A total of 93 litters produced from 36 does pedigreed by 13 dams and 9 sires, were analyzed using Animal Model Procedure (MTDFREML). Traits assessed were Litter Size traits, at birth, LSB; at 21 days, LS21 and at weaning, LSW (at 35 days) on two consecutive years. Heritability estimates of all considered litter traits were low. Genetic correlations among LSB and LSW were moderate and positive (0.490). The ranges of the NZW does transmitting ability (TA) were 0.814, 0.278 and 0.168 bunny for LSB; LS21 and LSW traits, resp. The percentages of positive breeding values estimate were 48.7, 48.7 and 56.4% for LSB; LS21 and LSW traits, rasp. Comparable significant moderate Pearson and Spearman correlation were obtained among BLUP's values& Ranks of the studied traits and they could both especially in cases with complexity of computations. Epigenetic Trend (EPG) with parities, the highest for Litter Size traits response was to the first parity. LS showed that epigenetic trend with Year-season (Y-S) effects gave better positive trends during good environmental circumstances and genetic expression could possibly change one environmental circumstance to another. Conclusively, this study recommends providing the acclimated New Zealand rabbits in Egypt more consideration and genetic improvement through selection to reach the performance of the standard breed due to the significant amounts of the trait's non-additional genetic component.

INTRODUCTION:The introduction of computer guided surgery in implant dentistry has marked a new era allowing various procedures to be performed with a great level of precision and accuracy. Recently, a novel design of the lateral window osteotomy, the "Low Window" sinus lift technique, was proposed to facilitate sinus augmentation and reduce postsurgical patient discomfort. AIM OF THE STUDY:The aim of this study was to evaluate the safety and effectiveness of the "Low Window" lateral sinus lifting technique. MATERIALS AND METHODS:The study group included 12 patients that were treated using the low window lateral sinus lift technique with simultaneous implant placement. This was facilitated using a Three dimensional (3D) printed surgical guide. Assessment on postoperative pain, edema, implant stability, vertical bone height gain, and complications such as Schneiderian membrane perforation. RESULTS: All patients experienced mild pain postoperatively with a significant decrease in pain from the 1st to 3rd day. Sinus membrane perforation occurred in 2 patients as well as mild postoperative bleeding on the first day. A statistically significant increase in vertical bone height (p<0.001) was observed as well as in implant stability, while marginal bone loss was within normal limits. CONCLUSION: The use of computer guided low window lateral sinus lift technique resulted in a satisfactory outcome in terms of postoperative pain, edema, bleeding, sinus perforation rates, implant stability, vertical bone height gained and marginal bone loss.

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INTRODUCTION: Rehabilitation of the maxilla using implants is frequently problematic because of the pneumatization of the maxillary sinus into the alveolar ridge. When only a few millimeters of augmentation are needed in conjunction with simultaneous implant placement, an indirect sinus lift is effective. This study describes transcrestal sinus lift using the sinus balloon technique and DASK (Dentium Advanced Sinus Kit) drills for implant placement in patients with an atrophic maxillary posterior area with synthetic bone graft, to evaluate the bone height achieved and the implant success rate. OBJECTIVES: To evaluate clinically and radiographically the simultaneous implant placement and grafting with synthetic bone graft after Schneiderian membrane elevation using the maxillary sinus balloon technique and DASK drills. MATERIALS AND METHODS A total of 13 patients with missing posterior maxillary teeth (premolars or molars) and with limited bone height below the floor of the maxillary sinus received an implant and grafting with synthetic bone graft after maxillary sinus lifting using a maxillary sinus balloon technique and DASK drills. RESULTS: Cone beam computerized tomography 6 months postoperatively showed statistically significant increase in bone height and density. The mean preoperative vertical bone height value was (5.97 ± 1.17 mm), while the mean 6 months postoperative vertical bone height value was (10.45 ± 1.56 mm). The mean preoperative implant bone density value was (349.6 ± 1265.9 HU), while the mean postoperative implant bone density was (771.1 ± 239.1 HU). CONCLUSIONS: Sinus balloon and DASK drills are an acceptable tool for indirect sinus lifting with simultaneous implant placement.