scholarly journals Comparison Between Two Different Design Concepts of 4- Implant Assisted Mandibular Complete Overdenture:- periimplant bone height changes

2021 ◽  
Vol 9 (11) ◽  
pp. 452-462
Author(s):  
Ekhlas Al-Shargaby ◽  
Radwa EMERA ◽  
Fatma Alwaseef ◽  
Mohammed Fouad
Keyword(s):  
Bone Loss ◽  
Alveolar Bone ◽  
Implant Design ◽  
Design Concepts ◽  
Short Implants ◽  
Group A ◽  
Edentulous Patients ◽  
Group B ◽  
Bone Height ◽  
Short Implant

Abstract: Purpose: This study was accomplished to evaluate the bone height changes radiographically and the reliability of use either two posterior short or inclined implants with two conventional anterior implants retaining mandibular overdenture.   Materials and methods: Ten male mandibular completely edentulous patients were divided in two equal groups after delivered complete dentures. For the first group (short implant design- group A) two vertical implants were inserted in the canine areas and two short vertical implants were inserted in the 1st molar area. For the second group (inclined implant design- group B) two vertical implants were inserted in the canine areas and two 30o distally inclined implants were inserted in the second premolar area. Digital standardized periapical radiographic assessment for horizontal and vertical alveolar bone height changes was carried out at T0 (immediately), T6 (6 months), T12 (12 months) and after mandibular complete overdenture insertion. Result: 1. VBL decrease significantly with advance of time in both groups during the time intervals. The highest VBL around the implants was noted in the 1st six months followed by the 2nd six months, the highest amount of total VBL observed with the interval T0-T12, followed by the interval (T0-T6) and the inclined implant group showed significant higher total VBL than short implant group at the intervals T0-T6 and T0-12. 2- HBL decreased significantly with advance of time in both groups. For short and inclined implant group, the highest amount of total HBL observed with the interval T0-T12, followed by the interval (T0-T6). Short implant group showed significant higher total HBL than inclined group at the interval T0-T6 and T0-T12.   Conclusion:  Within the limitations of this clinical radiographic study it can be concluded that (1) The 30o distally inclined implants inserted in the posterior areas for assisting mandibular complete overdenture induce vertical bone loss more than the axially inserted implants (short or conventional implants). (2) The short implants inserted in the posterior areas for assisting mandibular complete overdenture induce horizontal bone loss more than the axially inserted implants. Keywords: Short implants, O-ring ball attachment, VBL, HBL.  

scholarly journals Mandibular bone height changes in two different design concepts of four implant assisted overdenture

2021 ◽  
Vol 9 (05) ◽  
pp. 354-362
Author(s):  
Doaa Elmowafy ◽  
Mohamed M. Fouad ◽  
Nessreen Elmekkawy ◽  
Mohamed Elgamal
Keyword(s):  
Alveolar Bone ◽  
Design Concept ◽  
Surgical Guide ◽  
Design Concepts ◽  
Short Implants ◽  
Implant Overdenture ◽  
Group A ◽  
Male Patients ◽  
Group B ◽  
Bone Height

Purpose: This comparative study was conducted to compare between two different design concepts of four implant assisted complete mandibular overdenture regarding the residual alveolar bone height changes.Materials and Methods: Ten healthy completely edentulous male patients were selected for this study. For each patient, a conventional complete denture was constructed. Each mandibular denture was duplicated to be used as a radiographic stent, then the CBCT surgical guide template was printed according to each design concept of 4-implant overdenture. The CBCT surgical guide templates were used for installing the implants according to flapless surgical technique followed by delayed loading. According to the two design concepts of the 4-implant overdenture used in this study, the patients were randomly classified into two equal groups: group [A]had two vertical canine implants with two axial 1st molar short implants (short design concept), and group [B]had two vertical canine implants with two distally inclined premolar implants (inclined design concept). Radiographic evaluations were performed immediately (T0), 6 months (T6), and 12 months (T12) respectively after picking up of the ball attachments.

scholarly journals Evaluation of the Cortical Deformation Induced by Distal Cantilevers Supported by Extra-Short Implants: A Finite Elements Analysis Study

