Accuracy of Two Stereolithographic Guide Systems for Computer-Aided Implant Placement: A Computed Tomography-Based Clinical Comparative Study

Background: Stereo lithographic surgical guides provide significant benefits during the simultaneous placement of multiple implants with regard to the final prosthetic plan. However, deviation from the planning poses a significant risk. Deviations of implants that were placed by bone-, tooth-, and mucosa-supported stereolithographic surgical guides were examined in this study

HISTOLOGIC AND HISTOMORPHOMETRIC EVALUATION OF A HYDROPHILIC BLASTED AND ACID-ETCHED IMPLANT: AN EXPERIMENTAL STUDY IN SHEEP TIBIA

The aim of this study was to evaluate the early term osseointegration period of a modified sand-blasted and acid-etched (modSLA) implant in an experimental animal model. A total of 30 implants were placed to the tibiae of 3 sheep and insertion torque value (ITV) and resonance frequency analysis (RFA) measurements were performed. RFA measurement was repeated on 3 and 6 weeks healed implants which the animals were also sacrificed for histomorphometric analysis. Bone-to-implant contact was assessed on non-decalcified sections. Six weeks healed implants were also subjected to reverse torque test (RTT). Results were analyzed by analysis of variance (ANOVA) and Pearson correlation tests. All implants reached to strong primary stability with a mean 35.47 +/- 2.85 N/cm ITV and 71.60 +/- 2.87 RFA values for modSLA implants. After 3 weeks of healing, mean BIC% (80.64 +/- 13.89%) and RFA value (76.80 +/- 1.14) of modSLA implants were higher than of standard implants (64.39 +/- 21.2 BIC% and 74.20 +/- 4.76 RFA) and the differences were statistically significant. The differences were no more significant after 6 weeks of healing as confirmed by the RTT test (115.2 +/- 4.14 and 117.0 +/- 4.47 N/cm for standard and modSLA implants respectively, p=0.55). No correlations were found between any of the investigated parameters. Within the limits of this pilot study it can be concluded that modSLA implants achieves higher bone contact and stability at earlier time points compared to standard implants

Osseointegration and stability of a modified sand-blasted acid-etched implant: an experimental pilot study in sheep

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