Changes In Alveolar Bone Height Research Articles

Radiographic evaluation of alveolar bone height changes around mandibular implants with different surface treatments supporting mandibular overdenture (A split mouth comparative study )

Radiographic evaluation of alveolar bone height changes around mandibular implants with different surface treatments supporting mandibular overdenture (A split mouth comparative study )

Alveolar bone height changes in the anterior tooth region before and after orthodontic treatment for Angle's Class II division 1 malocclusion and related factors.

The aim of this study was to observe the alveolar bone height changes in the anterior tooth region after orthodontic treatment for Angle's Class II division 1 malocclusion. Ninety-three patients treated from January 2015 to December 2019 were retrospectively analyzed, of whom 48 received tooth extraction and 45 did not. After orthodontic treatment, the alveolar bone heights in the anterior tooth regions of tooth extraction and non-extraction groups decreased by 67.31% and 66.94%, respectively. Except for the maxillary and mandibular canines in the tooth extraction group as well as the labial side of maxillary anterior teeth and the palatal side of maxillary central incisors of the non-extraction group, the alveolar bone heights of other sites significantly reduced (P<0.05). The reduction in the alveolar bone height of the tooth extraction group significantly exceeded that of the non-extraction group on the palatal side of maxillary incisors and the lingual side of mandibular anterior teeth (P<0.05). Alveolar bone height in the anterior tooth region decreases after orthodontic treatment for Angle's Class II division 1 malocclusion, being closely related to tooth position together with movement direction and amplitude.

Introduction of Accurate Measurement of the Alveolar Bone Height in Bone Grafting Area after Sinus Lift.

Sinus lift via the alveolar crest approach has been proven to solve inadequate alveolar bone height perfectly in the posterior region of the maxilla. Nevertheless, the surgical area cannot be directly observed, imaging methods are necessary to reveal whether the surgery has achieved the expected results. Cone-Beam Computed Tomography (CBCT) images are usually taken before surgery and at the completion of final pre-repair osseointegration and evaluate the effect of maxillary sinus lift by measuring the alveolar bone height in the bone graft area. However, there is no uniform and recognized method to accurately measure the alveolar bone height in the bone grafting area before and after maxillary sinus lift. Therefore, the authors propose a simple, accurate, and reproducible method for the measurement of alveolar bone height in maxillary sinus lift on CBCT, which will be an innovation. 30 implant cases (30 patients) were included in this study. The authors create a uniformed measurement surface in the CBCT axial interface to ensure consistency at the completion of final prerepair osseointegration and before surgery. Then changes in alveolar bone height in the bone grafting area before and after sinus lift were measured on CBCT coronal and arch planes. Finally, for the purpose of verification of repeatability, three dentists from our department were randomly selected to measure and record the above CBCT data at three different time points. The data showed that in the CBCT measurements of the three dentists, neither the coronal plane nor the arch plane was statistically significant. (P > 0.05). This measurement method is simple, accurate and repeatable. It can be applied to measure alveolar bone height in the bone grafting area before and after maxillary sinus lift.

Association between alveolar bone height changes in mandibular incisors and three-dimensional tooth movement in non-extraction orthodontic treatment with Invisalign.

The purpose of this study was to investigate associations between alveolar bone height changes on the labial and lingual sides in mandibular incisors and three-dimensional orthodontic tooth movement, involving apex displacement, tooth inclination, and angulation. The samples consisted of 43 adult patients treated with Invisalign aligners. All subjects were skeletal Class I patients without extraction in mandible. Pre-treatment and post-treatment cone-beam computed tomographic images were obtained to measure labial and lingual alveolar bone height and bone thickness at apex level in four mandibular incisors. An x, y, z coordinate system, superimposing on mandibular body, was established to analyse three-dimensional apex movement and tooth inclination and angulation changes. Multiple linear regression was applied to identify the determining factors of marginal bone changes during orthodontic treatment. Three directions of apex movement (anteroposterior, vertical, transverse) significantly associated with alveolar bone height changes. Inclination changes had a strong effect on lingual marginal bone, while tooth angulation had no significant effect on alveolar bone height. Incisors with lingual bodily movement were more susceptible to lingual marginal bone recession compared with lingual tipping movement. Alveolar bone height changes on the labial and lingual sides were associated with three-dimensional apex movement, inclination changes, and movement patterns. Appropriate tooth movement should be considered to avoid excessive marginal bone loss around mandibular incisors.