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 762 ◽  
Author(s):  
Enrique Fernández-Bodereau ◽  
Viviana Flores ◽  
Rafael Delgado-Ruiz ◽  
Juan Aragoneses ◽  
José Calvo-Guirado
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Model ◽  
Finite Elements Analysis ◽  
Fixed Partial Denture ◽  
Short Implants ◽  
Group A ◽  
The Difference ◽  
Group B ◽  
Bone Height ◽  
Single Implant

Background: The aim of the study was to analyze the distribution of stresses caused by an axial force in a three-dimensional model with the finite element method in the implant-supported fixed partial denture with distal overhang (PPFIVD) on short dental implants in the posterior edentulous maxilla. Methods: geometrical models of the maxilla with a bone remnant of 9 and 5 mm were created. Straumann SP® (Base, Switzerland) implants were placed in the premolar area. Two groups with subgroups were designed. Group A (GA): PPFIVD on two implants (GA1: 4.1 × 8 mm and GA2: 4.1 × 4 mm); Group B (GB): PPFIVD on the single implant (GB1: 4.1 × 8 mm and GB2: 4.1 × 4 mm). It was applied to a static force of 100 N to 30°. Results: PPFIVD on two implants reached the maximum tension in GA2 with respect to GA1; the difference was not significant in implants. In the maxilla GA2 was lower in relation to GA1; the difference was not significant. In PPFIVD over an implant, the stress was greater in GB2 with respect to GB1; the difference was significant in maxilla and implants. Peri-implant bone micro deformations and prosthesis-implant displacements were observed. Conclusions: PPFIVD over short splinted implants could be viable in the maxilla with reduced bone height, being an option when lifting the floor of the maxillary sinus. The rehabilitation with unitary implant (4 mm) did not provide adequate results. The dominant tensions evidenced bone micro-distortions with a displacement of the prosthesis-implant set. The real statement of this paper was to define that short splinted implants can be used in soft bone with high success rate in reducing bending forces.

scholarly journals Evaluation of Bone Mineral Density in Subjects with Primary Hyperparathyroidism by Dual Energy X-Ray Absorptiometry

2018 ◽  
Vol 20 (2) ◽  
pp. 129
Author(s):  
Rezwana Haque ◽  
Raihan Hussain ◽  
Shamim MF Begum
Keyword(s):  
Bone Loss ◽  
Femoral Neck ◽  
Primary Hyperparathyroidism ◽  
Dual Energy ◽  
Mineral Density ◽  
X Ray ◽  
T Score ◽  
Group A ◽  
Group B ◽  
Bone Condition

<p><strong><em>Objective:</em></strong><strong> </strong>Bone loss is a major complication of primary hyperparathyroidism (PHPT), and the extent of bone loss is an important factor for parathyroidectomy. Studies focused on this issue of bone loss in subjects with PHPT are quite rare in our country. This study will help the physicians to take proper action by giving an exact reflection of bone condition in subjects with PHPT. The purpose of this study was to evaluate the bone condition by measuring Bone Mineral Density (BMD), in subjects with PHPT using Dual Energy X-ray Absorptiometry (DEXA) and compare these findings with individuals without PHPT.</p><p><strong><em>Patients and Methods:</em></strong><strong> </strong>It was an analytic cross sectional study (group comparison) carried out at National Institute of Nuclear Medicine and Allied Sciences (NINMAS) BSMMU campus, Dhaka from July 2015-December 2016. Subjects of PHPT diagnosed by biochemical evaluation (increased serum calcium and parathyroid hormone concentrations), between age ranges 15-45 years were selected as group-A. Individuals without biochemical evidence of PHPT or other major illness causing bone loss were selected as comparison group or as group-B. The subjects underwent BMD test by DEXA at lumbar spines from L1-L4 vertebra and the left femoral neck using Norland XR-46 densitometer. BMD was classified according to WHO criteria. Data presented on categorical form were analyzed using chi-squared test. While the data presented on continuous scale were analyzed using student’s t-test. In each analysis, level of significance was 5% and P value &lt;0.05 was considered significant. Data were processed and analyzed with the help of computer software SPSS, version 20.</p><p><strong><em>Results:</em></strong><strong> </strong>Total number of 90 subjects were selected for this study, 45 subjects with PHPT were in group-A and equal number of subjects without PHPT were in group-B. The findings derived from data analysis showed, a significantly more male participants in group-A. The mean age of group-A and group-B was 37.24 ± 8.03 years and 38.20 ± 5.74 years respectively. Mean BMI of group-A was 25.10 ± 4.35 kg/m<sup>2  </sup>in compare to 29.43 ± 5.17 kg/m<sup>2</sup> in group-B. Higher BMI was noted in both groups. PHPT subjects with high BMI had low BMD. BMD expressed in absolute value (gm/cm<sup>2</sup>) and T score. BMD was significantly low in group-A (with PHPT) than in group-B (without PHPT), (p&lt;0.0001). In group-A, prevalence of low BMD was 62.2% (osteopenia 37.8%  and osteoporosis 24.4%)  at lumbar spine and 84.5% (osteopenia 35.6% and osteoporosis 48.9%) at femoral neck. PHPT subjects had significant difference in both T score and BMD between lumbar spine and femoral neck.</p><p><strong><em>Conclusion:</em></strong><strong> </strong>Primary hyperparathyroidism (PHPT) is shown to be associated with significantly reduced BMD especially at femoral neck. Thus, an increased fracture risk should consider if it is left untreated.</p><p>Bangladesh J. Nuclear Med. 20(2): 129-135, July 2017</p>

