Digital subtraction radiography may be one of the most precise and noninvasive methods for assessing subtle density changes in peri-implant bone, providing additional diagnostic information on implant tissue integration in overall maintenance. The aims of this study were to evaluate density changes ...
Digital subtraction radiography may be one of the most precise and noninvasive methods for assessing subtle density changes in peri-implant bone, providing additional diagnostic information on implant tissue integration in overall maintenance. The aims of this study were to evaluate density changes after first, second surgery of dental implant and to measure the amount of marginal bone loss 9 months after second surgery using digital subtraction radiography. Bone change around 30 screw-shaped implants in 16 patients were assessed on radiographs. 17 Branemark implants of 3.75mm in diameter(Nobel Biocare, Goteborg, Sweden), 2 Branemark implants of 5.0mm in diameter, 11 $Replace^{TM}$ implants of 4.3mm in diameter(Nobel Biocare, Goteborg, Sweden) were used. To standardize the projection geometry of serial radiographs of implants, customized bite block was fabricated using XCP film holder(Rinn Corporation, Elgin, IL.) with polyether impression material of Impregum(ESPE, Germany) and direct digital image was obtained. Qualitative and quantitative changes on radiographs were measured with Emago software(The Oral Diagnostic System, Amsterdam, Netherlands). The results were as follows: 1. The peri-implant bone density of 69.2% implants did not change and the peri-implant bone density of 30.8% implants decreased after 3 months following first surgery. 2. The crestal bone density of 53.9% implants decreased first 3 months after second surgery. The crestal bone density of 58.8% implants increased 9 months after second surgery. No density change was observed around the midportion of the implants after second surgery, 3. The amount of marginal bone loss between different kinds of implants showed no statistically significant differences (p>0.05). 4. More than 90% of total marginal bone loss recorded in a 9-month period occurred during the first 3 months.
Digital subtraction radiography may be one of the most precise and noninvasive methods for assessing subtle density changes in peri-implant bone, providing additional diagnostic information on implant tissue integration in overall maintenance. The aims of this study were to evaluate density changes after first, second surgery of dental implant and to measure the amount of marginal bone loss 9 months after second surgery using digital subtraction radiography. Bone change around 30 screw-shaped implants in 16 patients were assessed on radiographs. 17 Branemark implants of 3.75mm in diameter(Nobel Biocare, Goteborg, Sweden), 2 Branemark implants of 5.0mm in diameter, 11 $Replace^{TM}$ implants of 4.3mm in diameter(Nobel Biocare, Goteborg, Sweden) were used. To standardize the projection geometry of serial radiographs of implants, customized bite block was fabricated using XCP film holder(Rinn Corporation, Elgin, IL.) with polyether impression material of Impregum(ESPE, Germany) and direct digital image was obtained. Qualitative and quantitative changes on radiographs were measured with Emago software(The Oral Diagnostic System, Amsterdam, Netherlands). The results were as follows: 1. The peri-implant bone density of 69.2% implants did not change and the peri-implant bone density of 30.8% implants decreased after 3 months following first surgery. 2. The crestal bone density of 53.9% implants decreased first 3 months after second surgery. The crestal bone density of 58.8% implants increased 9 months after second surgery. No density change was observed around the midportion of the implants after second surgery, 3. The amount of marginal bone loss between different kinds of implants showed no statistically significant differences (p>0.05). 4. More than 90% of total marginal bone loss recorded in a 9-month period occurred during the first 3 months.
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가설 설정
dental radiographs.13 The concept un derlying subtraction radiography is simple. An image processing computer subtracts all unchang ing structures from a set of 2 radiographs taken at 2 different examinations.
제안 방법
This study was divided into two tests. The aim of test 1 was to assess changes of bone density from first surgery to second surgery. Direct digitial X-ray images were obtained 0 month, 3 months, 6 months(two implants in Maxillae only)after first surgery, thirteen implants placed in seven patients were included in test 1 (Table I).
The aim of this study was to assess the change of bone density after first second surgery of dental im plant and the amount of marginal bone loss during 9-months after second surgery using digital sub traction radiography.
The aims of test 2 was to assess bone density changes and the amount of marginal bone loss from the time of second surgery to nine months af ter the surgery. Seventeen implants placed in nine patients were included in test 2(Table II).
Seventeen implants placed in nine patients were included in test 2(Table II). X-ray images were obtained 0 month, 3 months(the time of abutment connection), 9 months after the second surgery. The patients were restored with fixed par tial denture and instructed not to have tough or hard diets with the new prosthesis.
대상 데이터
radiographs. 17 Branemark implants of 3.75mm in diameter(Nobel Biocare, Goteborg, Sweden), 2 Branemark implants of 5.0mm in diameter, 11 Replace™ implants of 4:3mm in diameter(Nobel Biocare, Goteborg, Sweden) were used. Only partially edentulous patients of one to three missing teeth with adjacent natural tooth were selected to standardize the X-ray projection geometry.
The aim of test 1 was to assess changes of bone density from first surgery to second surgery. Direct digitial X-ray images were obtained 0 month, 3 months, 6 months(two implants in Maxillae only)after first surgery, thirteen implants placed in seven patients were included in test 1 (Table I).
the surgery. Seventeen implants placed in nine patients were included in test 2(Table II). X-ray images were obtained 0 month, 3 months(the time of abutment connection), 9 months after the second surgery.
데이터처리
Age was not found to be a statistically significant fac tor according to a correlation test. The amount of mar ginal bone loss during the 9-month period was statistically analyzed with the Kruskal-Wallis test us ing SPSS/PC+software(SPSSz Chicago, IL.). The amount of marginal bone loss after 3, 9 months had not statistically significant differences between three groups according to the Kruskal-Wallis test(P>0.
성능/효과
2. The crestal bone density of 58.8% implants in creased 9 months after second surgery. No den sity change was observed around the midportion of the implants after second surgery.
3. The amount of marginal bone loss between dif ferent kinds of implants had no statistically sig nificant differences (p>0.05).
4. More than 90% of total marginal bone loss record ed in a 9-month period occurred during the first 3 months.
The results were as follows: The peri-implant bone density of 69.2% implant did not change and the peri-implant bone density of 30.8% implants de creased 3 months after first surgery.
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