Comparison of Gonial Angle and Alveolar Bone Height Changes in Panoramic and Lateral Cephalometry Radiography in Growing Patients

Background: This study aimed to compare the gonial angle and alveolar bone height changes between panoramic and lateral cephalometry radiographic images in class II malocclusion patients before and after orthodontic treatment. Methods: The obtained radiographic images were selected from among 120 class 2 malocclusion cases. The gonial angle and alveolar bone height were measured in the midline and molar regions of panoramic and lateral cephalometric radiographs using the software tools before and after the treatment of patients. Study data were analyzed by SPSS statistical software (version 21.0), and a significance level was set to 0.05 for all statistical tests. Results: Based on the results, no significant difference was found regarding the gonial angle before and after treatment on the right and left sides in panoramic radiography and the gonial angle changes before and after treatment in cephalometric radiography (P&gt;0.05). However, the obtained results for posterior and anterior alveolar ridge height were significant in panoramic and cephalometric radiographs (P&lt;0.05). Moreover, the comparison of the measured gonial angle values before treatment in panoramic and cephalometric radiography represented a significant level (P&lt;0.05). Eventually, the statistical results suggested that the alveolar bone height differences between panoramic and cephalometry radiography were significantly different in both anterior and posterior regions after treatment (P&lt;0.05). Conclusions: The findings indicated that only measurements obtained from the panoramic radiography were valid for the gonial angle. However, panoramic and cephalometry radiography procedures cannot be replaced for assessing the anterior and posterior alveolar bone height.

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

Abstract:&#x0D; 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.&#x0D; &#x0D; 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.&#x0D; 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.&#x0D; 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.&#x0D; &#x0D; 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.&#x0D; Keywords: Short implants, O-ring ball attachment, VBL, HBL.&#x0D;

Cephalometric radiographic comparison of alveolar bone height changes between adolescent and adult patients treated with premolar extractions: A retrospective study

In orthodontic treatment, indication of dental extractions is very common and frequently used in adult patients. This situation is a recurrent concern among orthodontists, since age and extraction treatment are factors that may increase periodontal support loss. Therefore, this study aimed to evaluate adolescent and adult patients, orthodontically treated with maxillary premolar extractions, and compare both groups regarding the changes in alveolar bone height loss, retrospectively. Fifty-five patients were selected from the files of an Orthodontic Department and divided into 2 groups. The adolescent group comprised 30 patients with a mean age of 12.7 years (SD=1.4) and the adult group comprised 25 patients with a mean age of 25.0 years (SD=1.8). Periapical radiographs obtained at pre-treatment (T1) and posttreatment (T2) were evaluated. Wilcoxon tests were used to analyse intragroup treatment changes. Mann-Whitney tests were used to compare intergroup and inter-sex initial and final statuses and treatment changes. P<0.05 is considered to be statistically significant. Statistically significant increases in alveolar bone height loss of the maxillary central incisors were observed on the right and left sides of the adolescent (P=0.001 and P=0.002, respectively) and of the adult (P=0.001 and P<0.001, respectively) groups, during treatment. There were no significant differences in alveolar bone height between initial and final state, in treatment effects between adolescent and adult patients, in extraction patterns, and between males and females. Significant increase in alveolar bone height loss was found in both adult and adolescent patients orthodontically treated with maxillary premolar extractions. However, no significant differences were found regarding alveolar bone height changes after extraction orthodontic treatment between adolescent and adult patients.

Analysis of Posterior Zirconia Crowns with Vertical Margin Preparations.

The interest in vertical crown preparation is growing and several variations are presented in the dental literature but limited clinical outcome data exists for teeth prepared for a vertical finish line. To audit clinical outcomes for 73 teeth after vertical preparation for knife-edge zirconia crowns. Seventy-three teeth had knife-edge zirconia crowns placed after vertical finish line preparation. The outcomes for these teeth were analysed from a retrospective audit of clinical records. The mean follow-up time was 21 months (SD: 10 months; range: 6-40). One tooth had to be extracted due to fracture at cervical level. One crown had to be re-made after margin fracture during try-in. No subsequent endodontic treatment was needed for any of the prepared teeth. No change in alveolar bone height was noted on radiographic follow-up. The mean bleeding score for the crowned teeth was higher than the mean bleeding score for a control tooth, but this was not statistically significant. This retrospective evaluation has shown favourable outcomes for 72 teeth after vertical preparation for knife-edge crowns. Longer follow-up is needed but the present results show that the technique is a viable procedure with potential advantages.

