Evaluation of contiguous implants with cement-retained implant-abutment connections. A minipig study

Author(s)

Martins De Barros, Raquel Rezende ; Novaes Junior, Arthur Belem ; Papalexiou, Vula ; Luczyszyn, Sonia Mara ; Papalexiou Neto, Stylianos Nicolas ; Garcez Ramos, Cassiana Maria ; Goncalves De Almeida, Adriana Luisa ; Piattelli, Adriano ; Assenza, Bartolomeo

• Document type: Journal article
• Source: JOURNAL OF OSSEOINTEGRATION; v. 6, n. 1, p. 8-pg., 2014-01-01.

Abstract

Aim The presence of a microgap at the implant-abutment interface may permit bacterial contamination and lead to bone resorption, interfering with papillae formation. The present study evaluated adjacent implants with cement-retained abutments as an option to control such deleterious effects. Materials and methods Seven minipigs had their bilateral mandibular premolars previously extracted. After 8 weeks, four implants were installed in each hemi-mandible of each animal. The adjacent implants were randomly inserted on one side at the crestal bone level and on the other, 1.5 mm subcrestally. Immediately, a non-submerged healing and functional loading were provided with the abutments cementation and prostheses installation. Clinical examination and histomorphometry served to analyze the implant success. Results A total of 52 implants were evaluated at the end of the study. The subcrestal group achieved statistical better results when compared to the crestal group, clinically in papillae formation (1.97 x 1.57 mm) and histomorphometrically in crestal bone remodeling (1.17 x 1.63 mm), bone density (52.39 x 45.22%) and bone-implant contact (54.13 x 42.46%). Conclusion The subcrestal placement of cement-retained abutment implants showed better indexes of osseointegration and also improved papillae formation and crestal bone remodeling at the interimplant area after immediate loading, making them a promising option for the treatment of esthetic regions. (AU)

• FAPESP's process: 10/19737-5 - Influence of adjacent implants with cemented abutments on osseointegration, bone crest remodeling and papillae formation: clinical, radiographic, histomorphometric and nanoindentation analysis in a minipig study
• Grantee: Arthur Belem Novaes Junior
• Support Opportunities: Regular Research Grants
• FAPESP's process: 10/19035-0 - Nanoindentantion method for evaluation of contiguous implants with cemented-retained implant-abutment connections. A minipig study
• Grantee: Raquel Rezende Martins de Barros
• Support Opportunities: Scholarships in Brazil - Post-Doctoral