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1.
J Prosthet Dent ; 2020 Oct 30.
Artigo em Inglês | MEDLINE | ID: mdl-33139057

RESUMO

STATEMENT OF PROBLEM: Osseodensification, a counterclockwise drilling technique for the placement of endosseous implants is a popular clinical technique. However, the effect of the osseodensification technique on primary implant stability, bone-implant contact, and bone area frequency occupancy is unclear. PURPOSE: The purpose of this systematic review and meta-analysis was to investigate the biomechanical and histomorphometric outcomes of endosteal implants placed by using the osseodensification technique in animal models. MATERIAL AND METHODS: An electronic search through Medline/PubMed, Lilacs, and Science Direct databases, and an additional manual search of the reference list of included articles was conducted by using specific keywords and Medical Subject Headings (MeSH) terms for articles in the English language and published up to April 31, 2020. Only animal studies comparing the biomechanical and histomorphometric outcomes of endosteal implants placed by using the osseodensification and conventional drilling protocol were included. The SYstematic Review Center for Laboratory animal Experimentation (SYRCLE) tool was used to determine the risk of bias assessment, and the quality of included studies was assessed by using Animal Research: Reporting in Vivo Experiments (ARRIVE) guidelines. RESULTS: Nine studies were included. The results of the meta-analysis showed that the pooled weighted mean difference of the insertion torque value for the primary implant stability of endosseous dental implants placed by using the osseodensification technique was 2.270 (95% confidence interval [CI]=1.147 to 3.393; P<.001), the weighted mean difference of the percentage of bone-implant contact at 3 weeks was 0.487 (95% CI=0.220 to 0.754; P=.114), the weighted mean difference of the percentage of bone-implant contact at 6 weeks was 0.565 (95% CI=0.219 to 0.911; P=.448), the weighted mean difference of the percentage of bone area frequency occupancy at 3 weeks was 0.679 (95% CI=0.265 to 1.093; P=.073), and the weighted mean difference of the percentage of bone area frequency occupancy at 6 weeks was 0.391 (95% CI=-0.204 to 0.986; P=.027). CONCLUSIONS: Limited data from animal studies suggest that the primary implant stability, bone-implant contact, and bone area frequency occupancy significantly improved for the endosteal implants placed by using the osseodensification technique compared with conventional drilling protocol. However, additional laboratory and clinical studies are recommended to provide stronger evidence.

3.
J Prosthet Dent ; 2020 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-33039188

RESUMO

STATEMENT OF PROBLEM: The performance of the autogenous bone ring (ABR) technique used for the vertical bone augmentation procedure has not yet been determined. PURPOSE: The purpose of this systematic review was to investigate whether the ABR technique for the vertical bone augmentation procedure with simultaneous implant placement enhances the histologic and histomorphometric outcomes in surgically created bone defects in animal models. MATERIAL AND METHODS: An electronic search of 3 databases, Medline/PubMed, Science Direct, Lilacs, and a manual search of a reference list of relevant studies were performed. Only animal studies regarding vertical bone augmentation by using the ABR technique with simultaneous implant placement in surgically created bone defects were included in the review. The SYstematic Review Center for Laboratory Animal Experimentation tool was used to determine the risk of bias assessment, and the quality of included studies was assessed by using the Animal Research: Reporting in Vivo Experiments guidelines. RESULTS: Five studies were included in the qualitative analysis based on the inclusion and exclusion criteria. One study comparing the ABR technique with the bovine and biphasic ring reported a high percentage of bone area and bone implant contact of the ABR at 5 weeks of osseointegration. Similar histologic findings were reported in another study at 4 months of healing, but contrasting data were reported at 8 months. Another study reported an increase in the percentage of bone area and bone implant contact of the ABR technique from 3 months to 6 months of osseointegration. Two studies reported an increase in the percentage of bone area, and 1 study reported a decrease in the mean of bone implant contact, both with simultaneous and staged implant procedures. CONCLUSION: Based on the limited available studies, the use of the ABR technique for the vertical bone augmentation procedure with simultaneous implant placement presented optimal histologic and histomorphometric outcomes in surgically created bone defects in animal models. However, the results of the current review are not sufficiently robust to support the use of the ABR technique for vertical bone augmentation in humans.

