INTRODUCTION: Numerous publications have verified that tooth extraction is followed by dimensional changes of the alveolar ridge contour. The resorption of the alveolar ridge is more pronounced on the buccal than on the lingual aspect of the extraction socket. In particular, in the aesthetic zone, the successive soft and hard tissue deficiencies can interfere with optimal implant positioning and hamper the overall aesthetic outcome of implant-supported prostheses. OBJECTIVES: This study was designed to evaluate the socket shield technique clinically and radiographically as a new modality for immediate implantation in comparison to the conventional technique. MATERIALS AND METHODS: twenty patients were included in this study (n=20). They were divided in two groups; group I: Ten maxillary single rooted teeth were extracted followed by immediate implant placement using the socket shield technique. Group II: Ten maxillary single rooted teeth were extracted followed by immediate implant placement using the conventional technique. All implants were evaluated clinically and radiographically to evaluate bone loss on intervals of 1, 4 and 7 months. RESULTS: the mean horizontal and vertical bone loss value in socket shield technique group was 0.09±0.03mm & 0.43±0.23mm contrary to the conventional implantation after 7 months follow up, which was 0.33±0.14mm & 1.56±0.77mm which was statistically significant. CONCLUSIONS: The socket shield technique was beneficial in preserving the buccal bone plate

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Introduction:Long-term studies have documented the successful treatment of edentulous and partially edentulous patients with endosseous titanium implants. Success rates between 81% and 93% have been reported. Successful treatment with endosseous implants is dependent upon a complex relationship of numerous factors. Bone density and implant stability are important factors for implant osseointegration which has been widely demonstrated by several authors. Objectives: This study was designed to evaluate the correlation between bone density estimated by Cone-Beam Computed Tomography (CBCT) and stability of dental implants estimated by resonance frequency analysis using Osstell ISQ. Materials and methods: Ten dentis s-clean tapered implants were inserted in posterior mandibular edentulous spaces in ten adult patients. The bone density of implants recipient sites were determined by density value (HU) using CBCT. And the implants' stability were determined by quantitative unit called implant stability quotient (ISQ) measured by resonance frequency analysis using Osstell ISQ. Both values were determined immediately post-operatively and on intervals of 3&6 months. Results: The mean implant stability value was 67.3 ± 9.14 immediately post-operatively, then increased on the 3rd month to be 72.3 ± 3.95 & 75.2 ± 5.33 on the 6th month, there was a statistical significant increase. Also the results of the present study showed that the mean bone density value was 827.96 ± 206.85 immediately post-operatively, then increased to 890.67 ± 138 & 1018.0 ± 149.79 on the 3 rd and 6 th months respectively, there was a statistical significant increase. Conclusion: There was no correlation between bone density and implant stability.

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INTRODUCTION: Comminuted fractures of the mandible are an important traumatism, in which the mandibular bone is splintered or crushed. Treatment of these types of fractures had always been a challenge to surgeons, considering both the severity of the trauma and the presence of discontinuity defects which require replacement and augmentation in order to treat the bone loss. Titanium mesh was proved to be particularly useful for reconstruction of mandibular discontinuity defects also it can be used as a scaffold for bone grafts. Electrophoretic deposition (EPD) is a coating technique used to increase the osseointegration and increases bone regeneration. OBJECTIVES: To histologically evaluate the effect of titanium mesh coated with hydroxyapatite nanocrystals using electrophoretic deposition on bone osseointegration and healing following comminuted mandibular fractures. MATERIALS AND METHODS: A controlled induced comminuted fracture on the inferior border of the mandible extending from the 2 nd premolar to the 2 nd molar was performed on 12 mongrel dogs. Six dogs were treated using titanium mesh coated with hydroxyapatite nanocrystals (study group) and the other six using uncoated titanium mesh (control group). The dogs were sacrificed at 2, 4 and 6 weeks and the specimens were dissected to be histologically and radiographically evaluated for new bone formation. RESULTS: The histological outcome showed superior bone healing in the bony defects in the resembling comminuted fracture in the study group than the control group. CONCLUSIONS: The nano-hydroxyapatite coated titanium mesh is a suitable method for reconstruction of comminuted fractures with bony defects.

INTRODUCTION:Biphasic calcium phosphate (BCP) is very widely used as a grafting material around dental implants. The properties of such material can be enhanced by adding interpositional graft materials to enhance osteoinduction. Hyaluronic acid (HyA) is an example of osteopromoting materials that can be added to the BCP to enhance its osteoinductive properties. OBJECTIVES: Histological evaluation of using HyA with BCP on bone healing around dental implants. MATERIALS AND METHODS:This study was a split mouth design. It was conducted on 9 mongrel dogs. The dogs were allocated into two groups: Group A (Study Group): The right side of the mandible received dental implants with biphasic calcium phosphate bone graft mixed with hyaluronic acid following extraction of the mandibular third premolar. Group B (Control Group): The left side of the mandible received dental implants with biphasic calcium phosphate bone graft only following extraction of the mandibular third premolar. Dogs were sacrificed at 2, 4 and 6 weeks postoperatively. Segments containing the implant and bone graft were retrieved with adjacent bone to be prepared for histological examination using Haematoxylin and eosin stain and Trichrome stain. RESULTS: All animals survived well, and remained active and alert all over the course of the experiment. Both groups were characterized by new bone formation. The newly formed bone was more evident in association with group (A). CONCLUSIONS: HyA accelerates the onset of new bone formation when combined with BCP for bone augmentation in the treatment of osseous defects.

Introduction: conventionally dental implants were produced by machining titanium rods, then surface treatments or coatings are applied. The direct laser fabrication (DLF) is a new technology by which we can produce a dental implant with complex geometry that allows better osseointegration, through enhancing the differentiation of stem cells into osteoblasts and endotheliocytes leading to bone formation around the implant in a better and quicker way. Objectives: to compare osseointegration between laser sintered implants and acid etched implants. Materials and methods: This randomized clinical trial was conducted on twenty patients having edentulous spaces in the maxillary premolar area. They were divided equally into two groups, group A and group B, ten patients in each group. Laser sintered implants were placed in the edentulous spaces in group A patients, while conventional implants were placed in group B patients. Clinical and radiographic evaluations were carried out after 4, 6 and 9 months for both groups. Results: : Regarding the plaque index the scores of group A were found to be insignificantly lower than those of group B at 4 and 6 months and significantly lower at 9 months. The mean probing depth values in group A were significantly lower than group B at 4 and 6 months and insignificantly lower at 9 months. While, the implant mobility score was 0 for both groups. Regarding the mean marginal bone defect, values for group A were insignificantly lower than group B at 4 months, while significantly lower at 6 and 9 months. Conclusion: The use of both laser sintered and acid etched implants for replacement of maxillary premolars have significant success.