Is infraocclusion always caused by ankylosis? Current perspectives on primary molar ankylosis: A systematic review
Masatoshi Otsugu, Hamada Masakazu, Fumikazu Tojo, Kazuhiko Nakano · 2026
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Description
Masatoshi Otsugu and three co-authors reviewed in 2026 whether sunken baby molars are always fused to the jaw bone. Such teeth, sitting below the bite line, are common while adult teeth come in, and fusion is the usual suspect. The team searched three databases under standard review rules and kept fourteen studies. Reported rates of sunken baby molars ranged widely, from about one percent to a quarter of children.
Tissue and clinical studies showed that not every sunken molar is actually fused. Treatment choices varied with how deep the tooth sat and whether a successor tooth existed. The authors say the evidence cannot yet settle which comes first, fusion or sinking. They frame sinking as possibly a wider eruption disturbance. More studies of causes, tissue signs and outcomes are needed.
Catalog record
| CREATOR | Masatoshi Otsugu, Hamada Masakazu, Fumikazu Tojo, Kazuhiko Nakano |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 60 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |