scholarly journals Radiographic Assessment of Peri-implant Bone Level – A Comparative Study of Digital Intraoral and Digital Panoramic Radiography

2015 ◽  
Vol 62 (3) ◽  
pp. 117-121
Author(s):  
Ishita Gupta ◽  
Astha Chaudhry ◽  
Solanki Savita ◽  
Arvind Shetti
Keyword(s):  
Panoramic Radiography ◽  
Observer Agreement ◽  
Kappa Statistics ◽  
Agreement Rate ◽  
Panoramic Radiographs ◽  
Observer Reliability ◽  
Digital Panoramic Radiography ◽  
Bone Level ◽  
Marginal Bone Level

Abstract Introduction The objective of this study was to compare two radiographic methods - digital intraoral and digital panoramic radiography in assessing marginal bone level around dental implants. The study also evaluated inter-observer and intra-observer reliability during repeated assessments. Material and Methods Marginal bone around 29 implants in 17 patients was assessed using standardized digital intraoral and digital panoramic radiographs. Two observers evaluated bone level by noting the thread at which marginal bone seemed to be attached at distal and mesial surfaces of the implants. The assessments were repeated after one week. Kappa statistics was used to evaluate agreement between assessments, observers, and radiographical methods. Results The agreement rate between digital intraoral and digital panoramic radiography was fair. Intra-observer agreement was very good, while inter-observer agreement was moderate. Conclusion Digital panoramic radiographs can be used to evaluate marginal bone level in patients with multiple implants and also to supplement intraoral radiographs. However, observer variability should be considered when comparing values from follow up studies for implant maintenance.

scholarly journals Radiographic evaluation of a cross-shaped incision technique for thick-gingiva and thin-gingiva patients treated with implant-supported fixed prosthesis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Wen Luo ◽  
Xinyu Wang ◽  
Yaqian Chen ◽  
Yuping Hong ◽  
Yili Qu ◽  
...  
Keyword(s):  
Gingival Recession ◽  
Trial Registration ◽  
Radiographic Evaluation ◽  
Significant Difference ◽  
Registration Number ◽  
Bone Level ◽  
Fixed Prosthesis ◽  
Marginal Bone Level ◽  
Incision Technique

Abstract Background To evaluate a cross-shaped incision technique for thick-gingiva and thin-gingiva patients treated with implant-supported fixed prosthesis. Methods Total 55 patients receiving cross-shaped incision were assigned into thick-gingiva group (29 cases) and thin-gingiva group (26 cases). Follow-up was performed at 3 and 12-month after final restoration. Results Mesial and distal papilla height was significantly greater in thick-gingiva group than thin-gingiva group at 3 and 12 months, while periodontal depth and crestal marginal bone level around implant had no significant difference between the two groups during follow-up. No case of recession of buccal marginal gingiva was observed in thick-gingiva group. However, the recession of marginal gingiva of buccal aspect of the crown was found in 5 patients (19.2%) with thin-gingiva. Conclusions The cross-shaped incision may be applied to reconstruct gingival papillae and avoid the gingival recession in patients with thick-gingiva phenotype. Trial registration This study was registered at ClinicalTrials.gov (registration number NCT04706078, date 12 January 2021, Retrospectively registered).

scholarly journals Five Degree Internal Conical Connection and Marginal Bone Stability around Subcrestal Implants: A Retrospective Analysis

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3123
Author(s):  
Diego Lops ◽  
Michele Stocchero ◽  
Jason Motta Jones ◽  
Alessandro Freni ◽  
Antonino Palazzolo ◽  
...  
Keyword(s):  
Clinical Evidence ◽  
Multiple Regression Model ◽  
Vertical Position ◽  
Limited Information ◽  
Conical Connection ◽  
Bone Level ◽  
Platform Switching ◽  
Marginal Bone Level

Background: There is limited information on the effect of the connection between subcrestally placed implants and abutments on marginal bone levels. The aim of the present retrospective study was to evaluate marginal bone levels after definitive prosthesis delivery around implants with an internal 5° conical connection placed in a subcrestal position. Materials and methods: Patients treated with fixed prostheses supported by implants placed at a subcrestal level between 2012 and 2018 were recalled for a follow-up examination. All implants had 5° internal conical connection with platform switching. Radiographic marginal bone level (MBL) was measured. MBL change between prosthetic delivery (t0) and follow-up examination (t1) was calculated. A multiple regression model was performed to identify the most significant predictors on MBL change. Results: Ninety-three patients and 410 implants, with a mean follow-up of 2.72 ± 1.31 years, were examined. Mean MBL was −1.09 ± 0.65 mm and −1.00 ± 0.37 mm at t0 and t1, respectively, with a mean bone remodeling of 0.09 ± 0.68 mm. An implant’s vertical position in relation to the bone crest, the year of follow up and the presence of type-2 controlled diabetes were demonstrated to be influencing factors for MBL modifications. Conclusions: Subcrestally placed implants with platform switching and internal conical connection maintained stable bone levels over a mean follow-up of more than 2 years. How a tight internal conical connection between abutment and implant may contribute to this clinical evidence should be more deeply investigated. MBL variations seem to be mostly influenced by an implant’s vertical position and presence of type-2 controlled diabetes.

Marginal bone level changes and implant stability after loading are not influenced by baseline microstructural bone characteristics: 1-year follow-up

2015 ◽  
Vol 27 (10) ◽  
pp. 1212-1220 ◽  
Author(s):  
Danilo Rocha Dias ◽  
Cláudio Rodrigues Leles ◽  
Christina Lindh ◽  
Rejane Faria Ribeiro-Rotta
Keyword(s):  
Implant Stability ◽  
Bone Level ◽  
Marginal Bone Level

scholarly journals Clinical Evaluation of Dose Reduction on Image Quality of Panoramic Radiographs

2008 ◽  
Vol 9 (5) ◽  
pp. 34-41 ◽  
Author(s):  
Meryem Toraman Alkurt ◽  
Likay Peker ◽  
Gülten Usalan ◽  
Bülent Altunkaynak
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Clinical Evaluation ◽  
Panoramic Radiography ◽  
Panoramic Radiographs ◽  
Tube Current ◽  
Digital Panoramic Radiography ◽  
Significant Difference ◽  
Panoramic Images

Abstract Aim The purpose of this study was to evaluate the effect of tube current reduction on image quality using medium and regular intensifying screens as well as a digital system for panoramic radiography. Methods and Materials A total of 150 panoramic images of 75 patients were obtained in the study. The initial images were taken at standard exposure settings, and secondary images were exposed with the tube current reduced at different rates. Results There was no statistically significant difference (p>0.05) between the two exposures for Group 3 (the rate of dose reduction 25%) while a statistically significant difference (p<0.05) was found in Group 4 (the rate of dose reduction 50%) using medium intensifying screens for all observers. No statistically significant difference was found between the two exposures on digital panoramic images. Conclusion According to the results of this study a dose reduction of 25% was achieved for medium intensifying screens and for digital panoramic images without any loss of image quality. Clinical Significance A substantial reduction in radiation exposure can be achieved in conventional panoramic radiography using a medium intensifying screen and in digital panoramic radiography without any loss of image quality needed for radiological evaluation of anatomical structures and pathological conditions. Citation Alkurt MT, Peker I, Usalan G, Altunkaynak B. Clinical Evaluation of Dose Reduction on Image Quality of Panoramic Radiographs. J Contemp Dent Pract 2008 July; (9)5:034-041.

scholarly journals Effect of Opposite Tooth Condition on Marginal Bone Loss around Submerged Dental Implants: A Retrospective Study with a 3-Year Follow-Up

2021 ◽  
Vol 18 (20) ◽  
pp. 10715
Author(s):  
Odontuya Dorj ◽  
Hsi-Kuei Lin ◽  
Eisner Salamanca ◽  
Yu-Hwa Pan ◽  
Yi-Fan Wu ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Bone Loss ◽  
Dental Implants ◽  
Marginal Bone Loss ◽  
Bone Level ◽  
Natural Teeth ◽  
Marginal Bone Level

Background: The objective of this study was to evaluate the effects of opposite tooth conditions on change in marginal bone level (MBL) around submerged dental implants. Materials and methods: The study included healthy patients with one or two implants. Structures opposite implants were either natural teeth (NT) or fixed restorations (FRs). MBLs were measured on digital periapical radiographs at the mesial and distal aspects of each implant. Results: Sixty implants were inserted by the 3-year follow-up. Mean MBLs for NT were 0.21 ± 0.33 mm before prosthetic loading and 0.30 ± 0.41 mm 3 years later (p = 0.001). Mean MBLs with FRs were 0.36 ± 0.45 mm before loading and 0.53 ± 0.50 mm 3 years later (p < 0.001). Changes in mean MBL from the 6-month follow-up to the 1- and 3-year follow-ups were statistically significant (p < 0.01) for implants opposite NT. However, changes in mean MBL from the 6-month follow-up to the 1-year (p = 0.161) and 3-year follow-ups (p = 1.000) were not significant for implants opposite FRs. Between baseline and the 3-year follow-up, MBL change was relatively small and did not differ regarding NT and FRs. Conclusion: Bone loss was greater if submerged dental implants were opposed by FRs. MBLs around submerged implants continued to change after 3 years if NT opposed implants.

Magnetic resonance assessment of sinusoidal obstruction syndrome after neoadjuvant chemotherapy for colorectal liver metastases is not reproducible

2020 ◽  
pp. 028418512095798
Author(s):  
Femke CR Staal ◽  
Regina GH Beets-Tan ◽  
Birthe C Heeres ◽  
Janneke Houwers ◽  
Myrte de Boer ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Liver Metastases ◽  
Colorectal Liver Metastases ◽  
Observer Agreement ◽  
Sinusoidal Obstruction Syndrome ◽  
Kappa Statistics ◽  
Term Outcome ◽  
Long Term Outcome ◽  
Response To Chemotherapy

Background Sinusoidal obstruction syndrome (SOS) due to chemotherapy can cause severe hepatotoxicity, leading to impaired outcome in patients with colorectal cancer. A previous study introduced gadoxetic acid-enhanced magnetic resonance imaging (Gd-EOB-MRI) to diagnose SOS. Purpose To assess the reproducibility of Gd-EOB-MRI-based SOS diagnosis and its relationship with response to chemotherapy and long-term outcome. Material and Methods Twenty-six Gd-EOB-MRI scans of patients undergoing chemotherapy for colorectal liver metastases (CRLM) were retrospectively analyzed. Three radiologists, blinded to clinical data, independently scored presence and severity of SOS on a 5-point scale (0, definitely not present to 4, definitely present). Patients with a score ≥3 were considered SOS+. Inter-observer agreement between readers was assessed with kappa statistics. Response (RECIST 1.1.), occurrence of new CRLM during follow-up (hepatic progression) and overall survival (OS) were compared between patients with and without SOS. Results The inter-observer agreement of SOS scores was poor, with quadratic kappas of 0.17–0.40. For the binary outcome of SOS+ (confidence level [CL] 3–4) vs. SOS– (CL 0–2) agreement was poor, with kappas of 0.03–0.37. Median follow-up was 24 months (range 4–44 months). Response and OS between patients with and without SOS did not differ significantly for any of the readers. Conclusion Inter-observer agreement for the diagnosis of SOS on Gd-EOB-MRI is poor. No significant correlation with relevant outcomes was found for any of the readers. Therefore, MRI for SOS diagnosis might be less useful than previously reported. Other techniques should be explored to accurately diagnose SOS in absence of histological confirmation.

scholarly journals Comparison distortion in the mandible skull using panoramic digital radiograpy and Cone Beam Computed Tomography