scholarly journals Does Implant-Abutment Interface affect Marginal Bone Levels around Implants?

2019 ◽  
Vol 13 (01) ◽  
pp. 047-052 ◽  
Author(s):  
Eser Elemek ◽  
Artun Urgancioglu ◽  
Janberd Dincer ◽  
Altug Cilingir
Keyword(s):  
Bone Loss ◽  
Dental Implants ◽  
Marginal Bone Loss ◽  
Single Crown ◽  
Implant Abutment ◽  
Different Types ◽  
Group A ◽  
Group B ◽  
Switch Group

Abstract Objective The use of dental implants with different types of surface roughness and implant-abutment interface has brought about a situation of marginal bone loss. Therefore, the aim of this study was to analyze and compare marginal bone levels of different types of osseointegrated dental implants with platform switch (Group A: Ankylos, Mannheim, Germany) and platform match (Group B: Dentsply Xive, Mannheim, Germany, and Group C: MIS Implant Technologies, Karmiel, Israel). Materials and Methods One hundred and seven patients (52 men and 55 women) with a mean age of 54.79 (standard deviation ± 12.35) years and a total of 321 dental implants (Group A, n = 198; Group B, n = 58; and Group C, n = 65) placed in a private practice between April 2006 and May 2015 were retrospectively analyzed. In addition to demographic information and implant characteristics, marginal bone levels were evaluated by Image J (Wayne Rasband, National Institute of Health, Maryland) program. Results The mean age of all patients was 54.79 ± 12.35 years, and 51.5% of them were women. Implants supporting fixed bridge were most commonly used in all groups (65%), whereas only 20% were restored with a single crown and 15% with overdentures. In total, 47.5% of all implants showed no marginal bone loss. Mean bone loss in Group A was significantly lower (0.81 ± 1.60 mm) as compared to Group B (1.58 ± 1.59 mm) and Group C (1.18 ± 1.36) (p < 0.005). Conclusion Among different types of dental implants, platform switch seems to preserve marginal bone levels and increase the long-term success of dental implants.

Potential Application of Low-Dose Doxycycline to Treat Periodontitis in Post-Menopausal Women

1998 ◽  
Vol 12 (1) ◽  
pp. 166-169 ◽  
Author(s):  
J.B. Payne ◽  
R.A. Reinhardt
Keyword(s):  
Bone Loss ◽  
Tooth Loss ◽  
Low Dose ◽  
Alveolar Bone ◽  
Public Health Problem ◽  
The United States ◽  
Alveolar Bone Loss ◽  
Design Concepts ◽  
Significant Public Health ◽  
Post Menopausal

The purpose of this paper is two-fold: (1) to review the evidence that osteoporosis and post-menopausal estrogen deficiency are associated with progressive alveolar bone loss and an elevated risk of tooth loss; and (2) to propose the use of tetracyclines, specifically low-dose doxycycline (LDD) (and, perhaps in the future, the chemically modified tetracyclines), to mitigate alveolar bone loss in post-menopausal osteoporotic/osteopenic women. Design concepts for a randomized clinical trial to study the effects of LDD on progressive alveolar bone loss in this patient population are reviewed. Since osteoporosis affects over 20 million people in the United States, progressive alveolar bone loss in this patient group represents a potentially significant public health problem unique from common adult periodontitis. Stopping progressive alveolar bone loss is essential to prevent both tooth loss and micro-architectural deterioration of alveolar bone.

