A long-term study of 370 autotransplanted premolars. Part IV. Root development subsequent to transplantation

Abstract

The purpose of the present study was to analyse the extent of root development subsequent to transplantation in a material of 370 transplanted premolars. Before transplantation, the grafts were classified according to stage of root development (i.e. quarters of root length and constriction of the apical foramen) and length of tooth development (measured in mm from the cusp tip to the apical foramen). At radiographic controls the extent of root formation was registered. These figures were compared to the final tooth length of 288 non-transplanted premolars from the present material as well as to tooth length determinations of 534 premolars extracted for orthodontic purposes. Furthermore, intra-individual and inter-individual differences in tooth length were examined in a skull material with 40 pairs of premolars. These method studies indicated that root growth was probably determined genetically with great right-left accuracy and variation related to location of premolar (maxilla or mandible) and sex. A statistical analysis of the transplant material revealed that stage as well as length of tooth development assessed prior to transplantation were significantly related to final tooth length after transplantation. In most cases of transplantation performed at early stages of root development, a reduction in the final root length was seen. When a qualitative analysis of root development was performed in teeth with incomplete root formation at the time of transplantation, and where a homologous non-transplanted premolar was present, it was found that 14 per cent showed total arrest of root formation, 65 per cent partial arrest whereas 21 per cent showed no arrest (i.e. normal root formation). Premolars in ectopic position in the mandible before transplantation showed a significantly reduced root growth compared to matched pairs with normal position of the tooth graft. The present study indicated that no, partial or total damage to the Hertwig's epithelial root sheath was probably the explanatory factor for variations in root growth.

Auto Transplantation of a Mandibular Third Molar with Complete Root Development - A Case Report?

“…Avoidance of trauma is also important for the success of the transplant. Otherwise, trauma will become an extra cause of impaired healing [30][31][32]. Success is defined as normal periapical healing, without any inflammatory pulpal changes or progressive root resorption [4].…”

Orthodontic treatment after autotransplantation

“…Andreasen et al [14][15][16][17] reported survival rates of more than 90% in a comprehensive study, but only a few of their transplants had an observation period of more than 10 years. The most complications associated with autotransplantation are ankylosis and root resorption.…”

Relationship between Dental Trauma and Orthodontic Tooth Movement

“…ODT'de dişlerin sağ kalım oranları yüksek olmasına rağmen rezorpsiyon ve ankiloz gibi bazı istenmeyen komplikasyonlar görülmektedir (30). İşlem sırasında oluşan periodontal ligamentte hasar, ototransplantasyon sonrası 4 haftadan, 8 haftaya kadar klinik veya radyografik olarak teşhis edilebilen kök rezorbsiyonuna neden olabilir.…”

“…İşlem sırasında oluşan periodontal ligamentte hasar, ototransplantasyon sonrası 4 haftadan, 8 haftaya kadar klinik veya radyografik olarak teşhis edilebilen kök rezorbsiyonuna neden olabilir. Kök gelişimi tamamlanmış böyle dişlere sonrasında uygulanan ortodontik tedavi, hem yüzeysel hem de iltihabi kök rezorpsiyonu meydana gelmesinde hafif bir artış ile sonuçlanmıştır (30 …”