Does Alt-RAMEC protocol and facemask treatment affect dentoalveolar structures?

To evaluate dentoalveolar changes immediately after the alternate rapid maxillary expansion and constriction (Alt-RAMEC) protocol and facemask (FM) treatment using cone-beam computed tomography images. Cone-beam computed tomography images of 20 patients (mean age = 9.64 ± 1.3 years) who received the Alt-RAMEC protocol before FM treatment were retrieved in this retrospective study. Dental and alveolar inclinations, buccal and palatal alveolar bone thickness, and buccal and palatal alveolar bone height changes were measured before treatment (T0), after the Alt-RAMEC protocol (T1), and after FM treatment (T2). Measurements for right and left molars were performed separately. The Shapiro-Wilks test was used to assess the conformity of the parameters to the normal distribution. The paired t-test and repeated measures analysis of variance were used for normally distributed data. The Wilcoxon signed-rank test and Friedman test were used for non-normally distributed data. The Bonferroni correction was used to reduce the chances of obtaining false-positive results. Statistical significance was set at P < .05. Buccal alveolar bone thickness and alveolar bone inclinations decreased significantly from T1 to T0 and showed no significant change from T2 to T1. The total reduction T2-T0 was statistically significant. The change in palatal alveolar bone thickness was not significant T1-T0 but increased significantly for T2-T1 and T2-T0. Buccal alveolar bone height, palatal alveolar bone height, and molar inclinations increased significantly T1-T0, but there was no significant change T2-T1. The total reduction at T2-T0 was statistically significant. The results of this study revealed that the effects of the Alt-RAMEC protocol on dentoalveolar tissues were similar to the changes reported in the literature after rapid palatal expansion.

Age Affects Alveolar Bone Height and Width in Patients Undergoing Dental Implant Treatment: Findings from Computed Tomography Imaging

Dental implants may help improve the general health and quality of life in older adults with tooth loss. Accurate assessment of the alveolar bone is key to implant treatment. Several studies have examined the value of jaw morphology diagnostic imaging; however, few studies have evaluated age-related changes in alveolar bone height and width using computed tomography (CT) scanning. The purpose of this study was to assess age-related changes in alveolar bone height and width using CT scans of patients undergoing dental implant treatment. We analyzed CT scans of 1960 sites in 655 cases (225 men, 430women; age rage, 20-85 years; mean age, 60.96 years) obtained from June 2016 to December 2018. The mean alveolar bone height and width were the outcomes of interest. The participants were dichotomized by age into groups of 20-64 and 65-85 years. Alveolar bone height and width were classified into six groups by site; the values were examined by age. Analyses were performed with the Mann-Whitney U test and Spearman correlation coefficients. Statistical significance was established at P<0.05. The height of the upper anterior (P<0.001), upper premolar (P<0.001), upper molar (P<0.01), lower anterior (P<0.01), lower premolar (P<0.05), and lower molar (P<0.01) sites, and the width of the upper anterior (P<0.01), upper premolar (P<0.01), and upper molar (P<0.01) sites in the alveolar bone were significantly associated with age. The present findings suggest that the decline in upper alveolar bone height and width and lower alveolar bone height is associated with aging in the present cohort. These findings suggest that older people may require implant treatment that is predicated on bone grafting.

Clinical Efficacy of Mixing Natural Teeth and Implant Supported Denture Sleeve

Objective: To analyze the clinical efficacy of Mixing natural teeth and implant supported denture sleeve, and provide reference for clinical treatment. Methods: 46 patients with Molarless in hospital from December 2010 - December 2014 were selected, patients were randomly divided into observer group and control group, two groups of patients were designed and planted natural teeth fixed bridge and natural teeth and implants mixed support sleeve denture, regular follow patients and the surrounding alveolar bone height changes, 5-year cumulative retention rate, clinical efficiency and other indicators. Results: During clinical observation, patients with no obvious symptoms, the use of feel good, no loose superstructure situation. Two groups of patients were 2 cases of patients with implant loosening occurs, the amount of bone resorption annual observation group (0.22 ± 0.10) mm less than the control group (0.24 ± 0.08) mm, but no significant difference (P&gt; 0.05), clinical observation group efficiency (100%) was significantly higher (72.3%) (P &lt;0.05), the observation group study implants 5-year cumulative retention rate was 94.4%. Conclusion: Mixing natural teeth and implant - supported telescopic denture success rate of 100% was observed during the clinical results were satisfactory, with use value.

