Assessment of Various Post Systems' Fracture Resistance after Endodontic Treatment

Objectives

The study's objective is to evaluate the fracture resistance of a tooth that has had endodontic treatment and has been rebuilt using various post and core systems.

Materials and Methods

Thirty-six extracted premolar teeth of similar sizes were picked, and at random, they were separated into three groups: group A received stainless-steel posts, group B received zirconia fiber posts, and group C received glass fiber posts. Dual-cured resin cement was used to cement each post. The acrylic resin blocks have samples imbedded in them. Additionally, fracture loads were measured while a compressive force was given to the tooth at a crosshead speed of 1 mm/minute. The one-way analysis of variance F-test and post hoc Tukey's test were then used to analyze the results.

Results

When the mean values and standard deviation were compared, it was found that glass fiber posts had the highest fracture resistance, followed by posts made of zirconia fiber, while stainless-steel posts had the lowest fracture resistance.

Conclusion

When compared to zirconia posts and stainless-steel posts, glass fiber posts had the highest level of fracture resistance.

Intrabony defect management with a bone graft (hydroxyapatite and β-tricalcium phosphate) alone and in combination with a diode laser: A randomized control trial

Objectives

The current research was conducted to evaluate the use of a diode laser and a bone graft (hydroxyapatite [HA] + β-tricalcium phosphate [β-TCP]) in healing of intrabony defects.

Materials and Methods

In this split-mouth evaluation, 40 patients with bilateral intrabony defects were treated with, Group I (control) - bone graft alone (HA + β-TCP) and Group II, (test) - bone graft with a diode laser. The clinical and radiologic parameters of all patients, such as plaque index (PI), probing depth (PD), gingival index (GI), gingival recession (GR), and relative clinical attachment level (RCAL) were recorded at baseline, after 3 months and after 6 months.

Results

Reductions in PI, PD, GI, GR, and RCAL were found after 6 months. Furthermore, significant differences were displayed in the intra-group comparison while those of the inter-group evaluation (P > 0.05) were insignificant.

Conclusion

In both groups, considerable decrease in intrabony pockets was discovered; however, the inter-group comparison was insignificant in relation to GR and RCAL.

Evaluation of visual pedagogy teaching method for improving oral hygiene practice in children with Autism: An interventional study

BACKGROUND

Evaluation of visual pedagogy teaching method for improving oral hygiene practice in children with Autism: An interventional study: Visual pedagogy is a relatively newer approach to improve dental care in autistic children. The present study aimed to evaluate visual pedagogy in the practice of oral hygiene in autistic children.

MATERIALS AND METHODS

This interventional and prospective study was conducted in the Department of Paediatric and Preventive Dentistry. Required approval was obtained from Institutional Ethical Board. Written informed consent was obtained from parents/caregivers. The age range was 5-12 years which included 100 participants (40 males and 60 females). Improvement of oral hygiene was evaluated by recording the tooth brushing technique and ability to follow instructions as presented in the educational video shown on smartphones with Wi-Fi/mobile data. Inclusion criteria: (1) Accessibility and (2) Age range between 5 to 12 years. Exclusion criteria: (1) Non-cooperative children, (2) Children receiving medicines that influence oral health, and (3) Inability to follow-ups. Fones technique was used for brushing teeth in video recording demonstrating it in simple structured steps. Statistical analysis was performed using Chi-square and Independent t tests.

RESULTS

Statistically significant improvement was observed in oral hygiene (plaque index) after training patients with visual pedagogy.

CONCLUSION

In the present study, the use of visual pedagogy showed improvement in the oral hygiene scores of autistic children.

A Finite Element Analysis of Stress Allocation around Three Types of Abutment-Implant Interfaces

Objectives

This study examined the effects of stress distribution at three abutment-implant interfaces on various implant systems.

Materials and Methods

Group I: tri-channel internal connection (Nobel Biocare), Group II: 1.5-mm deep internal hex (BioHorizons Co. Birmingham, USA), and Group III: ADIN Touareg, to create computerized models of implants and mandibular modeling software, close fit WP, ANSYS Version 14.0 for finite element analysis (FEA), Hypermesh 12 for meshing and CATIA were used. A top-notch scanner was used to scan the implant. CATIA software created computerized models using all the aforementioned data. By applying bonded state on the abutment-implant borders and four various load conditions within the implant system, finite element method modeling was carried out. The computerized model was imported into the ANSYS program. To compare the groups, a statistical analysis was conducted.

