Evaluation of resistance form of different preparation features on mandibular molars

Bajoghli, Farshad; Ghasemi, Ehsan; Sabouhi, M; Khodadadi, Reza; Mozhdeh, Behdarvand

doi:10.4103/0970-9290.116686

Cited by 4 publications

(1 citation statement)

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“…Auxiliary retentive methods are used for molars prepared as abutment for bridges, abutments with more than 20 o conversion, teeth less than 3 mm in length to anterior teeth and 4 mm in length to molars, or length-to-diameter ratio of ≤0.4 [30,[33], [34], [35], [36], [37], [38]].…”

Section: Introductionmentioning

confidence: 99%

An auxiliary factor for increasing the retention of short abutments

AlShaarani

Alaisami

Aljerf

et al. 2019

Heliyon

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BackgroundRetention is an essential factor in the sustainability of the prosthesis, especially for short abutment. Despite, the availability of several auxiliary applications, achieving a clinically good retention for cast crowns in prepared short teeth remains a major challenge for the practicing dentist.ObjectivesThis study tests a new method for applying frustum-shaped grooves on short prepared abutments and compares them with traditional setting grooves.MethodsForty-eight copper machine-milled short dies with 3.5 mm length and 12o conversion with a chamfer finish line of 0.7 mm were prepared to mimic short prepared molars and distributed into 4 groups. A control group with two opposing setting grooves and two groups with dual opposing frustums, one of which was prepared to receive two integrated metal protrusions inside the casting that fit the frustums. Frustums were prepared with Komet bur No. 807 with dimensions 0.9 mm at the base and 0.7 mm at the occlusal surface. A direct wax-up was carried out on all dies and all castings were cemented with zinc phosphate cement. A pull-off test was applied until separation. Data were analysed to compare the correlation of the four groups using one-way ANOVA and Bonferroni test (p ≤ 0.05).ResultsThe mean retentive values in Newton were as follows: the control group, 457.80; the setting grooves group, 461.07; the frustum group, 597.59; and the frustum group with the two metal protrusions, 919.80. The retention was increased by 65% in frustum group and doubled in frustum group with the metal protrusions.ConclusionsThe results showed a statistical significance in retention in the frustum groups with and without metal protrusion over the retention of the control and the setting grooves groups.

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Section: Introductionmentioning

confidence: 99%

An auxiliary factor for increasing the retention of short abutments

AlShaarani

Alaisami

Aljerf

et al. 2019

Heliyon

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Posterior restoration rotational torque associated with cuspal incline angulation: A proof of concept

Giugliano,

Kim,

Bowley

2023

The Journal of Prosthetic Dentistry

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Comparative Evaluation of Stress Acting on Abutment, Bone, and Connector of Different Designs of Acid-Etched Resin-Bonded Fixed Partial Dentures: Finite Element Analysis

Shaikh

Rai

Aldhuwayhi

et al. 2022

Front. Bioeng. Biotechnol.

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Background: Finite element analysis (FEA) is one of the best methods for evaluating the stress distribution of restorations, such as fixed partial dentures. The development of resin cement has transformed prosthesis bonding and retention properties. Resin-bonded fixed partial dentures (RBFPD) have been considered minimally invasive treatment options for the prosthetic rehabilitation of single missing teeth.Objectives: The aim of this study was to evaluate the stress load and distribution in four different designs of acid-etched RBFPDs using FEA.Materials and Methods: The designs included standard tooth preparation principles and additional features. The first premolar and first molar abutments replaced the missing second premolar. Designs 1, 2, 3, and 4 included (1) lingual wings and occlusal rests; (2) wings and proximal slices; (3) wings, rests, and grooves; and (4) wings, rests, grooves, and occlusal coverage. The prepared models were restored with RBFPDs. A load of 100 N was applied to the central groove of the pontic to simulate occlusal forces. The materials used in the models were considered to be isotropic, homogeneous, and linearly elastic. FEA was used to reveal stresses acting on the abutment, bone, and connector in all prosthesis designs.Results: The stresses transmitted to the abutment and bones were lowest for design 3, using wings, rests, and grooves. The stresses acting on the connector were the weakest in design 2. The stresses transmitted to the abutment and bone were highest in designs 1 and 4. The stresses transmitted to the connector were highest in design 3.Conclusion: The wings, rests, and grooves design is possibly the ideal and conservative tooth preparation design to receive a posterior RBFPD. This design transmits less stress to the abutments and less bone resorption in the FEA. It is most likely to be successful in the clinical provision and ensures the longevity of the prosthesis.

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Evaluation of resistance form of different preparation features on mandibular molars

Abstract: Within the limitation of this study, reducing the tapering of occlusocervival dimension is the most effective way in increasing resistance form, although, other features were also effective.

Cited by 4 publications

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An auxiliary factor for increasing the retention of short abutments

An auxiliary factor for increasing the retention of short abutments

Posterior restoration rotational torque associated with cuspal incline angulation: A proof of concept

Comparative Evaluation of Stress Acting on Abutment, Bone, and Connector of Different Designs of Acid-Etched Resin-Bonded Fixed Partial Dentures: Finite Element Analysis

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