Analysis of Effectiveness of Different Rotational Instruments in Implantoplasty: An In Vitro Study.

OBJECTIVE: To analyze the temperature increase in the implant, adjacent bone, procedure time, and roughness provided by different rotatory instruments in the implantoplasty procedure. MATERIAL AND METHODS: Three types of rotational instruments were used to evaluate the implant surface wear, divided according to their surface features: Group 1 (G1) diamond, Group 2 (G2) tungsten carbide, and Group 3 (G3) multilaminar. For the roughness test, a control group was included for comparison with the test groups. RESULTS: The temperature variation was statistically significant in the implant (P < 0.05) where G2 showed the lowest variation. There was no statistically significant difference between the 3 groups regarding the temperature increase measured in the bone (P > 0.05). The difference of wear time was statistically significant (P < 0.05) with faster results for G3. In the surface roughness analyses, there was a statistically significant difference (P < 0.05) between the control group and the test groups. Among the 3 test groups, the difference between measurements was not statistically significant (P > 0.05). CONCLUSION: All tested rotatory instruments performed the same level of surface roughness in the implantoplasty. The tungsten carbide bur caused a minor change in the implant temperature. The multilaminar bur performed a faster wear time. More in vivo studies are necessary to conclude which is the best rotatory instrument for implantoplasty.

Impact of local and systemic factors on additional peri-implant bone loss.

OBJECTIVE: To assess the impact of local and systemic factors on additional peri-implant bone loss. METHOD AND MATERIALS: From a total of 253 patients, 193 were selected (126 women) and restored with 722 implants, in place for at least 1 year. Patients had previously attended the supportive periodontal/peri-implant therapy program at the Department of Implant Dentistry at the Federal University of Santa Catarina, Brazil. The study was divided according to physiologic (PBL < 2 mm) or additional bone loss (ABL >= 2 mm) evaluated from the time of prosthesis placement to the reassessment visit. Data collection and analysis included evaluation of systemic factors, such as history of periodontal disease, heart disease, hypertension, diabetes mellitus, hyperthyroidism/hypothyroidism, osteoporosis, kidney disease, alcohol abuse, smoking habits, chemotherapy, radiation therapy, menopause, and hormone replacement. Analysis of local factors included implant platform, diameter, location, time in function, and type of prosthesis. RESULTS: No systemic factors influenced ABL (P > .05). Considering local factors, only time in function and type of prosthesis influenced ABL (P < .05). CONCLUSION: Fixed partial dental prostheses and full-arch fixed prostheses present higher rates of ABL. In addition, all types of prostheses showed greater ABL when in function for more than 4 years.