Evaluation of bone formation around External-hexagon x Morse-taper implants

Method: Four premolars in the lower jaw of 07 mongrel dogs were extracted and 4 immediate implants were placed,  totaling 28 implants. The groups were divided according to the type of prosthetic connection, placing a morse-taper implant (2 mm below the bone crest) and other external-hexagon (at the bone crest level) on each side of the dog jaw. After 4 months of surgery a histomorphometric analysis was performed in order to observe: Total BIC and total area of all implants. For statistical analysis the Kruskal-Wallis test (p < 0.05) was used.

Result: The morse-taper implants had a higher BIC when compared to external-hexagon implants. Regarding the bone area formation around implants, there was no statistically significant difference between the two types of prosthetic connection.

Conclusion: With this study it was concluded that the morse-taper implants have a higher BIC to the external-hexagon implants, and this fact is probably related with the positioning below the bone crest and consequently, with the maintenance of the original bone crest in these implants.