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Evaluation of the effect of self‐cutting and nonself‐cutting thread designed implant with different thread depth on variable insertion torques: An histomorphometric analysis in rabbits
Author(s) -
Muktadar Anand Kumar,
Gangaiah Makam,
Chrcanovic Bruno Ramos,
Chowdhary Ramesh
Publication year - 2018
Publication title -
clinical implant dentistry and related research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.338
H-Index - 85
eISSN - 1708-8208
pISSN - 1523-0899
DOI - 10.1111/cid.12611
Subject(s) - thread (computing) , torque , screw thread , implant , materials science , biomedical engineering , dentistry , surgery , medicine , engineering , mechanical engineering , physics , thermodynamics
Purpose To evaluate of the effect of self‐cutting and nonself‐cutting thread designed implant with different thread depth on variable insertion torques. To evaluate the bone volume (BV) and bone to implant contact (BIC) in these variables Materials and Methods Mainly two thread design, V‐shaped thread which is self‐cutting and power thread design, which is nonself‐cutting implants were considered for this study with a variation in thread depth of 0.4 and 0.6 mm for both the designs, respectively. A total of 32 CAD designed machined surface implant prototypes were manufactured of 4 mm in diameter and 8 mm in length were made, which were machined surfaced, which was placed in the femur of 16 New Zealand white rabbits. These were categorized under 2 groups; Group 1 and Group 2 with insertion torques of <30 and >50 Ncm, respectively. After 4 weeks of healing, rabbits were sacrificed and histomophometric and histologic analyses were done to evaluate the bone response. Results Significantly, more BIC was recorded for high torque implants compared with low torque in power‐shaped thread design ( P value = .01*). BV for new bone formation was statistically significant for V‐shaped thread design in high torque when compared with low torque ( P value = .02*). Conclusion The effect of the depth of the thread design was significant for the power‐shaped design in enhancing BIC when compared with V‐shaped thread design. With high torque V‐shaped thread design had more new bone formation as compared with power‐shaped thread design.