Result

Through the use of three-dimensional FEA, the samples were assessed. Stress was found to be utmost in Group I, followed by Group III and Group II, at 80 N, 80 N with a 15° tilt, 250 N, and 250 N with a 15° tilt, and the divergence was statistically inconsequential.

Conclusion

The tri-channel internal connection displayed the highest stresses compared to the internal hex within the constraints of the current study.

Comparative Evaluation of Two Implant Designs Based on Bone Loss and Stability with Early Loading Method

The study evaluated the implant bone loss and stability of implant changes with diverse designs with early placement at eight weeks and eight months' time. The subjects for the current study had partial tooth loss in the posterior mandibular arch. A total of 30 samples were split into two groups of 15, one with a flared crest module and a buttress thread design, the other with a parallel crest module and a V-shaped thread design. Ostell assessed each subject's implant stability four times, at baseline, eight weeks, four months, and eight months. At intervals of eight weeks, four months, and eight months, intraoral periapical radiographs were examined using ImageJ software to measure crestal bone loss. When Group I and Group II's implant stability quotient (ISQ) values at baseline, eight weeks, four months, and eight months were compared; Group I's ISQ values at each of the four measured time periods were statistically significant. At eight weeks in Group I, the ISQ value was very considerable. At eight weeks, four months, and eight months, there was a statistically significant bone loss in Group II in comparison to Group I. At eight months, Group II's bone loss value was very considerable. In contrast to Group II implant designs, it was found that Group I implants demonstrated enhanced implant-less bone loss and stability.

Assessment of Static and Dynamic Load Tolerance of the Implant Mounts on its Particular Implant

Objectives

We compared the loads at which the implant holders from Astra Tech (AST) (AstraOsseoSpeed) and Osseotite Certain failed under static compression after experiencing fatigue, as well as the gap that resulted from dynamic loading between the implant-holder complexes.

Materials and Method

The ISO 14801 recommendation served as the foundation for the test protocol. Each brand's five implant-implant holder assemblies underwent dynamic loading. A load of 200 N was applied at a stress frequency of 12 Hz and a cycle rate of 5105. (Eden Prairie, MN, USA). Using scanning electron microscopy (S3700N, HITACHI, Japan), the gap (m) at the interface was measured post-fatigue. Static loading was then used to determine the highest load (N) after the point of failure. Controls included definitive abutment-implant complexes. Statistics were used to analyze the data.

Result

The Osseotite Certain group showed a slight trend toward greater resistance, but there was no diversity among the two implant holder groups (P 0.05). AST (AstraOsseoSpeed) implants had a larger interface gap, but the difference was not statistically significant.

Conclusion

With respect to greatest compression load or the interface gap following dynamic loading, there were no discernible differences between the two experimental groups.

Evaluation and Comparison of the Effectiveness of Physical Methods of Disinfection on Heat-Polymerized Polymethyl Methacrylate – An In-vitro Study

Introduction: The common relationship of Candida and the ample proof that acrylic resin dentures are related to denture stomatitis in the oral cavity, which can range from simple mucosal lesions to a fatal systemic form. The current study aims to assess and compare the efficacy of microwave irradiation and UV radiation in the disinfection of Candida albicans infection in heat-polymerized polymethyl methacrylate. Materials and Methods: A total of 90 specimens were prepared with heat-polymerized acrylic resin, out of which 30 were used for Microwave irradiation, and 30 were used for UV irradiation, and 30 were used for positive control. There were three groups: Group A (Positive Control group); Group B (Microwave irradiation); Group C (UV radiation). After preparing the samples they were chemically sterilized, then infected with C. Albicans, and again Group B is disinfected with Microwave irradiation, Group C is disinfected by UV light and Group A is kept as Positive control without disinfection. Turbidity was measured for each group after re-infection of every specimen in CFU/ml. Results: In the present study, the CFU/ml of Candida albicans in the control group was 2.97x107±0.6 x 107 (P= .000), for microwave irradiation, the mean value was 5.3±11.1 (P= .000), and for UV radiation, the mean value was 19.3±22.9 (P= .003). Conclusion: According to the results of the current study, microwave irradiation (6 minutes at 650W) is more effective than UV radiation (10 minutes each side at 254nm wavelength) of Candida albicans infection on the heat-polymerized acrylic resin in laboratory conditions.

