Amruta Mantri Chandak

Abstract

Introduction: Out of various ways of gaining anchorage, mini implants are gaining attention due to its minimum compliance and maximum curative effects.Mini implants are considered successful if they have sufficient primary stability that comes from mechanical interlocking of mini implant with the bone. Factors which influence the implant stability are bone physiology, implant size, shape and surface characteristics. Considering all other factors within anatomic constraints, what may play a role in primary stability of mini implants is length. Literature search to correlate mini implant length with primary stability was found to be insufficient and hence this study was undertaken. Materials and Methods: In this study, two goat jaws were subjected to spiral 3D CT scan and the areas with D2 bone density were identified and marked. In these D2 density marked areas, 30 implants of 1.5 x 6mm (GROUP A) and 30 implants of 1.5 x8mm (GROUP B) were placed. Their stability was measured by Radio Frequency Analysis using Osstell ISQ device with its Smart Peg. A connector was fabricated to make the fit of smart peg compatible with the head of mini implant. Readings were made in 5 different directions for each implant and their average value was considered as final reading. Results: It was noted that primary mini implant stability is significantly higher (p 0.034) with GROUP B implants than with GROUP A implants. Conclusion: The increased length of mini-implants positively affects its primary stability and should be taken into consideration when implants are used as anchorage devices. Keywords: Resonance Frequency Analysis, Primary stability, Length, D2 density

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Abstract

Introduction: The success of orthodontic treatment depends upon the anchorage. Mini-implants are widely been accepted as anchorage units, due to its size and convenience. However, implant failure is major concern. The placement of implant leads to micro-trauma leading to inflammation, and is found to be major reason of implant failure. Research to improve the stability of mini-implants are on rise. Platelet rich fibrin (PRF) is new generation platelet concentrate, which is found to increase the healing of tissues and hence used in trauma and surgeries. This study was undertaken to find whether PRF can enhance the stability of implant. Materials and Methods: This single blind split mouth study comprised of 16 subjects above 18 years of age. Group A (consisted of 16 implants which were coated before insertion) and group B (16 implants were normally inserted). The stability of the implant was recorded using resonance frequency analysis at insertion (T0), 24 hours (T1), 2 weeks (T2), at 4 weeks (T3), at 6 weeks and 8 weeks after insertion. Result: Statistically significant findings were found when group A was compared to group B using ANOVA test (p Conclusion: The stability of implants was found to be increased when they were coated with PRF than the normally inserted implant. Keywords: Orthodontic mini­implant, PRF, Stability, RFA

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