The combination of EMD and PDGF-BB produces greater proliferative and wound-fill effects on PDL cells than each by themselves. If these combined effects can be translated clinically, one may see greater regeneration in periodontal defects with this combination. However, amelogenin does not have significant effects on PDL cell proliferation or migration by itself. This may suggest that either another enamel matrix component in EMD may be responsible for some of its clinical effects, or that amelogenin alone may not trigger the regenerative potential of periodontal tissues and that it requires a combined interaction with other enamel matrix components of EMD to direct the regenerative process.
The prevalence of dental implants among Air Force basic military trainees was 0.24% with 54% of the implants being identified as Nobel Biocare/3i type.
Aim:The purpose of this in vitro investigation was to evaluate the sealing capability of the conical implant-abutment interfaces under different abutment screw torque values using titanium and zirconia abutments with Morse taper designs.
Materials and methods:A total of 42 dental implants (n = 21 for titanium abutments and n = 21 for zirconia abutments) were inoculated internally with three bacteria. These assemblies were divided into four test groups (n = 10) based on screw fixation torques of 35 or 20 Ncm and placed in sterile broth; the remaining abutments were used as positive controls and torqued to 10 Ncm. Microleakage was quantified by enumerating the bacteria from the colony-forming units. An analysis of variance for the estimates of bacteria enumerated and microgaps was used with a post hoc analysis as indicated. A p-value of 0.05 was used as the level of significance.Results: There was no statistically significant difference in microleakage among the four test groups; there were no significant effects of screw torque or abutment type on the bacteria enumerated. There was a significantly smaller mean microgap with the zirconia abutments.
Evaluation of the Sealing
Conclusion:The results of this study indicated no statistically significant difference in the sealing capabilities between titanium and zirconia abutments, having internal conical connections, after increasing the abutment screw torque.Clinical significance: It is important for clinicians to follow the guidelines suggested by the implant companies to avoid biomechanical complications over time.
Introduction
The goal of stage 2 implant surgery is to uncover implants while maintaining or augmenting the peri‐implant keratinized tissue. Although the absolute requirement for keratinized tissue around natural teeth can be debated, implants appear to have consistently improved postoperative clinical parameters and health when there is an adequate keratinized peri‐implant tissue.
Case Presentation
This article presents a new technique to optimize the keratinized tissue around implants during stage 2 surgery. Although there are many treatment options that can be considered at the time of surgery, the technique presented here has the advantage of increasing the keratinized tissue circumferentially around the implant without using a second donor site. The technique, called the “pinwheel,” is presented in two cases with the same clinical presentation. Two mandibular overdenture patients with ≤3 mm of keratinized tissue over implant sites, stage 2 surgery was performed using the “pinwheel technique” to increase the keratinized tissue on the facial and lingual surfaces.
Conclusion
The use of the pinwheel technique to augment keratinized tissue around implants is effective and is a viable treatment option during stage 2 implant surgery.
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