Influence of Inter-Radicular Septal Bone Quantity in Primary Stability of Immediate Molar Implants with Different Length and Diameter Placed in Mandibular Region. A Cone-Beam Computed Tomography-Based Simulated Implant Study

AIM

The purpose of this in vitro study was to investigate the influence of length and width of implant on primary stability in immediate implants in mandibular first molar.

MATERIALS AND METHODS

The study was carried out on 40 cone-beam computed tomography scans selected with defined inclusion and exclusion criteria. According to the diameter and length of implants, they were divided into nine groups (G1 to G9). The virtual implants of different diameters and length were placed in mandibular first molar and measurements were done for peri-implant horizontal and vertical gap defect, peri-implant interradicular bone support and apical bone support for all the groups.

RESULTS

The study groups Diameter, (D-7 mm) showed least horizontal gap defect (Buccal-1.30 ± 0.56 mm, lingual-1.30 ± 0.56 mm, mesial-1.20 ± 0.51 mm, and distal-1.05 ± 0.59 mm) as compared to regular implant diameter (D-4.7) groups (Buccal-2.35 ± 0.483 mm, lingual-2.10 mm ± 0.44 mm, mesial-2.30 ± 0.64 mm, and distal-2.25 ± 0.43 mm). The unsupported Vertical implant gap defect at the coronal part of the socket was 2.80 mm ± 0.83 mm for all groups in both horizontal and vertical direction. The vertical peri-implant interradicular bone support showed increased bone support with increase in implant length (L). The buccal and lingual inter-radicular bone-support was least for Length (L-8.5 mm), moderate for L-11.5 mm, and highest for L-13.5 mm groups, respectively. The mesial inter-radicular bone support was least for G4G7, moderate for G1G2G5G8, and maximum for G3G6G9 groups. Similarly, the distal inter-radicular bone support was least for G4G7, moderate for G1G5G8, and maximum for G2G3G6G9 groups, respectively. There was no apical bone support in L-8.5 mm group as the tip of implant was 3.5-4 mm within the socket tip. Whereas, L-11.5 mm had decent (0.9-1 mm) and L-13.5 mm had Good (1.35-1.95 mm) apical bone support as the implant tip was beyond the socket tip.

CONCLUSION

All the groups showed good interradicular bone support on buccal and lingual surfaces. Regular width implants with longer length showed satisfactory interradicular bone support on mesial and distal surfaces. Longer implants showed good apical bone support in all the four surfaces and hence good apical primary stability expected.

Evaluating the efficacy of denture cleansing materials in removal of tea and turmeric stains: An in vitro study

CONTEXT

Extrinsic staining of acrylic resin dentures could be a major esthetic problem for denture wearers. Tea, coffee, cola, turmeric, and tobacco often cause extrinsic staining of dentures.

AIM

To evaluate the efficacy of various denture cleansing materials in the removal of tea and turmeric stains and to compare the efficacy of those denture cleansers with each other in the removal of tea and turmeric stains.

MATERIALS AND METHODS

Heat-cured acrylic resin specimens were stained using tea and turmeric solutions. The spectrophotometer was used to determine the reflectance values of the samples and to evaluate the efficacy of various denture cleansing materials in removal of tea and turmeric stains. Three denture cleansers, namely, sodium hypochlorite, Safe plus, and Clinsodent were used in the study. Water was used as a control.

STATISTICAL ANALYSIS USED

ANOVA test and post hoc Tukey's test were used to determine the statistical difference between the groups.

RESULT

A statistically significant difference was found (p ≤ 0.05) between the different denture cleansing materials used. Products containing sodium perborate along with trisodium phosphate had the highest stain removing capability.

CONCLUSION

It was found that all the denture cleansing materials used in the study were effective in removing tea and turmeric stains. Products containing sodium perborate along with trisodium phosphate had a comparatively greater stain removal capability than products containing sodium perborate along with sodium bicarbonate followed by products containing sodium hypochlorite followed by water (control).