2016 ◽  
Vol 28 (1) ◽  
Author(s):  
Cek Dara Manja
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Panoramic Radiography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Radiographic Imaging ◽  
Panoramic Radiographs ◽  
Minimal Distortion ◽  
Digital Panoramic Radiography ◽  
Actual Size

Panoramic radiography is widely used as a tool supporting the diagnosis in dental practice. Currently the technology has evolved with the presence of radiographic imaging such as Cone Beam Computed Tomography (CBCT) that displays a three-dimensional picture. The purpose of this study was to determine large distortions that occur several regio in the mandible using digital panoramic radiographs and CBCT. Method experimental The research on one of the skull laboratories fitted staples vertically and horizontally in alveolar regions 31, 33, 35, 37, 41, 43, 45, 47, and then measured the length of the staples using the term digital. Furthermore, digital panoramic radiography performed with position 00, +50, +100, -50, -100 and CBCT radiography with 00 positions. Measurement description of radiopaque vertical and horizontal lines on digital panoramic radiographs and CBCT are computerized using the EZ software measurement menu. Calculating percentage distortion radiopaque overview of vertical and horizontal lines on digital panoramic radiographs and CBCT of the mandible by doing a comparison of the actual size of the skull. The results obtained on the percentage of minimal distortion of digital panoramic radiographs vertically was in the 31 region positioned +50at 0,23%, in the 33 region positioned 00at 5,99%, in the 35 region positioned -100at -6,33%, in the 37 region positioned +100at -1,46%, in the 41 region positioned -50at 0,46%, in the 43 region positioned 00at 0,52%, in the 45 region positioned +100at -0,45%, in the 47 region positioned +100at -4,76%. The percentage of minimal distortion of digital panoramic radiographs horizontally all of region was positioned 00. The percentage of minimal distortion of  CBCT all of region was positioned 00 and different on each mandible alveolar region. The conclusion of this study is average distortion that occurs in the mandible using CBCT is more less than digital panoramic radiographs. That is mean CBCT more accurate than digital panoramic radiographs.

scholarly journals Marginal Bone Loss around Implants with Internal Hexagonal and Internal Conical Connections: A 12-Month Randomized Pilot Study

2021 ◽  
Vol 10 (22) ◽  
pp. 5427
Author(s):  
Pablo Galindo-Moreno ◽  
Ada Concha-Jeronimo ◽  
Lucia Lopez-Chaichio ◽  
Roque Rodriguez-Alvarez ◽  
Elena Sanchez-Fernandez ◽  
...  
Keyword(s):  
Bone Loss ◽  
Outcome Variable ◽  
Marginal Bone Loss ◽  
Keratinized Tissue ◽  
Radiographic Measurements ◽  
Bone Level ◽  
Main Outcome Variable ◽  
Marginal Bone Level ◽  
Implant Prosthesis

The aim of this study was to analyze the differences in terms of the marginal bone level (MBL) around implants with either an internal conical or an internal hexagonal implant–prosthesis connection. A randomized clinical trial included patients in need of a single implant-supported restoration. The implant–prosthesis connection was either internal conical or internal hexagonal while maintaining the same type of implant macro- and microarchitecture. Clinical and radiographical variables were registered up to 12 months of follow-up, including MBL. A total of 30 patients were included in the study. The main outcome variable, MBL 12 months after prosthesis delivery, was statistically different in both groups: −0.25 (0.12) vs. −0.70 (0.43) (conical vs. hexagonal; p = 0.033). Differences were also observed at the 3- and 6-month follow-up visits as well as for the MBL change from prosthesis delivery to the 12-month follow-up (−0.15 (0.13) vs. −0.56 (0.44); conical vs. hexagonal; p = 0.023). Correlations between MBL around the implants and radiographic measurements on the adjacent teeth, buccal bone to implant, tissue thickness or keratinized tissue were not significant neither globally nor when analyzed independently by group. In view of such results, it can be concluded that single-unit restorations with internal hexagonal-connection implants induce higher marginal bone loss after 12 months of follow-up from prosthesis delivery than internal conical-connection implants.

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