International Scholarly Research Notices

Research Article

Preoperative Computed Tomography-Derived Bone Densities in Hounsfield Units at Implant Sites Acquired Primary Stability

Table 3

Bone classifications and bone densities in Hounsfield units (HU) observed in this study and previous studies for different jaw regions.


	Jaw region
	Anterior mandible			Anterior maxilla			Posterior mandible			Posterior maxilla

Bone classification
Lekholm and Zarb [1]	Q1			Q2/Q3						Q4
Misch [16] Trisi and Rao [17]	D1			D2/D3						D4
Norton and Gamble [3]	>850 HU			500–850 HU						0–500 HU
de Oliveira et al. [12]	>400 HU			200–400 HU						<200 HU
Rebaudi et al. [18]	Hard/dense (H)			Normal (N)						Soft (S)
Rebaudi et al. [18]	>1,000 HU			400 to 1,000 HU						<400 HU

Bone densities (HU)	n		(SD)	n		(SD)	n		(SD)	n		(SD)

This study	4	844	(242)	11	641	(173)	69	628	(209)	20	486	(199)
Norton and Gamble [3]	25	970	(269)	42	696	(244)	45	670	(249)	27	417	(227)
Turkyilmaz et al. [11]	62	912	(238)	31	751	(181)	37	698	(205)	28	467	(124)
Shapurian et al. [13]	42	559	(208)	45	517	(177)	78	321	(132)	54	333	(199)
Turkyilmaz et al. [14]	58	945	(207)	24	716	(190)	28	674	(227)	21	455	(122)
de Oliveria et al. [12]	6	383	(243)	6	370	(177)	34	306	(187)	29	256	(184)
Fuh et al. [15]	15	530	(161)	47	516	(132)	55	359	(150)	37	332	(136)

Lekholm and Zarb classification based on bone macrostructure: Q1, almost the entire jaw is comprised of homogenous compact bone; Q2, a thick layer of compact bone surrounds a core of dense trabecular bone; Q3, a thin layer of cortical bone surrounds a core of dense trabecular bone; Q4, a thin layer of cortical bone surrounds a core of low-density trabecular bone. Misch classification based on the clinical drilling resistance of the bone: D1, oak or maple wood; D2, white pine of spruce wood; D3, balsa wood; D4, styrofoam. n: number of implant sites.