A cone-beam computed tomographic evaluation of alveolar bone dimensional changes and the periodontal limits of mandibular incisor advancement in skeletal Class II patients.

To evaluate the presence of dehiscences and changes in alveolar bone height and width in the area of the mandibular central incisors pre- and post-orthodontic treatment. In 60 skeletal Class II patients, cone-beam computed tomographic (CBCT) images were obtained and the patients were divided into four groups based on the presence of dehiscences at pre- and post-orthodontic treatment. The alveolar bone height and width were measured on CBCT in cross section along the long axis of the teeth. Lateral cephalograms were analyzed. The changes in L1-NB and IMPA appeared to be correlated with vertical bone loss and dehiscence. Alveolar bone height appeared to follow a segmented relationship with these two variables, with changes below a threshold (L1-NB = 0.71 mm, IMPA = 3.02°) having relatively minimal or no effect on bone loss but with changes beyond the threshold correlated with extensive bone loss. Similarly, increases in L1-NB or IMPA correlated with decreases in alveolar bone width (L1-NB: -0.25 mm/mm, IMPA: -0.07 mm/°) and increased the probability of developing dehiscences, with an estimated 50% probability of vertical bone loss at a L1-NB change of 2.00 mm or, equivalently, an IMPA change of 8.02° was estimated. When treating skeletal Class II patients, the limits of incisor proclination/protraction are less than previously thought. To prevent undesired periodontal outcomes, careful three-dimensional diagnosis is advisable. Furthermore, when excessive protrusion and/or proclination is planned, additional treatment modalities, including orthognathic surgery, tooth extraction, and corticotomy with bone graft, should be considered.

INFUENCE OF TOOTH-IMPLANT SUPPORTED TELESCOPIC OVERDENTURES WITH CERVICAL CLEARANCE ON SUPPORTING STRUCTURES OF UNILATERAL DISTAL EXTENSION RIDGE

Aim: This study aimed to evaluate the influence of tooth -implant supported telescopic partial overdentures with cervical clearance on the supporting structures of unilateral distal extension removable partial dentures. Materials and methods: Twelve male partially edentulous patients exhibiting lower Kennedy class II (lost second premolar and molar teeth on one side) opposed by completely edentulous maxilla were selected. Single unilateral implant was placed in the edentulous first molar area of the distal extension ridge. Patients were rehabilitated by Maxillary complete dentures and mandibular tooth-implant retained telescopic partial overdentures. Patients were randomly divided by using closed envelope into two equal groups; according to the design of telescopic crown. Group I; patients received cervically relieved telescopic crowns, (cervical clearance), and Group II; patients received telescopic crowns with no relief between primary and secondary copings, (precise fit). Measuring probing depth, and radiographic changes in marginal bone height of the abutments, and crestal bone height of the residual ridge, were evaluated at 3, 6, 9 and 12 months after denture insertion.Results: Statistical analysis revealed a significant increase in the means of the measured abutments probing depth, change in alveolar bone height of the abutments, and crestal bone height of the residual ridge (mm) during the follow up time intervals in both group I (cervical clearance) and group II (precise fit). Abutments having telescopic crowns with precise fit showed significantly higher probing depth and change in alveolar bone height compared to those with cervical clearance. There was no statistically significant difference in the change in crestal bone height between the two studied groups at the end of the study period. Conclusions: Telescopic retainers with cervical clearance are recommended for unilateral partial dentures compared to those with precise fit as they have a lowest destructive effect on the change in probing depth and height of the marginal bone of the abutments. However, the change in the crestal bone height was not significantly affected by the design of the telescopic retainers.

Maxillary Sinus Floor and Alveolar Crest Alterations Following Extraction of Single Maxillary Molars: A Retrospective CBCT Analysis.