Continuous Periosteal Strapping Sutures for Stabilization of Osseous Grafts With Resorbable Membranes for Buccal Ridge Augmentation: A Technique Report

2017 ◽  
Vol 43 (4) ◽  
pp. 283-290 ◽  
Author(s):  
Tamir H Shalev ◽  
Gregori M Kurtzman ◽  
Alon H Shalev ◽  
Deborah K Johnson ◽  
Mark Elias M Kersten
Keyword(s):  
Bone Loss ◽  
Tooth Loss ◽  
Alveolar Bone ◽  
Effective Means ◽  
Alveolar Bone Loss ◽  
Socket Preservation ◽  
Ridge Structure ◽  
Ridge Augmentation ◽  
Novel Technique ◽  
Bone Height

Alveolar bone loss occurs after extraction with loss of a premolar or anterior tooth; the residual supporting alveolar bone loss averages 1.53 mm of crestal bone height and 3.87 mm of buccolingual width, with most of the bone loss occurring at the facial plate. Socket preservation does not completely preserve the original ridge contours but can be an effective means of reducing bone loss following extraction. Attempts to rebuild the alveolar ridge structure after tooth loss often employ the concept of guided bone regeneration, a technique-sensitive procedure that routinely involves placement of particulate bone with or without fixation screws and either a resorbable or a nonresorbable membrane. We present a novel technique for stabilizing a resorbable membrane and underlying particulate graft allowing for predictable bone grafting across multiple edentulous sites.

scholarly journals Combining 10% propolis with carbonated hydroxyapatite to observe the RANKL expression in a rabbit’s alveolar bone

2020 ◽  
Vol 53 (4) ◽  
pp. 212
Author(s):  
Nungky Devitaningtyas ◽  
Ahmad Syaify ◽  
Dahlia Herawati
Keyword(s):  
Bone Regeneration ◽  
Alveolar Bone ◽  
Rankl Expression ◽  
Carbonated Hydroxyapatite ◽  
Treatment Groups ◽  
Group A ◽  
Group B ◽  
Post Hoc ◽  
Regenerative Periodontal Treatment ◽  
Open Flap Debridement

Background: Periodontitis causes an increased receptor activator level in the nuclear factor-κβ ligand (RANKL), which is one of the inflammatory mediators that plays a role in osteoclastogenesis. The open flap debridement (OFD) technique is the preferred treatment when accompanied by regenerative periodontal treatment using guided tissue regeneration (GTR) and guided bone regeneration (GBR). Carbonated hydroxyapatite is a GBR material that serves as a scaffold and has strong osteoconductive properties for bone regeneration. Propolis is natural product that can decrease osteoclastogenesis in periodontitis by decreasing the RANKL expression. Purpose: To investigate the RANKL expression after open flap debridement by applying carbonated hydroxyapatite to 10% propolis in the alveolar bone of rabbits. Methods: Nine induced-periodontitis rabbits (Oryctolagus cuniculus) were divided into three treatment groups of Group A OFD, Group B OFD followed by the application of carbonated hydroxyapatite, and Group C OFD followed by application of 10% propolis-carbonated hydroxyapatite. Each group was selected one to euthanised on the seventh, 14th and 28th day, respectively, and prepared using histology slides. The data was analysed using a two-way ANOVA followed by a post-hoc LSD test (p<0.05). Results: The RANKL expression in each group showed significant differences (p=0.00; p<0.05) on the seventh, 14th and 28th day. The post-hoc LSD test showed that the RANKL expression in the treatment group with carbonated hydroxyapatite-10% propolis had significant differences (p<0.05) in the intergroup analysis at different time points. Conclusion: Combining 10% propolis with carbonated hydroxyapatite in OFD treatment can decrease the RANKL expression in a rabbit’s alveolar bone.