7.
J Indian Prosthodont Soc ; 19(3): 233-239, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31462862

RESUMO

Aim: The aim of the study was to compare the assessment methods used to evaluate the fit of Ni-Cr metal copings. Settings and Design: Comparative- Invitro study design. Materials and Methods: A stainless steel die simulating a prepared first maxillary premolar was used as a master die. Wax pattern copings were fabricated by the conventional dipping wax technique (n = 20) on the master die and were cast in Ni-Cr alloy. The finished copings were fitted on the master die and scanned by the micro-computed tomography (CT) scanner. Multiple projections of the sample were reconstructed to evaluate the marginal and internal fit at 5 predetermined locations. The same copings were used for the replica technique and were evaluated under a stereomicroscope in the same locations. Statistical Analysis Used: Shapiro-Wilk's test and Unpaired t-test. Results: The marginal fit values observed were 127.71 and 95.06 µm, chamfer area fit values were 151.97 and 132.7 µm, axial area fit values were 62.36 and 46.14 µm, axio-occlusal area fit values were 139.52 and 123.6 µm, occlusal area fit values were slightly higher with 217.91 and 193.1 µm, respectively, in replica and micro-CT technique. There was no statistically significant difference observed in the fit between the two assessment methods (α > 0.05). Conclusions: There was no difference observed in the marginal and internal fit of Ni-Cr metal copings with the two methods of assessment. However, the micro-CT technique proved to be simpler, noninvasive, and time-saving assessment method.

8.
J Indian Prosthodont Soc ; 19(3): 255-260, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31462865

RESUMO

Aim: The aim of the study was to evaluate the shear bond strength of adhesive and self-adhesive resin luting agents (RLAs) to three commercially available composite core build-up materials (CBMs). Settings and Design: Comparative -invitro study. Materials and Methods: Sixty samples, 20 each of self-cure (Incore, Medicept: Group I), light cure (Light-Core, Bisco: Group II), and dual cure (LuxaCore Z-Dual, DMG America: Group III) composite CBMs were made in the lower mold space of a customized stainless steel jig. They were further subdivided into subgroups A and B for bonding with the adhesive (RelyX Ultimate, 3M ESPE) and self-adhesive (RelyX Unicem, 3M ESPE) RLAs respectively. For specimens in subgroup A, the bonding agent (Scotchbond Universal Adhesive, 3M ESPE) was rubbed onto the surface for 20 s prior to bonding with the adhesive RLA. For specimens in subgroup B, no pretreatment of the surface was carried out. The CBM-luting agent sample was tested for the shear bond strength in a universal testing machine. Statistical Analysis Used: ANOVA, Tukey's multiple comparison, and independent t-test. Results: Adhesive RLA showed the highest shear bond strength to light cured composite CBM. Self-adhesive RLA showed the highest shear bond strength to dual-cured composite CBM. Adhesive RLA showed higher shear bond strength to all three composite CBMs as compared to the self-adhesive luting agent. This difference was statistically significant for the self-cure and light cure composite CBMs. Conclusion: Adhesive RLA showed greater shear bond strengths to all the three groups of composite CBMs as compared to self-adhesive RLA.

9.
Natl J Maxillofac Surg ; 10(1): 105-108, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31205399

RESUMO

The hand is an integral part of our body. Any deviation in hand anatomy not only affects the day-to-day function but it even results in unesthetic appearance. Rehabilitation of these deformities is done either by microsurgery or with the help of silicone prosthesis. Nonsurgical treatment was carried out, where rehabilitation of the first digit was done with customized silicone prosthesis. Replacement of these deformities with silicone prosthesis is usually done by prosthetist. However, we being an oral and maxillofacial prosthodontist, replacement of these missing complete or partial fingers, thumb, ear, and nose is also done by prosthodontist. Rehabilitation of these deformities with silicone prosthesis can offer psychological, functional, and esthetic advantages. Recent advances in materials and skill of an individual made it possible to fabricate esthetically pleasing prosthesis. Mini implants are widely used for retaining silicone prosthesis; however, they are expensive and need surgical intervention. Vacuum-retained silicone-retained silicone prosthesis is a good and minimal invasive option for these patients. This clinical report describes a straightforward technique for fabricating silicone thumb prosthesis for a patient with amputated thumb.

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