Restor Dent Endod.  2012 Aug;37(3):136-141. 10.5395/rde.2012.37.3.136.

Minimizing the extra-oral time in autogeneous tooth transplantation: use of computer-aided rapid prototyping (CARP) as a duplicate model tooth

• Lee SJ
• Kim E

• KMID: 1995652
• DOI: http://doi.org/10.5395/rde.2012.37.3.136

Abstract

OBJECTIVES
The maintenance of the healthy periodontal ligament cells of the root surface of donor tooth and intimate surface contact between the donor tooth and the recipient bone are the key factors for successful tooth transplantation. In order to achieve these purposes, a duplicated donor tooth model can be utilized to reduce the extra-oral time using the computer-aided rapid prototyping (CARP) technique.
MATERIALS AND METHODS
Briefly, a three-dimensional digital imaging and communication in medicine (DICOM) image with the real dimensions of the donor tooth was obtained from a computed tomography (CT), and a life-sized resin tooth model was fabricated. Dimensional errors between real tooth, 3D CT image model and CARP model were calculated. And extra-oral time was recorded during the autotransplantation of the teeth.
RESULTS
The average extra-oral time was 7 min 25 sec with the range of immediate to 25 min in cases which extra-oral root canal treatments were not performed while it was 9 min 15 sec when extra-oral root canal treatments were performed. The average radiographic distance between the root surface and the alveolar bone was 1.17 mm and 1.35 mm at mesial cervix and apex; they were 0.98 mm and 1.26 mm at the distal cervix and apex. When the dimensional errors between real tooth, 3D CT image model and CARP model were measured in cadavers, the average of absolute error was 0.291 mm between real teeth and CARP model.
CONCLUSIONS
These data indicate that CARP may be of value in minimizing the extra-oral time and the gap between the donor tooth and the recipient alveolar bone in tooth transplantation.

Keyword

Computer-aided rapid prototyping; Donor tooth; Extra-oral time; Tooth model; Tooth transplantation

MeSH Terms

Cadaver
Carps
Cervix Uteri
Dental Pulp Cavity
Female
Humans
Periodontal Ligament
Tissue Donors
Tooth
Transplants

Figure

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  Figure 1 (a) A 12-year old male patient visited for reposition of the avulsed tooth (center). The extra-oral time before reposition was about two hours; (b) Root of the repositioned tooth became severely resorbed after 4 years; (c) Extracted tooth showed almost no root structure left.

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  Figure 2 (a) Bucco-lingual cross-sections show the bucco-lingual dimension; (b) Distance between the alveolar crest and the mandibular canal; (c) 3-D images with the real dimensions of donor tooth.

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  Figure 3 (a) 3-D CT image; (b) extracted donor tooth; (c) computer-aided prototyped model (starch).

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  Figure 4 Measurement (width) example: MC, mesio-cervical; MA, mesio-apical; DC, disto-cervical; DA, disto-apical.

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