Premolar autotransplantation in orthodontic treatment : a clinical and radiographic long-term study
Author: Paulsen, Hans Ulrik
Date: 1999-12-10
Location: Föreläsningssal 1, plan 4, Odontologiska institutionen
Time: 9.00
Department: Institutionen för odontologi / Department of Odontology
Abstract
Premolar aplasia and avulsed or malformed anterior teeth are common in
young people. Using autotransplantation, it is possible to move problems
in the dental arches to regions where they are more easy to solve
orthodontically. In a long-term study, 370 premolars were evaluated by a
standardised technique for monitoring pulp and periodontal healing, root
development and root resorption subsequent to transplantation and
orthodontic rotation. It was realised that the stage of root development
at the time of grafting was the most important single factor determining
successful healing. Transplantation of premolars with three quarters root
formation or full root formation with wide-open apical foramina provides
the best prognosis for long-term survival. Furthermore, evaluation of 118
premolars by radiographic assessment and evaluation of pulp canal
obliteration showed evidence of pulp healing earlier than electrometric
pulp testing. Orthodontic rotation resulted in slight surface root
resorption and a significantly shorter root. It was suggested that the
occurrence of pulp necrosis subsequent to orthodontic rotation is due to
damage to eccentrically located apical blood vessels, especially in the
late stages of pulp canal obliteration. It was further suggested that
rotation should be postponed until after pulp and periodontal healing has
taken place but before pulp canal obliteration, i.e. 3-9 months after
transplantation.
A new colour-coding technique was developed, making it possible to
visualise changes that take place after premolar transplantation.
Radiographs from the same sequence were digitised and then transformed
into monochromatic images: red, blue and green. To combine the
information in three monochromatic images into one polychromatic image,
the colour-coding method offers the possibility of identifying
radiographic changes that take place over time, such as bone healing,
modelling and remodelling, and root development. The method was applied
to 14 autotransplanted premolars and controls in a comparison study of
tooth eruption and root development. The eruption speed of transplants
and controls in relation to the first molar was found to be similar in
the long term. However, the initial eruption of transplants seemed to be
faster. Eruption of transplants does not seem to be related to root
growth.
List of papers:
I. Andreasen JO, Paulsen HU, Yu Z, Ahlquist R, Bayer T, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part I. Surgical procedures and standardized techniques for monitoring healing" Eur J Orthod 12(1): 3-13
Pubmed
II. Andreasen JO, Paulsen HU, Yu Z, Bayer T, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part II. Tooth survival and pulp healing subsequent to transplantation" Eur J Orthod 12(1): 14-24
Pubmed
III. Andreasen JO, Paulsen HU, Yu Z, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part III. Periodontal healing subsequent to transplantation" Eur J Orthod 12(1): 25-37
Pubmed
IV. Andreasen JO, Paulsen HU, Yu Z, Bayer T (1990). "A long-term study of 370 autotransplanted premolars. Part IV. Root development subsequent to transplantation" Eur J Orthod 12(1): 38-50
Pubmed
V. Paulsen HU, Andreasen JO, Schwartz O (1995). "Pulp and periodontal healing, root development and root resorption subsequent to transplantation and orthodontic rotation: a long-term study of autotransplanted premolars" Am J Orthod Dentofacial Orthop 108(6): 630-640
Pubmed
VI. Papika S, Paulsen HU, Shi XQ, Welander U, Linder-Aronson S (1999). "Orthodontic application of color image addition to visualize differences between sequential radiographs" Am J Orthod Dentofacial Orthop 115(5): 488-93
Pubmed
VII. Paulsen HU, Shi XQ, Welander U, Huggare J (1999). "Eruption patterns of autotransplanted premolars visualized by radiographic color-coding" Am J Orthod Dentofacial Orthop (Accepted)
I. Andreasen JO, Paulsen HU, Yu Z, Ahlquist R, Bayer T, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part I. Surgical procedures and standardized techniques for monitoring healing" Eur J Orthod 12(1): 3-13
Pubmed
II. Andreasen JO, Paulsen HU, Yu Z, Bayer T, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part II. Tooth survival and pulp healing subsequent to transplantation" Eur J Orthod 12(1): 14-24
Pubmed
III. Andreasen JO, Paulsen HU, Yu Z, Schwartz O (1990). "A long-term study of 370 autotransplanted premolars. Part III. Periodontal healing subsequent to transplantation" Eur J Orthod 12(1): 25-37
Pubmed
IV. Andreasen JO, Paulsen HU, Yu Z, Bayer T (1990). "A long-term study of 370 autotransplanted premolars. Part IV. Root development subsequent to transplantation" Eur J Orthod 12(1): 38-50
Pubmed
V. Paulsen HU, Andreasen JO, Schwartz O (1995). "Pulp and periodontal healing, root development and root resorption subsequent to transplantation and orthodontic rotation: a long-term study of autotransplanted premolars" Am J Orthod Dentofacial Orthop 108(6): 630-640
Pubmed
VI. Papika S, Paulsen HU, Shi XQ, Welander U, Linder-Aronson S (1999). "Orthodontic application of color image addition to visualize differences between sequential radiographs" Am J Orthod Dentofacial Orthop 115(5): 488-93
Pubmed
VII. Paulsen HU, Shi XQ, Welander U, Huggare J (1999). "Eruption patterns of autotransplanted premolars visualized by radiographic color-coding" Am J Orthod Dentofacial Orthop (Accepted)
Issue date: 1999-11-19
Publication year: 1999
ISBN: 91-628-3850-4
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