanent successors is challenging. Usually, congenitally missing teeth are manifested with other dental anomalies that further complicate orthodontic treatment, such as retained deciduous teeth, impactions, transpositions and peg-shaped lateral incisors. Even though the long term prognosis of the retained deciduous tooth is not fully predictable, if the teeth are in good condition, the patient and clinician may incline towards a decision to preserve the deciduous teeth as long as possible. This case report demonstrates that deciduous teeth, in this case the mandibular second molars and maxillary canine, can be incorporated into final occlusion with clinically stable long-term results.

Keyword

Agenesis; Transposition; Tooth impaction; Stability

MeSH Terms

Humans
Incisor
Molar*
Prognosis
Tooth
Tooth, Deciduous

Figure

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  Figure 1 Pretreatment facial and intraoral photographs.

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  Figure 2 Pretreatment dental casts.

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  Figure 3 Pretreatment lateral cephalogram, cephalometric tracing, and panoramic radiograph.

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  Figure 4 Intraoral photographs 1 month into treatment.

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  Figure 5 Intraoral photographs 10 months into treatment.

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  Figure 6 Intraoral photographs 18 months into treatment.

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  Figure 7 Post-treatment facial and intraoral photographs.

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  Figure 8 Post-treatment dental casts.

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  Figure 9 Post-treatment lateral cephalogram, cephalometric tracing, and panoramic radiograph.

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  Figure 10 Retention facial and intraoral photographs at 5 year follow-up.

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  Figure 11 Retention dental casts at 5 year follow up.

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  Figure 12 Retention lateral cephalogram, cephalometric superimposition (before, after treatment and after 5 years retention) and panoramic radiograph.

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