FibreKor Dentist Prep Guide.4.qxd - Pentron Clinical

FibreKor ®
Metal-Free Bridge Tooth Preparation Guide
All FibreKor ® abutment preparations require a posterior box preparation or an anterior step preparation to provide adequate space and retention for FibreKor ® /Sculpture ® Plus restorations.
Maryland Type Abutment
Maryland Type
Proximal Step
(1.5–2.0mm wide x
2.0–3.0mm high x
1.0–2.0mm deep)
Lingual Groove
(0.5–1.0mm deep)
Lingual Reduction with
Shoulder Preparation
(0.6mm deep)
• Reduce lingual enamel surface by 0.6mm and provide
a shoulder preparation with rounded internal line angles
at the margin. A round end, tapered, fine grit bur with a
1.2mm maximum diameter, such as a Brasseler* 8846-
012, is recommended.
• Create a proximal step 1.5–2.0mm wide (labial/lingual),
2.0–3.0mm high (incisal/gingival) and 1.0–2.0mm deep
(mesial/distal). Locate the step at the edentulous connector
area. The height of the proximal step should approximate
the height at the connector area. Create a lingual groove by
continuing the lingual step at a depth of 0.5–1.0mm
to the linguo-proximal line angle opposite the edentulous
area. Ensure that there is a single, distinct path of insertion
for the step. A round end, tapered, fine grit bur with a
1.2mm maximum diameter, such as a Brasseler* 8846-012,
is recommended.
• Round and smooth all new line angles.
• USE CARE WHEN PREPARING THE STEP. AVOID VIOLATING
THE PULP.
Inlay/Onlay Abutment
Inlay
Occlusal Groove
(2.0–3.0mm wide x 2.0mm
deep)
Convex Walls with
10–15° Taper
Proximal Box
(2.0–3.0mm wide x 2.0mm
high x 2.0mm deep)
Onlay
Occlusal/Cuspal
Reduction
(1.0–2.0mm)
Occlusal Groove
(2.0–3.0mm wide x 2.0mm
deep)
Proximal Box
(2.0–3.0mm wide x 2.0mm
high x 2.0mm deep)
• Prepare an occlusal groove as for a traditional inlay:
2.0mm minimum occlusal reduction, 2.0–3.0mm wide
(buccal/lingual) with a 10–15° convex taper to the internal
walls. Round all line angles. Avoid placing margins in an
area of occlusal contact or making a narrow, thin isthmus
between large mesial and distal masses. A flat end, tapered,
course grit bur, such as a Brasseler* 6846-016, is recommended
for the rough out reduction. Finish with a fine grit
of the same bur.
• Prepare a short proximal box 2.0–3.0mm wide (buccal/
lingual), 2.0mm high (occlusal/gingival) and 2.0mm deep
(mesial/distal) at the connector area proximal to the pontic.
Locate the step at the edentulous connector area. The height
of the proximal step should approximate the height of the
connector area. Provide a minimum height of 1.5mm from
the gingival finish line for adjacent embrasures. A flat end,
tapered, fine grit bur, such as a Brasseler* 8846-012, is
recommended.
• Round and smooth all new line angles.
• USE CARE WHEN PREPARING THE STEP AND OCCLUSAL
GROOVE. AVOID VIOLATING THE PULP.
• Onlay abutment preparation is identical to the Inlay
preparation with an additional 1.0–2.0mm cuspal reduction
and a 1.5mm facial and lingual shoulder reduction with
rounded internal line angles.
Unidirectional Fiber Reinforced Composite
Tooth preparation designs courtesy of Martin A. Freilich, DDS and Jonathan C. Meiers,
DMD of the University of Connecticut School of Dental Medicine. For additional detail
refer to Fiber-Reinforced Composites in Clinical Dentistry, Freilich M.A., Meiers J.C., Duncan
J.P., Goldberg A.J. Quintessence Publishing Co, Inc., (2000) and to Freilich M.A., Meiers J.C.,
Duncan J.P, Goldberg A.J., Eckrote K.A. Clinical evaluation of fiber-reinforced fixed bridges.
JADA 2002; 133:1524-1534.
*Brasseler is a trademark of Brasseler USA, Inc.
1717 West Collins Ave., Orange, CA 92867 • For Technical Assistance, Call: 800.243.3100 / 203.303.2010
REF Z23PG
05J035_R03