This retrospective study investigated the changes in the maxillary sinus floor and alveolar crest following extraction of maxillary molars. Pre- and postextraction cone beam computed tomography scans of 23 patients were analyzed. Paired-sample t tests compared pre- and postextraction measurements, and independent-sample t tests were utilized for intergroup comparisons. Pearson correlation was used to assess the association between the measured variables and the outcome measures. The mean alveolar bone height reduction was 3.42 ± 2.40 mm and the alveolar crest loss was 3.07 ± 2.53 mm. The maxillary sinus floor position shifted coronally by a mean of 0.47 ± 0.32 mm. Approximately 88% of postextraction changes in alveolar bone height were due to alveolar crest changes, compared to 12% due to changes in the sinus floor position. The results of this study challenge the commonly held concept of extensive postextraction maxillary sinus floor alterations leading to sinus pneumatization.

A randomized controlled clinical trial evaluating efficacy and adverse events of different types of recombinant human bone morphogenetic protein-2 delivery systems for alveolar ridge preservation.

This 12-week clinical trial evaluated efficacy and adverse events for two recombinant human bone morphogenetic protein-2 (rhBMP-2) delivery systems in alveolar ridge preservation. Sixty-four patients had a single tooth that required replacement with an implant, surrounded by>50% alveolar bone height. Two cohorts (n=32 patients each) were randomized to receive a rhBMP-2-soaked absorbable collagen sponge (test group), or β-tricalcium phosphate and hydroxyapatite particles (control group) immersed in rhBMP-2, at the implant site. Bone height and width changes at 25%, 50%, and 75% of extraction socket level (ESL) were compared. Adverse events were assessed in the same period. In addition to the randomized controlled clinical trial, histological analysis of 21 patients (test group [n=12], control group [n=9]) was conducted, 4months after alveolar ridge preservation. A non-inferiority test was used to analyze changes in alveolar bone height between groups (p=0.05). A Wilcoxon rank-sum test was used to analyze changes in alveolar bone width and histomorphometric results between groups (p=0.05). All patients showed good healing without severe adverse events. The lower limit of the one-sided 97.5% confidence interval in the difference between the two groups was 0.0033 (non-inferiority margin: -0.185); thus, the test group showed non-inferiority to the control group. Wilcoxon rank-sum test analysis did not show statistically significant differences between groups with regard to changes in alveolar bone width and histomorphometric analysis. The delivery systems showed similar efficacy for alveolar ridge preservation without severe adverse events.

Clinical evaluation of efficacy and safety of NOVOSIS‐inject containing bmp‐2 for socket preservation after extraction of a single‐rooted tooth

Background Several studies have reported that 2 3 of the changes in the cross-sectional area of the ridge are known to occur in the first 3 months after extraction. the loss of alveolar ridge causes problems in the aesthetic function of the subsequent implant placement as well as difficulty in securing the space. CGbio Co., Inc. has studied the alveolar socket preservation effect and safety of BMP-2 with injectable bone graft substitute (ExcelOs Inject) manufactured by mixing β -TCP and hydrogel. Aim/Hypothesis The purpose of this study was to compare the socket preservation effect and safety of Novosis-Inject (ExcelOs Inject with BMP-2) to ExcelOs Inject. Material and Methods Subjects in the clinical trial were patients aged 19 to 80 years who needed an extraction, except for the wisdom tooth. In the test group, a putty-type ExcelOs Inject (CGBio Co., Inc., Korea) with BMP-2 (Daewoong Pharmaceutical Inc., Korea) was implanted into the extraction socket and only the ExcelOs Inject was implanted in the control group. Computed tomography (CT) was performed after the procedure to establish the baseline. During the 12-weeks clinical trial period, the subjects was observed to check for any adverse events such as complications. After 12 weeks of extraction, a secondary end point CT scan was performed to evaluate the change of the extraction socket. The primary outcome measure is the change in the alveolar bone height and the secondary end point is 75, 50, 25% ESL (Extraction Socket Level) Results The primary outcome measure results in the FAS (Full Analysis Set) group showed a change in alveolar bone height (LS Mean) (-)0.50 mm in the test group (n = 41), (−)1.42 mm in the control group (n = 43) and 95% CI was 0.92. The secondary outcome measure showed a change in 75, 50 and 25% extraction socket length (LS Mean) (−) 0.63 mm, (−) 0.169 mm, (−) 0.93 mm in the test group, (−)0.70 mm, (−)1.69 mm, (−) 3.96 mm in the control group, respectively, and 95% CI was 0.46, 1.50, and 3.03 respectively. All 95% CI results were greater than 0, confirming that the test group was superior to the control group. In addition, there were no serious adverse event (AE) adverse device effect (ADE) after the clinical evaluation among the 84 patients in the safety analysis, and the difference in the incidence of adverse event between the groups was not statistically significant. Conclusions and Clinical Implications In this study, we investigated the effect of BMP-2 on the bone graft substitution of injectable ceramics (β -TCP) to improve osteoinduction and compared that in the test group (with BMP-2) and that in the control group (without BMP-2). It has been proven safe and clinically effective Novosis-Inject to use as a material for socket preservation to prevent the absorption of alveolar ridge augmentation and preserve shape after extraction.

