Digital subtraction radiography evaluation of longitudinal bone density changes around immediate loading implants: a pilot study
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Data
2012
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Resumo
Objective: The aim of this study was to assess longitudinal quantitative changes in bone
density around different implant loading protocols and implant surfaces measured by digital
subtraction radiography (DSR).
Methods: 12 patients received bilateral homologous standard and TiUniteH (Nobel Biocare,
Kloten, Switzerland) single-tooth implants under 2 implant—loading protocols: immediate
loading (8 patients, 16 implants, 12 maxillary) and conventional loading (4 patients, 8
implants, 4 maxillary). Standardized periapical radiographs were taken immediately after
implant placement (baseline image) and at the 3-month, 6-month and 12-month follow ups.
Radiographic images were digitized and submitted to digital subtraction using the DSR
systemH (Electro Medical System, Nyon, Switzerland), resulting in three subtracted images.
Quantitative analysis of bone density was performed using Image ToolH software (University
of Texas Health Science Centre, San Antonio, TX) to assess pixel value changes in five areas
around the implants (crestal, subcrestal, medial third, apical–lateral and apical).
Results: Repeated-measures analysis of variance showed that grey levels were significantly
influenced by follow-up time and implant-loading protocol. A linear increase in grey levels
was found for immediate loading (IML) implants and a significant decrease in grey levels was
observed in the 12-month follow up for conventional loading implants. No effect of implant
surface treatment was observed.
Conclusion: In conclusion, IML protocol induced mineral bone gain around single-tooth
implants after the first year under function for cases with favourable bone conditions.
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Palavras-chave
Subtraction technique, Osseointegration, Dental implants
Citação
CARNEIRO, L. S.; CUNHA, H. A. da; LELES, C. R.; MENDONÇA, E. F. Digital subtraction radiography evaluation of longitudinal bone density changes around immediate loading implants: a pilot study. Dentomaxillofacial Radiology, London, v. 41, n. 3, p. 241-247, 2012.