This study aimed to evaluate the stability of two implant groups treated either only with sandblasting and acid etching or photoactivation after sandblasting and acid etching, using resonance frequency analysis (RFA). Materials and Methods:We investigated 50 implants in 25 patients (12 men and 13 women). Twenty-five implants were treated with sandblasting and acid etching, and 25 with photoactivation. We recorded the implant stability quotient (ISQ) value on the day of implant placement and consecutively every 2 weeks for 16 weeks for each implant. RFA was used for the direct measurement of implant stability. We compared mean ISQ values using a repeated-measures analysis of variance test. Results:The mean ISQ values at surgery and 16 weeks in implants treated only with sandblasting and acid etching were 77.8 ± 6.7 and 83.2 ± 2.5, respectively, while in those treated with f urther photoactivation were 78.9 ± 5.3 and 84. 1 ± 3.3, respectively. The photoactivated implants showed higher ISQ values than those without photoactivated surface treatment. However, there were no significant differences between the two implant groups. Conclusion:Both implant groups showed high implant stability in clinical practice. The photoactivated implant surface appears to have higher implant stability than that without photoactivation by increasing the hydrophilic surface.

The purpose of this case report is to introduce a flapless method of securely placing a narrow implant on the upper and lower anterior teeth missing area with narrow bone width using a digitally guided surgery system and to introduce a process of prosthesis manufacturing using an oral scanner without a working model. The narrow implants in this case report remained stable for a certain period of time (12, 24, and 36 months after surgery) without loss of the surrounding bones.

The aim of this study was to evaluate the survival rates of narrow implants placed in the maxillary or mandibular anterior region with digitally guided flapless surgery and prosthetic system. Thirty-five narrow implants were placed in the narrow anterior region in 20 patients using the digitally guided flapless surgery. The study subjects were divided into the immediate-loading group and the delayed-loading group. In 3 months, when the alveolar bone was healed, an oral scanner was used to produce zirconia prosthesis, and the final prosthesis was designed with a three-dimensional program. The degree of bone resorption around the implant was recorded at 12 months and 24 months after surgery. The implant fixation stability was measured after placement; the stability was in the range of Implant stability quotient (ISQ) 63-78 (average ISQ, 71.20±3.80). The radiographs obtained at 12 months and 24 months after implantation revealed that the bone around the implant in the fresh extraction socket and around the implant placed in the healed site showed an average bone resorption of 0.33±0.07 mm and 0.18±0.02 mm, respectively. After 2 weeks, one implant was removed because the patient complained of pain with radiolucency in the entire fixture. The overall implant survival rate was 97.1%. Narrow implants placed on the fresh extraction socket or healed site using the digitally guided surgery system were maintained well, with minor marginal bone resorption. As a result, we found that this method is useful for treating anterior teeth on a narrow bone.

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The purpose of this study was to investigate the impact of an implant with a blood pocket designed platform on the crestal bone by analyzing the stress distribution upon simulated application of occlusal forces and assessing its clinical role in marginal bone loss surrounding the implant. Stress exerted on the cortical and cancellous bones of three different platform type implants (URIS, TSIII, and Astra EV) were analyzed using finite element analysis (FEA). A load of 150 N was applied at 0°, 45°, and 90° angles to the long axis of each implant, and marginal bone loss in the implanted URIS fixtures (blood pocket designed platform) after immediate and delayed loading was measured. FEA showed that the stress generated on the fixture upon loading of the URIS implant was lower than that of the other two implants. The URIS implant also exerted the lowest stress on the cortical bone upon application of vertical pressure at an angle of 0° to the long axis of the fixture. The mean marginal bone loss in the alveolar bone was 1.01±0.33 mm and 0.46±0.30 mm upon immediate and delayed loading, respectively. FEA also indicated that implants with blood pocket designed platforms exhibited better stress distribution in the implant fixture and cortical bone under vertical pressure when compared to the fixtures of other designs. The marginal bone loss observed one year after loading of the URIS implant in the current study was lower than that reported previously.