Alveolar bone response to light-force tipping and bodily movement in maxillary incisor advancement: A prospective randomized clinical trial.

To compare alveolar bone thickness and height changes between untreated incisors (control), incisors advanced with light-force tipping, and incisors advanced with bodily movement mechanics. Forty-three subjects (aged 9.49 ± 1.56 years) with anterior crossbite were allocated into an untreated group (control), tipping group, or bodily movement group. Lateral cephalograms were taken before advancement (T0) and after obtaining normal overjet (T1). Changes in labial and palatal alveolar bone thickness and height surrounding maxillary incisors were evaluated with limited field-of-view cone-beam computed tomography before advancement (CT0) and 4 months after normal overjet was obtained (CT1). Wilcoxon matched-pairs signed-rank and Kruskal-Wallis one-way ANOVA tests were used to compare changes within and between groups, as appropriate. The significance level was set at .05. Labial alveolar bone thickness at the midroot and apical levels were significantly decreased in the bodily movement group ( P < .05). However, between groups, there was no statistically significant difference in labial bone thickness changes at any level. Palatal and total alveolar bone thickness at the midroot and apical levels were significantly decreased in the tipping group compared with the control and bodily movement groups ( P < .05). Neither labial nor palatal bone height changes were significantly different among groups. Maxillary incisor advancement with light-force tipping and bodily movement in growing patients resulted in labial alveolar bone thickness and labial and palatal alveolar bone height changes that were similar to the untreated group.

The effect of two different solitary attachments used to retain implant assisted mandibular distal extension Removable Partial Overdenture on abutment alveolar bone height changes

The main objective of this clinical comparison study was to compare between different designs of solitary attachments used to retain implant assisted mandibular distal extension RPD regarding alveolar bone height changes around abutment teeth. Methods: Twelve patients with mandibular Kennedy Class I were selected for this study. The remaining natural teeth were extended from the first premolar on one side to first premolar on the other side. One implant was placed in each first molar region bilaterally. The removable partial dentures were retained anteriorly by RPA clasp design and posteriorly either by ball attachment (group I) or by OT-equator attachment (group II). Alveolar bone height changes around the primary tooth abutments were radiographically evaluated using cone beam volumetric CT. Results: Regarding bone loss around the primary abutment teeth, ball attachment group (0.72±0.15) significantly (p value=0.008) showed less crestal bone resorption when compared to OT-equator attachment group (1.01±0.25). Conclusion: Within the limitation of this study and regarding the preservation of abutment teeth, the use of ball attachment may be the suitable choice for anchoring distally extended removable partial denture to dental implants with improved longevity of the natural tooth abutments.

Double-Arm Clasp with Anterior Placed Occlusal Rest Retained Mandibular Distal Extension Removable Partial Denture - Stress Analysis and Alveolar Bone Height Changes of Abutments.

Double-Arm Clasp with Anterior Placed Occlusal Rest Retained Mandibular Distal Extension Removable Partial Denture - Stress Analysis and Alveolar Bone Height Changes of Abutments.

Digital Versus Conventional Design For Mandibular Distal Extension RPD: A Study of Passivity of RPD Components and Principal Abutment Alveolar Bone Height Changes

Digital Versus Conventional Design For Mandibular Distal Extension RPD: A Study of Passivity of RPD Components and Principal Abutment Alveolar Bone Height Changes