Mechanical Versus Chemical Retention for Restoring Complex Restorations: What Is the Evidence?

Vaught, Randall L.

doi:10.1002/j.0022-0337.2007.71.10.tb04400.x

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Given the inherent risks of pin placement and retention issues with composite resin build-ups, an alternative method to build-ups would be desirable. The use of grooves, slots, boxes and adhesive bonding has been investigated with success in extensive restorations (14,15), and appear to be less of a risk to the pulp than pins (7). However, there is a lack of evidence supporting specific techniques to prevent early failures of resin build-ups on compromised vital posterior teeth (15,16).…”

Section: Introductionmentioning

confidence: 99%

Influence of a Retentive Shoulder Design to Prevent Early Failure of Three Core Build-Ups

et al. 2019

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This study evaluated the influence of a retentive shoulder design to prevent early failure of three resin composite build-ups on molars. Ninety-six intact extracted human maxillary third molars were assigned to two groups (n=48) based on occlusal, buccal cusps only and all cusps reduction. The groups were divided into two subgroups: pin retained and non-pin retained build-ups resulting in four groups (n=24), according the cusps reduction: pin retained/partial, pin retained/complete, non-pin retained/partial, non-pin retained/complete. Occlusal reduction was 3 mm with a semi-lunar retentive shoulder of 3 mm and an axial wall height of 1.5 mm. Groups were restored using a microhybrid, flowable or titanium reinforced resin composite. Modified self-curing acrylic resin provisional crowns were fabricated, cemented with non-eugenol temporary cement and thermal cycled. An instron machine applied tension to the provisional crowns parallel to the long axis of the tooth until dislodgement. A three-way analysis of variance was conducted on the influence of the variables on the retention of the core build-up. Ninety-three build-ups were retained under tensile load, while three core build-ups without pins were dislodged. Three-way analysis of variance showed no statistically significant difference between core build-ups using a retentive shoulder and pin retained core build-ups when tested under tensile load. With the advent of adhesive systems, increased surface area and retentive shoulder design can provide a retentive core foundation to prevent early failures of core build-ups during indirect restoration fabrication which will contribute to the longevity of final restorations.

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Section: Introductionmentioning

confidence: 99%

Influence of a Retentive Shoulder Design to Prevent Early Failure of Three Core Build-Ups

et al. 2019

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Restorative Dentistry

Caiafa

Visser

2018

Wiggs's Veterinary Dentistry

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A Study on Fracture Resistance of Class IV Cavities Treated with Pins

Boteva

Peycheva

Karayasheva

et al. 2014

Acta Medica Bulgarica

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Summary Тhе use of pins in restoration of large cavities with esthetic resin materials appear in the dental literature after 1970 and there are less than 20 publications, focused around restorations of class IV cavities. The aim of the present study is to test the role of pins in the fracture resistance in class IV restorations with resin materials. Materials and methods: 68 matured human upper and lower sound front teeth are included in the study. The groups are upper incisors, lower incisors, canines with or without pins. All cavities are filled with the same resin material, technology and Prime bond NT. Termocycling: 30 days in 30ºС, 100% humidity, 60 days in 100% humidity 2Х12 hours at 35ºС and 40ºС and 100 dry cycles, 20 seconds each in the following order - 45ºС ± 3ºС, room temperature, 5ºС, room temperature, two series, 50 each with two days between in Cultura incubator of Viva Dent 55ºС and ice. Machine for vertical load testing ZD 10/90, load in Newtons (N), from 20 N to 1275 N, speed 0.5 mm/ min, displacement from 0.1 to 1.2 mm. Type of fractures observed: adhesive, cohesive in dentine and in resin material, mixed. Results: The highest proportion of fractures observed was in front teeth with large cavities and with pins, low loading (493-503N). Front teeth with large cavities without pins have better resistance and lower proportion of fractures (488-526N). Canines are more resistible with pins and less without. Lowest resistance is found in lower front teeth when pins are present. Conclusion: In class IV restorations when tissue loses are less than 2/3 of the incisal ridge pins can decrease the fracture resistance of the teeth.

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Mechanical Versus Chemical Retention for Restoring Complex Restorations: What Is the Evidence?

Cited by 4 publications

References 11 publications

Influence of a Retentive Shoulder Design to Prevent Early Failure of Three Core Build-Ups

Influence of a Retentive Shoulder Design to Prevent Early Failure of Three Core Build-Ups

Restorative Dentistry

A Study on Fracture Resistance of Class IV Cavities Treated with Pins

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