scholarly journals The expression levels of MicroRNA-146a, RANKL and OPG after non-surgical periodontal treatment

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mandana Sattari ◽  
Ramezan Ali Taheri ◽  
Reza ArefNezhad ◽  
Hossein Motedayyen
Keyword(s):  
Healthy Subjects ◽  
Soft Tissues ◽  
Alveolar Bone ◽  
Periodontal Treatment ◽  
Control Group ◽  
Mrna Levels ◽  
Clinical Attachment Loss ◽  
Periodontal Tissues ◽  
Group A ◽  
Group B

Abstract Objective MicroRNA-146a (miR-146a) is a regulator of inflammatory response. Periodontitis is a disease with immune pathophysiology of the periodontium in which the inflammation results in the destruction of the soft tissues and alveolar bone. Therefore, the aim of this study was to investigate the expressions of miR-146a, OPG, and RANKL in diseased and healthy periodontal tissues to understand whether miR-146a expression level may associate with OPG and RANKL mRNA levels and OPG/RANKL ratio after non-surgical periodontal treatment. Methods The levels of miR-146a, RANKL, and OPG in gingival tissues from patients with generalized periodontitis stages II and III and grades A and B (n = 15, group A), patients with generalized periodontitis stages III and IV and grade C (n = 15, group B), and healthy individuals (n = 10) were determined by real-time PCR. The associations of miR-146a expression with OPG and RANKL levels were evaluated. Results The levels of miR-146a in two subgroups within periodontitis patients were significantly higher than healthy subjects (P < 0.0001). MiR-146a showed the increased level in group A of patients compared with group B (P < 0.05). Clinical parameters such as probing depth (PD) and clinical attachment loss (CAL) were significantly higher in patients than control group (P < 0.05). The levels of OPG and RANKL were increased in patients compared with healthy subjects, although the elevated levels were not statistically significant. MiR-146a was not associated with OPG and RANKL levels and OPG/RANKL ratio. Conclusions The results of this study failed to show the associations of miR-146a level with OPG and RANKL levels and OPG/RANKL ratio in periodontitis after non-surgical periodontal treatment.

scholarly journals Peri-Implant Bone Loss at Implants Placed in Preserved Alveolar Bone Versus Implants Placed in Native Bone: A Retrospective Radiographic Study

2018 ◽  
Vol 12 (1) ◽  
pp. 529-545 ◽  
Author(s):  
Johann Bui Quoc ◽  
Aurélie Vang ◽  
Laurence Evrard
Keyword(s):  
Clinical Study ◽  
Bone Loss ◽  
Alveolar Bone ◽  
Control Group ◽  
Radiographic Study ◽  
Platelet Concentrates ◽  
Native Bone ◽  
Retrospective Clinical Study ◽  
Significant Difference ◽  
Edentulous Patients

Objectives: The aim of our study was to compare peri-implant bone loss at implants placed in alveolar sockets filled with a particulate allogenous bone graft (DFDBA 300-500 µm) and platelet concentrates versus at implants placed in the native bone. Materials and Methods: A retrospective clinical study was performed. A total of 84 patients were included with 247 implants for the restoration of mono and pluri-radicular teeth: 169 implants in native bone and 78 in socket-grafted bone. The peri-implant bone loss was measured by 2 independent operators at 6 and 12 months. Results: The overall mesial and distal peri-implant bone losses were 0.9 ± 0.7 mm and 0.9 ± 0.8 mm at 6 months, respectively, and 1 ± 0.65 mm and 1.2 ± 0.9 mm at 12 months, respectively. In the tested group, the bone loss was 0.8 ± 0.8 mm at 6 months and 1.2 ± 0.9 mm at 12 months. In the control group, the bone loss was 1.0 ± 0.7 mm at 6 months and 0.95 ± 0.6 mm at 12 months. There were no statistically significant differences in bone loss between the two groups. Taking both groups together, there were no statistically significant difference in bone loss between patients with or without histories of periodontitis, but there was a statistically significant difference in bone loss between the mandible and maxilla as well as between unitary and total edentations and between partially and total edentulous patients. Conclusion: At 6 and 12 months, the peri-implant bone loss in sockets preserved with DFDBA and platelet concentrates was similar to the peri-implant bone loss in native bone.

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